-  - 0 
 
 
 
 
 
 
 
 
Low-power Radio -frequency Devices  
Technical Regulations  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
January , 2018 
 Telecom Technical Regulations  
Test Requirements  Low Power 0002 (LP0002)  
10 January , 2018 revised  
 
 
-  - 1 
Contents  
Preface  
1 TERMINOLOGY  ................................ ................................ ................................ ................................  3 
2 GENERAL REQUIREMENTS  ................................ ................................ ................................ ............  5 
3 CONFORM ANCE SPECIFICATIONS (BY FREQUENCY RANGES ) ................................ ..................  8 
3.1 Frequency bands:1.705 MHz - 37 MHz.  ................................ ................................ ..........................  8 
3.2 Operation within the band 13.553 MHz 〜13.567 MHz ................................ ................................ ..... 8 
3.3 Operation within the band: 26.957 MHz 〜27.283 MHz  ................................ ................................ .... 8 
3.4 Operation within the band: 40.66 MHz 〜40.70 MHz and above 70 MHz  ................................ ..........  9 
3.5 Operation within the b and: 49.82 MHz 〜49.90MHz  ................................ ................................ ....... 11 
3.6 Operation within the band 72.0 MHz 〜73.0 MHz  ................................ ................................ ...........  11 
3.7 Operation within the band: 88.0 MHz 〜108.0MHz  ................................ ................................ .........  12 
3.8 Operation within the bands: 174. 0 MHz〜216.0 MHz, 584 MHz 〜608 MHz  ................................ ... 12 
3.9 Operation within the bands 216 MHz 〜217 MHz  ................................ ................................ ...........  12 
3.10 Operation within the bands 2400 MHz~2483.5 MHz, 5725 MHz~5875 MHz, 24.00 GHz~24.25 
GHz 13 
3.11 Operation within the bands 2435 MHz~2465 MHz, 5785 MHz~5815 MHz, 10500 MHz~10550 
MHz, 24075 MHz~24175 MHz, 24250 MHz~26650 MHz  ................................ ...............................  16 
3.12 Operation within the bands 2.9 G Hz~3.26 GHz, 3.267 GHz~ 3.332 GHz, 3.339  GHz~ 3.3458 GHz, 
3.358 GHz~ 3.6 GHz ................................ ................................ ................................ ......................  18 
3.13 Operation within the band 57 GHz~66 GHz  ................................ ................................ ...................  19 
3.14 Operation within the band  76 GHz~77 GHz  ................................ ................................ ...................  20 
3.15 Operation within the band 7 7 GHz~81 GHz  ................................ ................................ ...................  21 
4 CONFORMANCE SPECIFIC ATION OF SPECIAL DEV ICES  ................................ ...........................  23 
4.1 Tunnel radio systems: An intentional radiator utilized as a communication transceiver by the 
people work in the tunnel.  ................................ ................................ ................................ .............  23 
4.2 Cable locating equipment: An intentional radiator used intermittently by trained operators to 
locate buried cables, lines, pipes and similar structures or elements. Operation entails coupling a 
radio frequency signal onto the  cable, pipe, etc. and using a receiver to detect the location of that 
structure or element.  ................................ ................................ ................................ .....................  23 
4.3 Radio control devices:  including the remote controlled devices for model toys, industrial 
purposes and also the radio data tra nsceivers.  ................................ ................................ ..............  23 
4.4 Citizens Band Radio Service (CBRS)  ................................ ................................ ............................  27 
4.5 Family Radio Service (FRS)  ................................ ................................ ................................ ..........  28 
4.6 Low-Power Wireless Microphone and Wireless Earphone: A low power wireles s microphone is 
used for transmission of voice or music by radio waves to remote receiving equipments.  ..............  29 
4.7 Unlicensed National Information Infrastructure: Use wideband digital modulation techniques and 
provide a wide array of high data rate mobile and fixed communications for individuals, 
businesses, and organizations.  ................................ ................................ ................................ ..... 32 
4.8 Radio Frequency Identification (RFID), radio beacon in seaside, and other IoT devices.  ................  37 
4.9 Auto, motorcycle theft -proof remote control  ................................ ................................ ...................  38 
4.10 Assistive vision disabled communication devices  ................................ ................................ ..........  39  
-  - 24.11 Medical Device Radio communication Service (MedRadio): is a medical service system 
specifically for transmitting data in support of diagnostic or therapeutic functions between an 
external programmer/control transceiver and an active medical implant or body -worn transceiver 
placed in the human body.  ................................ ................................ ................................ ............  39 
4.12 Ultra-wideband Devices:  ................................ ................................ ................................ ...............  43 
5 INSPECTION RULES  ................................ ................................ ................................ ......................  47 
Appendix   Measurement of low power radio frequency devices  ................................ ................................ . 53 
Appendix I  Measurement of international radiators ................................ ................................ ...................  53 
Appendix II   Measurement Guidelines for Direct Sequence Spread Spectrum  ................................ ...........  60 
Appendix III   Measurement Guidelines for Frequency Hopping Spread Spectrum Systems  .......................  62  
-  - 3 
 
 
Low-power Radio -frequency Devices Technical Regulations  
Preface  
This regulation is formulated based on Section 1 of Article 50 of  the Telecommunications Act . It consists 
of five chapters:  Chapter 1 defines related terminology ; Chapter 2 stipulates  general r equirements for the 
operating bands, radiated field intensity, performances and manufacture, installation, possession, i mport and 
sales  of equipment . Low -power radio -frequency devices in this chapter are unrestricted unless  otherwise 
stipulated by other  laws codes ; Chapter 3 and Chapter 4 outline specifications for conformity. As such these 
two chapters  place  limitation s on the frequency bands and radiated field intensity and correspond to the  
relevant  frequency bands and type s of device. Those not stipulat ed in these two Chapters shall comply with 
the provisions of Chapter 2 ; Chapter 5 covers test requirements of type approvals on low -power 
radio -frequency devices.  
1 Terminology  
1.1 Radio frequency (RF) energy: Electromagnetic energy at any frequency in the radio  spectrum , 
locat ed in the frequency range between 9 kHz and 300  GHz.  
1.2 Carrier: Radio frequency energy generated by Low power radio frequency devices before 
modulation. In other words, the carrier wave without be ing modulated.  
1.3 Spurious emissions:  Emissions o n a frequency (or frequencies) which are outside the necessary 
bandwidth and the level of which may be reduced without affecting the corresponding transmission 
of information. Spurious emissions include harmonic emissions, parasitic emissions, 
intermodulat ion products and frequency conversion products, but exclude out -of-band emissions.  
1.4 Out-of-band emissions: Due to modulation process, emissions on a frequency (or frequencies) 
which are outside the necessary bandwidth. The spurious emission is exclusive.  
1.5 Unwanted emissions:  Encompass spurious emissions and out -of-band emissions.  
1.6 Necessary bandwidth: Under regulations, the bandwidth required to ensure necessary speed and 
quality of transmitted information.  
1.7 Instantaneous frequency: The time rate of change in p hase in radians divided by 2π ; the unit is Hz.  
1.8 Peak frequency deviation: Half of the range  between the maximum and minimum values of the 
instantaneous frequency.  
1.9 Harmful interference: Any emission, radiation or induction that endangers the functioning of a  radio 
navigation service or of other safety services or seriously degrades, obstructs or repeatedly 
interrupts a radio communications service operation served by legal radio communication business 
enterprise.  
1.10 Damped waves:  The strength of the radio wave i ncreases rapidly and then decreases gradually 
until nil.  
1.11 Effective Radiated Power ( ERP): The product of the power supplied to the antenna and its gain 
relative to a half -wave dipole in a given direction.  Telecom Technical Regulations  
Test Requirements  
Low Power 0002 (LP0002)  
10 January, 20 18 revised  
  
-  - 41.12   Equivalent isotropically radiated power  (EIRP ): The product of the power supplied to the antenna 
and the antenna  gain.The antenna gain is expressed relative to an ideal (theoretical) isotropic 
antenna . 
1.13 Maximum C onducted Output Power :The total transmitting power delivered to all antennas and  
antenna elements averaged across all symbols in the signaling alphabet when the transmitter is 
operating at its maximum power control level. The average must not include any time intervals 
during which the transmitter is off or is transmitting at a reduce d power level. If multiple modes of 
operation are possible, the maximum conducted output power is the highest total transmit power 
occurring in any mode.  
  
-  - 52 General requirements  
2.1 The low -power radio -frequency devices shall be self -contained with no external or readily accessible 
controls which may be adjusted to permit operation in a manner inconsistent with the provisions.  
2.2 Antenna requirement: Low -power radio frequency transmitter or transceiver (receiver ) shall utilize a 
permanently, semi -permanently attache d antenna or uses a unique coupling of the antenna and at 
any cable connector between the transmitter and the antenna. The antenna shall be  an 
omni -directional type. The manufacturer may design the unit so that the user can replace a broken 
antenna, but th e use of a standard antenna jack or electrical connector or other than authorized is 
prohibited. Such standard connectors are for example: BNC, F type, N type, M type, UG type, RCA, 
SMA, SMB, and other standard type antenna connectors.  
2.3 For Low -power radio -frequency devices that is designed to be connected to the public utility (AC) 
power line, the radio frequency voltage that is conducted back onto the AC power line on any 
frequency or frequencies, within the band 150 kHz to 30 MHz,  shall be less than or eq ual the limits in 
the following table, as measured using a 50 [mu]H/50 ohms line impedance stabilization network 
(LISN). The lower limit applies at the boundary between the frequency ranges.  
Frequency of emission 
(MHz)  Conducted limit (dBuV)  
Quasi -peak  Average  
0.15-0.5 66 – 56(Note) 56 – 46(Note) 
0.5-5 56 46 
5-30 60 50 
Note:  Decreases with the logarithm of the frequency.  
2.4 Low-power radio -frequency devices that produce damped waves are prohibited.  
2.5 Low-power radio -frequency devices must not be altered by  changing the frequency, enhancing 
emission power, adding an external antenna, and modification of original design characteristic or 
function.  
2.6 The operation of the low -power radio -frequency devices shall be  subject to the conditions that no 
harmful interfe rence is caused. The user must cease operating the device immediately should 
harmful interference be caused and shall not resume until the condition causing the harmful 
interference has been corrected.  
Moreover, the interference must be accepted that  it may be caused by the operation of authorised 
communications, or ISM equipment.  
2.7 Additional regulations shall apply except for this standard.  The fundamental frequency of any 
low-power radio -frequency devices shall be restricted in any of the operation bands l isted below; 
spurious emissions shall be  permitted in any of frequency band listed below and shall meet the field 
strength requirement of 2.8:  
Frequency (MHz)  Frequency (MHz)  Frequency (MHz)  
0.090  〜  0.110  322.00  〜  335.40  3500.0  〜  4400.0  
0.490  〜  0.510 399.90  〜  410.00  4500.0  〜  5250.0  
2.172  〜  2.198  485.00  〜  510.00  5350.0  〜  5460.0  
3.013  〜  3.033  608.00  〜  614.00  7250.0  〜  7750.0  
4.115  〜  4.198  703.00  〜  748.00 8025.0  〜  8500.0  
5.670  〜  5.690  758.00  〜  803.00 9000.0  〜  9200.0  
6.200  〜  6.300  825.00  〜  915.00  9300.0  〜  9500.0  
8.230  〜  8.400  930.00  〜  1240.0  10600  〜  12700  
12.265  〜  12.600  1300.0  〜  1427.0  13250  〜  13400  
13.340  〜  13.430  1435.0  〜  1626.5  14470  〜  14500  
14.965  〜  15.020  1660.0  〜  1785.0 15350  〜  16200  
-  - 616.700  〜  16.755  1805.0  〜  1880.0 17700  〜  21400  
19.965  〜  20.020  1885 .0  〜  1900.0 22010  〜  23120  
25.500  〜  25.700  1905 .0  〜  1985.0 23600  〜  24000  
37.475  〜  38.275  2010.0  〜  2025.0 31200  〜  31800  
73.500  〜  75.400  2110.0  〜  2170.0 36430  〜  36500  
108.00  〜  138.00  2200.0  〜  2300.0  38600  +  
149.90  〜  150.05  2310.0  〜  2390.0   
156.70  〜  156.90  2483.5  〜  2900.0  
162.01  〜  167.17  3260.0  〜  3267.0   
167.72  〜  173.20  3332.0  〜  3339.0   
240.00  〜  285.00  3345.8  〜  3358.0 ) 
 
2.8 Additional regulations shall apply except for this standard , the emissions from the low -power 
radio -frequency devices shall  be less than or equal  the field strength levels specified in the following 
table and the level of any unwanted emissions shall not exceed  the level of the fundamental emission.  
The tighter limit applies at the band edges.  
 
Frequency (MHz)  Field strength (micro -volts/meter)  Measurement 
distance (meters)  
0.009 - 0.490 (included)  2,400/Freq.(kHz)  300 
0.490 (excluded) - 1.705 
(included)  24,00 0/Freq.(kHz)  30 
1.705 (excluded) - 30 (excluded)  30 30 
30 (included) - 88 (included)  100 3 
88 (excluded) -216 (included)  150 3 
216 (excluded) -960 (included)  200 3 
above 960 (excluded)  500 3 
 
2.9 The field strength radio frequency 9 -90 kHz, 110 -490 kHz a nd 1000 MHz above stipulated in the 
above table shall be measured according to an average detector and comply with Section 5.15.2, 
while others shall be measured using a CISPR quasi -peak detector. Those not specified above shall 
comply with Section 5.5 and  the frequency bands measurement of radiated emission shall accord 
with Section 5.1 4. 
2.10 The low -power radio -frequency devices on the market must be accompanied with operation manual 
or instructions. Sample copies for  of both should be s ubmitted  for review to gether with the device 
approval application (manual in draft form shall be deemed acceptable  temporarily but final copies 
must also be submitted  thereafters .) The operation manual shall contain all the necessary information 
for proper installation and oper ation of the device by the users. The necessary contents are:  
2.10.1  The control, adjust, and on/off operation of the device to does not violate Administrative 
Regulations  on Low Power Radio Waves Radiated Devices.  
2.10.2  Warnings against any adjustments  being made  to the device that may violate regulations. The 
manual sh all suggest that all these adjustments be carried out or be monitored by  a specialist who has 
expertise on radio frequency devices maintenance.  
2.10.3  Warnings against any replacements o f components (ICs, transistors, etc) that may lead to the 
violation to the regulations.  
2.10.4  Articles 12 and 14 of Administrative Regulations on Low Power Radio Waves Radiated Devices . 
2.10.5  Applications for use in aviation model or similar remote con trol shall conform to the regulations of 
the business authority and the aviation model.  
  
-  - 72.11 If the transmitter and receiver of the low -power radio -frequency device are sold in one set, the 
corresponding type approval review documents sh all be submitted ; otherwise the transmitter and 
receiver should be applied for approval together. The receiver radiated field strength must not exce ed 
the emission specified in Section 2.8 and the receiver shall not receive, demodulate frequency listed 
in Section 2.7.  
2.12 The characteristic of  low-power radio -frequency devices  shall be  test in accordance with this 
regulation ; those not stipulated shall be tested per CNS standards. If  in-country standards are not 
found, they shall be tested based on IEEE, ANSI ,ETSI EN standa rds and FCC 47 CFR P ART 
2,KDB,ARIB STD -T67 associated test requirement s.  
-  - 83 Conformance specifications (by frequency ranges)  
3.1 Frequency bands: 1.705  MHz - 37 MHz.  
3.1.1  Type of device: any radiated device.  
3.1.1.1  Frequency bands: 1.705 MHz - 10 MHz  
3.1.1.2  Fundamental emission:  
(1)  If the bandwidth of the emission is less than 10% of the center frequency, the field strength shall 
be less than or equal  to 15 microvolts/meter or (the bandwidth of the device in kHz) divided by (the 
center frequency of the device in MHz) microvolts/meter at a distance of 30 meters, whichever is 
the higher level.  
(2)  If the bandwidth of the emission is equal or greater than 10% of the center frequency, the field 
strength of any emission within the band 1.705 -10.0 MHz shall  be less than or equal  to 100 
microvol ts/meter at a distance of 30 meters.  
(3)  The bandwidth  of the preceding two paragraphs indicates the width between two measurement 
signal points, which are the upper and lower sides of the central frequency of modulation carrier 
wave, relative to lower 6 dB a t the maximum power of a modulated carrier.  
(4)  The central  frequency must not be within the band listed in 2.7.  
3.1.1.3  Unwanted emission: The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2.8.  
3.1.1.4  Field strength shall be based on measurement instrumentation employing an average 
detector and must meet the peak emissions of Section 5.15.2.  
3.1.2  Type  of device: Swept frequency field disturbance sensors  
3.1.2.1  Frequency bands: 1.705 MHz - 37 MHz  
3.1.2.2  The field strength of fundamental emission and unwanted emission shall complly with 2.8. 
Field strength shall be based on measurement instrumentation employing an average detector 
and must meet the peak emissions of Section 5.15.2.  
3.2 Operation within the band 13.553  MHz〜13.567 MHz 
3.2.1  Type of de vice: any radiated device.  
3.2.1.1  Fundamental emission: The field strength of any emissions within this band shall be less than 
or equal  15848  microvolts/meter  at 30 meters.  
3.2.1.2  Unwanted emission: The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2.8.  
3.2.1.3  The frequency tolerance: The frequency tolerance of the carrier shall be ±0.01%. This 
frequency tolerance shall be maintained for a temperature variation of -20 to +50°C at normal 
supply voltage, and for a variation  in the primary supply voltage within ±15% of the rated supply 
voltage at a temperature of 20°C. For battery operated equipment, the equipment tests shall be 
performed using  a new battery  and shall conform to  the requirement s set forth in  Section 5.18.  
3.3 Operation within the band: 26.9 57 MHz〜27.28 3 MHz 
3.3.1  Type of device: any radiated device.  
3.3.1.1  Fundamental emission: The field strength of any emissions within this band shall  be less than 
or equal  10 mV/meter at 3 meters (measurement instrumentation employing an average detector) . 
The provision s in section 5.1 5.2 for limiting peak emissions  shall apply.   
-  - 93.3.1.2  Unwanted emission: The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2.8.  
3.4 Operation within the band: 40.66  MHz〜40.70 MHz and above 70 MHz  
3.4.1  Type of device: perimeter protection systems  
3.4.1.1  Note:  A perimeter protection systems employs RF emissions to sense field disturbance, and 
to detect movement within the protected area.  
3.4.1.2  Operation within the band: 40.66  MHz〜40.70 MHz  
3.4.1.3  Fundamental emission: (measur ement instrumentation employing an average detector)  
(1) Perimeter protection system: The field strength of any emissions within this band shall be less 
than or equal  to 500 microvolts/meter at 3 meters . 
(2) The provisions stipulated  Section 5.1 5.2 for limiting pe ak emissions  shall apply.  
3.4.1.4  Unwanted emission: The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2.8.  
3.4.1.5  The frequency tolerance: The frequency tolerance of the carrier shall be ±0.01%. This 
frequency tole rance shall be maintained for a temperature variation of -20 to +50°C at normal 
supply voltage, and for a variation in the primary supply voltage within ±15% of the rated supply 
voltage at a temperature of 20°C. For battery operated equipment, the equipmen t tests shall be 
performed using a new battery  and shall conform to  the requirement s set forth in  Section 5.1 8. 
3.4.2  Type of device: intermittent or periodic devices.  
3.4.2.1  Operation within the bands 40.66  MHz〜40.70MHz and use spectra in Section 2.7 and 
frequency greater than 70 MHz.  
3.4.2.2  The bandwidth of the emission shall be no wider than 0.25% of the center frequency for 
devices operating above 70MHz and below 900MHz. For devices operating above 900MHz, the 
emiss ion shall be no wider than 0.5% of the center frequency. The bandwidth indicates the upper 
and lower sides of the central frequency of modulation carrier, relative to lower 20 dB at the 
maximum power of a modulated carrier.  
3.4.2.3  For devices operating within the frequency band 40.66  MHz〜40.70 MHz, the bandwidth of 
the emission shall be confined within the band edges and the frequency tolerance of the carrier 
shall be 0.01%. This frequency tolerance shall be maintained for a temperature variation of -20 to 
+50 C at normal supply voltage , and for a variation in the primary supply voltage within 15% of 
the rated supply voltage at a temperature of 20 C. For battery operated equipment, the equipment 
tests shall be performed using  a new battery  and shall conform to the requirement s set fort h in 
Section 5.1 8. 
3.4.2.4  The operation limits of the device . 
(1) The device is restricted to the transmission of a control signal such as those used with alarm 
systems, door openers, remote switches, etc. Continuous transmissions, such as Radio 
control of toys, vide o, or data are not permitted  and shall conform to the following conditions:  
(A) For operation in 314  MHz〜316 MHz and 433  MHz〜435MHz: A manually operated 
transmitter shall employ a switch that will automatically deactivate the transmitter within 
not more than 5  seconds  after being released.  
(B) For operation in frequencies other than ( A): A manually operated transmitter shall 
employ a switch that will automatically deactivate the transmitter within not mor e than 5 
seconds of being selected . 
(C) The device can automatica lly transmit, and shall not  transmit  less than five seconds  
each time.  
(D) Periodic transmissions at regular predetermined intervals are not permitted. However, 
polling or supervision transmissions used in security or safety applications shall be 
allowed if t he total periodic rate of transmission is less than or equal to two seconds 
duration per hour for each transmitter.   
-  - 10(2) Except for (1), the device shall have an  automatic control mechanism with each transmission 
time is shorter than 1 second, and stop duration  of a transmission period is longer than 10 
seconds and is not shorter than transmission time multiplied by 30.  
3.4.2.5  Field strength of fundamental emissions:  
(1) In addition to the provisions of Section 2.7, the field strength of emissions from intentional 
radiator s at 3 meters  operated under this section 3.4.2.4(1)  shall not exceed limits in the table 
below (measurement instrumentation employing an average detector, CISPR quasi -peak 
detector is accepted as well): The tighter limit applies at the band edges.  
 
Fundam ental frequency (MHz)  Field strength of fundamental 
emissions (microvolts/meter)  Unwanted emissions 
(microvolts/meter)  
40.66〜40.70  2250  225 
70〜130 (included)  1250  125 
130 (excluded) 〜174 (included)  1250〜3750 (Note 1, 2)  125〜375 (Note 1, 2)  
174 (excluded) 〜260 (included)  3750  375 
260 (excluded) 〜470 (included)  3750〜12500 (Note 1, 2)  375〜1250 (Note 1, 2)  
above 470 (excluded)  12500  1250  
Note:  1. With linear interpolations, the formulas for calculating the maximum permitted fundamental 
field strengths shall be  as follows:  
(1.1)   130 MHz〜174MHz, μV/m at 3 meters = 56.81818 x (frequency bands, MHz) 
-6136.3636  
(1.2)   260 MHz〜470MHz, μV/m at 3 meter s = 41.6667 x (frequency bands, MHz) 
-7083.3333  
2. The maximum permitted unwanted emission level shall be  20dB below the maximum 
permitted fundamental level, or meets the requirement of Section 2.8, whichever is less. If 
the field strength is based on meas urement instrumentation employing an average detector, 
it shall comply with  the peak emissions set forth in  Section 5.1 5.2 
(2)  In addition to the provisions of Section 2.7, the field strength of emissions from intentional 
radiators at 3 meters operated under this section 3.4.2.4(2)  shall not exceed limits in the table 
below (measurement instrumentation employing an average detector, CISPR quasi -peak 
instrumentation is accepted as well): The tighter limit applies at the band edges.  
Fundamental frequency (MHz)  Field strength of fundamental 
emissions (microvolts/meter)  Unwanted emissions 
(microvolts/meter)  
40.66〜40.70  1000  100 
70〜130 (included)  500 50 
130 (excluded) 〜174 (included)  500〜1500 (Note 1, 2)  50〜150 (Note 1, 2)  
174 (excluded) 〜260 (included)  1500  150 
260 (excluded) 〜470 (included)  1500〜5000 (Note 1, 2)  150〜500 (Note 1, 2)  
above 470 (excluded)  5000  500 
Note: 1. With linear interpolations, the formulas for calculating the maximum permitted fundamental 
field strengths shall be  as follows:  
(1.1) 130 MHz〜174MHz, μV/m at 3 meters = 22.72727 x (frequency bands, MHz) -2454.545  
(1.2) 260 MHz〜470MHz, μV/m at 3 meters = 16.6667  x (frequency bands, MHz) -2833.3333  
2. The maximum permitted unwanted emission level is 20dB below the maximum permitted 
fundamental level, or meets the requirement of Section 2.8, whichever is less. If the field 
strength is based on measurement instrumen tation employing an average detector, it shall 
comply with  the peak emissions set forth in  Section 5.1 5.2 
  
-  - 113.4.3  Type of device: any radiated devices except for those described in Section 3.4.1 and 3.4.2.  
3.4.3.1  Operation within the band: 40.66  MHz〜40.70 MHz  
3.4.3.2  Fundamental emission: The field strength of any emissions within this band shall be less than 
or equal  1 millivolts/meter at 3 meters.  
3.4.3.3  Unwanted emission: The field strength of unwanted emissions shall not exceed the ge neral 
radiated emission  limits in Section 2.8.  
3.4.3.4  Frequency tolerance: The frequency tolerance of the carrier shall be ±0.01%. This frequency 
tolerance shall be maintained for a temperature variation of -20 to +50°C at normal supply voltage, 
and for a variation in the primary suppl y voltage within ±15% of the rated supply voltage at a 
temperature of 20°C. For battery operated equipment, the equipment tests shall be performed 
using  a new battery  and shall comply to the requirement s set forth in  Section 5.1 8. 
3.5 Operation within the band : 49.82  MHz〜49.90MHz  
3.5.1  Type of device: any radiated device s except for th e Wireless  Phone . 
3.5.1.1  Fundamental emission: The field strength of any emission within this band shall be less than 
or equal  to 10 millivolts/meter at 3 meters (measurement instrumentation e mploying an average 
detector). The provisions in Section 5.1 5.2 for limiting peak emissions shall apply.  
3.5.1.2  Unwanted emission:  
(1)  The field strength of any emissions appearing in the bands 49.81  MHz〜49.82MHz and 
49.90  MHz〜49.91MHz shall be attenuated at least 26 dB below the level of the 
unmodulated carrier or to the general limits in Section 2.8 ; whichever is lower shall be the 
adopted regulation.  
(2)  The field strength of any emissions below 49 .81 MHz (exclusive) or above 49.91  MHz 
(exclusive)  shall not exceed the g eneral radiated emission limits in Section 2.8.  
(3)  Measure the field strength (employing an average detector function) at 3 meters from the 
device. The field strength greater than 20 μV/m shall be recorded in the test report.  
3.5.1.3  For a home -built intentional radiator, the following standards may be employed:  
(1)  The RF carrier and modulation products shall be maintained within the band 49.82  MHz〜
49.90  MHz.  
(2)  The total input power to the device m easured at the battery or the power line terminals shall  
be less than or equal  to 100 mW under any condition of modulation.  
(3)  The antenna shall be a single element, 1 meter or less in length, permanently mounted on 
the enclosure containing the device.  
(4)  Emissi ons outside of this band shall be attenuated at least 20  dB below the level of the 
unmodulated carrier.  
3.6 Operation within the band 72.0  MHz〜73.0 MHz 
3.6.1  Type of device:  Auditory assistance device. An intentional radiator used to provide auditory 
assistance to a handicapped person or persons. Such a device may be used for auricular 
training in an education institution, for auditory assistance at p laces of public gatherings, such 
as a theater, auditorium or meeting.  
3.6.1.1  Fundamental emission: The field strength of any emission within this band shall be less than 
or equal  80 millivolts/meter at 3 meters (measurement instrumentation employing an average 
detector). The provisions in Section 5.1 5.2 for limiting peak emissions shall apply.  
3.6.1.2  Bandwidth: Emissions from the intentional radiator shall be confined within a band 200  kHz 
wide centered on the frequency bands. The 200  kHz band shall lie wholly within the  frequency 
range of 72.0  MHz〜73.0MHz.  
3.6.1.3  The field strength of any emissions radiated on any frequency outside of the specified 200  
kHz band  shall conform to 2.8 (employing an average detector function), and must conform to the 
peak in Section 5.15.2.   
-  - 123.7 Operati on within the band: 88.0  MHz〜108.0MHz  
3.7.1  Type of device: any radiated device.  
3.7.1.1  Fundamental emission: The field strength of fundamental emissions shall be less than or 
equal  250 microvolts/meter at 3 meters (measurement instrumentation employing an average 
detector). The provisions in Section 5.15.2. for limiting peak emissions  shall apply.  
3.7.1.2  Emissions from the intentional radiator shall be confined within a 200  kHz band, which shall 
lie wholly within the frequency range of 88.0  MHz〜108.0MHz.  
3.7.1.3  The field strength of  any emissions radiated on any frequency outside of the specified 200  
kHz band shall not exceed the general radiated emission limits in Section 2.8.  
3.8 Operation within the bands: 174.0  MHz〜216.0 MHz, 584  MHz〜608 MHz 
3.8.1  Type of device: Operation under the provis ions of this Section is restricted to biomedical 
telemetry devices which are the intentional radiators used to transmit measurements of either 
human or animal biomedical phenomena to a receiver.  
3.8.1.1  Frequency bands: 174  MHz〜216 MHz.  
3.8.1.2  The field strength of any e missions radiated within the specified 200  kHz band shall be less 
than or equal  to 1500 microvolts/meter at 3 meters.  
3.8.1.3  Outside band emission: The field strength of any emissions within this band shall be less than 
or equal  150 millivolts/meter at 3 meters.  
3.8.1.4  Bandwidth: Emissions from the intentional radiator shall be confined within a 200  kHz band, 
which shall lie wholly within the frequency range of 174  MHz〜216 MHz.  
3.8.1.5  Above measurement s shall be taken  employing an average detector. The provisions in 
Section 5.1 5.2 for limiting peak emissions shall apply.  
3.8.2  Type of device: Operation under the provisions of this Section is restricted to biomedical 
telemetry device s which are the intentional radiators used to transmit measurements of either 
human or animal biomedical phenomena to a receiver. Such device is restricted to  be operate d 
only in hospitals and shall not extend to mobile vehicles, such as ambulances, even i f those 
vehicles are associated with a health care facility.  
3.8.2.1  Frequency bands: 174  MHz〜216 MHz, 584  MHz〜608 MHz.  
3.8.2.2  Fundamental emission: The field strength of emissions radiated s hall be less than or equal  to 
50 millivolts/meter at 3 meters (employing an average detector).  
3.8.2.3  Outside band emission: The field strength of outside the specified ban d shall not exceed the 
general radiated emission limits set forth in  Section 2.8.  
3.8.2.4  Required to be at  least 5.5  km away from the 64  dBuV/m fi eld strength contour of  
broadcasting, TV broadcast station or an associated TV booster station  and a t least 3.1  km a way 
from the 74  dBuV/m field strength contour of a low power TV or a TV translator station.  
3.8.2.5  The device s hall be installed by  a qualified  person. Prior to  installation, evaluat ion of  the radio 
environment and the user retain ed assessment record s shall be ta ken. Biomedical telemetry 
devices must not cause harmful interference to licensed TV broadcast stations or to other 
authorized radio services. If harmful interference occurs, the interference must either be corrected  
or the device must immediately cease op eration on the occupied frequency.  
3.9 Operation within the bands 216  MHz〜217 MHz 
3.9.1  Type of device : The purpose is for voice or data transmission for auditory assistance 
communication (such as hearing aid devices, hearing assistant devices for handicapped 
individuals, language translation assistance equipments, assistant list ening devices(except for 
assistant microphones), and assistant guiding devices or health care related communications 
for the patient ;however,  two-way communications is prohibited.  
3.9.1.1  Transmitting channels:  There are three types of transmission Channels.  
(1)  Stand ard Channel: channel number from n=1 to n=40, the center frequencies are 216.0125 
+ (n-1) x 0.025  MHz with a channel bandwidth of 25  kHz and the frequency tolerance is 0.005  %.  
-  - 13(2)  Wide -band Channel: channel number from n=41 to n=60, the center frequencies are  
216.025 + (n -41) x 0.05  MHz with a channel bandwidth of 50  kHz and the frequency stability is 
0.005  %. 
(3)  Narrow -band Channel: channel number from n=61 to n=260, the center frequencies are 
216.0 025 + (n -61) x 0.005  MHz with a channel bandwidth of 5  kHz, an a uthorized bandwidth (the 
maximum permitted tran smitted bandwidth) of 4  kHz, and the frequency stability is 0.00015%.  
3.9.1.2  Output power: No more than 100mW ( ERP). 
3.9.1.3  Unwanted emission: The unwanted emission shall be attenuated below to the fundamental 
power P (in unit of W) as following,  
(1)  Transmitters with standard -band channel:  
(A) Emissions 12.5  kHz to 22.5  kHz away from the channel center frequency: Minimum  30 
dB. 
(B) Emissions more than 22.5  kHz away from the channel center frequency: Minimum  43 + 
10 log(P) dB.  
(2)  Transmit ters with wide -band channel:  
(A) Emissions 25  kHz to 35  kHz away from the channel center frequency: Minimum  30 dB. 
(B) Emissions more than 35  kHz away from the channel center frequency: Minimum  43 + 
10 log(P) dB.  
(3)  Transmitters  with narrow -band channel:  
(A)  On any freq uency within the authorized bandwidth: 0  dB. 
(B) On any frequency removed from the center of the authorized bandwidth by a 
displacement frequency f d (in kHz) of more than 2  kHz up to and including 3.75  kHz: The 
lesser of 30 + 20 (f d - 2) dB, or 55 + 10 log (P)  dB, or 65  dB. 
(C) On any frequency beyond 3.75  kHz removed from the center of the authorized 
bandwidth: At least 55 + 10 log(P) dB.  
3.9.1.4  The operation of this device shall not interfere with legal communications.  
3.9.1.5  The operational location of this device is limited to educational and training facilities, guided 
facilities, nursing facilities, families, or indoor usage.  
3.9.1.6  If the device is not entirely within a building, the tip of the antenna shall not exceed 30.5m 
above the ground.  
3.10 Operation within the bands 2400 MHz~2 483.5 MHz, 5725 MHz~5875 MHz, 24.00 GHz~24.25 GHz  
3.10.1  Type of device: Intentional radiators employing frequency hopping spread spectrum or digital 
modulation techniques, and meeting Section 3.10.1.6.  
3.10.1.1  Frequency bands:  
(1)  2400 MHz~2483.5 MHz (Intentional radiators employing frequency hopping spread 
spectrum or digital modulation technique)  
(2)  5725 MHz~5850 MHz (Intentional radiators employing frequency hopping spread spectrum)  
3.10.1.2  The maximum peak output power:  
(1)  Operation within 2400 MHz~2483.5 MHz  
(A) For frequency hopping sys tems employing at least 75 hopping channels: below 1 Watt 
(inclusive).  
(B) Frequency hopping systems according to Section 3.10.1.6 (1)  (A) (a) excluded by (A): 
below 0.125 W (inclusive).  
(C) For systems using digital modulation: below 1 Watt (inclusive).  
(2)  For frequ ency hopping systems in 5725 MHz~5850 MHz: below 1  Watt (inclusive).  
In addition to the peak output power described in Appendix 2 for measurement, the maximum 
conducted output power may also be used.   
-  - 143.10.1.3  Limits  of antenna gains:  
(1)  For systems operated in the 240 0 MHz~2483.5 MHz:  
(A) For fixed, point -to-point operations, the peak conducted output power of the intentional 
radiator shall be  reduced by 1dB for every 3dBi when the directional gain of the antenna 
exceeds 6dBi.  
(B) Transmitters that emit multiple directional be ams (including simultaneously or 
sequentially) for the purpose of directing signals to individual receivers or to groups of 
receivers shall comply with the following requirements:  
(a) If the transmitter employs an antenna system that emits multiple directional  beams but 
does not emit multiple directional beams simultaneously, the total output power 
conducted to the array or arrays that comprise the device shall not exceed the limit 
specified in paragraph 3.10.1.2 of this section. However, the total conducted ou tput 
power shall be reduced by 1dB below the specified limits for each 3dBi that the 
directional gain of the antenna/antenna array exceeds 6dBi. The directional antenna 
gain shall be computed as follows:  
(i) Directional gain = 10log (number of array elements o r staves) + the directional 
gain of the element or stave having the highest gain.  
(ii) A lower value for the directional gain than that calculated in paragraph (i) of this 
section will be accepted if sufficient evidence is presented, e.g., due to shading of 
the array or coherence loss in the beam forming.  
(b) If a transmitter employs an antenna that operates simultaneously on multiple directional 
beams using the same or different frequency channel(s), the power supplied to each 
emission beam shall be  subject to the power limit specified in (a). If transmitted beams 
overlap, the power shall be reduced to ensure that their aggregate power does not 
exceed the limit specified in (a). In addition, the aggregate power transmitted 
simultaneously on all beams shall not excee d the limit specified in (a) by more than 8dB. 
The directional gain is calculated the same as (a).  
(c) Transmitters that emit a single directional beam shall operate under the provisions of (1)  
(A) and (3) of this section.  
(2)  When operating in 5725 MHz~5850 MHz a nd by fixed point -to-point operation, the 
directional gain of the transmitting antenna shall exceed 6 dBi without reducing the maximum 
conducted output power.  
(3)  When using the transmitting antennas with the directional gain over 6 dBi except for (1) and 
(2), the maximum conducted output power shall be reduced in equal quantity according to the 
total dBi of the antenna directional gain over 6 dBi.  
3.10.1.4  The antenna specification shall not be subject to the requirement of Section 2.2.  
3.10.1.5  Limits on emissions outside the frequency band : 
In any 100kHz bandwidth outside the frequency band in which the spread spectrum or digitally 
modulated intentional radiator is operating, the radio frequency power that is produced by the 
intentional radiator below that in the 100kHz bandwi dth within the band that contains the highest 
level of the desired power, the attenuation shall be as below:  
(1)  The attenuation shall be at least 20dB when the conducted power is measured according to  
Appendix II of this section , based on either an RF conduc ted or a radiated measurement.  
(2)  The attenuation shall be at least 30dB when the conducted power is measur ed according to 
the paragraph ( 1) (C) of this section 3.10.1. 2. 
In addition, radiated emissions that fall under S ection 2.7 the restricted bands must al so comply with 
the radiated emission limit specified in Section 2.8 . 
3.10.1.6  Other limits:  
(1)  Frequency hopping systems:  
(A) Frequency hopping systems shall have hopping channel carrier frequencies separated 
by a minimum of 25 kHz or the 20 dB bandwidth of the hopping ch annel, whichever is 
greater. However, frequency hopping systems operated in 2400 MHz~2483.5 MHz with 
output power less than or equal to 125 mW, the intervals of hopping channel carrier  
-  - 15frequencies shall not be less than 25 kHz or two thirds of the 20 dB ba ndwidth of the 
hopping channel, whichever is greater.  
(a) Frequency hopping systems in the 2400 MHz~2483.5 MHz band shall use at least 15 
non-overlapping channels. The average time of occupancy on any channel shall be 
less than or equal to 0.4 seconds within a  period of 0.4 seconds multiplied by the 
number of hopping channels employed. The intelligent hopping techniques shall be 
used to avoid the occupancy on specific frequency hopping channel.  
(b) Frequency hopping systems operating in the 5725 MHz~5850 MHz band s hall use at 
least 75 hopping channels. The maximum 20 dB bandwidth of the hopping channel 
shall be less than or equal to 1 MHz. The average time of occupancy on any frequency 
shall be less than or equal to 0.4 seconds within a 30 -second period.  
(2)  Digital mod ulation techniques system:  
(A) For digitally modulated  systems, the minimum 6dB bandwidth shall be at least 500 kHz.  
(B) For digitally modulated systems, the peak power spectral density conducted from the 
intentional radiator to the antenna shall be less than or e qual to 8 dBm in any 3kHz 
band during any time interval of continuous transmission, and shall reduce the power 
spectral density requirement according to the Section 3.10.1.3.  
(3)  Hybrid systems:  
(A) The frequency hopping operation of the hybrid system, with the di rect sequence 
operation or digital modulation turned off, shall have an average time of occupancy on 
any frequency less than or equal to 0.4 seconds within a time period in seconds equal to 
the number of hopping frequencies employed multiplied by 0.4.  
(B) The digital modulation operation of the hybrid system, with the frequency hopping 
turned off, shall comply with the power spectral density requirements of those specified 
in paragraph 3.10.1.6(2)(B).  
(4)  The incorporation of intelligence within a frequency hopping  spread spectrum system that 
permits the system to recognize other users within the spectrum band so that it individually and 
independently chooses and adapts its hop  sets to avoid hopping on occupied channels is 
permitted. The coordination of frequency ho pping systems in any other manner for the express 
purpose of avoiding the simultaneous occupancy of individual hopping frequencies by multiple 
transmitters is prohibited . 
(5)  The incorporation of intelligence within a frequency hopping spread spectrum system t hat 
permits the system to recognize other users within the spectrum band so that it individually and 
independently chooses and adapts its hop  sets to avoid hopping on occupied channels is 
permitted.  The coordination of frequency hopping systems in any othe r manner for the express 
purpose of avoiding the simultaneous occupancy of individual hopping frequencies by multiple 
transmitters is prohibited . 
3.10.2  Type of device: any radiated device.  
3.10.2.1  Frequency bands:  
(1)  2400 MHz~2483.5 MHz  
(2)  5725 MHz~5875 MHz  
(3)  24.00 GHz~24.25 GH z 
3.10.2.2  Fundamental and harmonics emissions: The field strength of the emission shall be less than 
or equal to the limit in the table below except for 3.10.2.3.  
Fundamental frequency 
(MHz)  Field Strength of 
Fundamental Emis sions 
(millivolts/meter)  Field Strength  of Harmonics 
Emis sions (microvolts/meter)  
2400 -2483.5  50 500 
5725 -5875  50 500 
24000 -24250  250 2500  
  
-  - 163.10.2.3  The fixed, point -to-point operation devices operating in the 24.05 GHz~24.25 GHz band shall 
comply with the  following restrictions : 
(1)  Fundamental emissio n: The fundamental field strength at a distance of 3 meters from the 
device shall be less than or equal to 2500 mV/m.  
(2)  Frequency tolerance: Keep within 0.001% of fundamental frequency. This frequency 
tolerance shall be maintained for a temperature variatio n of -20℃~50℃ at normal supply voltage, 
and for a variation in the primary supply voltage within ±15% of the rated supply voltage at a 
temperature of 20°C. For battery operated equipment, the equipment tests shall be performed 
using a new battery and  shall conform  to the requirements of Section 5.18.  
(3)  Antenna gain and main lobe beam  width: The antenna gain shall be over 33 dBi, or the main 
lobe beam  width shall be less than or equal to 3.5 degrees. The orientation angle and the 
elevation plane of the main lo be beam  width  shall comply  with the restrictions . 
Note:  The fixed, point -to-point operation indicates a fixed transmitter transmits the information to a 
fixed receiver at the remote place. The fixed, point -to-point operation shall not include the 
point -to-multipoint system, omnidirectional applications and multiple co -located transmitter to 
transmit the same information.  
3.10.2.4  Emissions radiated outside of the specified frequency bands, except for harmonics, shall be 
attenuated by at least 50 dB below the level o f the fundamental or to the general radiated emission 
limits in Sec. 2.8, whichever is lower . 
3.10.2.5  The field strength indicates the measurement value at a distance of 3 meters from the device, 
and is measured by measurement instrumentation employing an average detector, adhering to  the 
peak requirements of Section 5.15.2. The peak field strength of the point -to-point operation device 
along the antenna orientation angle shall be less than or equal to 2500 mV/m.  
 
3.11 Operation within the bands 2435 MHz~2465 MHz, 5785 MHz~5815 MHz, 10500 MHz~10550 MHz, 
24075 MHz~24175 MHz, 24250 MHz~26650 MHz  
3.11.1  Type of device: Field disturbance sensors, but excluding perimeter protection systems.  
 
3.11.1.1  Frequency bands:  
(1)  2435.0  MHz~ 2465.0 MHz  
(2)  5785 MHz~ 5815 MHz  
(3)  10500 MHz~ 10550 MHz  
(4)  24075 MHz~ 24175  MHz 
3.11.1.2  Fundamental and harmonics emissions: Measured at a distance of 3 meters, the field 
strength shall be less than or equal to the limits in the table below.  
Fundamental frequency 
(MHz)  Field Strength of 
Fundamental Emis sions 
(millivolts/meter)  Field Stre ngth of of 
Harmonics Emis sions 
(microvolts/meter)  
2435 -2465  500 1.6 
5785 -5815  500 1.6 
10500 -10550  2500  25.0 
24075 -24175  2500  25.0 
 
3.11.1.3  Emission outside the band: shall be lower 50 dB at least than fundamental emission or meet 
the requirements of Section 2 .8, whichever is less.  
3.11.1.4  The emission limits are based on measurement instrumentation employing an average 
detector, and must meet the peak requirement of Section 5.15.2.   
-  - 173.11.2  Type of device: The automotive Short Range Radar (SRS) Devices shall operate only when the 
vehicle is operating, e.g., the engine is running or in the specific start. Operation shall occur on ly 
upon specific activation, such as upon starting the vehicle, changing gears, or engaging a turn 
signal. The operation of these devices shall be relat ed to the proper functioning of the 
transportation vehicle (e.g., collision prevention, obstacle detection, blind point detection, 
parking assistance, collision prevention).  
3.11.2.1  Frequency bands: 24250 MHz~26650 MHz  
3.11.2.2  -10 dB bandwidth:  
(1)  The step frequency, frequen cy hopping or other modulation and the device shall be 
maintained for a temperature variation of -20℃~50℃, and for a variation within ±15% of the 
rated supply voltage at a temperature of 20°C. The -10 dB bandwidth shall be in the range of 
24.25 GHz~26.65 GHz.  
(2)  The -10 dB bandwidth shall be greater than or equal to 10 MHz.  
3.11.2.3  Emission limit:  
(1)  The radiated emis sion below 960 MHz shall comply with the requirement s set forth in 
Section 2.8.  
(2)  The EIRP power density up to the radiated emission of 960 MHz shall be less than or equal 
to the RMS average limits in the table below, and measure with RBW=1 MHz:  
Frequency (M Hz) EIRP (dBm)  
960~1610  -75.3 
1610~24250  -61.3 
24250~26650  -41.3 
Above 26650  -61.3 
Note: The tighter limit applies at the band overlap.  
(3)  Radiated emission of GPS band: In addition to the radiated emission limits specified in the 
tables in paragraphs ( 1) and (2) of this section, the EIRP power density for transmitters operating 
under the Section 3.11.2 shall be less than or equal to the RMS average limit I in the table below. 
When measuring, RBW must be greater than or equal to 1 kHz:  
Frequency  (MHz)  EIRP (dBm)  
1164~1240  -85.3 
1559~1610  -85.3 
3.11.2.4  The limiting peak emissions of fundamental emissions (1 MHz ≦RBW≦50 MHz):  
(1)  The peak level of the emissions contained within a 50 MHz bandwidth centered on the 
frequency at which the highest radiated emission must be contained within the 24.25 GHz~26.65 
GHz band.  
(2)  The peak EIRP limit is 20 log (RBW/50) dBm, and RBW sh all not be greater than the −10 
dB bandwidth of the device under test.  
3.11.2.5  Measurement procedures:  
(1)  All emissions at and below 960 MHz are based on measurements employing a CISPR 
quasi -peak detector. Unless otherwise specified, all RMS average emission levels s pecified in 
Section 3.11.2.5 are to be measured utilizing a 1 MHz resolution bandwidth with 1 ms/MHz. The 
frequency span of the analyzer should equal the number of sampling bins times 1 MHz and the 
sweep rate of the analyzer should equal the number of samp ling bins times one millisecond. The 
provision in Section 3.11.2.5 that allows emissions to be averaged over a 100 millisecond period 
shall not apply to devices operating under Section 5.15.3. The video bandwidth of the 
measurement instrument shall not be less than the resolution bandwidth and trace averaging 
shall not be employed.  
(2)  The RMS average emission measurement shall be repeated over multiple sweeps with the 
analyzer set for maximum hold until the amplitude stabilizes.  
(3)  For transmitters that employ fr equency hopping, stepped frequency or similar modulation 
types, the peak emission level measurement, the measurement of the RMS average emission 
levels, the measurement to determine the center frequency, and the measurement to determine  
-  - 18the frequency at wh ich the highest level emission occurs shall be made with the frequency hop 
or step function active. Gated signals may be measured with the gating active.  
(4)  The -10 dB bandwidth is based on measurement using a peak detector, a 1 MHz resolution 
bandwidth, and a video bandwidth greater than or equal to the resolution bandwidth.  
(5)  For transmitters that employ frequency hopping, stepped frequency or similar modulation 
types, the modulation functions of frequency hopping or stepped frequency shall be switched  off 
when measuring the -10 dB bandwidth in Section 3.11.2, and shall be measured by continuously 
operating with fundamental frequency according to the requirement of Section 5.12.  
(6)  Emissions from digital circuitry used to enable the operation of the transmitter ma y comply 
with the limits in Section 2.8 provided it can be clearly demonstrated that those emissions are 
due solely to emissions from digital circuitry contained within the transmitter and the emissions 
are not intended to be radiated from the transmitter' s antenna.  
(7)  Emissions from associated digital devices, e.g., emissions from digital circuitry used to 
control additional functions or capabilities other than the operation of the transmitter, shall 
comply with  the requirement s of Section 2.8.  
(8)  Emissions from  these digital circuits in (6) and (7) above shall not be employed in 
determining the -10 dB bandwidth of the fundamental emission or the frequency at which the 
highest emission level occurs.  
3.12 Operation within the bands 2.9  GHz~3.26 GHz, 3.267  GHz~3.332  GHz, 3.339  GHz~3.3458  GHz, 
3.358  GHz~3.6 GHz 
3.12.1  Type of device: Automatic vehicle identification systems  (AVIS ), which use swept frequency 
techniques for the purpose of automatically identifying transportation vehicles.  
3.12.1.1  Frequency  bands:  
(1)  2.90 GHz~3.26 GHz 
(2)  3.267  GHz~3.332  GHz 
(3)  3.339 0 GHz~3.3458  GHz 
(4)  3.358  GHz~3.600 GHz 
3.12.1.2  Radiated emission  limits:  
(1)  The field strength anywhere within the frequency range swept by the signal shall be less 
than or equal to 3000 microvolts/meter/MHz at 3 meters in any direction  
(2)  The field stre ngth of an AVIS shall be less than or equal to 400 microvolts/meter/MHz in any 
direction within ±10 degrees of the horizontal plane when in its operating position.  
(3)  The field strength of radiated emissions outside the frequency range swept by the signal 
shall be less than or equal to 100 microvolts/meter/MHz at 3 meters, measured from 30MHz 
to 20GHz for the complete system.  
(4)  The emission limits are based on measurement instrumentation employing an average 
detector. The provisions in Section 5. 15.2 for limitin g peak emissions  shall apply.  
(5)  The signal emission from the AVIS shall occur only when the vehicle to be identified is 
within the radiated field of the system.  
(6)  Statements included in the operation instructions: “during use the antenna may not be 
pointed wit hin ±XX degrees of the horizontal plane.” (Note)  
Note:  The double asterisks in condition three (XX) shall be replaced by the responsible party with 
the angular pointing restriction necessary to meet the horizontal emission limit specified in 
Section 2.2.  
-  - 193.12.1.3  Type of Antenna:  A horn antenna or other comparable directional antenna for signal 
emission.  
3.12.1.4  The sweep repetition rate: From 4,000 sweeps per second to 50,000 sweeps per second.  
3.12.1.5  Measuring methods and notices:  
(1)  The field strength denoted by microvolts/meter/MH z along with the intermediate frequency 
of the spectrum analyzer or equivalent measuring receiver shall be measured.  
(2)  When measuring the frequency search for spurious and sideband emissions from 30 MHz 
to 20 GHz exclusive of the swept frequency band, the me asuring instrument shall be as 
close as possible to the unit under test.  
(3)  The angular separation between the direction at which maximum field strength occurs and 
the direction at which the field strength is reduced to 400 microvolts/meter/MHz at 3 meters.  
(4)  The test report shall contain photographs or drawings of the spectrum analyzer display 
showing the entire swept frequency signal and a calibrated scale for the vertical and 
horizontal axes; the spectrum analyzer settings that were used shall be labeled on t he 
photographs or drawings.  
3.13 Operation within the band 57 GHz~66 GHz  
3.13.1  Type of device: Any type of the emission device, but excluding field disturbance sensors not 
fixed to operate and equipment used on aircrafts or satellites.  
3.13.1.1  Within the 57  GHz~ 66 GHz band, emission levels shall not exceed the following equivalent 
isotropically radiated power (EIRP):  
(1)  For fixed field disturbance sensors that occupy 500 MHz or less of bandwidth and that are 
contained wholly within the frequency band 61.0 GHz~61.5 GHz:  
(A) The avera ge power of any emission, measured during the transmit interval, shall be 
less than or equal to 40 dBm, and the peak power of any emission shall be less than or 
equal to 43 dBm.  
(B) The average power of any emission in the 57 GHz~61.0 GHz and 61.5 GHz~66.0 GHz  
bands shall be less than or equal to 10 dBm, and the peak power of any emission shall 
be less than or equal to 13 dBm.  
(2)  For fixed field disturbance sensors other than those operating under the provisions of 
paragraph (1) of this section, the peak transmitt er conducted output power shall be less than or 
equal to -10 dBm and the peak EIRP level shall be less than or equal to 10 dBm  
(3)  For products other than fixed field disturbance sensors, the EIRP shall meet the regulations 
below during the transmit interval:  
(A) For transmitters located outdoors, the average power of any emission shall be less than 
or equal to 82 dBm, and the peak power shall be less than or equal to 85 dBm when the 
antenna gain is greater than 51 dBi; the average power of any emission shall be le ss 
than or equal to 82 -2×(51 -G) dBm, and the peak power shall be less than or equal to 
85-2×(51 -G) dBm when the antenna gain is greater than 51 dBi.  
(B) Except for the provisions of (A) of this part, the average power of any emission shall be 
less than or equa l to 40 dBm, and the peak power of any emission shall be less than or 
equal to 43 dBm  
3.13.1.2  Limits on spurious  emissions:  
(1)  The power density of any emissions outside the 57  GHz~ 66 GHz band shall consist solely of 
spurious emissions . 
(2)  Radiated emissions below 40  GHz shall meet the regulations in Section 2.8 of this part.  
(3)  Between 40 GHz and 200 GHz, the level of these emissions shall be less than or equal to 90 
pW/cm2 at a distance of 3 meters.   
-  - 203.13.1.3  Limits on the total peak transmitter output power . 
(1) For transmitters with an emission bandwidth of greater than or equal to 100 MHz, the total 
peak transmitter output power shall be less than or equal to 500mW.  
(2) Transmitters with an emission bandwidth less than 100 MHz must limit their total peak 
transmitter output power less tha n or equal to 500 mW times their emission bandwidth (MHz) 
divided by 100 MHz.  
(3) For the purposes of this paragraph, the 6 dB emission bandwidth is defined as the 
instantaneous frequency range occupied by a steady state radiated signal with modulation, 
outsid e which the radiated power spectral density shall be less than the maximum radiated 
power spectral density in the band, as measured with a 100 kHz resolution bandwidth 
spectrum analyzer. The center frequency must be stationary during the measurement interv al, 
even if not stationary during normal operation (e.g. for frequency hopping devices).  
(4) Peak transmitter output power shall be measured with an RF detector that has a detection 
bandwidth that encompasses the 57 GHz~66 GHz band and that has a video bandwid th of at 
least 10 MHz, or using an equivalent measurement method.  
3.13.1.4  Frequency stability: This frequency stability shall be maintained for a temperature variation of 
-20℃~50℃ at normal supply voltage, and for a variation in the primary supply voltage within ±15% 
of the rated supply voltage at a temperature of 20°C. The emission frequency shall be contained 
within the 57 GHz~66 GHz band. For battery operated equipment, the  equipment tests shall be 
performed using a new battery, and the requirements of Section 5.18 must be met.  
 
3.14 Operation within the band  76 GHz~77 GHz  
3.14.1  Type of device: restricted to vehicle -mounted field disturbance sensors used as vehicle radar 
systems. The t ransmission of additional information, such as data, is permitted provided the 
primary mode of operation is as a vehicle -mounted field disturbance sensor. Operation under 
the provisions of this section is not permitted on aircraft or satellites.  
3.14.1.1  Frequency bands 76 GHz~77 GHz.  
3.14.1.2  Radiated emission limits: The power density of any emission within the bands specified in 
this section shall be less than or equal to 88 uW/cm2 (EIRP 50 dBm) at a distance of 3 meters from 
the exterior surface of the radiating structur e; the peak power density shall be less than or equal to 
279 uW/cm2 (EIRP 55 dBm).  
3.14.1.3  The power density of any emissions outside the operating band shall consist solely of 
spurious emissions and shall not exceed the following:  
(1)  Radiated emissions below 40 GHz shall meet the regulations in Section 2.8 of this rule.  
(2)  Radiated emissions between 40 GHz and 200 GHz shall be less than or equal to 600 
pW/cm2 at a distance of 3 meters from the exterior surface of the radiating structure:  
(3)  Radiated emissions above 200GHz shall be less than or equal to 1000pW/cm2 at a distance 
of 3 meters from the exterior surface of the radiating structure.  
(4)  The spectrum shall be analyzed  up to 231 GHz.  
3.14.1.4  Fundamental emissions must be contained within the frequency bands specified in this 
section during all conditions of operation. Equipment is presumed to operate over the temperature 
range -20℃~50℃ for a variation in the primary supply voltage within ±15% of the rated supply 
voltage .  
-  - 213.15 Operation within the band 77 GHz~81 GHz  
3.15.1  Type of device: The  automotive Short Range Radar (SRS) Devices shall operate only when the 
vehicle is operating, e.g., the engine is running or in the specific start. Operation shall occur on ly 
upon specific activation, such as upon starting the vehicle, changing gears, or e ngaging a turn 
signal. The operation of these devices shall be related to the proper functioning of the 
transportation vehicle (e.g., collision prevention, obstacle detection, blind point detection, 
parking assistance, collision prevention).  
3.15.1.1  Frequency band s: 77 GHz~81 GHz  
3.15.1.2  Radiated emission limits:  
(1)  Maximum radiated average power spectral density:  
(A) The maximum radiated average power spectral density (including the antenna gain) 
measured in the 1 MHz RBW shall be less than or equal to -3 dBm/MHz (EIRP).  
(B) The spe ctrum analyzer shall be  set with the 1 MHz~10 MHz RBW and 3 MHz video 
bandwidth at minimum . The detector uses the root mean square (RMS) mode. The 
spectral curves measured by the spectrum analyzer shall be recorded in the amplitude 
range of 35 dB. If the p ower spectral density is less than -40 dBm/MHz (EIRP), it shall 
not be recorded.  
(C) When the measuring level is less than the background noise, the related measurements 
shall be conducted in a fully anechoic test chamber.  
(2)  Maximum radiated peak power:  
(A) The spec trum analyzer shall use the 50 MHz RBW. The maximum peak power 
(including antenna gain) measured when the peak detector is set in the maximum hold 
mode shall be less than 55 dBm (EIRP).  
(B) The spectrum analyzer uses 1 MHz ≦RBW<50 MHz. The peak power measured by the 
detector using the peak power in the maximum hold mode shall plus a correct factor of 
20log(RBW/50) dBm [where the RBW represents the resolution bandwidth (a unit of 
MHz)].  
(3)  Maximum radiated spurious and out -of-band emissions:  
(A) The quasi -peak detector with 100 kHz~120 kHz RBW shall be used when the spectrum 
analyzer is set less than 1 GHz, and the peak detector with 1 MHz RBW shall be used 
when the spectrum analyzer is set greater than or equal to 1 GHz.  
(B) The ERP lim its are listed in the table below:  
 
 
 
 
 
 
 
 
 
 
 
 
(4)  Receiver spurious emissions:  
(A) The spectrum analyzer is set the same as (3) (A) above.  Frequency range  Spurious/out -of-band limit  
47 MHz~74 MHz  -54 dBm  
87.5 MHz~118  MHz -54 dBm  
174 MHz~230 MHz  -54 dBm  
470 MHz~862 MHz  -54 dBm  
30 MHz~1 GHz, and 
excluding the bands above  -36 dBm  
1 GHz~100 GHz  -30 dBm  
Note: 1. The 77 GHz ~81 GHz band is excluded.  
2. The tighter limit applies at the band overlap.   
-  - 22(B) The maximum EIRP limits are in the table below:  
 
 
 
 
 
 
(C) This item must not be measured if transmitters are equipped with receivers.  
3.15.1.3  The following conditions shall be additionally measured when measuri ng in 3.15.1.2(1) and 
(2): Temperature variation of -20℃~50℃ at normal supply voltage, and for a variation in the 
primary supply voltage within ±15% of the rated supply voltage at a temperature of 20°C.  
3.15.2  Type of device: Only used for Tank Level Probing Rada r (TLPR).  
3.15.2.1  Frequency bands: 77 GHz~81 GHz.  
3.15.2.2  TLPR devices operating under the provisions of this section shall utilize a dedicated or 
integrated transmit antenna, and the system shall be installed and maintained to ensure a vertically  
downward orientation of the transmit antenna's main beam.  
3.15.2.3  TLPR devices operating under the provisions of this section shall be installed only at fixed 
locations. The TLPR device shall not operate while being moved, or while inside a moving 
container.  
3.15.2.4  Hand -held or resident applica tions are prohibited.  
3.15.2.5  Fundamental emission bandwidth limits:  
(1)  Fundamental emission bandwidth ≧50 MHz.  
(2)  The fundamental emission bandwidth must be in the 77 GHz~81 GHz band.  
(3)  The fundamental bandwidth of an LPR emission is defined as the width of the signal 
between two points, one below and one above the center frequency, outside of which all 
emissions are attenuated by at least 10 dB relative to the maximum transmitter output power 
when measured in an equivalent resolution bandwidth.  
3.15.2.6  Fundamental emissions limi ts: 
(1)  The fundamental emissions limits are as follows:  
(A) The EIRP of average emission power measured by the average detector in 1 MHz shall 
be less than or equal to -3 dBm within a specified bandwidth.  
(B) Based on the frequency point of the maximum average power as the center, the EIRP 
of the peak emission power measured by the peak detector in 50 MHz shall be less than 
or equal to 34 dBm.  
(2)  For a RBW less than 50 MHz when measuring by the peak detector, the peak EIRP limit 
shall plus a correct factor of 20 log (RBW /50) dB where RBW is the resolution bandwidth in MHz.  
(3)  The RBW is in 1 MHz~50 MHz, and the VBW must be greater than or equal to RBW.  
3.15.2.7  Antenna beam  width limits: The -3 dB antenna beam  width shall be less than or equal to 8 
degrees.  
3.15.2.8  Antenna side lobe gain lim it: The antenna side lobe gain limit relative to main beam gain for 
off-axis angles from the main beam of greater than 60 degrees shall be attenuated over 38 dB.  
3.15.2.9  Emissions from digital circuitry used to enable the operation of the transmitter may comply 
with the limits in Section 2.8 provided it can be clearly demonstrated that those emissions are due 
solely to emissions from digital circuitry contained within the transmitter and the emissions are no t 
intended to be radiated from the transmitter's antenna. Emissions from associated digital devices, 
shall be the same. Emissions from these digital circuits shall not be employed in determining the 
-10 dB bandwidth of the fundamental emission or the frequency at which the highest emission level 
occurs.  Frequency range  Limit  
25 MHz~1 GHz  -57 dBm  
1 GHz~100 GHz  -47 dBm  
Note: The tighter limit applies at the band overlap.   
-  - 233.15.2.10  Measureme nt procedures  
(1)  Radiated measurements of the fundamental emission bandwidth and power shall be made 
with maximum main -beam coupling between the LPR and test antennas (boresight).  
(2)  Measurements of the unwanted emissions radiating from an LPR shall be made util izing 
elevation and azimuth scans to determine the location at which the emissions are maximized.  
(3)  All emissions at and below 1,000 MHz (except for 9 kHz~90 kHz and 110 kHz~490 kHz 
bands) are based on measurements employing a CISPR quasi -peak detector . 
(4)  The fundamental emission bandwidth measurement shall be made using a peak detector 
with a resolution bandwidth of 1 MHz and a video bandwidth of greater than or equal to 3 MHz.  
(5)  The measurement procedures in Section 5.15.2 and Section 5.15.3 shall not be applie d to 
Section 3.15.2.  
(6)  The fundamental emission bandwidth shall be greater than or equal to 50 MHz when 
operating in sweep, step or frequency hopping.  
4 Conformance specification of special devices  
4.1 Tunnel radio systems: An intentional radiator utilized as a co mmunication transceiver by the people 
work in the tunnel.  
4.1.1  Frequency bands:  use spectra in Section 2.7 and frequency  
4.1.2  Installation regulation: Operation of a tunnel radio system including intentional radiator and all 
connecting wires shall be contained solel y within a tunnel.  
4.1.3  Radiated emission limits:  The total electromagnetic field from a tunnel radio system on any 
frequency or frequencies appearing outside of the tunnel shall be less than or equal  the limits 
shown in Section 2.8. and shall comply with  Secti on 2.3 should  voltage  be applied  on the public 
utility power lines.  
4.1.4  The antenna specification is not subject to the requirement of Section 2.2  
4.2 Cable locating equipment: An intentional radiator used intermittently by trained operators to locate  
buried cabl es, lines, pipes and similar structures or elements. Operation entails coupling a radio 
frequency signal onto the cable, pipe, etc. and using a receiver to detect the location of that 
structure or element.  
4.2.1  Frequency bands: 9  kHz~ 490 kHz.  
4.2.2  The peak output po wer: Under any type of modulation technique shall be less than or equal  to 
the following limits.  
4.2.2.1  9 kHz~ 45 (exclusive) kHz: 10 watt.  
4.2.2.2  45 kHz~ 490kHz: 1 watt.  
4.2.3  Modulation technique: any kind of non -voice modulation technique.  
4.2.4  It shall follows Section 2.3 if app ly voltage on the public utility power lines.  
4.2.5  The antenna specification is not subject to the requirement of Section 2.2.  
4.3 Radio control devices:  including the remote controlled devices for model toys, industrial purposes 
and also the radio data transceiver s. 
4.3.1  The remote controlled devices for model toys:  including a model aircraft device or a model  
-  - 24surface craft device on the ground or water.  
4.3.1.1  Frequency bands:  
(1)  The frequencies listed below are for any type of remote device operation: 26.995 MHz, 
27.045 MHz, 27 .095 MHz, 27.120 MHz, 27.136 MHz, 27.145 MHz, 27.195 MHz and 27.245 
MHz.  
(2)  The frequencies listed below are for any type of model aircraft device operation only:  
72.00 MHz~72.99 MHz, a channel interval: 20 kHz.  
(3)  The frequencies listed below are for any type o f model surface craft device operation:  
75.41 MHz~75.99 MHz, a channel interval: 20 kHz.  
4.3.1.2  Effective radiated power ( ERP): Under any modulation technique, the carrier power of the 
radio controlled device shall be less than or equal to the following limits.  
(1) 26.995 MHz~27.245 MHz band: model surface craft device: 4 W, model aircraft device: 0.75 
W. 
(2) 72.00 MHz~72.99 MHz band: 0.75 W.  
(3) 75.41 MHz~75.99 MHz band: 0.75 W.  
4.3.1.3  Modulation technique: any kind of non -voice modulation technique.  
4.3.1.4  Bandwidth: within 8 kHz. 
4.3.1.5  The fre quency tolerance:  
(1) 26.995 MHz~27.245 MHz band: The frequency tolerance of the carrier shall be ±0.005  %. 
This frequency tolerance shall be maintained for a temperature variation of -20 ℃~50 ℃ at 
normal supply voltage, and for a variation in the primary supply voltage within ±15  % of the 
rated supply voltage at a temperature of 20  °C. For battery operated equipment, the 
equipment tests shall be performed  using a new battery. In the mean time, it shall meet the 
requirement of Section 5.18.  
(2) 72.00 MHz~72.99 MHz and 75.41 MHz~75.99 MHz bands: The frequency tolerance of the 
carrier shall be ±0.002  %. This frequency tolerance shall be maintained for a temperature 
variation of -20 ℃~50 ℃ at normal  supply voltage, and for a variation in the primary supply 
voltage within ±15  % of the rated supply voltage at a temperature of 20  °C. For battery 
operated equipment, the equipment tests shall be performed  using a new battery. In the 
mean time, it shall mee t the requirement of Section 5.18.  
4.3.1.6  Unwanted emission:  
(1) 26.995 MHz~27.245 MHz band:  
(A) Emissions  ±4 kHz (exclusive) to ±8  kHz (exclusive) from the channel center frequency: 
At least 25 dB.  
(B) Emissions ±8  kHz (exclusive) to ±20  kHz (exclusive) from the channel cen ter frequency: 
at least 35  dB. 
(C) Emissio ns more than ± 20  kHz (exclusive) from the channel center frequency: at least 
43 + 10 log (max. output power) dB.  
(2) 72.00 MHz~72.99 MHz and 75.41 MHz~75.99 MHz bands:  
(A) Emissions ±4  kHz (exclusive) to ±8  kHz ( inclusive) fr om the channel center frequency: 
at least 25 dB.  
(B) Emissions ±8  kHz (exclusive) to ±10  kHz (inclusive) from the channel center frequency: 
at least 45  dB. 
(C) Emissions ±10  kHz (exclusive) to ±20  kHz (inclusive) from the channel center frequency: 
at least 55  dB.  
-  - 25(D) Emissions more than ± 20  kHz (exclusive) from the channel center frequency: at least 
56 + 10 log (max. output power) dB.  
4.3.1.7  Limits:  
(1) One-way control only.  
(2) Compliance with the regulations in Section 2.10.5.   
-  - 264.3.2  Radio controlled devices for industry: Radio frequenc y transceiver used only in the factory 
building for transmitting digital control signal.  
4.3.2.1  Frequency  bands:  Limited to the following frequency.  
 
Channel  Frequency (MHz)  Channel  Frequency (MHz)  
1 480.050  7 480.200  
2 480.075  8 480.225  
3 480.100  9 480.250  
4 480.125  10 480.275  
5 480.150  11 480.350  
6 480.175  12 480.400  
 
4.3.2.2  Effective radiated power ( ERP): shall not exceed 10 mW.  
4.3.2.3  Modulation technique ：F1D and F2D. 
4.3.2.4  Bandwidth: within 8.5  kHz. 
4.3.2.5  Frequency tolerance: within 4ppm. This frequency tolerance shall be maint ained for a 
temperature variation of -20 ℃~50 ℃ at normal supply voltage, and for a variation in the primary 
supply voltage within ±15  % of the rated supply voltage at a temperature of 20  °C. For battery 
operated equipment, the equipment tests shall be per formed using a new battery. In the mean time, 
it shall comply with  the requirement s set forth in  Section 5.18.  
4.3.2.6  Spurious emissions: less than 2.5 uW (ERP) measured by the average detector.  
 
4.3.3  Radio data transceiver: Radio transceiver used restricted inside th e building for voice, images 
and data communication.  
4.3.3.1  Frequency  bands:  
(1) Restricted to the 6 channels below only , 
Channel  Frequency (MHz)  
1 429.1750  
2 429.1875  
3 429.2000  
4 429.2125  
5 429.2250  
6 429.2375  
 
(2) Restricted to the 10 channels below only,  
Chan nel Frequency (MHz)  Channel  Frequency (MHz)  
1 429.8125 / 449.7125  6 429.8750 / 449.7750  
2 429.8250 / 449.7250  7 429.8875 / 449.7875  
3 429.8375 / 449.7375  8 429.9000 / 449.8000  
4 429.8500 / 449.7500  9 429.9125 / 449.8125  
5 429.8625 / 449.7625  10 429.92 50 / 449.8250   
-  - 27Note:  The 10th channel is for control purpose.  
4.3.3.2  Effective radiated  power ( ERP): shall not exceed 10 mW.  
4.3.3.3  Modulation technique:F1D, F2D ,F1E,F2E,F1F, 及F2F. 
4.3.3.4  Bandwidth: within 8.5  kHz. 
4.3.3.5  Adjacent Channel Leakage Ratio: The emission power in the central frequency ±4.25 kHz for 
adjacent channel shall be lower over 40 dB than the carrier power.  
4.3.3.6  For control channel, the duration of each transmissio n shall be less than 0.2 seconds and the 
silent period shall be greater than 2 seconds. For other channel, the duration of each transmission 
shall be less than 40 seconds and the silent period shall be greater than 2 seconds.  
4.3.3.7  Frequency tolerance: within 4 ppm. This frequency tolerance shall be maintained for a 
temperature variation of -20 ℃~50 ℃ at normal supply voltage, and for a variation in the primary 
supply voltage within ±15  % of the rated supply voltage at a temperature of 20  °C. For battery 
operated equipment, the equipment tests shall be performed using a new battery. In the meanti me, 
it shall comply with the requirements set forth in  Section 5.18.  
4.3.3.8  Spurious emissions: less than 2.5 uW (ERP) measured by the average detector.  
4.3.4.  Special note for compliance approval.  
4.3.4.1  The module compliance approval shall be conducted if  the end user can ga in access  to 
replace plug -in type detector module. Each module should contain the whole frequency detection 
circuit including the oscillator. Plug -in type oscillation crystal is not part of the frequency detector 
module and cannot be altered by the us er. 
4.3.4.2  The antenna must be integral attached onto the Low -power radio -frequency devices. 
External antenna shall be prohibited . It shall be vertical polarization and zero gain compared to 
half-wave dipole antenna.  
4.3.4.3  The frequency of the Low -power radio -frequency devi ces should be generated by crystal.  
4.4 Citizens Band Radio Service (CBRS)  
4.4.1  Transmitter:  
4.4.1.1  Frequency bands: from 26.965 MHz~27.405 MHz in total 40 channels (as table below). The 
channel 9 shall be specially marked for emergency call only.  
 
Channel  Frequency 
(MHz)  Channel  Frequency 
(MHz)  Channel  Frequency 
(MHz)  Channel  Frequency 
(MHz)  
1 26.965  11 27.085  21 27.215  31 27.315  
2 26.975  12 27.105  22 27.225  32 27.325  
3 26.985  13 27.115  23 27.235  33 27.335  
4 27.005  14 27.125  24 27.245  34 27.345  
5 27.015  15 27.135  25 27.255  35 27.355  
6 27.025  16 27.155  26 27.265  36 27.365  
7 27.035  17 27.165  27 27.275  37 27.375  
8 27.055  18 27.175  28 27.285  38 27.385  
9 27.065  19 27.185  29 27.295  39 27.395  
10 27.075  20 27.205  30 27.305  40 27.405  
 
4.4.1.2  Modulation technique:  
(1) AM (A3E): ampl itude modulation below 100 %. 
(2) FM (F3E): peak frequency deviation within 2.5 kHz.  
4.4.1.3  Bandwidth:  
     AM (A3E): 8 kHz . 
     FM (F3E): 10 kHz . 
4.4.1.4  The frequency tolerance: within 0.005  %. This frequency tolerance shall be maintained for a  
-  - 28temperature variation of -20 ℃~50 ℃ at normal supply voltage, and for a variation in the primary 
supply voltage within ±15% of the rated supply voltage at a temperature of 20  °C. For battery 
operated equipment, the equipment tests shall be performed using a new battery. In the meantim e, 
it shall comply with the requirements set forth in  Section 5.18.  
4.4.1.5  Effective radiated power (ERP):  
      AM (A3E): within  4 W. 
      FM (F3E): within  5 W. 
4.4.1.6  Power in the adjacent channels:  
(1) AM (A3E): the same as 4.4.1.7(1).  
(2) FM (F3E): less than or equal to 20  nW under normal testing conditions.  
4.4.1.7  Unwanted emission:  
(1)  AM (A3E):  
(A) Emissions ±4 kHz~±8 kHz from the channel center frequency : minimum  25 dB. 
(B) Emissions ±8 kHz~±20 kHz from the channel center frequency  : minimum  35 dB. 
(C) Emissions more than ±20 kHz from the ch annel center frequency : at l minimum  53 + 10 
log (maximum output power) dB.  
(2)  FM (F3E):  
(A) When the transmitter is operating, the spurious power in the following frequency bands 
shall be less than or equal to 4 nW (ERP):  41 MHz~68 MHz, 87.5 MHz~118 MHz, 162  
MHz~230 MHz and 470 MHz~862 MHz . 
(B) In addition to those specifi ed in (A) above, the ERP of spurious power in the frequencies 
from 25 MHz~1 GHz shall be less than or equal to 0.25 μW (ERP).  
(C) In addition to those specified in (A) and (B) above, the ERP of spurious power in the 
frequencies from 1 GHz~2 GHz shall be less t han or equal to 1 uW (ERP).  
(D) When the transmitter is in standby, the ERP of spurious power in the frequencies from 
25 MHz~1 GHz shall be less than or equal to 2 nW (ERP), and in the frequencies from 1 
GHz~2 GHz shall be less than or equal to 20 nW (ERP).  
4.4.2  The receiver:  
4.4.2.1  Unwanted  emission: The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2.8.  
4.5 Family Radio Service (FRS)  
4.5.1  Frequency bands: It is limited to the following 14 channels (the total channel number d isplayed 
shall l be less than or equal to 14).  
 
Channel  Frequency (MHz)  Channel  Frequency (MHz)  
1 467.5125  8 467.60  
2 467.525  9 467.6125  
3 467.5375  10 467.625  
4 467.550  11 467.6375  
5 467.5625  12 467.650  
6 467.575  13 467.6625  
7 467.5875  14 467.675  
 
4.5.2  Modulation technique:F3E/F2D . 
4.5.3  Effective radiated power (ERP): below 1 Watt.  
4.5.4  Bandwidth: within 12.5  kHz. 
4.5.5  The frequency tolerance: within 2.5 ppm. This frequency tolerance shall be maintained for a 
temperature variation of -20 ℃~50 ℃ at normal supply voltage, and for a variation in the primary  
-  - 29supply voltage within ±15  % of the rated supply voltage at a temperature of 20  °C. For battery 
operated equipment, the equipment tests shall be performed using a new battery. In the mean 
time, it shall meet the requirement of Section 5.18.  
4.5.6  Peak frequency deviation of F3E: within ±2.5 kHz.  
4.5.7  Audio frequency response of F3E: within 3.125 kHz.  
4.5.8  Unwanted emission:  
4.5.8.1  F3E:  
(1)  Emissions ±6.25 kHz (exclusive) to ±12.5 kHz (inclusive) from the channel cente r frequency 
attenuated over 25 dB.  
(2)  Emissions ±12.25 kHz (exclusive) to ±31.5 kHz (inclusive) from the channel center frequency 
attenuated over 35 dB.  
(3)  Emissions more than ±31.25 kHz from the channel center frequency shall be attenuated over 
43+10log (maximu m output power) dB.  
4.5.8.2  F2D: within 50 uW (ERP).  
4.5.9  Receiver: Effective radiated power (ERP) within 20 nW.  
4.5.10  Any antenna and power amplifier connected to FRS transmitter can be used with FRS in this 
section after approved by he committee.  
4.5.11  The connecting to the exte rnal power is allowed, but the effective radiated power (ERP) shall be 
less than or equal to 1 Watt.  
4.5.12  FRS shall be permitted  for one -way or two -way voice or no -voice communications.  
4.5.13  One-way voice or non -voice communications shall be  limited to establish voi ce communications, 
send text messages, emergency messages, or location information.  
4.5.14  Non-voice communications:  
4.5.14.1  A non -voice emission is limited to squelch tones, such as CTCSS (Continuous Tone 
Controlled Squelch System) and CDCSS (Continuous Digital Controll ed Squelch System) to 
establish or continue communications. If the audible tones are more than 300 Hertz, it shall not  
last longer than 15 seconds at one time; if the audible tones are less than or equal to 300 Hertz, the 
restriction shall not apply . 
4.5.14.2  The FRS unit may transmit digital data containing text messages, emergency messages, 
GPS information, or requesting location information from one or more other FRS units. Digital data 
transmissions must be initiated manually  or by command of a user, except in the case of an FRS 
unit receiving an interrogation request to automatically respond with its location. Digital data 
transmissions shall be less than or equal to one second, and shall be limited to less than or equal to 
one digital transmission within a thi rty-second period, except in the case  an FRS unit automatically 
respond to one interrogation request , which shall  not be limited. FRS units are prohibited from 
transmitting data in store -and-forward packet operation mode.  
4.5.15  Connect ing to public telecommunica tions system  is prohibited . 
4.6 Low-Power Wireless Microphone and Wireless Earphone: A low power wireless microphone is 
used for transmission of voice or music by radio waves to remote receiving equipments . 
4.6.1  Frequency bands: 227.1 MHz~227.4 MHz, 229.4 MHz~230.0  MHz, 231.0 MHz~231.9 MHz, 510 
MHz~530 MHz, 748 MHz~758 MHz, 803 MHz~806 MHz, 1790 MHz~1805 MHz  
4.6.2  Necessary bandwidth:  
4.6.2.1  The necessary bandwidth for the system with the operating frequency (fc) less than 1 GHz 
shall be less than or equal to 200 kHz, and shall comply with the mask standard s in the  following  
two tables.  
  
-  - 30Frequency deviation  
f Analog system  
Limit  
(dBc)  RBW  VBW  Detector  Trace  Span  
± (0 ≤ f ≤ 0.35B)  0 ~ -20 (Note 1)  1 kHz  1 kHz  RMS  Max Hold  fc ± 1 MHz  
± (0.35B ≤ f ≤ 0.5B)  -20 ~ -60 (Note 1)  1 kHz  1 kHz  RMS  Max Hold  fc ± 1 MHz  
± (0.5B ≤ f ≤ B)  -60 ~ -80 (Note 1)  1 kHz  1 kHz  RMS  Max Hold  fc ± 1 MHz  
± (B ≤ f ≤ 1MHz)  -80 ~ -90 (Note1)  1 kHz  1 kHz  RMS  Average  fc ± 1 MHz  
Note: 1. For the limits calculated by linear interpolations, please see Figure 1.  
2. The tighter limit applies at the band overlap.  
3. B indicates the bandwidth stated by the supplier.  
 
Figure 1  
 
 
 
 
 
 
 
 
 
 
 
Figure 2 Frequency 
deviation  
f Digital system (<1 GHz)  
Limit  
(dBc)  RBW  VBW  Detector  Trace  Span  Sweep Time  
± (0 ≤ f < 0.5B)  0 1 kHz  1 kHz  RMS  Max Hold  ≥ 5 x B  ≥ 2 seconds  
± (0.5B ≤ f ≤ 
1.75B)  -30 ~ -80 
(Note 1)  1 kHz  1 kHz  RMS  Max Hold  ≥ 5 x B  ≥ 2 seconds  
± (1.75B ≤ f ≤ 5B)  -80 ~ -90 
(Note 1)  1 kHz  1 kHz  RMS  Average  ± (1.75B ≤ f ≤ 5B)  2 seconds  
Per 200 kH z 
Note: 1. For the limits calculated by linear interpolations, please see Figure 2.  
2. The tighter limit applies at the band overlap.  
3. B indicates the bandwidth stated by the supplier.  
 
-  - 314.6.2.2  The necessary bandwidth for the system with th e operating frequency (fc) greater than 1 GHz 
shall be less than or equal to 600 kHz, and comply with the  mask standard in the table below . 
Frequency 
deviation  
f Digital system (>1 GHz)  
Limit (dBc)  RBW  VBW  Detector  Trace  Span  Sweep Time  
± (0 ≤ f < 0.5B)  0 1 kHz  1 kHz  RMS  Max Hold  ≥ 5 x B  ≥ 2 seconds  
± (0.5B ≤ f ≤ B)  -40 ~ -60 
(Note 1)  1 kHz  1 kHz  RMS  Max Hold  ≥ 5 x B  ≥ 2 seconds  
± (B ≤ f ≤ 
1MHz)  -60 1 kHz  1 kHz  RMS  Average  ± (B ≤ f ≤ 1MHz)  2 seconds  
per 200 kHz  
Note: 1. For the lim its calculated by linear interpolations, please see Figure 3.  
2. The tighter limit applies at the band overlap.  
3. B indicates the bandwidth stated by the supplier.  
 
Figure 3 
4.6.2.3  For the measurement method, please see ETSI EN300 422 -1. 
 
4.6.3  Fundamental emission (ERP):  
4.6.3.1  Operation within the bands 227.1 MHz~227.4 MHz, 229.4 MHz~230.0 MHz, 231.0 
MHz~231.9 MHz:  
Channel Bandwidth  ERP limit 
No more than 50kHz  No more than 10mW.  
Below 200kHz, above 50kHz (exclusive)  No more than 5mW  
4.6.3.2  Operation within the 510.0 MHz~530. 0 MHz band: below 50 mW.  
4.6.3.3  Operation within the 748.0 MHz~758.0 MHz band: below 10 mW.  
4.6.3.4  Operation within the 803.0 MHz~806.0 MHz band: below 10 mW.  
4.6.3.5  Operation within the 1790.0 MHz~1805.0 MHz band: below 10 mW.  
4.6.3.6  The carrier power must be operated according to t he table below when measuring the 
channel width.  
Carrier power measurement  
Central 
emission 
frequency  RBW  VBW  Detector  Trace  Span  Sweep Time  
fc 5 x B  5 x B  RMS  Average  Zero Span  ≥ 2 seconds  
Remark: B represents the emission bandwidth.  
  
-  - 324.6.4  Frequency deviation: less than or equal to ±75 kHz, solely applied to analog system.  
4.6.5  Frequency stability:  
4.6.5.1  Operating frequency less than 1 GHz: 20 ppm  
4.6.5.2  Operating frequency greater than 1 GHz: 15 ppm  
4.6.6  Spurious  emission ( ERP): 
             
 
 
 
 
 
4.6.7  Spuriou s emission of receiver (ERP): below 2 nW (inclusive).  
4.6.8  The antenna attached to transmitter shall be an integral structure.  
4.6.9  The frequency stability shall be maintained  over a temperature variation of -10 ℃~45 ℃ at 
normal supply voltage, and for a variation i n the primary supply voltage within ±15  % of the rated 
supply voltage at a temperature of 20  °C. For battery operated equipment, the equipment tests 
shall be performed using a new battery. In the meantime, it shall conform to the requirement of 
Section 5.1 8. 
 
4.7 Unlicensed National Information Infrastructure: Use wideband digital modulation techniques and 
provide a wide array of high data rate mobile and fixed communications for individuals, businesses, 
and organizations.  
4.7.1  Operating frequencies : 5.15 GHz~5.25 G Hz, 5.25 GHz~5.35 GHz, 5.470 GHz~5.725 GHz and 
5.725 GHz~5.85 GHz.  
4.7.2  Terminology:  
4.7.2.1  Average symbol envelope power: The average symbol envelope power is the average, taken 
over all symbols in the signaling alphabet, of the envelope power for each symbol.  
4.7.2.2  Digita l modulation: The process by which the characteristics of a carrier wave are varied 
among a set of predetermined discrete values in accordance with a digital modulating function as 
specified in document ANSI C63.17 -1998.  
4.7.2.3  Emission bandwidth: For purposes of  this subpart the emission bandwidth shall be 
determined by measuring the width of the signal between two points (one below and one above the 
carrier center frequency ) that are 26 dB down relative to the maximum level of the modulated 
carrier. Determinatio n of the emissions bandwidth is based on the use of measurement 
instrumentation employing a peak detector function with an instrument resolution bandwidth 
approximately equal to 1  % of the emission bandwidth of the device being measured . 
4.7.2.4  Access Point (AP):  A U-NII transceiver that operates either as a bridge in a peer -to-peer 
connection or as a connector between the wired and wireless segments of the network.  
4.7.2.5  Available Channel: A radio channel on which a Channel Availability Check has not identified 
the pre sence of radar.  
4.7.2.6  Power spectral density: The power spectral density is the total energy output per unit 
bandwidth from a pulse or sequence of pulses for which the transmit power is at its maximum level, 
divided by the total duration of the pulses. This tota l time does not include the time between pulses 
during which the transmit power is off or below its maximum level.   Frequency  
     47 MHz~74 MHz,  
87.5 MHz~137 MHz,  
174 MHz~230 MHz,  
     470 MHz~862 MHz  < 1 GHz  ＞1 GHz  
Operating 
state  Below 4 nW  Below 250 nW  Below 1 uW  
Standby state Below 2 nW  Below 2 nW  Below 20 nW   
-  - 334.7.2.7  Pulse: A pulse is a continuous transmission of a sequence of modulation symbols, during 
which the average symbol envelope power is constant.  
4.7.2.8  Operating Channel: Once a U -NII device starts to operate on an Available Channel then that 
channel becomes the Operating Channel.  
4.7.2.9  Transmit Power Control (TPC): A feature that enables a U -NII device to dynamically switch 
between several transmission power l evels in the data transmission process.  
4.7.2.10  Channel Availability Check: A check during which the U -NII device listens on a particular 
radio channel to identify whether there is a radar operating on that radio channel.  
4.7.2.11  Dynamic Frequency Selection (DFS): A mecha nism that dynamically detects signals from 
other systems and avoids co -channel operation with these systems (notably radar systems).  
4.7.2.12  DFS Detection Threshold: The required detection level defined by detecting a received signal 
strength that is greater than a threshold specified, within the U -NII device channel bandwidth.  
4.7.2.13  Channel Move Time: The time needed by a U -NII device to cease all transmissions on the 
current channel upon detection of a radar signal above the DFS detection threshold.  
4.7.2.14  In-Service Monitori ng: A mechanism to check a channel in use by the U -NII device for the 
presence of a radar.  
4.7.2.15  Non-Occupancy Period: The required period in which, once a channel has been recognized 
as containing a radar signal by a U -NII device, the channel will not be select ed as an available 
channel.  
4.7.2.16  Maximum Power Spectral Density: The maximum power spectral density within the specified 
measurement bandwidth, within the U -NII device operating band.  
4.7.3  Power limits  
4.7.3.1  For the band 5.15 GHz~5.25 GHz  
(1)  For outdoor access:  
(A) The maximum c onducted output power shall be less than or equal to 1 Watt.  
(B) The maximum power spectral density shall be less than or equal to 17 dBm in any 1 
MHz band.  
(C) If transmitting antennas of directional gain greater than 6 dBi are used, both the 
maximum conducted ou tput power and the maximum power spectral density shall be 
reduced by the amount in dBi that the directional gain of the antenna exceeds 6 dBi.  
(D) The maximum EIRP at any elevation angle above 30 degrees as measured from the 
horizon shall be less than or equa l to 21 dBm.  
(2)  For indoor access:  
(A) The maximum conducted output power over the frequency band of operation shall be 
less than or equal to 1 Watt.  
(B) The maximum power spectral density shall be less than or equal to 17 dBm in any 1 
MHz band.  
(C) If transmitting anten nas of directional gain greater than 6 dBi are used, both the 
maximum conducted output power and the maximum power spectral density shall be 
reduced by the amount in dBi that the directional gain of the antenna exceeds 6 dBi.  
(3)  For fixed point -to-point acces s: 
(A) The maximum conducted output power shall be less than or equal to 1 Watt.  
(B) The maximum power spectral density shall be less than or equal to 17 dBm in any 1 
MHz band.  
(C) If transmitting antennas of directional gain greater than 23 dBi are used, both the 
maximum conducted output power and the maximum power spectral density shall be 
reduced by the amount in dBi that the directional gain of the antenna exceeds 23 dBi.  
(D) Fixed, point -to-point operations exclude the use of point -to-multipoint systems, 
omnidirection al applications, and multiple collocated transmitters transmitting the same 
information.   
-  - 34(4)  For client devices:  
(A) The maximum conducted output power shall be less than or equal to 250 mW.  
(B) The maximum power spectral density shall be less than or equal to 11 dBm in any 1 
MHz band.  
(C) If transmitting antennas of directional gain greater than 6 dBi are used, both the 
maximum conducted output power and the maximum power spectral density shall be 
reduced by the amount in dBi that the directional gain of the antenna excee ds 6 dBi.  
4.7.3.2  For the 5.25 GHz~5.35 GHz and 5.470 GHz~5.725 GHz bands  
(1)  The maximum conducted output power shall be less than or equal to 250 mW or 11dBm+10log 
B (B is the 26 dB emission bandwidth with a unit of MHz) whichever is less.  
(2)  The maximum power spectral  density shall be less than or equal to 11 dBm in any 1 MHz band.  
(3)  If transmitting antennas of directional gain greater than 6 dBi are used, both the maximum 
conducted output power and the maximum power spectral density shall be reduced by the 
amount in dBi  that the directional gain of the antenna exceeds 6 dBi.  
4.7.3.3  For the 5.725 GHz~5.850 GHz band  
(1)  The maximum conducted output power shall be less than or equal to 1 Watt.  
(2)  The maximum power spectral density shall be less than or equal to 30 dBm in any 500 kHz 
band . 
(3)  Fixed point -to-point U -NII devices operating in this band may employ transmitting antennas with 
directional gain greater than 6 dBi without any corresponding reduction in transmitter 
conducted power.  
(4)  In addition to (3), if transmitting antennas of direct ional gain greater than 6 dBi are used, both 
the maximum conducted output power and the maximum power spectral density shall be 
reduced by the amount in dBi that the directional gain of the antenna exceeds 6 dBi.  
4.7.3.4  Measurement regulations  
(1)  The maximum conduct ed output power must be measured over any interval of continuous 
transmission using instrumentation calibrated in terms of a rms -equivalent voltage. The 
measurement results shall be properly adjusted for any instrument limitations (such as 
detector respons e times, limited resolution bandwidth capability when compared to the 
emission bandwidth, sensitivity, etc.,) so as to obtain a true peak measurement conforming to 
the above definitions for the emission in question.  
(2)  The measurement regulations for the peak  power spectral density:  
(A) A calibrated test instrument shall be directly connected to the equipment under test, 
measured as a conducted emission.  
(B) In the 5.15 GHz~5.25 GHz, 5.25 GHz~5.35 GHz and 5.47 GHz~5.725 GHz bands, the 
bandwidth of a calibrated test in strument shall be set as 1 MHz bandwidth or 26 dB 
emission bandwidth for the equipment under test, whichever is less.  
(C) In the 5.725 GHz~5.850 GHz band, the bandwidth of a calibrated test instrument shall 
be set as 500 kHz or 26 dB emission bandwidth for the  equipment under test, whichever 
is less.  
(D) When the resolution bandwidth is less than that in (B) or (C), the total power spectral 
density shall be calculated by the compensation.  
4.7.4  Undesirable emission limits: The maximum emissions outside of the frequency b ands of  
operation shall be attenuated in accordance with the following limits:  
4.7.4.1  For transmitters operating in the 5.15 GHz~5.35 GHz and 5.470 GHz~5.725 GHz bands: 
out-of-band EIRP ≦-27 dBm/MHz.  
4.7.4.2  For transmitters operating in the 5.725 GHz~5.850 GHz band: All emissions within the  
-  - 35frequency range from the band edge to 5 MHz above or below the band edge shall be less than or 
equal to an EIRP of 27 dBm/MHz~15.6 dBm/MHz (limits correspond ing to linear method); all 
emissions within the frequency range from the band edge to 5 MHz~25 MHz above or below the 
band edge shall be less than or equal to an EIRP of 15.6 dBm/MHz~10 dBm/MHz (limits 
corresponding to linear method); all emissions within the frequency range from the band edge to 25 
MHz~75 MHz above or below the band edge shall be less than or equal to an EIRP of 10 
dBm/MHz~ -27 dBm/MHz (limits corresponding to linear method); for frequencies 75 MHz or 
greater above or below the band edge, emissions shall be less than or equal to an EIRP of -27 
dBm/MHz; for the mask limit, please see Figure 1.  
 
Figure 1  
4.7.4.3  When measuring unwanted emissions, the emission measurements shall be performed using 
a minimum resolution bandwidth of 1 MHz. A resolution bandwidth less than 1 MHz may be 
employed near the band edge, when necessary, and the total value is calculated by compensation . 
4.7.4.4  When measuring the unwanted emission limits, the carrier frequency for the equipment under 
test shall be adju sted as close to the upper and lower frequency band edges as the design of the 
equipment permits.  
4.7.4.5  The unwanted emissions below 1 GHz shall meet the requirement of Section 2.8. Any 
devices supplied by the commercial power must adhere to  the power line condu cted limit of Section 
2.3. 
4.7.4.6  The unwanted emissions operating in the band of Section 2.7 shall conform to  the 
requirement of Section 2.8.  
4.7.4.7  The devices operating in the 5.725 GHz~5.850 GHz band and the antenna gain greater than 
10dBi must apply to the out -of-band radiated emission limits of Section 3.10.1.5 before March 2, 
2017；those operating in the 5.725 GHz~5.850 GHz and the antenna gain less than or equal to 
10dBi must apply for the out -of-band radiated emission limits of Section 3.10.1.5 before March 2, 
2018. 
4.7.5  Within the 5.725 GHz~5.850 GHz band, the minimum 6 dB bandwidth of U -NII devices shall be 
at least 500 kHz.  
4.7.6  The device shall automatically discontinue transmission in case of “either absence of 
information to transmit” or “operational failure”. These p rovisions are not intended to preclude 
the transmission of control or signaling information or the use of repetitive codes used by certain 
digital technologies to complete frame or burst intervals. Applicants shall include in their 
application for equipmen t authorization a description of how this requirement is met.  
4.7.7  Other limits:  
4.7.7.1  Transmit power control (TPC): U -NII devices operating in the 5.25 GHz~5.35 GHz and 5.470 
GHz~5.725 GHz bands shall employ a TPC mechanism. The U -NII device is required to have the  
-  - 36capability to operate at least 6 dB below the mean EIRP value of 30 dBm. A TPC mechanism is not 
required for systems with an EIRP of less than 500 mW.  
4.7.7.2  U-NII devices operating in the 5.25 GHz~5.35 GHz and 5.470 GHz~5.725 GHz bands shall 
employ a DFS radar d etection mechanism to detect the presence of radar systems and to avoid 
co-channel operation with radar systems. The related regulations are as follows:  
(1)  Minimum DFS detection threshold  
(A) For devices with a maximum EIRP of 200 mW~1 W, the minimum DFS detectio n 
threshold is -64 dBm.  
(B) For devices that operate with less than a maximum EIRP of 200 mW and a power 
spectral density of less than 10 dBm in a 1 MHz band, the minimum DFS detection 
threshold shall be  -62 dBm.  
(C) For devices that operate with less than a maxim um EIRP of 200 mW and a power 
spectral density of greater than or equal to 10 dBm in a 1 MHz band, the minimum DFS 
detection threshold shall be  -64 dBm.  
(D) The detection threshold is the received power averaged over 1 microsecond referenced 
to a 0 dBi antenna . For the initial channel setting, the manufacturers shall be permitted 
to provide for either random channel selection or manual channel selection.  
(2)  Operational modes. The DFS requirement applies to the following operational modes:  
(A) The requirement for chann el availability check time applies in the master operational 
mode.  
(B) The requirement for channel move time applies in both the master and slave 
operational modes.  
(3)  Channel availability check time: A U -NII device shall check if there is a radar system already 
operating on the channel before it can initiate a transmission on a channel and when it has to 
move to a new channel. The U -NII device may start using the channel if no radar signal with 
power level greater than the interference threshold values listed abo ve is detected within 60 
seconds.  
(4)  Channel move time: After a radar’s presence is detected, all transmissions shall cease on the 
operating channel within 10 seconds. Transmissions during this period shall consist of normal 
traffic for a maximum of 200ms aft er detection of the radar signal. In addition, intermittent 
management and control signals can be sent during the remaining time to facilitate vacating 
the operating channel.  
(5)  Non-occupancy period: A channel that has been flagged as containing a radar syste m, either 
by a channel availability check or in -service monitoring, is subject to a nonoccupancy period of 
at least 30 minutes. The non -occupancy period starts at the time when the radar system is 
detected.  
4.7.7.3  A radio information transmission device must own the safety function to protect the software 
change from the party without authorization. The manufacturers shall propose the certificates or 
compliance statement that meets the regulations in this section.  
4.7.7.4  The manufacturers operate the digital modulation s ystem on the U -NII bands to provide the 
safety function, so that the third party  is unable to  overwrite program and set without approval. The 
software must avoid transmitters operating in the frequency, output power, modulation technique or 
other RF withou t approval. The manufacturers can operate the private network to download 
software only authorized by users and update the electronic signature by software or firmware by 
hardware. New software is permitted to be legally installed  in the  equipment. In the meantime, the 
items above can be met, and the authorization methods are described in the application.  
4.7.7.5  The Manufacturers shall ensure DFS cannot  be cancelled by a user who operates a radio 
information transmission device.  
4.7.8  The antenna specifications shall no t be subject to the requirement of Section 2.2.  
4.7.9  The operation manuals or the specifications shall not only specify the items, except for the 
requirement of Section 2.10, but also the following items:   
-  - 374.7.9.1  The operations near the radar system shall not be influe nced.  
4.7.9.2  The directed antenna with high gain must apply to the fixed point -to-point system only.  
 
 
4.8 Radio Frequency Identification (RFID) , radio beacon in seaside, and other IoT devices.  
4.8.1  Adopted frequency hopping system or digital modulation technique devices,  excluding passive 
tag devices.  
4.8.1.1  Use Frequency:  
(1)  Radio  frequency identification (RFID) devices: 920 MHz to 928 MHz 。 
(2)  Radio beacon in seaside: 926 MHz to 928 MHz 。 
(3)  Other IoT devices: 920 MHz to 925 MHz 。 
4.8.1.2  Restrictions to power efficiency: : 
(1)  Installed areas and the maximum peak output power limit except the radio be acon in seaside.  
(A) For devices installed indoors or at a specific area: the maximum peak output power limit 
shall be up to 1 W (inclusive).  
(B) For devices installed outdoors: the maximum peak output power limit shall be up to 0.5 
W (inclusive).  
(C) As aforementione d in paragraph (A), “specific area” is specified to particular, closed and 
restricted fields with management (both indoors and outdoors).  
(2)  The maximum  peak output power of radio beacon in seaside shall be limited up to 0.5 W 
(inclusive).  
(3)  If transmitting ant ennas of directional gain greater than 6 dBi are used, the maximum 
conducted output power from the intentional radiator shall be reduced by the amount in dB 
that exceeds 6 dBi.  
4.8.1.3  The antenna  specification shall not be subject to the requirement of Section 2. 2. 
4.8.1.4  Radiated emission limits:  
In any 100 kHz bandwidth outside the frequency band in which the spread spectrum intentional 
radiator is operating, the radio frequency power shall be attenuated at least 20 dB and the 
measured RMS shall be 30 dB below that in the 100 kHz bandwidth within the band that 
contains the highest level of the desired power, based on either an RF conducted or a radiated 
measurement. In addition, for radiated emissions that fall under  Section 2.7 the restricted bands 
must also comply wit h the radiated emission limit specified in Section 2.8 . 
4.8.1.5  Other limits:  
(1)  Frequency  hopping  systems:  
(A) Frequency hopping systems shall include  hopping channel carrier frequencies 
separated by a minimum of 25 kHz or the 20 dB bandwidth of the hopping channel, 
whichever is greater. The system shall hop to channel frequencies that are selected at 
the system hopping rate from a pseudo randomly  ordered list of hopping frequencies. 
Each frequency must be used equally on the average by each transmitter.  
(B) Hopping channels  and 20  dB bandwidth limits:  If the 20 dB bandwidth of the hopping 
channel is less than or equal to 250 kHz, the system shall use at least X hopping 
frequencies.  If the 20  dB bandwidth of the hopping channel is greater than 250 kHz, the 
system shall use at  least X/2 hopping frequencies.  The maximum allowed 20  dB 
bandwidth of the hopping channel shall be  500 kHz. 
X＝used frequency band （MHz）/26*50,  
and adopted unconditional carry law to integer; besides, X ≧10  
-  - 38(C) Frequency hopping systems, the average time of occ upancy on any frequency each 
time shall be less than or equal  to 0.4 seconds within a time period in seconds equal to 
the number of hopping channels  limit employed multiplied by 0.4.  
(2)  Digital modulation  techniques system:  
(A) For digitally modulated systems, th e minimum 6  dB bandwidth shall be at least 500  kHz. 
(B) The power spectral density from the transmitter to the antenna in any 3 kHz bandwidth 
of the frequency band shall be less than or equal to 8 dBm . 
(3)  The hybrid system: The hybrid systems employ a combination  of both frequency hopping and 
digital modulation techniques.  
(A) The frequency hopping operation of the hybrid system, with the direct sequence 
operation turned off, shall include  an average time of occupancy on any frequency each 
time less than or equal  0.4 seconds within a time period in seconds equal to the number 
of hopping channels employed multiplied by 0.4.  
(B) The digital modulation operation of the hybrid system, with the frequency hopping 
turned off, shall comply with th e power spectrum density requireme nts of those 
specified in ( B) of Digital modulation techniques system of Section 2 Other limits in this 
section 4.8.1.4.  
(4)  Frequency hopping spread spectrum systems are not required to employ all available hopping 
channels during each transmission. However, the system, consisting of both the transmitter 
and the receiver, must be designed to comply with all of the regulations in section  4.8.1  should 
the transmitter be presented with a continuous data (or information) stream. In addition, a 
system employing sho rt transmission bursts must comply with the definition of a frequency 
hopping system and must distribute its transmissions over the minimum number of hopping 
channels specified in section  4.8.1. . 
(5)  The incorporation of intelligence within a frequency hoppin g spread spectrum system that 
permits the system to recognize other users within the spectrum band so that it individually 
and independently chooses and adapts its hop  sets to avoid hopping on occupied channels 
shall be  permitted.  The coordination of frequ ency hopping systems in any other manner for the 
express purpose of avoiding the simultaneous occupancy of individual hopping frequencies by 
multiple transmitters is not permitted.  
4.8.2  Any transmission  device.  
4.8.2.1  Use frequency: same as 4.8.1.1.  
4.8.2.2  Radiated emissions  limits: All field strength limits are specified at a distance of 3 meters. The 
field strength of fundamental and harmonic emissions shall comply with the limits shown in the 
table below. Emissions radiated outside of the specified frequency bands, except for harmonics, 
shall be attenuated by at least 50dB below the level of the fundamental or to the general radiated 
emission limits in Section 2.8, whichever is the lesser attenuation.  
Field Strength of Fundamental 
(mv/m)  Field Strength of Harmonics 
Emission  (μv/m)  
50 500 
4.8.2.3  The emission limits are based on measurement instrumentation employing an average 
detector. The provisions in Section 5.15.2 for limiting peak emissions shall apply.  
4.9 Auto, motorcycle theft -proof remote control  
4.9.1  Frequency bands:  467.4625 MHz~467.4875 MHz  
4.9.2  Output power: No more than 0.5 W ( ERP) 
4.9.3  Unwanted emission:  The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2.8.   
-  - 394.9.4  Only for transmitting control signals.  
4.9.5  The frequency tolerance:  
Shall be maintained within ±3 ppm of the operating bands. This frequency tolerance shall 
be maintained for a temperature variation of -5 °C to +50  °C at normal supply voltage, and for a 
variation in the primary supply voltage within ±15  % of the rated supply voltag e at 20  °C. For 
battery -powered equipment, the equipment tests shall be performed using  a new battery.  
4.9.6  Types of operation:  
4.9.6.1  Devices with manual operation must be fitted with a switch. Emissions shall be stopped 
within 5 seconds after you push and release th e switch.  
4.9.6.2  For devices with automatic control mechanism: The duration of each emission shall be less 
than 5 seconds. The off time between emission cycles shall be greater than 5 seconds. Emissions 
are prohibited after 2 minutes of each trigger or state chan ge. 
4.10 Assistive vision disabled communication devices  
 
4.10.1  Frequency  bands:  475.5 MHz~476.5 MHz  
4.10.2  Output power: No more than 0.5 W ( ERP) 
4.10.3  Unwanted emission: The field strength of unwanted emissions shall not exceed the general 
radiated emission limits in Section 2. 8 
4.10.4  Frequency tolerance:  
The frequency tolerance of the carrier shall be ±0.01  %. This frequency tolerance shall be 
maintained for a temperature variation of -5 °C to +50  °C at normal supply voltage, and for a 
variation in the primary supply voltage within ± 15 % of the rated supply voltage at 20  °C. For 
battery -powered equipment, the equipment tests shall be performed using a new battery.  
4.11 Medical Device  Radio  communication Service (M edRadio ): is a medical service system specifically 
for transmitting data in s upport of diagnostic or therapeutic functions between an external 
programmer/control transceiver and an active medical implant or body -worn transceiver placed in 
the human body.  
 
4.11.1  Operating frequencies : 401 MHz~406 MHz, 
4.11.2  Terminology:  
4.11.2.1  Emission bandwidth: The emission bandwidth shall be determined by measuring the width of 
the signal between two points, one below the carrier center frequency and one above the carrier 
center frequency, that are 20  dB down relative to the maximum level of the modulated carrier. 
Determination of the emissions bandwidth is based on the use of measurement instrumentation 
employing a peak detector function with an instrument resolution bandwidth approximately equal to 
1 % of the emission bandwidth of the device under measurement.  
4.11.2.2  MedR adio communications session: is a collection of transmissions that may or may not be 
continuous, between co -operating MedRadio  devices and accessories.  
4.11.2.3  MedRadio channel : is any continuous segment of spectrum that is equal to the emission 
bandwidth of the d evice with the largest bandwidth that is to participate in a MedRadio  
communications session.  
4.11.3  Requirement of MedRadio programmer/control transmitter:  
4.11.3.1  For frequency monitoring: Before the medical programmer/control transmitter begins  the 
MedRadio communicat ion session, the following conditions must be adhered to : 
(1)  The 20 dB bandwidth of the monitoring system must be greater than or equal to the wanted 
emission bandwidth.  
(2)  Within 5 seconds prior to initiating a communications session, the MedRadio must monitor the 
channel or channels the MedRadio system devices intend to occupy for a minimum of 10  
-  - 40milliseconds per channel.  
(3)  Based on use of an isotropic monitoring system antenna, the monitoring threshold power level 
(PTh) must be less than or equal to 10 logB (Hz)  - 150 (dBm/Hz) + G (dBi) where B is the 
emission bandwidth of the MedRadio communication session transmitter having the widest 
emission and G is the programmer/control transmitter monitoring system antenna gain relative 
to an isotropic antenna. If using a  non-isotropic monitoring system antenna, the monitoring 
threshold power level shall be modified.  
(4)  If no signal in a MedRadio channel above the monitoring threshold power level is detected, the 
MedRadio programmer/control transmitter may initiate a MedRadio -communications session. 
The MedRadio communications session may continue as long as any silent period between 
consecutive data transmission bursts does not exceed 5 seconds. If a channel confirmed with 
the signals is higher than the monitoring threshold l evel, MedRadio transmitters shall cease  
the emission. The MedRadio transmitters that are capable of operating on multiple channels 
shall be applied as well. The device with the lowest monitored ambient power level must be 
changed to continue the communicat ion sessions.  
(5)  When a channel is selected prior to a MedRadio communications session, it is permissible to 
select an alternate channel for use if communications are interrupted, provided that the 
alternate channel selected is the next best choice using the above criteria. The alternate 
channel may be accessed in the event a communications session is interrupted by 
interference. The following criteria must be met:  
(A) Before transmitting on the alternate channel, the channel must be monitored for a 
period of at l east 10 milliseconds.  
(B) The detected power level during this 10 milliseconds or greater monitoring period must 
be no higher than 6  dB above the power level detected when the channel has been 
selected  as the alternate channel.  
(C) In the event that this alternate  channel provision is not used by the MedRadio system or 
if the criteria in paragraphs (A) and (B) are not met, a channel must be selected using 
the access criteria specified in 4.11.3.1(1)~(4).  
4.11.3.2  MedRadio programmer/control transmitter shall be a mechanism to monitor frequency, and 
the communication session is started by the implant medical device operating under monitoring 
(including the monitoring channel or channel used by MedRadio), but the device or the 
communication session that meets one of the follow ing conditions will not be limited here:  
(1)  MedRadio devices operating in either the 401 MHz~401.85 MHz or 405 MHz~406 MHz bands, 
provided that the transmit power shall be less than or equal to 250 nW EIRP and the duty 
cycle for such transmissions need to be less than or equal to 0.1  %, based on the total 
transmission time during a one -hour interval, and a maximum of 100 transmissions per hour.  
(2)  MedRadio devices operating in the 401.85 MHz~402 MHz band, provided that the transmit 
power shall be less than or equ al to 25 uW EIRP and the duty cycle for such transmissions 
need to be less than or equal to 0.1  %, based on the total transmission time during a one hour 
interval, and a maximum of 100 transmissions per hour.  
(3)  MedRadio devices operating with a total emissio n bandwidth not exceeding 300 kHz centered 
at 403.5 MHz~403.8 MHz, provided that the duty cycle for such transmissions need to be less 
than or equal to 0.01  %, based on the total transmission time during a one -hour interval, and a 
maximum of 10 transmissio ns per hour.  
4.11.3.3  The measurement procedures to monitor MedRadio frequency shall refer to the requirement 
of ETSI EN 301 839 -1, ETSI EN 302 537 -1 or FCC 47CFR Part 95.627.  
4.11.4  Operation band for MedRadio Station:  
4.11.4.1  MedRadio Station is an associated device to connect to the medical radio transmitter.  
4.11.4.2  MedRadio Station associated with medical implant devices and meeting 4.11.3.1 must use 
any frequencies in the 401 MHz~406 MHz band.   
-  - 414.11.4.3  MedRadio Station associated with medical implant devices but not meeting 4.11.3.1 must 
only use any frequencies in the 401 MHz~402 MHz and 405 MHz~406 MHz bands or 403.65 MHz 
in the 402 MHz~405 MHz band.  
4.11.4.4  MedRadio Station associated with body -worn medical devices and using frequency 
monitoring in 4.11.3.1 can operate any frequencies in the 401 M Hz~402 MHz or 405 MHz~406 
MHz band.  
4.11.4.5  MedRadio Station associated with multiple permanent implant medical devices and using 
frequency monitoring in 4.11.3.1 can operate any frequenc ies in the 402 MHz~405 MHz band : 
(1)  The maximum output power of the temporary bo dy-worn device needs to be less than 200 nW 
EIRP; and  
(2)  The temporary body -worn device must comply fully with all other MedRadio rules applicable 
with medical implant device operation in the 402 MHz~405 MHz band.  
4.11.5  Emission bandwidth:  
4.11.5.1  For MedRadio operating in  the 402 MHz~405 MHz band, the maximum emission bandwidth 
is 300 kHz. The total bandwidth used in communication session shall be less than or equal to 300 
kHz. 
4.11.5.2  For MedRadio operating in the 401 MHz~401.85 MHz or 405 MHz~406 MHz band, the 
maximum emission b andwidth is 100 kHz. The total bandwidth used in communication session 
shall be less than or equal to 100 kHz.  
4.11.5.3  For MedRadio operating in the 401.85 MHz~402 MHz band, the maximum emission 
bandwidth is 150 kHz. The total bandwidth used in communication sessi on shall be less than or 
equal to 150 kHz.  
4.11.5.4  For MedRadio operating in the 402 MHz~405 MHz band, the total amount of bandwidth 
utilized by a channel shall be less than or equal to 300 kHz. For MedRadio operating in the 401 
MHz~402 MHz and 405 MHz~406 MHz ban ds, the total amount of bandwidth utilized by a channel 
shall be less than or equal to 100 kHz. Full duplex or half duplex communications shall be adopted . 
4.11.6  For the EIRP, limits are summarized in Table 1:  
4.11.6.1  The maximum emission power by a MedRadio transmitter  operating in the 402 MHz~405 
MHz band in any 300 kHz bandwidth or the 401 MHz~402 MHz or 405 MHz~406 MHz band in any 
100 kHz bandwidth in compliance with 4.11.3.1 shall be less than or equal to 25 uW EIRP.  
4.11.6.2  The maximum emission power by a MedRadio transmit ter operating in the 403.5 MHz~403.8 
MHz band in compliance with 4.11.3.2(3) shall be less than or equal to 100 nW EIRP.  
4.11.6.3  The power radiated by a MedRadio transmitter operating in the 401 MHz~401.85 MHz or 405 
MHz~406 MHz band in compliance with 4.11.3.2(1)  shall be less than or equal to 250 nW EIRP in 
any 100 kHz bandwidth.  
4.11.6.4  The power radiated by a MedRadio transmitter operating in the 401.85 MHz~402 MHz band 
in compliance with 4.11.3.2(2) shall be less than or equal to 25 uW EIRP in any 150 kHz bandwidth.  
4.11.6.5  The EIRP measurements may be determined by connecting the MedRadio transmitter to the 
antenna and measuring the radiated field from the equipment under test at 3 meters and calculating 
the EIRP. The equivalent radiated field strength at 3 meters for 25 uW, 250 nW, 100 nW EIRP is 
18.2 mV/m, 1.8 mV/m, 1.2 mV/m, respectively, when measured on an open area test site; or 9.1 
mV/m, 0.9 mV/m, 0.6 mV/m, respectively, when measured on a test site equivalent to free space 
such as a fully anechoic test chamber.  
4.11.6.6  Complia nce with the maximum transmitter power requirements set forth shall be based on 
measurements using a peak detector function and measured over an interval of time when 
transmission is continuous and at its maximum power level.  
Table 1  
 Monitoring  No monitor ing 
Operating 
frequency band  BW EIRP  BW EIRP  Operating condition  
Duty cycle  Times  
Per hour  
401~401.85  100 kHz  25 uW  100 kHz  250 nW  0.1 % 100  
-  - 42( 3.6 s/hr)  
401.85~402  100 kHz  25 uW  150 kHz  25 uW  0.1 % 
( 3.6 s/hr)  100 
402~403.5  300 kHz  25 uW  ---- ---- ----------  ----- 
403.5~403.8  300 kHz  25 uW  300 kHz  100 nW  0.01 % 
( 360 ms/hr)  10 
403.8~405  300 kHz  25 uW  ---- ---- ----------  ----- 
405~406  100 kHz  25 uW  100 kHz  250 nW  0.1 % 
( 3.6 s/hr)  100 
 
4.11.7  Unwanted emission:  
4.11.7.1  The unwanted emission power must be les s than the fundamental emission power . 
4.11.7.2  The field strength in the following circumstance shall conform to the requirement s in Section 
2.8. 
(1)  MedRadio operating in the band 402 MHz~405 MHz that is more than 250 kHz away from the 
402 MHz~405 MHz band.  
(2)  MedRadio operating in the band 401 MHz~402 MHz or 405 MHz~406 MHz that is more than 
100 kHz in the 406 MHz~406.1 MHz band and away from the bands 401 MHz~402 MHz and 
405 MHz~406 MHz.  
4.11.7.3  For MedRadio operating in the band 402 MHz~405 MHz that is more than 150 kHz away 
from the center frequency of the transmission, the emission power shall be attenuated below the 
maximum permitted output power over 20 dB.  
4.11.7.4  MedRadio operating in the band 401 MHz~402 MHz or 405 MHz~406 MHz that is more than 
50 kHz away from the center frequ ency of the transmission; for MedRadio operating in the band 
401.85 MHz~402 MHz that is more than 75 kHz away from the center frequency of the transmission, 
the emission power shall be attenuated below the maximum permitted output power over 20 dB.  
4.11.7.5  The emi ssion powers in Section 4.11.7.3 and Section 4.11.7.4 are based on the use of 
measurement instrumentation employing a peak detector function with an instrument resolution 
bandwidth approximately equal to 1  % of the emission bandwidth of the device under 
measurement.  
4.11.8  Frequency tolerance: Each transmitter in the MICS service must maintain a frequency stability 
of ±100 ppm of the operating frequency over the range: 25  ℃~45 ℃ in the case of medical 
implant transmitters; and 0  ℃~55 ℃ in the case of medical implant programmer/control and 
body -worn transmitters.  
4.11.9  Measurement requirements on implant transmitters:  
4.11.9.1  For a transmitter intended to be implanted in a human body, the  following test fixture must be 
used to simulate operation of the implant under actual operating conditions.  
4.11.9.2  For measurement purposes to determine compliance with emission limits, the radiating 
characteristics of an implant transmitter placed in a test fix ture should approximate those of an 
implant transmitter placed in a human body. An appropriate human torso simulator for testing 
medical implant transmitters consists of a cylindrical Plexiglas container with a size of 30±0.5 cm by 
76±0.5 cm with a sidewal l thickness of 0.6±0.21 cm. It must be completely filled with a material that 
is sufficiently fluidic that it will flow around the implant without any voids, but not including th e saline. 
The dielectric and conductivity properties of this material must mat ch the dielectric and conductivity 
properties of human muscle tissue at 403.5 MHz. All emissions measurements will be made using 
the above specification at a nominal temperature of 22  ℃~38 ℃. A stand for the implant inside the 
container must be provided that permits the radiating element or elements of the implant to be 
positioned vertically and horizontally. The implant transmitter shall be vertically placed in the 
container, and the a ntenna shall be mounted 6±0.5 cm from the sidewall. If it is horizontally set up, 
the antenna shall be readjusted to keep 6±0.5 cm from the sidewall. The above fixture shall be 
placed on a turntable such that the implant transmitter will be located at a no minal 1.5 -meter height 
above ground and at a 3 -meter distance from the measurement antenna. The above fixture shall be 
placed on a turntable such that the implant transmitter will be located at a nominal 1.5 -meter height  
-  - 43above ground and at a 3 -meter dista nce from the measurement antenna . 
4.11.9.3  A formula for a suitable tissue substitute material refers to FCC 95.627 or ETSI EN 301839 -1, 
ETSI EN 302537 -1. 
4.11.10  Programmer/control receiver: shall conform to  the regulations in Section 2.8.  
4.11.11  Programmer/control devices using  AC power line shall conform to the  limits of power -line 
conducted emissions in Section 2.3.  
4.11.12  The MedRadio Station can send any emission type that applies to non -voice communication 
service.  
4.12 Ultra -wideband Devices:  
4.12.1  Frequency bands: 4.224 GHz~4.752 GHz, 6.33 6 GHz~7.920 GHz, 7.392 GHz~8.976 GHz.  
4.12.2  Terminology:  
4.12.2.1  UWB bandwidth: For the purpose of this subpart, the UWB bandwidth is the frequency band 
bounded by the points that are 10 dB below the highest radiated emission, as based on the 
complete transmission syste m (including the antenna). The upper boundary is designated f H and 
the lower boundary is designated f L. The frequency at which the highest radiated emission occurs is 
designated f M. 
4.12.2.2  Center frequency: Central frequency f C is equal to (f H+fL)/2. 
4.12.2.3  Fractional b andwidth: Fractional bandwidth is equal to 2 (f H-fL) / (f H+fL). 
4.12.2.4  Ultra -wideband transmitter): An intentional radiator that, at any point in time, has a fractional 
bandwidth greater than 0.20 or has a UWB bandwidth greater than 500 MHz, regardless of the 
fractional bandwidth.  
4.12.2.5  Medical imaging system: A field disturbance sensor that is designed to detect the location or 
movement of objects within the body of a person or animal.  
4.12.2.6  Hand held device: A hand held device is a portable device, such as a lap top compute r or a 
PDA 
4.12.3  Device type:  
4.12.3.1  Medical imaging systems  
(1)  Radiated emissions:  
(A) The radiated emissions below 960 MHz from a device operating under the provisions of 
this section shall conform to  the emission levels in Section 2.8.  
(B) Radiated emissions above 960 MHz from  a device operating under the provisions of 
this section shall be less than or equal to the following average limits when measured 
using a resolution bandwidth of 1 MHz:  
Frequency  
(MHz)  EIRP  
(dBm)  
960~1610  -65.3 
1610~1990  -53.3 
1990~4224  -51.3 
4224~475 2 -41.3 
4752~6336  -51.3 
6336~8976  -41.3 
Over 8976  -51.3 
Note: The tighter limit applies at the band 
overlap.  
  
-  - 44(C) Radiated emission from GPS band: In addition to the radiated emission limits specified 
in the table in paragraph (A) and (B) of this section,  UWB transmitters operating under 
the provisions of this section shall be less than or equal to the following average limits 
when measured using a resolution bandwidth over 1 kHz:  
frequency  
(MHz)  EIRP  
(dBm)  
1164〜1240  -75.3 
1559〜1610  -75.3 
 
(2)  Peak radiated emission limit: Within a 50 MHz bandwidth centered on the frequency at which 
the highest radiated emission occurs, f M, the peak emission limit is 0 dBm EIRP. It is 
acceptable to employ a different resolution ban dwidth, and a correspondingly different peak 
emission limit, following the procedures stipulated  in 4.12.4.6.  
(3)  A medical imaging system shall contain a manually operated switch or a remote emergency 
switch that causes the transmitter to cease operation with in 10 seconds of being released by 
the operator.  
4.12.3.2  Indoor UWB systems:  
(1)  Radiated emissions:  
(A) The radiated emissions at or below 960 MHz from a device operating under the 
provisions of this section shall conform to  the emission levels in Section 2.8.  
(B) The radiat ed emissions above 960 MHz from a device operating under the provisions of 
this section shall be less than or equal to the following average limits when measured 
using a resolution bandwidth of 1 MHz:  
frequency  
(MHz)  EIRP  
(dBm)  
960〜1610  -75.3 
1610〜1990  -53.3 
1990〜4224  -51.3 
4224〜4752  -41.3 
4752〜6336  -51.3 
6336〜8976  -41.3 
8976以上 -51.3 
Note: The tighter limit applies 
at the band overlap.  
(C) Radiated emission from GPS band: In addition to the radiated emission limits specified 
in the table in paragraph ( A) and (B) of this section, UWB transmitters operating under 
the provisions of this section shall be less than or equal to the following average limits 
when measured using a resolution bandwidth over 1 kHz:  
frequency  
(MHz)  EIRP  
(dBm)  
1164〜1240  -85.3 
1559〜1610  -85.3 
 
(2)  Peak radiated emission limit: Within a 50 MHz bandwidth centered on the frequency at which 
the highest radiated emission occurs, f M, the peak emission limit is 0 dBm EIRP. It is 
acceptable to employ a different resolution bandwidth, and a cor respondingly different peak 
emission limit, following the procedures described in 4.12.4.6.  
(3)  Others:  
(A) For indoor access.  
(B) The emissions from equipment operated under this section shall not be intentionally  
-  - 45directed outside of the building in which the equipme nt is located (such as through a 
window or a doorway, to perform an outside function, such as the detection of persons 
about to enter a building).  
(C) The use of outdoor mounted antennas, e.g., antennas mounted on the outside of a 
building or on a telephone po le, or any other outdoors infrastructure is prohibited.  
(D) Field disturbance sensors installed inside of metal or underground storage tanks are 
considered to operate indoors provided the emissions are directed towards the ground.  
(E) A communications system shall  transmit only when the intentional radiator is sending 
information to an associated receiver.  
(F) The UWB systems shall label the following or similar descriptions: “this device used for 
indoor only” at the obvious place where the device is installed or in th e attached 
operation manual.  
4.12.3.3  Hand held UWB systems  
(1)  Radiated emission:  
(A) The radiated emissions at or below 960 MHz from a device operating under the 
provisions of this section shall meet the emission levels in Section 2.8.  
(B) The radiated emissions above 960 MH z from a device operating under the provisions of 
this section shall be less than or equal to the following average limits when measured 
using a resolution bandwidth of 1 MHz:  
Frequency  
(MHz)  EIRP  
(dBm)  
960〜1610  -75.3 
1610〜1990  -63.3 
1990〜4224  -61.3 
4224〜4752  -41.3 
4752〜6336  -61.3 
6336〜8976  -41.3 
8976以上 -61.3 
Note: The tighter limit applies 
at the band overlap.  
 
(C) Radiated emission from the GPS band: In addition to the radiated emission limits 
specifie d in the table in paragraph (A) and (B) of this section, UWB transmitters 
operating under the provisions of this section shall be less than or equal to the following 
average limits when measured using a resolution bandwidth over 1 kHz:  
frequency  
(MHz)  EIRP  
(dBm)  
1164〜1240  -85.3 
1559〜1610  -85.3 
 
(2)  Peak radiated emission limit: Within a 50 MHz bandwidth centered on the frequency at which 
the highest radiated emission occurs, f M, the peak emission limit is 0 dBm EIRP. It is 
acceptable to employ a different resolution ban dwidth, and a correspondingly different peak 
emission limit, following the procedures described in 4.12.4.6.  
(3)  Others:  
(A) UWB devices operating under the provisions of this section must be hand held, i.e., they 
are relatively small devices that are primarily ha nd held while being operated and do not 
employ a fixed infrastructure.  
(B) A UWB device operating under the provisions of this section shall transmit only when it 
is sending information to an associated receiver. The UWB intentional radiator shall 
cease transm ission within 10 seconds unless it receives an acknowledgement from the 
associated receiver that its transmission is being received.   
-  - 464.12.4  Other rules:  
4.12.4.1  UWB devices must not be employed for the operation of toys. Operation onboard an aircraft, 
a ship or a satelli te is prohibited.  
4.12.4.2  The operation of the antenna shall conform to  the regulations in Section 2.2.  
4.12.4.3  If emissions from digital circuitry of UWB transmitter can be specified other than the emission 
from the antenna, the emissions shall conform to  the regulations  in Section 2.8. Emissions from 
associated digital devices shall be the same.  
4.12.4.4  Within the tables in 4.12.3.1, 4.12.3.2, and 4.12.3.3, the tighter emission limit applies at the 
band edges. Radiated emission levels at and below 960 MHz are based on measuremen ts 
employing a CISPR quasi -peak detector. Radiated emission levels above 960 MHz are based on 
RMS average measurements over a 1 MHz resolution bandwidth. The RMS average measurement 
is based on the use of a spectrum analyzer with a resolution bandwidth of 1 MHz, an RMS detector, 
and a 1 millisecond or less (inclusive) averaging time.  
4.12.4.5  The frequency at which the highest radiated emission occurs, f M, must be contained within 
the UWB bandwidth.  
4.12.4.6  The measurement shall be centered on the frequency at which the hig hest radiated emission 
occurs, f M. If a resolution bandwidth among 1 MHz~50 MHz is employed, the peak EIRP limit shall 
be 20 log (RBW/50) dBm. This may be converted to a peak field strength level at 3 meters using 
(dBuV/m) = P(dBm EIRP) + 95.2.  
4.12.4.7  The highest  frequency employed in Section 5.14 to determine the measurement range of the 
unnecessary emission e shall be based on the center frequency, f C. 
4.12.4.8  The UWB devices shall not be applied to the requirement of Section 2.4.  
4.12.4.9  Unless specified in 4.12, the UWB devic es shall not be applied to the requirement of Section 
5.1.5.3.  
 
 
 
 
 
 
 
 
  
-  - 475 Inspection rules  
5.1 For swept frequency equipment, measurements shall be made with the frequency sweep stopped at 
those frequencies chosen for the measurements to be reported.  
5.2 Measur ements of radio frequency emissions conducted on public utility power lines shall be 
undertaken  using a 50 ohm/50 uH line impedance stabilization network (LISN).  
5.3 Field strength measurements shall be made, to the extent possible, on an open field site. Test sites 
other than open field sites may be employed if they are properly calibrated so that the measurement 
results correspond to what would be obtained from an open field site.  In the case of equipment for 
which measurements can be undertaken  only at t he installation site,  such as perimeter protection 
systems, carrier current systems, and systems employing a "leaky" coaxial cable as an antenna, 
measurements for verification or for obtaining a grant of equipment authorization shall be performed  at 
a mini mum of three installations that can be demonstrated to be representative of typical installation 
sites.  
5.4 For intentional radiators, measurements of the variation of the input power or the radiated signal l evel 
of the fundamental frequency component of t he emission, as appropriate, shall be undertaken  with the 
supply voltage varied 15% of the nominal rated supply voltage. For battery operated equipment, the 
equipment tests shall be undertaken  using a new battery. A preliminary measurement shall be 
undert aken  to determine the configuration and condition that produces the highest emission for the 
final measurement as follows:  
5.4.1  EUT powered from both AC and DC (battery) power, if the device has th is capability.  
5.4.2  EUT supplied with the appropriate modulation and without modulation, if the modulation of 
carrier can be controlled.  
5.4.3  For hand -held or body -worn devices, the EUT shall be rotated through three orthogonal axes.  
5.5 To the extent possi ble, the device under test shall be measured at the distance specified in  the 
appropriate rule section.  The distance specified corresponds to the horizontal distance between the 
measurement antenna and the closest point of the equipment under test, support equipment or 
interconnecting c ables as determined by the boundary define d by an imaginary straight line periphery 
describing a simple geometric configuration enclosing the system containing the equipment under test . 
The equipment under test, support equipment and any interconnecting cables shall be included within 
this boundar y. 
5.5.1  At frequencies at or above 30 MHz, measurements may be undertaken  at a distance other than 
what is specified provided measurements are not made in the near field except where it can be 
shown that near field measurements are appropriate due to the charac teristics of the device; 
and it can be demonstrated that the signal levels needed to be measured at the distance 
employed can be detected by the measurement equipment. Measurements shall not be 
undertaken  at a distance greater than 30 meters unless it can be further demonstrated that 
measurements at a distance of 30 meters or less are impractical. When undertaking  
measurements at a distance other than that specified, the results shall be extrapolated to the 
specified distance using an extrapolation factor o f 20dB/decade (inverse linear -distance for field 
strength measurements; inverse -linear -distance -squared for power density measurements).  
5.5.2  At frequencies below 30 MHz, measurements may be undertaken  at a distance closer than that 
specified in the regulations ; however, an attempt should be made to avoid making 
measurements in the near field.  When performing measurements at a closer distance than 
specified, the results shall be extrapolated to the specified distance  by either making 
measurements at a minimum of  two distances on at least one radial to determine the proper 
extrapolation factor or by using the square of an inverse linear distance extrapolation factor (40 
dB/decade).  
5.5.3  When the measurement distance is other than the distance specified, t he measurement  report 
shall indicate the extrapolation method used during the measurement.  
5.5.4  Measurements shall be undertaken  at a sufficient number of radials around the equipment 
under test to determine the radial at which the field strength values of the radiated emiss ions are 
maximized. The maximum field strength at the frequency being measured shall be recorded and  
-  - 48reported.  
5.6 Equipment under test shall be adjusted, using those controls that are readily accessible to or are 
intended to be accessible to the consumer,  in such a manner as to maximize the level of the emissions. 
For those devices to which cable  may be attached by the consumer, tests shall be performed with 
cable  attached. The cable  shall be of the length to be used with the equipment if that length is kn own. 
Otherwise, cable  one meter in length shall be attached to the equipment. Longer cable  may be 
employed if necessary to interconnect to associated peripherals.  
5.6.1  For tabletop EUT, the requirements for configuration of power -line conducted emission test is  as 
follow s: 
5.6.1.1  If interconnecting cables between devices hang less than 40cm to the ground plane, the rest 
should be folded forming a bundle 30 to 40  cm long and tied in the middle, so that the lowest point 
of the cable is in the middle between the test tabl e and the ground plane.  
5.6.1.2  I/O cable not connected to a peripheral shall be bundled in center to keep the cable away 
from the grounding surface by 40 cm approximately. The end of the cable shall be terminated with 
correct terminating impedance.  
5.6.1.3  LISN at least 80 cm from nearest part of EUT chassis. The excess power cord of EUT shall 
be bundled close to the center of the cord. Non -EUT equipment needs not to be bundled.  
5.6.1.4  Rear of EUT, including peripherals, shall be all aligned and flush with rear of tabletop. Rear  of 
tabletop shall be 40  cm removed from the vertical conducting plane.  
5.6.2  For floor -standing EUT, the requirements for configuration of power -line conducted emission 
test is as follow s: 
5.6.2.1  Excess interconnecting cable shall be bundled in center and the bundling  shall not exceed 40  
cm. 
5.6.2.2  LISN is 80  cm from nearest part of EUT chassis. The excess power cord of EUT and 
peripherals shall be bundled in center to appropriate length.  
5.6.2.3  I/O c able that are not connected to a peripheral shall be bundled in center. The end of the 
cable shall be terminated with correct terminating impedance.  
5.6.2.4  EUT and all cables shall be insulated from ground plane by 3 mm~12 mm of insulating 
material.  
5.6.3  For tabletop EUT, the requirements for configuration of radiated emission test is as follow s: 
5.6.3.1  If interconnecting cables between devices hang less than 40cm to the ground plane, the rest 
should be folded forming a bundle 30  cm to 40  cm long and tied in the middle, so that the lowest 
point of the cable is in the middle between the test table and the gr ound plane.  
5.6.3.2  I/O cable not connected to a peripheral shall be bundled in center to keep the cable away 
from the grounding surface by 40 cm approximately. The end of the cable may be terminated if 
required using correct terminating impedance.  
5.6.3.3  Rear of EUT, in cluding peripherals, shall be all aligned and flush with rear of tabletop.  
5.6.3.4  The power cords of EUT and peripheral drape to the floor and are not required to be bundled.  
5.6.4  For floor -standing EUT, the requirements for configuration of radiated emission test is as 
follow s: 
5.6.4.1  Excess interconnecting cable shall be bundled in center and the bundling shall not exceed 40  
cm. 
5.6.4.2  The excess power cord of EUT and peripherals shall be bundled in center to appropriate 
length.  
5.6.4.3  I/O cable s that are not connected to a peripheral sh all be bundled in center. The end of the 
cable shall be terminated with correct terminating impedance.  
5.6.4.4  EUT and all cables shall be insulated from ground plane by 3 mm~12 mm of insulating 
material.  
5.7 For a composite system that incorporates devices contained either in a single enclosure or in separate 
enclosures connected by wire or cable, testing for compliance with the standards shall be undertaken   
-  - 49with all of the devices in the system functioning.  If an intentional radiator incorporates more than one 
antenn a or other radiating source and these radiating sources are designed to emit at the same time, 
measurements of conducted and radiated emissions shall be undertaken  with all radiating sources that 
are to be employed emitting.  A device which incorporates a c arrier current system shall be tested for 
compliance with whatever rules would apply to the device.  
5.8 If the device under test provides for the connection of externa l accessories, including external electrical 
input signals, the device shall be tested with t he accessories attached. The device under test shall be 
fully exercised with these external accessories. The emission tests shall be undertaken  with the device 
and accessories configured in a manner that tends to produce maximized emissions within the rang e 
of variations that can be expected under normal operating conditions.  Only one test using peripherals 
or external accessories that are representative of the devices that will be employed with the equipm ent 
under test is required.  All possible equipment c ombinations do not need to be tested.  The accessories 
or peripherals connected to the device being tested shall be unmodified, commercially available 
equipment.  
5.9 If the equipment under test consists of a central control unit and an external or internal acce ssory(ies) 
(peripheral) and the party verifying the equipment or applying for a grant of equipment authorizatio n 
manufactures or assembles the central control unit and at least one of the accessory devices that ca n 
be used with that control unit, testing o f the control unit and/or the accessory(ies) must be undertaken  
using the devices manufactured or assembled by that party,  excluding any other needed devices which 
the party does not manufacture or assemble.  If the party verifying the equipment or applying  for a grant 
of equipment authorization does not manufacture or assemble the central control unit and at least on e 
of the accessory devices that can be used with that control unit or the party can demonstrate that t he 
central control unit or accessory(ies)  normally would be marketed or used with equipment from a 
different entity, testing of the central control unit and/or the accessory(ies) must be performed us ing the 
specific combination of equipment which is intended to be marketed or used together.  Only one test 
using peripherals or external accessories that are representative of the devices that will be employ ed 
with the equipment under test is required.  All possible equipment combinations do not need to be 
tested.  The accessories or peripherals connecte d to the device being tested shall be unmodified, 
commercially available equipment.  
5.10 If the individual devices in a composite system are subject to different technical standards, each s uch 
device must comply with its specific standards.  In no event may the measured emissions of the 
composite system exceed the highest level permitted for an individual component.  
5.11 Modular transmitter:  In order to be considered a modular transmitter, the device must be a complete 
RF transmitter, and can be installed on different  platforms.  
The modular transmitter shall conform to  the following requirements:  
5.11.1  The modular transmitter must have its own RF shielding.  
5.11.2  The modular transmitter must have buffer for modulation/data inputs, if such inputs are 
provided.  
5.11.3  The modular transmitt er must have its own power supply regulation.  
5.11.4  The modular transmitter must comply with the antenna requirements of Section 2.2. Any 
antenna used with the module, with specifications presented, must be tested under maximum 
output power and maximum gain of t he transmitter.  
5.11.5  The modular transmitter must not be inside another device during testing. It can be installed on 
an extending fixture.  
5.11.5.1  DC or AC power lines and data input/output lines connected to the module must not contain 
ferrites, unless they will be m arketed with the module and instructions.  
5.11.5.2  Length of these lines shall be length typical of actual use or, if that length is unknown, at least 
10cm.  
5.11.5.3  Any accessories, testing fixture, peripherals, or support equipment connected to the module 
during testing s hall not be modified.  
5.12 Measurements on intentional radiators or receivers, shall be performed and, if required, reported fo r 
each band in which the device can be operated with the device operating at the number of frequencies  
in each band specified in the f ollowing table:   
-  - 50Frequency range over 
which device operates  Number of 
frequencies  Location in the range of operation  
1Mhz or less  1 Middle  
1-10 MHz  2 One near the top and the other near the bottom  
More than 10  MHz 3 One near the top, one near the bottom and another 
near the center  
 
5.13 The amplitude of spurious emissions that are attenuated more than 20  dB below the permissible value 
need not be reported unless specifically required elsewhere in this standard.  
5.14 Frequency measurement range:  
5.14.1  The spectrum shall be measured from the lowest radio frequency signal generated in the device 
(without going below 9 kHz), and the upper limit of the measurement range shall be decided 
according to the maximum operating frequency . 
5.14.1.1  Maximum operating frequency less than 10 GHz : to the tenth harmonic of the highest 
fundamental frequency or to 40 GHz, whichever is lower.  
5.14.1.2  Maximum operating frequency between 10 GHz~30 GHz: to the fifth harmonic of the highest 
fundamental frequency or to 100 GHz, whichever is lower.  
5.14.1.3  Maximum operatin g frequency over 30 GHz: to the fifth harmonic of the highest fundamental 
frequency or to 200 GHz, whichever is lower.  
5.14.2  Particular  attention should be paid to harmonics and subharmonics  of the carrier frequency as 
well as to those frequencies removed from t he carrier by multiples of the oscillator frequency.  
Radiation at the frequencies of multiplier stages should also be checked.  
5.15 Specifications of measuring equipment:  The conducted and radiated emission limits shown in this rule 
are based on the following, unless otherwise specified elsewhere in this rule.  
5.15.1  On any frequency or frequencies below or equal to 1000  MHz, the limits shown are based on 
measuring equipment employing a CISPR quasi -peak detector function and related 
measurement bandwidths, unless other wise specified. The specifications for the measuring 
instrument using  the CISPR quasi -peak detector can be found in Publication 16 of the 
International Special Committee on Radio Interference (CISPR) of the International Electro  
technical Commission. As an  alternative to CISPR quasi -peak measurements, the responsible 
party, at its option, may demonstrate compliance with the emission limits using measuring 
equipment employing a peak detector function, properly adjusted for such factors as pulse 
desensitizati on, as long as the same bandwidths as indicated for CISPR quasi -peak 
measurements are employed.  
Note: For pulse modulated devices with a pulse -repetition frequency less than or equal of 20 Hz and for 
which CISPR quasi -peak measurements are specified, compl iance with the regulations shall be 
demonstrated using measuring equipment employing a peak detector function, properly adjusted 
for such factors as pulse desensitization, using the same measurement bandwidths that are 
indicated for CISPR quasi -peak measur ements.  
5.15.2  On any frequency of frequencies above 1000  MHz, the radiated limits shown are based upon 
the use of measurement instrumentation employing an average detector function. When 
average radiated emission measurements are specified in the regulations (in cluding emission 
measurements below 1000  MHz), there is also a limit on the radio frequency emissions, as 
measured using instrumentation with a peak detector function, corresponding to 20  dB above 
the maximum permitted average limit for the frequency being  investigated unless a different 
peak emission limit is otherwise specified in the rules. Unless otherwise specified, 
measurements above 1000  MHz shall be undertaken  using a minimum resolution bandwidth of 
1MHz.  
5.15.3  Unless otherwise specified, when the radiate d emission limits are expressed in terms of the  
-  - 51average value of the emission, and pulsed operation is employed, the measurement field 
strength shall be determined by averaging over one complete pulse train, including blanking 
intervals, as long as the pul se train does not  exceed 0.1 seconds. As an alternative (provided 
the transmitter operates for longer than 0.1 seconds) or in cases where the pulse train exceeds 
0.1 seconds, the measured field strength shall be determined from the average absolute voltage  
during a 0.1 second interval during which the field strength is at its maximum value. The exact 
method of calculating the average field strength shall be submitted with the test report.  
5.16 Modulation applied: Unless specified in the individual test instructi ons or when modulation is needed to 
produce a transmitted signal (e.g. single -sideband suppressed carrier transmitters), modulation does 
not need to be applied during testing. When modulation is specified in individual tests, the followi ng 
provisions can b e applied:  
5.16.1  For voice -only modulated devices (200 Hz~3000  Hz) except cordless telephones, a 1000  Hz 
sine wave at 100  dB SPL (0  dB SPL is 20  μPa) shall be applied 10  cm from the microphone.  
5.16.2  If the EUT is modulated from internal sources, then the internal sou rces shall be applied.  
5.16.3  If the EUT is equipped with input terminals for external modulation, modulating signals of sine 
wave shall be applied at the maximum rated level and appropriate frequency.  
5.17 Unless the operation of EUT requires different range, the amb ient temperature and humidity shall be 
within the range of 10  °C to 40 °C and 10  % to 90  % respectively.  
5.18 Battery Operating End Point Voltage : For battery operated only device, the frequency stability shall be 
measured supplying the EUT primary voltage at t he battery operating end point that is specified by the 
manufacturer and record the frequency.  
5.19 Frequency response: if measurement of frequency response is specified in individual provision, the 
test data should cover a range of 100  Hz~5000  Hz. 
5.20 RF exposure assessment:  If RF Exposure Assessment is required in the regulation , the requirements 
are as following : 
5.20.1  For purposes of RF exposure assessment requirements, Specific Absorption Rate (SAR) shall 
be measured as transmitters whose radiating structures are des igned to be used within 20 
centimeters of the body of the user. Limits are as follows:  
Position  Occupational/Controlled 
Exposure (W/kg)  General Population/Uncontrolled 
Exposure (W/kg)  
Whole -Body  0.4 0.08 
Partial -Body  8.0 1.6 
Hands, Wrists, Feet and 
Ankles 20.0 4.0 
 
Note 1: Whole -Body SAR is averaged over the entire body, partial -body SAR is averaged over any 1 
gram of tissue defined as a tissue volume in the shape of a cube. SAR for hands, wrists, feet 
and ankles is averaged over any 10 grams of tissue defined as a tissue volume in the shape of 
a cube.  
Note 2: At frequencies above 6.0  GHz, SAR limits are not applicable and MPE limits for power density 
should be applied at 5  cm or more from the transmitting device.  
 
5.20.2  For purposes of RF exposure assessment requirements, Maximum Permissible Exposure (MPE) 
shall be measured, if separation distance of at least 20 centimeters is normally maintained 
between radiating structures and the body of the user or nearby persons. Limits are as follows:  
5.20.2.1  Limits fo r Occupati onal/Contr olled Exposure  
 
Frequency Range 
(MHz)  Electric Field 
Strength (V/m)  Magnetic Field 
Strength (A/m)  Power Density 
(mW/cm2) Averaging Time 
(minutes)  
0.3-3.0 614 1.63 *100 6  
-  - 523-30 1842/f  4.89/f  *900/f2 6 
30-300 61.4 0.163  1.0 6 
300-1,500  ----- ----- f/300  6 
1,500-100,000  ----- ----- 5.0 6 
 
Note 1: asterisk (*) is plane -wave equivalent power density.  
Note 2: f is the testing frequency in MHz.  
 
5.20.2.2  Limits for General Population/Uncontrolled Exposure  
 
Frequency Range 
(MHz)  Electric Field 
Strength (V/m)  Magnetic Field 
Strength (A/m)  Power Density 
(mW/cm2) Averaging Time 
(minutes)  
0.3-1.34 614 1.63 *100 30 
1.34-30 824/f 2.19/f *180/f2 30 
30-300 27.5 0.073  0.2 30 
300-1,500  ----- ----- f/1500  30 
1,500-100,000  ----- ----- 1.0 30 
 
Note 1: asterisk (*) is  plane -wave equivalent power density.  
Note 2: f is the testing frequency in MHz.   
-  - 53Appendix   Measurement of low power radio frequency devices  
 
Appendix I   Measurement of international radiators  
 
I. Note:  
The following procedure may be used as a guide for deter mining compliance of international radiators 
operation on frequencies above 30 MHz that can be tested on an open site with certain regulatory 
requirements.  
 
II. Test items:  
(I) AC power line conducted emission measurements setup:  applies only to EUTs that oper ate from public 
utility powerlines.  
1.  The AC power line conducted emission test site shall conform to the  requirement s of CNS13306 -1; The 
measuring instruments, containing the LISN, shall conform to the  requirement s of CNS13306 -1. 
2.  The EUT shall be configured  in accordance with CNS13438.  If the EUT uses a detachable antenna, 
these measurements shall be made with a suitable dummy load connected to the antenna output 
terminals;  otherwise, the tests shall be made with the antenna connected and, if adjustable, ful ly 
extended.  
3.  Use the type and length of interface cables specified in 5.6 and connect them to the interface ports  on 
the EUT . In accordance with 5.6.1, the bundle shall be secured with masking tape or any other 
nonconducting material  that will not affect t he measurements.  
4.  Connect the EUT power cord to one LISN and connect the peripheral or support equipment power cords 
to a separate LISN. AC power for all LISNs is to be obtained from the same one power source. If the 
EUT power cord is long enough to be bund led, the bundle should be secured with masking tape or any 
other nonconducting material that will not affect the measurements. Power cords of non -EUT equipment 
do not require bundling. Drape AC power cords of non -EUT equipment over the rear edge of the tab le, 
and route them down onto the floor of the AC powerline conducted emission test site to the second 
LISN. Power cords of floor -standing accessory equipment may be routed in any convenient fashion atop 
the reference groundplane or insulating material spec ified in 5.6.2. Power cords of peripheral equipment 
should not be draped over the top of an LISN.  
5.  The EUT shall be supplied with the appropriate modulation. If the EUT transmit only pulse modulation  
and has coding switches, these shall be set to the positi on that produces the maximum duty cycle 
during measurements.  
 
(II) AC power line conducted emission measurements:  
1.  Check the calibration of measuring instrument using either an internal calibrator or a known signal level 
from an external signal generator.  
2.  A spectrum analyzer or other instrument providing spectral display is recommended for exploratory AC 
powerline conducted emission measurements. Connect the measuring instrument to the RF port of a 
section of the LISN supplying current to the EUT using a sui table length of coaxial cable. Terminate all 
other RF ports of the LISN in 50 -ohm resistive. Set the 6dB bandwidth of the measuring instrument to 
not less than 10 kHz and the detector function to the peak mode. Set the controls on the measuring 
instrument to enable viewing the entire frequency range for which limits are specified.  
3.  Activate the EUT and the measuring instrument.  The EUT should be set to transmit on any one 
convenient frequency in its rated range.  
4.  Exercise the EUT in all modes of operation as specified in 5.4. Accessory equipment connected to the 
EUT shall be exercised individually.  
5.  Use the procedure in 5.8 to determine the arrangement of the EUT system that produces the emission 
with the highest amplitude relative to the limit. The EUT may be turned off and on to determine which 
emissions emanate from it.   
-  - 546.  Repeat step 5 with the measuring instrument connected to the RF port of the other LISN section 
supplying the EUT with AC power.  
Note: Measurement are to be made only on emanations at the RF p orts of the LISNs connected to the 
EUT.  
7.  Select the EUT arrangement and mode of operation that produced the highest emission relative to the 
limit for final AC powerline conducted emission measurements. If the EUT is moved to a final AC 
powerline conducted emission test site from an exploratory conducted emission test site, be sure to 
re-maximize the highest emission according to 5.8. Set the bandwidth and the detector function of the 
instrument to measure the final AC powerline conducted emission from the E UT. 
8.  Repeat step 7 with the measuring equipment connected to the RF port of the other LISN section 
supplying the EUT with AC power.  
9.  Record the EUT arrangement, mode of operation, and interconnect cable or wire positions used for fin al 
AC powerline conducted  emission measurements.  This can be done with either diagrams or 
photographs.  
 
(III) Radiated emission measurements setup:  
1.  The measuring instruments shall conform to the requirements in CNS13306 -1. 
2.  The EUT shall be positioned on a turntable as specified in  5.6 and configured as “AC power line 
conducted emission measurements setup”.  
3.  If operated from AC power, connect the power cord of the EUT and any accessory equipment to the AC 
power source receptacle located on the turntable.  If the battery operated, begi n the tests with a new or a 
fully charged battery installed in the EUT. The AC power cords of the EUT and accessories do not 
require bundling.  Drape all AC power cords of equipment tested on a tabletop over the rear edge of the 
table and route them down on to the turntable surface to the AC receptacle.  AC power cords of 
floor-standing equipment may be routed in any convenient fashion.  
4.  If the EUT is provided only with an adjustable permanently attached antenna, it shall be tested with  this 
antenna extended to  its maximum length.  If the EUT is provided with terminals for connection of an 
external antenna, connect the antenna normally used with the EUT to these terminals, and position it  in 
a typical location or orientation.  
5.  The EUT shall be supplied with modula tion as specified in Section 5.16. If the EUT transmits only 
pulsed modulation and has coding switches, these shall be set to the position that produces the 
maximum duty cycle during measurements.  
 
(IV) Radiated emission measurement:  
1.  Check the calibration of measuring instrument using either an internal calibrator or a known signal level 
from an external signal generator.  
2.  A spectrum analyzer or other instrument providing a spectral display is recommended for exploratory 
radiated measurements. The frequency range may be scanned in segments or in its entirely depending 
on the rated frequency range of the measurement antenna [see NOTE under step 5], and the resolution 
and noise floor of the  measuring instrument. Set the 3 dB bandwidth of the measuring instrumen t to 100  
kHz or greater and the detector function to the peak mode. Set the display on the measuring instrume nt 
to enable viewing of emissions. Adjust the sweep spe ed control so the analyzer display is calibrated.  
Video filter is not used for measurement.  
Note: I. If ambient radio or TV signals are of such magnitude or spacing that emission from the EUT 
may be hidden, the scan width control may be set to 10 MHz per division or less to identify 
EUT emission. Use of a bandwidth less than 100  kHz might  be helpf ul. 
II. The bandwidth of the measuring instrument shall be wider than the pulse repetition frequency 
of the transmitted signal to measure its maximum peak level.  
3.  Activate the EUT and the measuring instrument. If the EUT operates over a range of frequencies , set it 
to one of the number of frequencies specified in 5.12.   
-  - 55Note: These exploratory tests shall be run with the EUT powered in turn from both AC and DC (battery) 
power, if the device has these capabilities, to determine which power source produces the  highest 
emission relative to the limit.  
4.  Exercise the EUT as specified in 5.4. Accessories connected to the EUT shall be exercised 
independently.  
5.  Use the procedure stipulated in 5.8 to maximize emission from the EUT and note the EUT latitude, 
arrangement, operating mode, and interconnect cable or wire positions that produce the highest 
emission relative to the limit. In addition, exploratory radiated emission testing of hand -held or 
body -worn devices shall include rotation of the EUT through three orthogona l axes to determine the 
latitude that produces the highest emission relative to the limit.  
Note: Exploratory scanning of radiated emission.  A broadband antenna is recommended for 
exploratory scanning of radiated emission. It shall be necessary to change to other measurement 
antennas during this process to cover the complete frequency range of the test.  
6.  Tune the spectrum analyzer to the next s egment of the frequency spectrum to be scanned, and repeat 
step 3 through 5 until the frequency range of interest has been investigated. When radiation 
measurements are required on an EUT on more than one operating frequency, repeat setp 3 through 5 
for ea ch additional frequency.  
7.  Select the EUT arrangement, operating mode, and interconnecting cable or wire positions from step 5 
that produced the highest emission relative to the limit to use for final radiated measurements. Set  the 
bandwidth and the detector  function as specified in appropriated section.  
8.  It is recommended that highest emission relative to the limit be remaximized per Section 5.8 before 
performing final measurements, even if the EUT is not moved from a exploratory to a final radiated 
emission test site, as slight variations in cable or wire positions can cause large variations in signal 
amplitude. Only slight variation in cable movements should be needed to remaximize the highest 
emission again.  
Note:  The same measurement antenna and distance s hould be used for remaximizing the highest 
emission relative to the limit at the final radiated emission test site.  
9.  Place the measurement antenna the distance from the EUT specified in the appropriate regulations.  
10.  Follow the procedure to measure final radi ated emission from the EUT on the number of frequencies 
specified.  When average detector function limits are specified for a pulse -modulated transmitter, the 
average level of emissio n shall be determined  by measuring the peak level of the emissions and 
correcting them with the duty cycle  detailed as follows:  
Note:  It may be necessary to use multiple measurement antennas during this process to cover the 
complete frequency range of the test.  
10.1  Turn on the transmitter, and set it to transmit the pulse train cont inuously.  
10.2  Tune a spectrum analyzer to the transmitter, carrier frequency, and set the spectrum analyzer 
resolution bandwidth wide enough to encompass all significant spectral components. The video 
bandwidth should be at least as wide as the resolution band width.  
10.3  Set the spectrum analyzer vertical scale (amplitude) to the linear mode and the analyzer frequency 
scan to 0 Hz. If necessary, move the receiving antenna closer to the device to obtain a signal level . 
10.4  Connect a storage oscilloscope to the video outp ut of the spectrum analyzer that is used to 
demodulate and detect the pulse train.  
10.5  Adjust the oscilloscope settings (or use a spectrum analyzer set to zero span)  to observe the pulse 
train, and determine the number and width of the pulses, as well as the pe riod of the train.  
10.6  Measure the pulsewidth by determining the time difference between the two half -voltage points on 
the pulse.  
10.7  When the pulse train is less than 100 ms (including blanking intervals), calculate the duty cycle by  
averaging the sum of the pul swidths over one complete pulse train. Alternatively, when the pulse 
train is not periodic or the period exceeds 100 ms, calculate the duty cycle by averaging the sum of  
the pulsewidths over the 100 ms width with highest average value, which the work perio d is the 
total pulse width is divided by 100 ms.   
-  - 5610.8  Multiply the peak -detector field strength (expressed in uV/m) of an emission from a transmitter 
using pulsed modulation by the duty cycle just measured to determine the average detector field 
strength of th at emission for comparison to the average detector limit.  
10.9  If regulations do not require radiated measurements above 1 GHz, proceed to step 13. If radiated 
measurements above 1 GHz are required, an instrument capable of measuring both peak and 
average detec tor function signals shall be used. Set the bandwidth of this instrument to 1 MHz and 
the detector function to the peak mode.  
11.  Should  all of the emission levels above 1 GHz as measured with the peak detector function comply with 
the average limit specified by the appropriate regulations, proceed to step 13. Should  any of thess 
emission levels exceed the average lkimit but comply with the peak limit, proceed to step 12.  
12.  Set the detector function of the measuring instrument to the average mode an d according to  step 11 
remeasure only those emissions form step 11 that complied with the peak limits but exceed the averag e 
limits.  
13.  Record the EUT arrangement, operating mode, and cable or wire positions used for final radiated 
emission measurements.  This can be done w ith either diagrams or photographs.  
14.  Where radiated measurements are required on an EUT on more than one operating frequency, the 
report shall list the field strength measured at the fundamental frequency, the field strength of th e three 
highest harmonic or  spurious emissions relative to the limit, and the field strength of the three highest 
restricted band emissions relative to the limit and the frequencies on which these were observed, fo r 
each operating frequency measured.  
Note:  For the purposes of this s tandard, spurious emissions shall include out -of-band emissions 
typically associated with or generated by the modulating signal.  
 
(V) Operating frequency measurement  
1.  Operating frequency measurements may be made at ambient room temperature if it is within t he range 
of +15  °C~+25 °C; otherwise, an environmental temperature test chamber set for a temperature of +20 
°C shall be used. If possible, an antenna should be connected to the EUT, as the  use of dummy load 
could affect the output frequency of the EUT. If  the EUT is equipped with or uses an adjustable length 
antenna, it should be fully extended.  
2.  Supply the EUT with nominal AC voltage, or install a new or fully charged battery in the EUT. Turn t he 
EUT on, and couple its output to the frequency counter or pr ecision frequency measurement instrument 
which is capable of measuring the required frequency tolerance of the EUT.  
Note: For purposes of measurement, place the measurement antenna at a distance (15 cm, for 
example) close to the EUT by connecting to the me asurement instrument with a suitable length of 
coaxial cable.  
3.  Tune it to one of the number of  frequencies required in Section 5.12. Adjust the location of the 
measurement antenna and the controls on the measuring instrument to obtain a suitable signal level , a 
level will not overload the measuring instrument, but is strong enough to allow the meas urement or the 
fundamental frequency of the EUT. Turn the EUT on and record the operating f requency at startup and 
two, five, and ten minutes after the EUT is energized. Four measurements in total are made.Turn the 
EUT off, and place it inside an environmen tal chamber if appropriate. Allow about 30 minutes for the 
chamber to stabilize at +20  °C before proceeding.  
4.  If there is more than one frequency for measurement, turn the EUT off to allow enough time to stabli ze 
to environmental temperature. Set the EUT to  a new operating frequency, and repeat step 3 until the 
number of frequencies specified in 5.12 are measured.  
 
(VI) Frequency stability with respect to temperature  
1.  Place the EUT in an environmental temperature test chamber, and supply the EUT with nominal AC 
voltage, or install a new fully charged battery in the EUT.  If possible, an antenna should be connected to 
the EUT,  because use of dummy load could affect the output frequency of the EUT.  If the EUT is 
equipped with or uses an adjustable length antenna,  it should be fully extended.   
-  - 572.  Supply the EUT with nominal AC voltage, or install a new or fully charged battery in the EUT.  Turn the 
EUT on, and couple its output to the frequency counter or precision frequency measurement instrument  
which is capable of m easuring the required frequency tolerance of the EUT.  
Note: For purposes of measurement, place the measurement antenna at a distance (15 cm, for 
example) close to the EUT by connecting to the measurement instrument with a suitable length of 
coaxial cable.  
3.  Tune it to one of the number of frequencies required in Section 5.12. Adjust the location of the 
measurement antenna and the controls on the measuring instrument to obtain a suitable signal level , a 
level that will not overload the measuring instrument, bu t is strong enough to allow the measurement or 
the fundamental frequency of the EUT. Turn the EUT off, and place it inside an environmental 
temperature chamber at the highest specified temperature . For devices that are normally operated 
continuously, the EU T may be energized while inside the test chamber . For devices that have oscillator 
heaters,  energize only the heater circuit while the EUT is inside the chamber . 
4.  While maintaining a constant temperature inside the environmental chamber, turn the EUT on and  
record the operating frequency at startup and two, five, and ten minutes after the EUT is energized.  
Four measurements in total are made.  
5.  If there is just one frequency for measurement, skip to step 6; otherwise, turn the EUT off to allow  
enough time to s tablize to environmental temperature. Set the EUT to a new operating frequency, and 
repeat step 4 until the number of frequencies specified in 5.12 are measured.  
6.  Repeat step 4 and 5 for the EUT with the test chamber set at the lowest temperature. Before pr oceeding 
measurement, make sure the test chamber is stablized.  
 
(VII) Frequency stability with respect to input voltage  
1.  Operating frequency measurements may be made at ambient room temperature if it is within the range 
of +15 °C~+25 °C; otherwise, an enviro nmental temperature test chamber set for a temperature of +20 
°C shall be used. If possible, an antenna should be connected to the EUT, as use of the dummy load 
could affect the output frequency of the EUT. If the EUT is equipped with or uses an adjustable  length 
antenna, it should be fully extended.  
2.  Supply the EUT with nominal AC voltage, or install a new or fully charged battery in the EUT.  Turn the 
EUT on, and couple its output to the frequency counter or precision frequency measurement instrument  
which is capable of measuring the required frequency tolerance of the EUT.  
Note: For purposes of measurement, place the measurement antenna at a distance (15 cm, for 
example) close to the EUT by connecting to the measurement instrument with a suitable length of 
coaxial cable.  
3.  Tune it to one of the number of frequencies required in Section 5.12. Adjust the location of the 
measurement antenna and the controls on the measuring instrument to obtain a suitable signal level. A 
level will not overload the measuring inst rument, but is strong enough to allow the measurement or the 
fundamental frequency of the EUT. Turn the EUT off, and place it in an environmental chamber. Allow 
about 30 minutes for the chamber to stabilize at +20 °C before proceeding , a level that will not  overload 
the measuring instrument, but is strong enough to allow measurement of the fundamental frequency of 
the EUT. Turn the EUT on and record the operating frequency at startup and two, five, and ten minute s 
after the EUT is energized. Four measurement s in total are made.   
-  - 584.  If there is just one frequency for measurement, skip to step 5; otherwise, turn the EUT off to allow  
enough time to stablize to environmental temperature. Set the EUT to a new operating frequency, and 
repeat step 3 until the number of  frequencies specified in 5.12 are measured.  
5.  If the EUT is powered from the AC power line, supply it with 85% of the nominal AC voltage and repeat 
step 3 and step 4. If the EUT is battery -operated supply it with the lowest working voltage.  
6.  If the EUT is po wered from the AC power line, supply it with 115% of the nominal AC voltage and repeat 
step 3 and step 4.  
 
(VIII) Occupied bandwidth measurements  
1.  Check the calibration of measuring instrument using either an internal calibrator or a known signal level 
from an external signal generator.  
2.  A spectrum analyzer or other instrument providing spectral display is recommended for.  Video filter is 
not used for measurement.  
Note: In order to measure the modulated signal properly, a resolution bandwidth that is small co mpared 
with the bandwidth required. Under some circumstance, the improper measurement will be made 
due to too small bandwidth. Thus, the resolution bandwidth of the measuring instrument shall be 
set to a value greater than 5  % of the bandwidth requirements . When no bandwidth requirements 
are specified, the resolution bandwidth of the measuring instrument is given in the following table:  
 
Fundamental frequency 
(MHz)  Minimum resolution 
bandwidth ( kHz) 
0.009 to 30  1 
30 to 1000  10 
1000 to 4000  100 
 
3.  Supply t he EUT with nominal AC voltage, or install a new or fully charged battery in the EUT. Turn the 
EUT on, and set it to any convenient frequency within its operating range. Set a reference level on the 
measuring instrument at –26 dB below the unmodulated carr ier. Take modulated frequency into 
consideration, adjust resolution bandwidth, sweep speed, and sweep range and display calibrated.  
4.  Apply modulation signal(s) as specified in 5.16 and measure the frequencies of the modulated signal 
from the EUT where it is  the specified number of dB below the reference level set in step 3. This is the 
occupied bandwidth. The measured result may be undertaken  with plotted graphs or photographs of the 
measuring instrument display.  
 
(IX)  Input power measurements  
1.  If possible, an antenna should be connected to the EUT, as use of  a dummy load could affect the output 
frequency of the EUT.  If the EUT is equipped with or uses an adjustable length antenna, it should be 
fully extended.  
2.  Supply the EUT with nominal AC voltage, or instal l a new or fully charged battery in the EUT.  Typical 
modulation shall be applied to the EUT during these tests.  
3.  Turn the EUT on and tune it to any one convenient frequency specified in Section 5.12. For 
measurement of the input power  to the final RF stage,  while varying the input modulation sources, 
measure the voltage at the supply to the final RF stage of the EUT, and the current in to that stage , 
using a DC voltmeter and ammeter of appropriate ranges respectively. The input power to the final RF 
stage is  the product of these values. For input power measurements on an intentional radiator, use a 
voltmeter and ammeter and measure, as appropriate, either the AC or DC voltage and current at the AC 
power cord or battery input terminals of the intentional radia tor. Again, the input power is the product of 
these values. Turn the EUT on and tune it to any one convenient frequency specified in Section 5.12. 
For measurement of the input power  to the final RF stage, while varying the input modulation sources,  
-  - 59measure the voltage at the supply to the final RF stage of the EUT, and the current in to that stage, 
using a DC voltmeter and ammeter of appropriate ranges respectively. The input power to the final RF 
stage is the product of these values. For input power measure ments on an intentional radiator, use a 
voltmeter and ammeter and measure, as appropriate, either the AC or DC voltage and current at the AC 
power cord or battery input terminals of the intentional radiator. Again, the input power is the pro duct of 
these v alues.  
 
(X) Effective radiated power measurements  
1.  Test arrangement is as field strength radiation measurement  
2.  Set the resolution bandwidth of measuring instrument per 5.15.2. The video bandwidth is not less tha n 
resolution bandwidth. In order to enable vie wing of emissions, set the sweep speed, and sweep range 
on the measuring instrument enough to cover all tested frequencies.  
3.  The receiving horizontal polarization antenna shall be raised or lowered through 1 mete r~ 4 meter 
height range until a maximum readi ng is obtained on the measuring instrument, the EUT shall be 
rotated through 360° around a horizontal axis until a higher maximum signal is received. This level shall 
be recorded as reference level.  
4.  Repeat step 3 until all frequencies that need to be measu red are complete.  
5.  Repeat step 4 with search antenna in vertical polarized orientations.  
6.  Replace the EUT with a transmitting antenna (tuned dipole antenna for frequency no more than 1  GHz 
and horn antenna for frequency above 1 GHz) in horizontally polarized  orientation and as the same 
polarized orientation with search antenna. Connect the tuned dipole antenna to a standard signal 
generator (SG). Tune SG to the frequency obtained from above steps as well as set SG at an 
appropriate output level. Rise and lowe r the search antenna to get the highest value on the 
measurement instrument, and then hold this position. Adjust the SG output to get an identical value 
derived from step 3 on measurement instrument. Record this value for result calculated.  
7.  Repeat step 6 u ntil all frequencies that need to be measured are complete.  
8.  Repeat step 7 with both transmitting antenna and search antenna in vertical polarized orientations.  
9.  If the antenna gain of EUT relative to dipole antenna (or isotropic antenna) is known, then the ERP (or 
EIRP) can be derived from the product of conducted output power at antenna terminal and the antenna 
gain.   
-  - 60Appendix II   Measurement Guidelines for Direct Sequence Spread Spectrum  
 
I. Bandwidth:  
Make the measurement with the spectrum analyzer’s resolut ion bandwidth (RBW) =100 kHz and video 
bandwidth >= RBW. In order to make an accurate measurement, set the span > RBW.  
 
II. The peak output power:  
This is a RF conducted test. Use a direct connection between the antenna port of the transmitter and  
measurement instrument, through suitable attenuation. Set the RBW > 6  dB bandwidth of the emission 
or use a peak power meter.  
 
III. Spurious emissions:  
1.  RF antenna conducted test:  
1.1 Set RBW=100  kHz, Video bandwidth (VBW) > RBW, scan up through 10th harmonic.  
1.2 All harmo nics/spurious must be at least 20 dB down from the highest emission level within the 
authorized band as measured with a 100 kHz RBW.  
2.  Radiated emission test:  
2.1 Applies to harmonics/spurs that fall in the restricted bands listed in Section 2.7. The maximum  
permitted average field strength is listed in Section 2.8.  
2.2 A pre -amp (and possibly a high -pass filter) is necessary for this measurement. For measurements 
above 1  GHz, set RBW=1  MHz, VBW=10  Hz, Sweep=auto.  
2.3 If the emission is pulsed, modify the uni t for continuous operation. Use the settings shown above, 
and then correct the readings by a corrector factor.  
 
IV. Power spectral density  
1. Use a direct connection between the antenna port of the transmitter and measurement instrument, 
through suitable attenuat ion. Locate and zoom in on emission peak(s) within the pass band. Set 
RBW=3  kHz, VBW>RBW, sweep = (SPAN/3 kHz). The peak level measured shall be less than or 
equal  +8 dBm.  
2. If devices with spectrum line spacing  is equal to or less than 3 kHz, the resolution  bandwidth must be 
reduced below 3  kHz until the individual lines in the spectrum are greater than 3  kHz. The 
measurement data must then be normalized to 3  kHz by summing the power of all the individual 
spectral lines within a 3  kHz band to determine compl iance.  
 
V. Alternative method:  
If antenna conducted tests cannot be performed on this device, radiated tests to show compliance wit h 
the various conducted requirements of Section 3.10.1 are acceptable. As stated previously, a pre -amp 
must be used in making th e following measurements.  
 
1.  Calculate the transmitter's peak power using the following equation:  
 
 
 
 
 dPGE30 
-  - 61E is the measured maximum fundamental field strength in V/m.  
G is the numeric gain of the transmitting antenna with reference to an isotropic radiator.  
d is the distance in meters from which the field strength was measured.  
P is the power in W.  
 
 
 
 
2.  Measure the power spectral density as follows:  
2.1 Tune the analyzer to the highest point of the maximized fundamental emission. Reset the analyzer 
to a RBW = 3 kHz, VBW > RBW, span = 300  kHz, sweep = 100 seconds.  
2.2 From the peak level obtained, derive the field strength, E. Using the aforementioned equations, 
calculate a power level for  comparison to the + 8 dBm limit.  GEdP30)(2
 
-  - 62Appendix III   Measurement Guidelines for  Frequency Hopping Spread Spectrum Systems  
 
 
I. Carrier frequency separation:  
(I) The EUT must have its hopping function enabled.  
(II) Use the following spectrum analyzer settings:  
1. Span = wide enough to capture the peaks of two adjacent channels.  
2. Resolution (or IF)  Bandwidth (RBW) >= 1  % of the span; Video (or Average) Bandwidth (VBW) >= 
RBW.  
3. Sweep = auto; Detector function = peak; Trace = max hold  
4. Use the marker -delta function to determine the separation between the peaks of the adjacent 
channels.  
 
II. Number of ho pping frequencies:  
(I) The EUT must have its hopping function enabled.  
(II) Use the following spectrum analyzer settings:  
1. Span = the frequency band of operation.  
2. Resolution (or IF) Bandwidth (RBW) >= 1  % of the span; Video (or Average) Bandwidth (VBW) >= 
RBW.  
3. Sweep  = auto; Detector function = peak; Trace = max hold  
 
III. Time of occupancy (Dwell Time):  
(I) The EUT must have its hopping function enabled.  
(II) Use the following spectrum analyzer settings:  
1. Span = zero span, centered on a hopping channel; RBW = 1 MHz; VBW >= RBW  
2. Sweep = as necessary to capture the entire dwell time per hopping channel.  
3. Detector function = peak; Trace = max hold  
4. If possible, use the marker -delta function to determine the dwell time.  If this value varies with 
different modes of operation (e.g., dat a rate, modulation format, etc.), repeat this test for each 
variation.  
 
IV. 20 dB bandwidth:  
(I) Use the following spectrum analyzer settings:  
1. Span = approximately 2 to 3 times the 20 dB bandwidth, centered on a hopping channel.  
2. RBW >= 1% of the 20 dB band width; VBW >= RBW  
3. Sweep = auto; Detector function = peak; Trace = max hold  
4. The EUT should be transmitting at its maximum data rate. Allow the trace to stabilize. Use the 
marker -to-peak function to set the marker to the peak of the emission.  
5. Use the marker -delta function to measure 20 dB down bandwidth of the emission. If this value 
varies with different modes of operation (e.g., data rate, modulation format, etc.), repeat this tes t 
for each variation.  
  
-  - 63V. The peak output power:  
(I) Use the following spectr um analyzer settings:  
1. Span = approximately 5 times the 20 dB bandwidth, centered on a hopping channel.  
2. RBW > 1  % of the 20 dB bandwidth of the emission being measured; VBW >= RBW  
3. Sweep = auto; Detector function = peak; Trace = max hold  
4. Use the marker -to-peak function to set the marker to the peak of the emission. The indicated level 
is the peak output power.  
5. Please note above regarding external attenuation and cable loss.  
 
VI. Band -edge compliance of RF conducted emissions:  
(I) Use the following spectrum an alyzer settings:  
1. Span = wide enough to capture the peak level of the emission operating on the channel closest to 
the band edge, as well as any modulation signal which fall outside of the authorized band of 
operation  
2. RBW = 1  % of the span; VBW >= RBW.  
3. Swee p = auto; Detector function = peak; Trace = max hold  
4. Set the marker on the emission at the band edge, or on the highest modulation product outside of 
the band, if this level is greater than that at the band edge.  
5. Enable the marker -delta function, then use the marker -to-peak function to move the marker to the 
peak of the in -band emission. The marker -delta value now displayed must comply with the limit 
specified in this Section.  
6. Using the same instrument settings, enable the hopping function of the EUT.  
7. Follo w the same procedure listed above to determine if any spurious emissions caused by the 
hopping function also comply with the specified limit.  
 
VII. Spurious RF conducted emissions  
(I) Use the following spectrum analyzer settings:  
1. Span = wide enough to capt ure the peak level of the in -band emission and all spurious emissions 
(e.g., harmonics) from the lowest frequency generated in the EUT up through the 10 th harmonic. 
Typically, several plots are required to cover this entire span.  
2. RBW = 100 kHz; VBW >= RBW.  
3. Sweep = auto; Detector function = peak; Trace = max hold  
4. Set the marker on the peak of any spurious emission recorded. The level displayed must comply 
with the specified limit.  
 
VIII. Spurious radiated emissions  
(I) This test is required for any spurious emission o r modulation pr oduct that falls in a Restricted Band, 
as defined in Section 2.7.   
-  - 64(II) It must be performed with the highest gain of each type of antenna proposed for use with the EUT. 
Use the following spectrum analyzer settings:  
1. Span = wide eno ugh to fully capture the emission being measured  
2. RBW = 1 MHz for f >= 1 GHz, 100 kHz for f < 1 GHz; VBW >= RBW.  
3. Sweep = auto; Detector function = peak; Trace = max hold  
4. Follow the guidelines in Appendix 1 with respect to maximizing the emission. A pre -amp and a 
high pass filter may be required for this test, in order to provide the measuring system with 
sufficient sensitivity. The peak reading of the emission, after being corrected by the antenna facto r, 
cable loss, pre -amp gain, etc., is the peak field str ength, which must comply with the limit specified 
in Section 5.15.2.  
5. Now set the VBW to 10 Hz, while maintaining all of the other instrument settings. This peak level, 
once corrected, must comply with the limit specified in Section 2.8.  
6. If the dwell time p er channel of the hopping signal is less than 100 ms, then the reading obtained 
with the 10 Hz VBW may be further adjusted by a “duty cycle correction factor” in an effort to 
demonstrate compliance with the Section 2.8 limit.  
 
IX. Alternative test procedur es: 
If antenna conducted tests cannot be performed on this device, radiated tests to show compliance wit h 
the peak output power limit specified in Section 3.10.1 .2 and the spurious RF conducted emission limit 
specified in Section 3.10.1 .5 are acceptable. A s stated previously, a pre -amp, and, probably, a high 
pass filter, are required for the following measurements.  
 
(I) Calculate the transmitter's peak power using the following equation:  
 
 
 
 
E is the measured maximum fundamental field strength in V/m.  
G is the numeric gain of the transmitting antenna with reference to an isotropic radiator.  
d is the distance in meters from which the field strength was measured.  
P is the power in W.  
 
 
 
 
 
 
(II) The spurious RF conducted emission  
Use the following spectrum an alyzer settings:  
1. Span = wide enough to fully capture the emission being measured  
2. RBW = 100 kHz; VBW >= RBW.  
3. Sweep = auto; Detector function = peak; Trace = max hold  
4. Measure the field strength of both the fundamental emission and all spurious emissions with  these 
settings. The measured field strength of all spurious emissions must be below the measured field 
strength of the fundamental emission by the amount specified in 3.10.1 .5. This is only applied on 
spurious emissions that do not fall in restricted band . 
 dPGE30
GEdP30)(2
 
-  - 65(III) Marker -delta  method:  
While undertaking  radiated band -edge measurements according to Chapter 5, the following 
techniques are for determining band -edge compliance.  
 
1.  Perform an in -band field strength measurement of the fundamental emission using th e RBW and 
detector function required by Section 5.15.2 for the frequency being measured. For transmitters 
operating above 1 GHz, use a 1 MHz RBW, a 1 MHz VBW, and a peak detector. Repeat the 
measurement with an average detector (i.e., 1 MHz RBW with 10 Hz VBW).  
Note:  For pulsed emissions , corrector  factors must be included. Also, please note that radiated 
measurements of the fundamental emission  of a transmitter operating under 3.10.1 are not 
normally required, but they are necessary in connection with this  procedure.  
2.  Choose a spectrum analyzer span that encompasses both the peaks of the fundamental emission 
and the band -edge emission under investigation. Set the analyzer RBW to 1  % of the total span 
(but never less than 30 kHz) with a video bandwidth equal  to or greater than the RBW. Record the 
peak levels of the fundamental emission and the relevant band -edge emission. Observe the 
stored trace and measure the amplitude delta between the peak of the fundamental and the peak 
of the band -edge emission. This i s only a relative measurement to determine the amount by which 
the emission drops at the band -edge relative to the highest fundamental emission level.  
3.  Subtract the delta measured in step (2) from the field strengths measured in step 1. The resultant 
field strengths are then used to determine band -edge compliance as required by Section 2.7.  
4.  The above "delta" measurement technique may be used for measuring emissions that are up to 
two "standard" bandwidths away from the band -edge,  where a "standard" bandwid th is the 
bandwidth specified by Section 5.15.2 for the frequency being measured.