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                                                 **COMMITTEE 4**

  Working Group 4A                               

  FOURTH REPORT FROM WORKING GROUP 4A TO         
  COMMITTEE 4                                    

                                                 
  ---------------------------------------------- ------------------------

The following text, prepared by Working Group 4A, on agenda item 1.8.1
(Appendix 3) is presented for consideration by Committee 4.

**MOD**

APPENDIX 3 (Rev.WRC-03)

Tables of maximum permitted\
power levels for spurious or spurious domain emissions

(See Article **3**)

**MOD**

1 The following sections indicate the maximum permitted levels of
certain unwanted emissions, in terms of power as indicated in the
tables, of components supplied by a transmitter to the antenna
transmission line. Section I, which provides spurious emission limits,
is applicable until 1 January 2012 to transmitters installed on or
before 1 January 2003; Section II, which limits emissions in the
spurious domain, is applicable to transmitters installed after 1 January
2003 and to all transmitters after 1 January 2012. The provisions of
No. **4.5** apply to unwanted emissions not covered in Sections I and
II.

2 Spurious and spurious domain emissions[^1] (covered by Sections I and
II) from any part of the installation, other than the antenna and its
transmission line, shall not have an effect greater than would occur if
this antenna system were supplied with the maximum permitted power at
the frequency of that emission.

3 These levels shall not, however, apply to emergency
position-indicating radiobeacon (EPIRB) stations, emergency locator
transmitters, ships' emergency transmitters, lifeboat transmitters,
survival craft stations or maritime transmitters when used in emergency
situations.

4 For technical or operational reasons, more stringent levels than those
specified may be applied to protect specific services in certain
frequency bands. The levels applied to protect these services, such as
safety and passive services, shall be those agreed upon by the
appropriate world radiocommunication conference. More stringent levels
may also be fixed by specific agreement between the administrations
concerned. Additionally, special consideration of transmitter spurious
or spurious domain emissions may be required for the protection of
safety services, radio astronomy and space services using passive
sensors. Information on the levels of interference detrimental to radio
astronomy, Earth exploration satellites and meteorological passive
sensing is given in the most recent version of Recommendation
ITU-R SM.329.

5 Spurious and spurious domain emission limits (covered by Sections I
and II) for combined radiocommunication and information technology
equipment are those for the radiocommunication transmitters.

**[NOC]{.underline}**

Section I -- Spurious emission limits for transmitters installed on\
or before 1 January 2003 (valid until 1 January 2012)

**MOD**

Section II -- Spurious domain emission limits for transmitters installed
after 1 January 2003\
and for all transmitters after 1 January 2012

*Application of these limits*

7 The frequency range of the measurement of spurious domain emissions is
from 9 kHz to 110 GHz or the second harmonic if higher.

8 Except as provided in § 9 and 10 of this Appendix, the spurious domain
emission levels are specified in the following reference bandwidths:

-- 1 kHz between 9 kHz and 150 kHz

-- 10 kHz between 150 kHz and 30 MHz

-- 100 kHz between 30 MHz and 1 GHz

-- 1 MHz above 1 GHz.

9 The reference bandwidth of all space service spurious domain emissions
should be 4 kHz.

10 For radar systems, the reference bandwidths for specifying spurious
domain emission levels should be calculated for each particular system.
Thus, for the four general types of radar pulse modulation utilized for
radionavigation, radiolocation, acquisition, tracking and other
radiodetermination functions, the reference bandwidth values are
determined using the following:

-- for fixed-frequency, non-pulse-coded radar, one divided by the radar
pulse length, in seconds (e.g. if the radar pulse length is 1 μs, then
the reference bandwidth is 1/(1 μs) = 1 MHz);

-- for fixed-frequency, phase coded pulsed radar, one divided by the
phase chip length, in seconds (e.g. if the phase coded chip is 2 μs
long, then the reference bandwidth is 1/(2 μs) = 500 kHz);

-- for frequency modulated (FM) or chirped radar, the square root of the
quantity obtained by dividing the chirp bandwidth in MHz by the pulse
length, in µs (e.g. if the FM is from 1 250 MHz to 1 280 MHz, or 30 MHz,
during the pulse length of 10 μs, then the reference bandwidth is
(30 MHz/(10 μs)^1/2^ = 1.73 MHz);

-- for radars operating with multiple waveforms, the reference bandwidth
for specifying spurious domain emission levels is determined empirically
from observations of the radar emission and are obtained following the
guidance given in the most recent version of Recommendation ITU-R
M.1177.

In the case of radars, for which the bandwidth, as determined using the
method above, is greater than 1 MHz, a reference bandwidth of 1 MHz
should be used.

10*bis* Guidance regarding the methods of measuring spurious
[domain]{.underline} emissions is given in the most recent version of
Recommendation ITU-R SM.329. The e.i.r.p. method specified in this
Recommendation should be used when it is not possible to accurately
measure the power supplied to the antenna transmission line, or for
specific applications where the antenna is designed to provide
significant attenuation [in]{.underline} the spurious
[domain]{.underline}. Additionally, the e.i.r.p. method may need some
modification for special cases. [Specific]{.underline} guidance
regarding the methods of measuring spurious domain emissions from radar
systems is given in the most recent version of Recommendation ITU-R
M.1177.

To improve measurement accuracy, sensitivity and efficiency, the
resolution bandwidth in which spurious domain emissions are measured can
be different from the reference bandwidth for specifying spurious domain
emission levels.

**MOD**

11 The emission limits of this section apply to all emissions, including
harmonic emissions, intermodulation products, frequency conversion
products and parasitic emissions, at frequencies in the spurious domain
(see Fig. 1). The upper and lower parts of the spurious domain extend
outward from a boundary determined using Annex 1.

**ADD**

![](media/image2.wmf)

**SUP**

11*bis*

**MOD**

11*ter* For the case of a single satellite operating with more than one
transponder in the same service area, and when considering the limits
for spurious domain emissions as indicated in § 11 of this Appendix,
spurious domain emissions from one transponder may fall on a frequency
at which a second, companion transponder is transmitting. In these
situations, the level of spurious domain emissions from the first
transponder is well exceeded by the fundamental or out-of-band domain
emissions of the second transponder. Therefore, the limits of this
Appendix should not apply to those emissions of a satellite that fall
within either the necessary bandwidth or the out-of-band domain of
another transponder on the same satellite, in the same service area (see
Fig. 2).

![](media/image3.wmf)

Transponders A, B, C and D are operating on the same satellite in the
same service area. Transponder A is not required to meet spurious domain
emission limits in frequency ranges  and , but is required to meet
them in frequency ranges  and .     (WRC‑03)

# 12 Examples of applying 43 + 10 log (*P*) to calculate attenuation requirements

Where specified in relation to mean power, spurious domain emissions are
to be at least *x* dB below the total mean power *P*, i.e. --  *x* dBc.
The power *P* (W) is to be measured in a bandwidth wide enough to
include the total mean power. The spurious domain emissions are to be
measured in the reference bandwidths given in § 8 to 10. The measurement
of the spurious domain emission power is independent of the value of
necessary bandwidth. Because the absolute emission power limit, derived
from 43 + 10 log (*P*), can become too stringent for high-power
transmitters, alternative relative powers are also provided in Table II.

*Example 1*

A land mobile transmitter, with any value of necessary bandwidth, must
meet a spurious domain emission attenuation of 43 + 10 log (*P*), or
70 dBc, whichever is less stringent. The reference bandwidths for
specifying spurious domain emission levels are provided in § 8 to 10 of
this Appendix. Applying this in the frequency range between 30 MHz and
1 GHz gives a reference bandwidth of 100 kHz.

With a measured total mean power of 10 W:

-- Attenuation relative to total mean power = 43 + 10 log (10) = 53 dBc.

-- The 53 dBc value is less stringent than the 70 dBc, so the 53 dBc
value is used.

-- Therefore: Spurious domain emissions must not exceed 53 dBc in a
100 kHz bandwidth, or converting to an absolute level, they must not
exceed 10 dBW -- 53 dBc = --43 dBW in a 100 kHz reference bandwidth.

With a measured total mean power of 1 000 W:

-- Attenuation relative to total mean power = 43 + 10 log (1 000) = 73
dBc.

-- The 73 dBc value is more stringent than the 70 dBc limit, so the
70 dBc value is used.

-- Therefore: Spurious domain emissions must not exceed 70 dBc in a
100 kHz bandwidth, or converting to an absolute level, they must not
exceed 30 dBW -- 70 dBc = \_ 40 dBW in a 100 kHz reference bandwidth.

*Example 2*

A space service transmitter with any value of necessary bandwidth must
meet a spurious domain emission attenuation of 43 + 10 log (*P*), or
60 dBc, whichever is less stringent. To measure spurious domain
emissions at any frequency, Note 10 to Table II indicates using a
reference bandwidth of 4 kHz.

With a measured total mean power of 20 W:

-- Attenuation relative to total mean power = 43 + 10 log (20) = 56 dBc.

-- The 56 dBc value is less stringent than the 60 dBc limit, so the
56 dBc value is used.

-- Therefore: Spurious domain emissions must not exceed 56 dBc in a
4 kHz reference bandwidth, or converting to an absolute level, they must
not exceed 13 dBW -- 56 dBc = \_ 43 dBW in a 4 kHz reference bandwidth.

TABLE II     (WRC‑03)

Attenuation values used to calculate maximum permitted spurious domain
emission\
power levels for use with radio equipment

  --------------------------- ------------------------------------------ --
  Service category in\        Attenuation (dB) below the power\          
  accordance with Article 1,  supplied to the antenna transmission line  
  or equipment type 15                                                   

  All services except those   43 + 10 log (*P*), or 70 dBc, whichever is 
  services quoted below:      less stringent                             

  Space services (earth       43 + 10 log (*P*), or 60 dBc, whichever is 
  stations)10, 16             less stringent                             

  Space services (space       43 + 10 log (*P*), or 60 dBc, whichever is 
  stations)10, 17             less stringent                             

  Radiodetermination14        43 + 10 log (*PEP*), or 60 dB, whichever   
                              is less stringent                          

  Broadcast television11      46 + 10 log (*P*), or 60 dBc, whichever is 
                              less stringent, without exceeding the      
                              absolute mean power level of 1 mW for VHF  
                              stations or 12 mW for UHF stations.        
                              However, greater attenuation may be        
                              necessary on a case by case basis.         

  Broadcast FM                46 + 10 log (*P*), or 70 dBc, whichever is 
                              less stringent;\                           
                              the absolute mean power level of 1 mW      
                              should not be exceeded                     

  Broadcasting at MF/HF       50 dBc; the absolute mean power level of   
                              50 mW should\                              
                              not be exceeded                            

  SSB from mobile stations12  43 dB below *PEP*                          

  Amateur services operating  43 + 10 log (*PEP*), or 50 dB, whichever   
  below 30 MHz (including     is less stringent                          
  those using SSB)16                                                     

  Services operating below    43 + 10 log (*X*), or 60 dBc, whichever is 
  30 MHz, except space,       less stringent, where *X* = *PEP* for SSB  
  radiodetermination,         modulation, and *X* = *P* for other        
  broadcast, those using SSB  modulation                                 
  from mobile stations, and                                              
  amateur12                                                              

  Low-power device radio      56 + 10 log (*P*), or 40 dBc, whichever is 
  equipment13                 less stringent                             

  Emergency transmitters18    No limit                                   

  *P*: mean power in watts                                               
  supplied to the antenna                                                
  transmission line, in                                                  
  accordance with                                                        
  No. **1.158**. When burst                                              
  transmission is used, the                                              
  mean power *P* and the mean                                            
  power of any spurious                                                  
  domain emissions are                                                   
  measured using power                                                   
  averaging over the burst                                               
  duration.                                                              

  *PEP*: peak envelope power                                             
  in watts supplied to the                                               
  antenna transmission line,                                             
  in accordance with                                                     
  No. **1.157**.                                                         
  --------------------------- ------------------------------------------ --

**ADD**

ANNEX 1

Determination of the boundary between the\
out-of-band and spurious domains

1 Except as provided below, the boundary between the out-of-band and
spurious domains occurs at frequencies that are separated from the
centre frequency of the emission by the values shown in Table 1. In
general, the boundary is 250% of the necessary bandwidth, or 2.5 *B~N~*,
as shown in the Table. For most systems, the centre frequency of the
emission is the centre of the necessary bandwidth. For multichannel or
multicarrier transmitters/transponders, where several carriers may be
transmitted simultaneously from a final output amplifier or an active
antenna, the centre frequency of the emission is taken to be the centre
of the --3 dB bandwidth of the transmitter or transponder and the
transmitter or transponder bandwidth is used in place of the necessary
bandwidth for determining the boundary. For multicarrier satellite
systems, guidance on the boundary between the out-of-band and spurious
domains is provided in the latest version of Recommendation ITU-R
SM.1541. Some systems specify unwanted emissions relative to channel
bandwidth, or channel spacing. These may be used as a substitute for the
necessary bandwidth in Table 1, provided they are found in ITU--R
Recommendations.

TABLE 1

Values for frequency separation between the centre frequency\
and the boundary of the spurious domain

  -------------------- ------------- ------------ ------------ ------------ --------------
  Frequency\           Narrow-band                Normal\      Wideband     
  range                case                       separation   case         

                       for *B~N~* \< Separation                for          Separation
                                                               *B~N\ ~*\>   

  9 kHz \< *f~c~* ≤    250 Hz        625 Hz       2.5 *B~N~*   10 kHz       1.5 *B~N~* +
  150 kHz                                                                   10 kHz

  150 kHz \< *f~c~* ≤  4 kHz         10 kHz       2.5 *B~N~*   100 kHz      1.5 *B~N\ ~* +
  30 MHz                                                                    100 kHz

  30 MHz \< *f~c~* ≤ 1 25 kHz        62.5 kHz     2.5 *B~N~*   10 MHz       1.5 *B~N\ ~* +
  GHz                                                                       10 MHz

  1 GHz \< *f~c~* ≤ 3  100 kHz       250 kHz      2.5 *B~N~*   50 MHz       1.5 *B~N~* +
  GHz                                                                       50 MHz

  3 GHz \< *f~c~* ≤ 10 100 kHz       250 kHz      2.5 *B~N~*   100 MHz      1.5 *B~N~* +
  GHz                                                                       100 MHz

  10 GHz \< *f~c~* ≤   300 kHz       750 kHz      2.5 *B~N~*   250 MHz      1.5 *B~N~* +
  15 GHz                                                                    250 MHz

  15 GHz \< *f~c~* ≤   500 kHz       1.25 MHz     2.5 *B~N~*   500 MHz      1.5 *B~N~* +
  26 GHz                                                                    500 MHz

  *f~c~* \> 26 GHz     1 MHz         2.5 MHz      2.5 *B~N~*   500 MHz      1.5 *B~N~* +
                                                                            500 MHz

  NOTE -- In Table 1,                                                       
  *f~c~* is the centre                                                      
  frequency of the                                                          
  emission and *B~N~*                                                       
  is the necessary                                                          
  bandwidth. If the                                                         
  assigned frequency                                                        
  band of the                                                               
  emissions extends                                                         
  across two frequency                                                      
  ranges, then the                                                          
  values corresponding                                                      
  to the higher                                                             
  frequency range                                                           
  shall be used for                                                         
  determining the                                                           
  boundary.                                                                 
  -------------------- ------------- ------------ ------------ ------------ --------------

*Example 1*: The necessary bandwidth of an emission at 26 MHz is 1.8
kHz. Since *B~N~* is less than 4 kHz, the minimum separation of 10 kHz
applies. The spurious domain begins 10 kHz each side of the centre of
the necessary bandwidth.

*Example 2*: The necessary bandwidth of an emission at 8 GHz is 200 MHz.
Since the wideband case applies for *B~N~* \> 100 MHz at that frequency,
the spurious domain begins 1.5 × 200 MHz + 100 MHz = 400 MHz each side
of the centre of the necessary bandwidth. Using the general separation
formula, the out-of-band domain would have extended to
2.5 × 200 MHz = 500 MHz either side of the centre frequency.

2 Tables 2 and 3 show exceptions to Table 1 for narrow-band and wideband
cases, respectively, applicable to particular systems or services and
frequency bands.

TABLE 2

Narrow-band variations for systems or services and frequency bands

+----------------+------------+------------+-----------+-------------+
| System or      | Frequency  |            | Na        |             |
| service        | range      |            | rrow-band |             |
|                |            |            | case      |             |
+----------------+------------+------------+-----------+-------------+
|                |            |            | for       | Separation\ |
|                |            |            | *B~N~*    | (kHz)       |
|                |            |            | \<\       |             |
|                |            |            | (kHz)     |             |
+----------------+------------+------------+-----------+-------------+
| Fixed service  | 14 kHz -   |            | 20        | 50^(1)^     |
|                | 1.5 MHz    |            |           |             |
+----------------+------------+------------+-----------+-------------+
|                | 1.5-30 MHz | *P~T~* ≤   | 30        | 75^(2)^     |
|                |            | 50 W       |           |             |
+----------------+------------+------------+-----------+-------------+
|                |            | *P~T~* \>  | 80        | 200^(2)^    |
|                |            | 50 W       |           |             |
+----------------+------------+------------+-----------+-------------+
| ^(1)^ The      |            |            |           |             |
| separation     |            |            |           |             |
| value is based |            |            |           |             |
| on an          |            |            |           |             |
| assumption     |            |            |           |             |
| that the       |            |            |           |             |
| maximum value  |            |            |           |             |
| of the         |            |            |           |             |
| necessary      |            |            |           |             |
| bandwidth is   |            |            |           |             |
| about 3 kHz    |            |            |           |             |
| for the        |            |            |           |             |
| frequency      |            |            |           |             |
| range 14 kHz - |            |            |           |             |
| 1.5 MHz. The   |            |            |           |             |
| value of 50    |            |            |           |             |
| kHz separation |            |            |           |             |
| is extremely   |            |            |           |             |
| large as       |            |            |           |             |
| compared with  |            |            |           |             |
| the necessary  |            |            |           |             |
| bandwidth. It  |            |            |           |             |
| is because     |            |            |           |             |
| unwanted       |            |            |           |             |
| emissions of   |            |            |           |             |
| high power     |            |            |           |             |
| transmitters   |            |            |           |             |
| under          |            |            |           |             |
| modulated      |            |            |           |             |
| conditions     |            |            |           |             |
| have to be     |            |            |           |             |
| below the      |            |            |           |             |
| spurious limit |            |            |           |             |
| (70 dBc) at    |            |            |           |             |
| the boundary   |            |            |           |             |
| between the    |            |            |           |             |
| OoB and        |            |            |           |             |
| spurious       |            |            |           |             |
| domains.       |            |            |           |             |
|                |            |            |           |             |
| ^(2)^ *P~T~*   |            |            |           |             |
| is the         |            |            |           |             |
| transmitter    |            |            |           |             |
| power. The     |            |            |           |             |
| separation     |            |            |           |             |
| values are     |            |            |           |             |
| based on an    |            |            |           |             |
| assumption     |            |            |           |             |
| that the       |            |            |           |             |
| maximum value  |            |            |           |             |
| of the         |            |            |           |             |
| necessary      |            |            |           |             |
| bandwidth is   |            |            |           |             |
| about 12 kHz   |            |            |           |             |
| for the        |            |            |           |             |
| frequency      |            |            |           |             |
| range          |            |            |           |             |
| 1.5-30 MHz.    |            |            |           |             |
| The value of   |            |            |           |             |
| 200 kHz        |            |            |           |             |
| separation for |            |            |           |             |
| *P~T~* \> 50 W |            |            |           |             |
| is extremely   |            |            |           |             |
| large as       |            |            |           |             |
| compared with  |            |            |           |             |
| the necessary  |            |            |           |             |
| bandwidth. It  |            |            |           |             |
| is because     |            |            |           |             |
| unwanted       |            |            |           |             |
| emissions of   |            |            |           |             |
| high power     |            |            |           |             |
| transmitters   |            |            |           |             |
| under          |            |            |           |             |
| modulated      |            |            |           |             |
| conditions     |            |            |           |             |
| have to be     |            |            |           |             |
| below the      |            |            |           |             |
| spurious       |            |            |           |             |
| limit, 70 dBc, |            |            |           |             |
| at the         |            |            |           |             |
| boundary       |            |            |           |             |
| between the    |            |            |           |             |
| OoB and        |            |            |           |             |
| spurious       |            |            |           |             |
| domains. Also, |            |            |           |             |
| if future      |            |            |           |             |
| systems in the |            |            |           |             |
| fixed service  |            |            |           |             |
| operating in   |            |            |           |             |
| this frequency |            |            |           |             |
| range require  |            |            |           |             |
| a necessary    |            |            |           |             |
| bandwidth      |            |            |           |             |
| larger than 12 |            |            |           |             |
| kHz, it may    |            |            |           |             |
| become         |            |            |           |             |
| necessary to   |            |            |           |             |
| review the 200 |            |            |           |             |
| kHz            |            |            |           |             |
| separation.    |            |            |           |             |
+----------------+------------+------------+-----------+-------------+

TABLE 3

Wideband variations for systems or services and frequency bands

  ------------------------ --------------------------- ----------- ----------------
  System or service        Frequency range             Wideband    
                                                       case        

                                                       For *B~N~*  Separation
                                                       \>          

  Fixed service            14-150 kHz                  20 kHz      1.5 *B~N~* + 20
                                                                   kHz

  Fixed-satellite\         3.4-4.2 GHz                 250 MHz     1.5 *B~N~* + 250
  service (FSS)                                                    MHz

  FSS                      5.725-6.725 GHz             500 MHz     1.5 *B~N~* + 500
                                                                   MHz

  FSS                      7.25-7.75 GHz and           250 MHz     1.5 *B~N~* + 250
                           7.9-8.4 GHz                             MHz

  FSS                      10.7-12.75 GHz              500 MHz     1.5 *B~N~* + 500
                                                                   MHz

  Broadcasting-satellite   11.7-12.75 GHz              500 MHz     1.5 *B~N~* + 500
  service (BSS)                                                    MHz

  FSS                      12.75-13.25 GHz             500 MHz     1.5 *B~N~* + 500
                                                                   MHz

  FSS                      13.75-14.8 GHz              500 MHz     1.5 *B~N~* + 500
                                                                   MHz
  ------------------------ --------------------------- ----------- ----------------

$\Delta_{\text{sp}}\  + \ ½B_{\text{ta}}\  + \ 2B_{n}^{'}\ $ $B_{n}^{'}$

3 For primary radar stations, the boundary between the out-of-band and
spurious domains is the frequency at which the out-of-band domain limits
specified in applicable ITU-R Recommendations are equal to the spurious
domain limit defined in Table II of Appendix **3**. Further guidance on
the boundary between the out-of-band and spurious domains for primary
radar systems is provided in the most recent version of Recommendation
ITU-R SM.1541.

**ADD**

DRAFT Recommendation \[COM4/10\] (WRC-03)

Study of the boundary between the out-of-band and spurious domains\
of primary radars using magnetrons

The World Radiocommunication Conference (Geneva, 2003),

considering

*a)* that the principal objective of RR Appendix **3** is to specify the
maximum permitted level of unwanted emissions in the spurious domain;

*b)* that the out-of-band and spurious domains of an emission are
defined in RR Article **1**;

*c)* that Recommendation ITU-R SM.1541 specifies the boundary between
the out-of-band and spurious domains for primary radars, and that the
boundary is related to the emission mask based on the --40 dB bandwidth;

*d)* that RR Appendix **3** refers to Recommendation ITU-R SM.1541;

*e)* that the measurement method for unwanted emissions of radars is
described in Recommendation ITU-R M.1177,

recognizing

*a)* that § 3.3 of Annex 1 in Recommendation ITU-R SM.1539‑1 mentions
that the specification of the boundary between the out-of-band and
spurious domains of primary radars is subject to ongoing studies in
ITU-R and that there would be benefit in having these completed by the
Radiocommunication Assembly in 2006;

*b)* that there is a possibility that calculated values for the --40 dB
bandwidth related to unwanted emissions of primary radars using
magnetrons underestimate the measured bandwidth,

recommends ITU-R

1 to study calculation methods for the --40 dB bandwidth necessary for
the determination of the boundary between the spurious and out-of-band
domains of primary radars using magnetrons;

2 to establish improved measurement methods for unwanted emissions of
primary radars using magnetrons,

invites administrations

to participate actively in the above studies by submitting contributions
to ITU-R.

\_\_\_\_\_\_\_\_\_\_\_\_

[^1]: ^1^ Spurious domain emissions are unwanted emissions at
    frequencies within the spurious domain.