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_(6) Mobile devices must comply with the same separation distances from protected services in [§ 15.712](/on/2024-04-11/title-47/section-15.712) as fixed devices.
(7) Mobile devices may use electrically steerable directional antennas, but a device's maximum EIRP in any direction must be used by the white space database in determining channel availability.
(8) A mobile device must re-check its coordinates at least once every 60 seconds while in operation except while in sleep mode, _i.e.,_ in a mode in which the device is inactive but is not powered down. It must cease operation if its location is within 1.9 kilometers of the boundary, or outside the boundary, of the geo-fenced area over which the white space database has determined the available channels.
(9) A mobile white space device shall access the database at least as frequently as specified in [paragraph (h)](/on/2024-04-11/title-47/section-15.711#p-15.711(h)) of this section to verify that the operating channel(s) and corresponding power levels continue to remain available.
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_(10) Operation of mobile white space devices on satellites and aircraft, including unmanned aerial vehicles, is prohibited.
\[[80 FR 73070](https://www.federalregister.gov/citation/80-FR-73070), Nov. 23, 2015, as amended at [81 FR 4974](https://www.federalregister.gov/citation/81-FR-4974), Jan. 29, 2016; [82 FR 41559](https://www.federalregister.gov/citation/82-FR-41559), Sept. 1, 2017; [84 FR 34797](https://www.federalregister.gov/citation/84-FR-34797), July 19, 2019; [86 FR 2292](https://www.federalregister.gov/citation/86-FR-2292), Jan. 12, 2021; [87 FR 18992](https://www.federalregister.gov/citation/87-FR-18992), Apr. 1, 2022; [88 FR 32692](https://www.federalregister.gov/citation/88-FR-32692), May 22, 2023\]
#### § 15.712 Interference protection requirements.
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_The separation distances in this section apply to fixed, mobile, and personal/portable white space devices with a location accuracy of ±50 meters. These distances must be increased by the amount that the location uncertainty of a white space device exceeds ±50 meters. Narrowband white space devices shall comply with the separation distances applicable to a fixed white space device operating with 30 dBm conducted power and 36 dBm EIRP across a 6 megahertz channel.
(a) _Digital television stations, and digital and analog Class A TV, low power TV, TV translator and TV booster stations_ —
(1) _Protected contour._ White space devices must protect digital and analog TV services within the contours shown in the following table. These contours are calculated using the methodology in [§ 73.684 of this chapter](/on/2024-04-11/title-47/section-73.684) and the R-6602 curves contained in [§ 73.699 of this chapter](/on/2024-04-11/title-47/section-73.699).
Type of station
Protected contour
Channel
Contour
(dBu)
Propagation curve
Analog: Class A TV, LPTV, translator and booster
Low VHF (2-6)
47
F(50,50)
High VHF (7-13)
56
F(50,50)
UHF (14-69)
64
F(50,50)
Digital: Full service TV, Class A TV, LPTV, translator and booster
Low VHF (2-6)
28
F(50,90)
High VHF (7-13)
36
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_F(50,90)
UHF (14-51)
41
F(50,90)
(2) _Required separation distance._ White space devices must be located outside the contours indicated in [paragraph (a)(1)](/on/2024-04-11/title-47/section-15.712#p-15.712(a)(1)) of this section of co-channel and adjacent channel stations by at least the minimum distances specified in the tables in [paragraph (a)(2)(v)](/on/2024-04-11/title-47/section-15.712#p-15.712(a)(2)(v)) of this section.
(i) If a device operates between two defined power levels, it must comply with the separation distances for the higher power level.
(ii) White space devices operating at 40 mW EIRP or less are not required to meet the adjacent channel separation distances.
(iii) Fixed white space devices operating at 100 mW EIRP or less per 6 megahertz across multiple contiguous TV channels with at least 3-megahertz separation between the frequency band occupied by the white space device and adjacent TV channels are not required to meet the adjacent channel separation distances.
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_(iv) Fixed white space devices may only operate above 4 W EIRP in less congested areas as defined in [§ 15.703](/on/2024-04-11/title-47/section-15.703).
(v) The following are the tables of minimum required separation distances outside the contours of co-channel and adjacent channel stations that white space devices must meet.
Table 2 to Paragraph (a)(2)(v)
Mode II personal/portable white space devices
Required separation in kilometers from co-channel digital or analog TV
(full service or low power) protected contour
16 dBm
(40 mW)
20 dBm
(100 mW)
Communicating with Mode II or Fixed device
1.3
1.7
Communicating with Mode I device
2.6
3.4
Table 3 to Paragraph (a)(2)(v)
Fixed white space devices
Antenna height above
average terrain of
unlicensed devices
(meters)
Required separation in kilometers from co-channel digital or analog TV
(full service or low power) protected contour1
16 dBm
(40 mW)
20 dBm
(100 mW)
24 dBm
(250 mW)
28 dBm
(625 mW)
32 dBm
(1,600 mW)
36 dBm
(4 W)
40 dBm _
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_(10 W)
42 dBm
(16 W)
Less than 3
1.3
1.7
2.1
2.7
3.3
4.0
4.5
5.0
3-10
2.4
3.1
3.8
4.8
6.1
7.3
8.5
9.4
10-30
4.2
5.1
6.0
7.1
8.9
11.1
13.9
15.3
30-50
5.4
6.5
7.7
9.2
11.5
14.3
19.1
20.9
50-75
6.6
7.9
9.4
11.1
13.9
18.0
23.8
26.2
75-100
7.7
9.2
10.9
12.8
17.2
21.1
27.2
30.1
100-150
9.4
11.1
13.2
16.5
21.4
25.3
32.3
35.5
150-200
10.9
12.7
15.8
19.5
24.7
28.5
36.4
39.5
200-250
12.1
14.3
18.2
22.0
27.3
31.2
39.5
42.5
250-300
13.9
16.4
20.0
23.9
29.4
35.4
42.1
45.9
300-350
15.3
17.9
21.7
25.7
31.4
37.6
44.5
48.4
350-400
16.6
19.3
23.2
27.3
33.3
39.7
46.9
51.0
400-450
17.6
20.4
24.4
28.7
35.1
41.9
49.4
53.8
450-500
18.3
21.4
25.5
30.1
36.7
43.7
51.4
55.9
500-550
18.9
21.8
26.3
31.0
37.9
45.3
53.3
57.5
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_1 When communicating with Mode I personal/portable white space devices, the required separation distances must be increased beyond the specified distances by 1.3 kilometers if the Mode I device operates at power levels no more than 40 mW EIRP or 1.7 kilometers if the Mode I device operates at power levels above 40 mW EIRP.
Table 4 to Paragraph (a)(2)(v)
Personal/portable white space devices
Required separation in kilometers from adjacent channel digital
or analog TV (full service or low power) protected contour
20 dBm
(100 mW)
Communicating with Mode II or Fixed device
0.1
Communicating with Mode I device
0.2
Table 5 to Paragraph (a)(2)(v)
Fixed white space devices
Antenna height above average
terrain of unlicensed devices
(meters)
Required separation in kilometers from adjacent channel digital or analog TV
(full service or low power) protected contour1
20 dBm
(100 mW)
24 dBm
(250 mW)
28 dBm
(625 mW)
32 dBm
(1,600 mW)
36 dBm
(4 W)
40 dBm
(10 W)
42 dBm
(16 W)
Less than 3
0.1
0.1
0.1
0.1
0.2
0.2
0.3
3-10
0.1
0.2
0.2
0.2
0.3
0.4
0.5
10-30
0.2
0.3
0.3
0.4
0.5
0.6
0.7
30-50
0.3
0.3
0.4
0.5
0.7
0.8
1.0
50-75
0.3
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_0.4
0.5
0.7
0.8
0.9
1.0
75-100
0.4
0.5
0.6
0.8
1.0
1.1
1.3
100-150
0.5
0.6
0.8
0.9
1.2
1.3
1.5
150-200
0.5
0.7
0.9
1.1
1.4
1.5
1.7
200-250
0.6
0.8
1.0
1.2
1.5
1.7
1.9
250-300
0.7
0.8
1.0
1.3
1.6
2.1
2.3
300-350
0.7
0.9
1.1
1.4
1.8
2.2
2.4
350-400
0.8
1.0
1.2
1.5
1.9
2.4
2.7
400-450
0.8
1.0
1.3
1.6
2.1
2.6
2.9
450-500
0.8
1.1
1.4
1.7
2.1
2.7
2.9
500-550
0.9
1.2
1.5
1.8
2.2
2.8
3.0
1 When communicating with a Mode I personal/portable white space device that operates at power levels above 40 mW EIRP, the required separation distances must be increased beyond the specified distances by 0.1 kilometers.
(3) _Fixed white space device antenna height._ Fixed white space devices must comply with the requirements of [§ 15.709(g)](/on/2024-04-11/title-47/section-15.709#p-15.709(g)).
(b) _TV translator, Low Power TV (including Class A) and Multi-channel Video Programming Distributor (MVPD) receive sites._
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_(1) MVPD, TV translator station and low power TV (including Class A) station receive sites located outside the protected contour of the TV station(s) being received may be registered in the white space database if they are no farther than 80 km outside the nearest edge of the relevant contour(s). Only channels received over the air and used by the MVPD, TV translator station or low power/Class A TV station may be registered.
(2) White space devices may not operate within an arc of ±30 degrees from a line between a registered receive site and the contour of the TV station being received in the direction of the station's transmitter at a distance of up to 80 km from the edge of the protected contour of the received TV station for co-channel operation and up to 20 km from the registered receive site for adjacent channel operation, except that the protection distance shall not exceed the distance from the receive site to the protected contour.
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_(3) Outside of the ±30 degree arc defined in [paragraph (b)(2)](/on/2024-04-11/title-47/section-15.712#p-15.712(b)(2)) of this section:
(i) White space devices operating at 4 watts EIRP or less may not operate within 8 km from the receive site for co-channel operation and 2 km from the receive site for adjacent channel operation.
(ii) White space devices operating with more than 4 watts EIRP and up to 10 watts EIRP may not operate within 10.2 kilometers from the receive site for co-channel operation and 2.5 kilometers from the receive site for adjacent channel operation.
(iii) White space devices operating with more than 10 watts EIRP may not operate within 16.6 kilometers from the receive site for co-channel operation and 3.5 kilometers from the receive site for adjacent channel operation.
(iv) For purposes of this section, a TV station being received may include a full power TV station, TV translator station or low power TV/Class A TV station.
(c) _Fixed Broadcast Auxiliary Service (BAS) links._
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_(1) For permanent BAS receive sites appearing in the Commission's Universal Licensing System or temporary BAS receive sites registered in the white space database, white space devices may not operate within an arc of ±30 degrees from a line between the BAS receive site and its associated permanent transmitter within a distance of 80 km from the receive site for co-channel operation and 20 km for adjacent channel operation.
(2) Outside of the ±30 degree arc defined in [paragraph (c)(1)](/on/2024-04-11/title-47/section-15.712#p-15.712(c)(1)) of this section:
(i) White space devices operating at 4 watts EIRP or less may not operate within 8 km from the receive site for co-channel operation and 2 km from the receive site for adjacent channel operation.
(ii) White space devices operating with more than 4 watts EIRP and up to 10 watts EIRP may not operate within 10.2 km from the receive site for co-channel operation and 2.5 km from the receive site for adjacent channel operation.
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_(iii) White space devices operating with more than 10 watts EIRP may not operate within 16.6 kilometers from the receive site for co-channel operation and 3.5 kilometers from the receive site for adjacent channel operation.
(d) _PLMRS/CMRS operations._
(1) White space devices may not operate at distances less than those specified in the table in this [paragraph (d)(1)](/on/2024-04-11/title-47/section-15.712#p-15.712(d)(1)) from the coordinates of the metropolitan areas and on the channels listed in [§ 90.303(a) of this chapter](/on/2024-04-11/title-47/section-90.303#p-90.303(a)).
Table 6 to Paragraph (d)(1)
White space device transmitter power
Required separation in kilometers from the areas specified in [§ 90.303(a)](/on/2024-04-11/title-47/section-90.303#p-90.303(a))
of this chapter
Co-channel operation
Adjacent channel operation
Up to 250 meters HAAT
Greater than 250 meters HAAT
Up to 250 meters HAAT
Greater than 250 meters HAAT
Up to 4 watts EIRP
134.0
158.0
131.0
155.4
Greater than 4 watts and up to 10 watts EIRP
136.0
169.8
131.5
166.0
Greater than 10 watts and up to 16 watts EIRP
139.2
171.1
132.2_
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_
166.2
(2) White space devices may not operate at distances less than those specified in the table in this [paragraph (d)(2)](/on/2024-04-11/title-47/section-15.712#p-15.712(d)(2)) from PLMRS/CMRS operations authorized by waiver outside of the metropolitan areas listed in [§ 90.303(a) of this chapter](/on/2024-04-11/title-47/section-90.303#p-90.303(a)).
Table 7 to Paragraph (d)(2)
White space device transmitter power
Required separation in kilometers from operations authorized by waiver outside of the areas specified in [§ 90.303(a) of this chapter](/on/2024-04-11/title-47/section-90.303#p-90.303(a))
Co-channel operation
Adjacent channel operation
Up to 250 meters HAAT
Greater than 250 meters HAAT
Up to 250 meters HAAT
Greater than 250 meters HAAT
Up to 4 watts EIRP
54.0
78.0
51.0
75.4
Greater than 4 watts and up to 10 watts EIRP
56.0
89.8
51.5
86.0
Greater than 10 watts and up to 16 watts EIRP
59.2
91.1
52.2
86.2
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_(e) _Offshore Radiotelephone Service._ White space devices may not operate on channels used by the Offshore Radio Service within the geographic areas specified in [§ 74.709(e) of this chapter](/on/2024-04-11/title-47/section-74.709#p-74.709(e)).
(f) _Low power auxiliary services, including wireless microphones._ White space devices are not permitted to operate within the following distances of the coordinates of registered low power auxiliary station sites on the registered channels during the designated times they are used by low power auxiliary stations.
(1) Fixed white space devices with 10 watts EIRP or less: 1 kilometer.
(2) Fixed white space devices with greater than 10 watts EIRP: 1.3 kilometers.
(3) Personal/portable white space devices: 400 meters.
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_(g) _Border areas near Canada and Mexico._ Fixed, mobile, and personal/portable white space devices shall comply with the required separation distances in [paragraph (a)(2)](/on/2024-04-11/title-47/section-15.712#p-15.712(a)(2)) of this section from the protected contours of TV stations in Canada and Mexico. White space devices are not required to comply with the separation distances in paragraph (a)(2) from portions of the protected contours of Canadian or Mexican TV stations that fall within the United States.
(h) _Radio astronomy services._
(1) Operation of fixed, mobile, and personal/portable white space devices is prohibited on all channels within 2.4 kilometers at the following locations.
(i) The Naval Radio Research Observatory in Sugar Grove, West Virginia at 38 30 58 N and 79 16 48 W.
(ii) The Table Mountain Radio Receiving Zone (TMRZ) at 40 08 02 N and 105 14 40 W.
(iii) The following facilities:
Observatory
Latitude
(deg/min/sec)
Longitude
(deg/min/sec)
Arecibo Observatory
18 20 37 N
066 45 11 W
Green Bank Telescope (GBT)
38 25 59 N
079 50 23 W
Very Long Baseline Array (VLBA) Stations:
Pie Town, NM
34 18 04 N
108 07 09 W
Kitt Peak, AZ
31 57 23 N
111 36 45 W
Los Alamos, NM
35 46 30 N
106 14 44 W
Ft. Davis, TX
30 38 06 N
103 56 41 W
N. Liberty, IA
41 46 17 N
091 34 27 W
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_Brewster, WA
48 07 52 N
119 41 00 W
Owens Valley, CA
37 13 54 N
118 16 37 W
St. Croix, VI
17 45 24 N
064 35 01 W
Hancock, NH
42 56 01 N
071 59 12 W
Mauna Kea, HI
19 48 05 N
155 27 20 W
(2) Operation within the band 608-614 MHz is prohibited within the areas defined by the following coordinates (all coordinates are NAD 83):
(i) Pie Town, NM
North latitude
(deg/min/sec)
West longitude
(deg/min/sec)
35 25 56.28
107 44 56.40
35 15 57.24
107 41 27.60
33 52 14.16
107 30 25.20
33 22 39.36
107 49 26.40
33 57 38.52
109 36 10.80
34 04 46.20
109 34 12.00
34 27 20.88
109 12 43.20
35 15 30.24
108 25 55.20
(ii) Kitt Peak, AZ
North latitude
(deg/min/sec)
West longitude (deg/min/sec)
34 08 18.24
111 36 46.80
33 54 10.08
109 38 20.40
32 09 25.56
113 42 03.60
31 29 15.72
111 33 43.20
33 20 36.60
113 36 14.40
34 09 20.52
112 34 37.20
(iii) Los Alamos, NM
North latitude
(deg/min/sec)
West longitude (deg/min/sec)
36 25 54.12
106 06 07.20
36 32 26.88
105 59 27.60
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_36 45 23.40
105 48 03.60
36 48 10.44
105 30 21.60
36 13 37.92
105 26 38.40
35 38 40.92
105 48 36.00
35 36 51.48
105 49 30.00
34 06 17.28
107 10 48.00
34 16 18.12
107 17 16.80
35 21 22.68
106 51 07.20
(iv) Ft. Davis, TX
North latitude
(deg/min/sec)
West longitude (deg/min/sec)
30 42 16.92
103 55 22.80
30 35 49.92
103 41 52.80
30 32 35.88
103 43 04.80
30 25 20.64
103 49 48.00
30 24 30.24
103 52 30.00
30 26 14.28
103 57 54.00
30 33 03.60
104 09 10.80
30 40 03.36
104 05 9.60
30 43 11.28
103 58 48.00
(v) N. Liberty, IA
North latitude
(deg/min/sec)
West longitude (deg/min/sec)
42 03 27.00
90 54 16.56
41 59 03.12
90 46 49.44
41 34 19.20
90 51 11.16
41 19 27.12
90 58 58.80
41 02 09.96
91 07 18.84
41 07 51.24
92 03 44.64
41 50 03.12
92 36 20.16
42 28 50.16
91 44 35.16
(vi) Brewster, WA
North latitude
(deg/min/sec)
West longitude
(deg/min/sec)
48 18 00.36
119 35 27.60
48 16 40.08
119 34 51.60
48 15 20.52
119 34 33.60
48 12 26.64
119 34 08.40
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_48 07 51.96
119 34 33.60
48 06 44.64
119 34 48.00
47 58 44.40
119 36 03.60
47 55 06.60
119 37 40.80
47 52 48.72
119 39 03.60
48 00 49.68
119 59 06.00
48 26 59.64
119 46 04.80
48 26 08.52
119 43 22.80
(vii) Owens Valley, CA
North latitude
(deg/min/sec)
West longitude
(deg/min/sec)
37 05 49.56
118 02 13.20
37 03 27.36
118 01 08.40
36 29 09.96
118 06 50.40
36 30 48.60
118 11 56.40
36 37 08.04
118 16 37.20
37 25 12.72
118 41 16.80
37 27 30.24
118 41 02.40
37 44 45.96
118 39 03.60
37 59 49.92
118 32 09.60
37 46 12.72
118 20 09.60
(viii) St. Croix, VI
North latitude
(deg/min/sec)
West longitude
(deg/min/sec)
18 29 15.36
64 22 38.28
18 06 51.12
64 08 03.84
18 04 31.44
64 06 12.24
18 02 02.76
64 04 33.96
17 59 26.52
64 03 09.36
17 56 43.80
64 01 59.52
17 53 56.04
64 01 04.80
17 51 03.96
64 00 25.56
17 48 09.72
64 00 02.16
17 42 19.08
63 58 57.36
17 39 07.92
63 58 15.96
17 42 10.44
64 39 37.44
17 43 57.00
64 50 46.32
18 07 24.24
66 02 36.96
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_18 16 13.80
65 44 56.04
(ix) Hancock, NH
North latitude
(deg/min/sec)
West longitude
(deg/min/sec)
44 08 59.64
71 32 01.68
43 46 24.60
71 18 57.60
42 58 41.88
71 15 14.04
42 29 25.08
71 52 51.96
42 34 05.88
72 07 08.76
42 34 41.52
72 09 41.76
42 55 47.28
72 55 03.72
(x) Mauna Kea, HI
North latitude
(deg/min/sec)
West longitude
(deg/min/sec)
20 11 01.32
153 03 43.20
20 00 52.92
152 35 56.40
19 46 42.60
152 35 34.80
19 32 33.36
152 36 28.80
19 18 31.68
152 38 38.40
19 04 44.04
152 42 07.20
18 51 16.56
152 46 51.60
18 38 15.72
152 52 44.40
18 25 46.56
152 59 49.20
18 13 55.20
153 07 55.20
18 02 46.68
153 17 06.00
17 52 26.40
153 27 14.40
17 42 57.96
153 38 16.80
17 35 20.04
153 50 45.60
17 27 52.20
154 03 10.80
17 21 27.00
154 16 15.60
17 16 08.40
154 29 49.20
17 11 57.84
154 43 51.60
17 08 57.48
154 58 08.40
17 07 09.12
155 12 43.20
17 23 53.52
155 27 21.60
19 29 13.92
155 36 21.60
19 47 53.88
155 29 27.60
19 48 52.92
155 27 39.60
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_19 48 58.68
155 27 14.40
(3) Operation within the band 608-614 MHz is prohibited within the following areas:
(i) The National Radio Quiet Zone as defined in [§ 1.924(a)(1) of this chapter](/on/2024-04-11/title-47/section-1.924#p-1.924(a)(1)).
(ii) The islands of Puerto Rico, Desecheo, Mona, Vieques or Culebra
(i) _600 MHz service band:_ Fixed and personal/portable devices operating in the 600 MHz Service Band must comply with the following co-channel and adjacent channel separation distances outside the defined polygonal area encompassing the base stations or other radio facilities deployed by a part 27 600 MHz Service Band licensee that has commenced operations, as defined in [§ 27.4 of this chapter](/on/2024-04-11/title-47/section-27.4).
(1) Fixed white space devices may only operate above 4 W EIRP in less congested areas as defined in [§ 15.703](/on/2024-04-11/title-47/section-15.703).
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_(2) If a device operates between two defined power levels, it must comply with the separation distances for the higher power level.
(3) For the purpose of this rule, co-channel means any frequency overlap between a channel used by a white space device and a five megahertz spectrum block used by a part 27 600 MHz band licensee, and adjacent channel means a frequency separation of zero to four megahertz between the edge of a channel used by a white space device and the edge of a five megahertz spectrum block used by a part 27 600 MHz band licensee.
(4) On frequencies used by wireless uplink services:
Mode II Personal/Portable White Space Devices
600 MHz band wireless uplink spectrum
Minimum co-channel separation distances in kilometers between white space devices and any point along the edge of a polygon representing the outer edge of base station or other radio facility deployment
16 dBm (40 mW)
20 dBm (100 mW)
Communicating with Mode II or Fixed device
5
6
Communicating with Mode I device
10
12
Fixed White Space Devices
Antenna height above average terrain of unlicensed devices (meters)
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_600 MHz band wireless uplink spectrum
Minimum co-channel separation distances in kilometers between white space devices and any point along the edge of a polygon representing the outer edge of base station or other radio facility deployment\*
16 dBm (40mW)
20 dBm
(100 mW)
24 dBm
(250mW)
28 dBm
(625 mW)
32 dBm
(1600 mW)
36 dBm
(4 W)
40 dBm
(10 W)
Less than 3
5
6
7
9
12
15
19
3—10
9
11
14
17
22
27
34
10—30
15
19
24
30
38
47
60
30—50
20
24
31
38
49
60
60
50—75
24
30
37
47
60
60
60
75—100
27
34
43
54
60
60
60
100—150
33
42
53
60
60
60
60
150—200
39
49
60
60
60
60
60
200-250
43
54
60
60
60
60
60
\*When communicating with Mode I personal/portable white space devices, the required separation distances must be increased beyond the specified distances by 5 kilometers if the Mode I device operates at power levels no more than 40 mW EIRP or 6 kilometers if the Mode I device operates at power levels above 40 mW EIRP.
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_Personal/Portable White Space Devices
600 MHz band wireless uplink
spectrum
Minimum adjacent channel separation distances in kilometers between white space devices and any point along the edge of a polygon representing the outer edge of base station or other radio facility deployment
20 dBm (100 mW)
Communicating with Mode II or Fixed device
0.1
Communicating with Mode I device
0.3
Fixed White Space Devices
Antenna height above average terrain of unlicensed devices (meters)
600 MHz band wireless uplink spectrum
Minimum adjacent channel separation distances in kilometers between white space devices and any point along the edge of a polygon representing the outer edge of base station or other radio facility deployment\*
20 dBm
(100 mW)
24 dBm
(250mW)
28 dBm
(625 mW)
32 dBm
(1600 mW)
36 dBm
(4 W)
40 dBm
(10 W)
Less than 3
0.1
0.2
0.2
0.3
0.4
0.4
3-10
0.3
0.3
0.4
0.5
0.6
0.8
10-30
0.4
0.6
0.7
0.9
1.1
1.4
30-50
0.6
0.7
0.9
1.2
1.4
1.8
50-75
0.7
0.9
1.1
1.4
1.8
2.2
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_*75-100
0.8
1.0
1.3
1.6
2.0
2.6
100-150
1.0
1.3
1.6
2.0
2.5
3.1
150-200
1.2
1.4
1.8
2.3
2.9
3.6
200-250
1.3
1.6
2.0
2.6
3.2
4.1
\*When communicating with Mode I personal/portable white space devices, the required separation distances must be increased beyond the specified distances by 0.1 kilometers.
(5) On frequencies used by wireless downlink services: 35 kilometers for co-channel operation, and 31 kilometers for adjacent channel operation.
(j) _Wireless Medical Telemetry Service._
(1) White space devices operating in the 608-614 MHz band (channel 37) are not permitted to operate within an area defined by the polygon described in [§ 15.713(j)(11)](/on/2024-04-11/title-47/section-15.713#p-15.713(j)(11)) plus the distances specified in the tables in this [paragraph (j)(1)](/on/2024-04-11/title-47/section-15.712#p-15.712(j)(1)):
(i) Mode II personal/portable white space devices.
Table 23 to Paragraph (j)(1)(i)
Required co-channel
separation distances
in kilometers from _
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_edge of polygon
16 dBm
(40 mW)
Communicating with Mode II or Fixed device
0.38
Communicating with Mode I device
0.76
(ii) Fixed white space devices, except that when communicating with Mode I personal/portable white space devices, the required separation distances must be increased beyond the specified distances by 0.38 kilometers.
Table 24 to Paragraph (j)(1)(ii)
Antenna height above average terrain of unlicensed devices
(meters)
Required co-channel
separation distances
in kilometers from
edge of polygon
16 dBm
(40 mW)
Less than 3
0.38
3-10
0.70
10-30
1.20
30-50
1.55
50-75
1.90
75-100
2.20
100-150
2.70
150-200
3.15
200-250
3.50
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_(2) White space devices operating in the 602-608 MHz band (channel 36) and 614-620 MHz band (channel 38) are not permitted to operate within an area defined by the polygon described in [§ 15.713(j)(11)](/on/2024-04-11/title-47/section-15.713#p-15.713(j)(11)) plus the distances specified in the tables in this [paragraph (j)(2)](/on/2024-04-11/title-47/section-15.712#p-15.712(j)(2)):
(i) Mode II personal/portable white space devices.
Table 25 to Paragraph (j)(2)(i)
Required adjacent channel separation
distances in meters from edge of polygon
16 dBm
(40 mW)
20 dBm
(100 mW)
Communicating with Mode II or Fixed device
8
13
Communicating with Mode I device
16
26
(ii) Fixed white space devices, except that when communicating with Mode I personal/portable white space devices, the required separation distances must be increased beyond the specified distances by 8 meters if the Mode I device operates at power levels no more than 40 mW EIRP, or 13 meters if the Mode I device operates at power levels above 40 mW EIRP.
Table 26 to Paragraph (j)(2)(ii)
Required adjacent channel separation distances
in meters from edge of polygon
16 dBm
(40 mW)
20 dBm
(100 mW)
24 dBm
(250 mW)
28 dBm
(625 mW)
32 dBm
(1600 mW)
36 dBm
(4 watts)
8
13
20
32
50
71
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_(k) _488-494 MHz band in Hawaii._ White space devices are not permitted to operate in the 488-494 MHz band in Hawaii.
\[[80 FR 73070](https://www.federalregister.gov/citation/80-FR-73070), Nov. 23, 2015, as amended at [81 FR 4974](https://www.federalregister.gov/citation/81-FR-4974), Jan. 29, 2016; [84 FR 34798](https://www.federalregister.gov/citation/84-FR-34798), July 19, 2019; [86 FR 2293](https://www.federalregister.gov/citation/86-FR-2293), Jan. 12, 2021; [86 FR 8558](https://www.federalregister.gov/citation/86-FR-8558), Feb. 8, 2021\]
#### § 15.713 White space database.
(a) _Purpose._ The white space database serves the following functions:
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_(1) To determine and provide to a white space device, upon request, the available channels at the white space device's location in the TV bands, the 600 MHz duplex gap, the 600 MHz service band, and 608-614 MHz (channel 37). Available channels are determined based on the interference protection requirements in [§ 15.712](/on/2024-04-11/title-47/section-15.712). A database must provide fixed, mobile, and Mode II personal portable white space devices with channel availability information that includes scheduled changes in channel availability over the course of the 48-hour period beginning at the time the white space devices make a recheck contact. In making lists of available channels available to a white space device, the white space database shall ensure that all communications and interactions between the white space database and the white space device include adequate security measures such that unauthorized parties cannot access or alter the white space database or the list of available channels sent to white space devices or otherwise affect the database system or white space devices in performing their intended functions or in providing adequate interference protections to authorized services operating in the TV bands, the 600 MHz duplex gap, the 600 MHz service band, and 608-614 MHz (channel 37). In addition, a white space database must also verify that the FCC identifier (FCC ID) of a device seeking access to its services is_
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_valid; under the requirement in this [paragraph (a)(1)](/on/2024-04-11/title-47/section-15.713#p-15.713(a)(1)) the white space database must also verify that the FCC ID of a Mode I device provided by a fixed or Mode II device is valid. A list of devices with valid FCC IDs and the FCC IDs of those devices is to be obtained from the Commission's Equipment Authorization System.
(2) To determine and provide to an unlicensed wireless microphone user, upon request, the available channels at the microphone user's location in the 600 MHz guard bands, the 600 MHz duplex gap, and the 600 MHz service band. Available channels are determined based on the interference protection requirements in [§ 15.236](/on/2024-04-11/title-47/section-15.236).
(3) To register the identification information and location of fixed white space devices and unlicensed wireless microphone users.
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_(4) To register protected locations and channels as specified in [paragraph (b)(2)](/on/2024-04-11/title-47/section-15.713#p-15.713(b)(2)) of this section, that are not otherwise recorded in Commission licensing databases.
(b) _Information in the white space database._
(1) Facilities already recorded in Commission databases. Identifying and location information will come from the official Commission database. These services include:
(i) Digital television stations.
(ii) Class A television stations.
(iii) Low power television stations.
(iv) Television translator and booster stations.
(v) Broadcast Auxiliary Service stations (including receive only sites), except low power auxiliary stations.
(vi) Private land mobile radio service stations.
(vii) Commercial mobile radio service stations.
(viii) Offshore radiotelephone service stations.
(ix) Class A television station receive sites.
(x) Low power television station receive sites.
(xi) Television translator station receive sites.
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_(2) Facilities that are not recorded in Commission databases. Identifying and location information will be entered into the white space database in accordance with the procedures established by the white space database administrator(s). These include:
(i) MVPD receive sites.
(ii) Sites where low power auxiliary stations, including wireless microphones and wireless assist video devices, are used and their schedule for operation.
(iii) Fixed white space device registrations.
(iv) 600 MHz service band operations in areas where the part 27 600 MHz service licensee has commenced operations, as defined in [§ 27.4 of this chapter](/on/2024-04-11/title-47/section-27.4).
(v) Locations of health care facilities that use WMTS equipment operating on channel 37 (608-614 MHz).
(c) _Restrictions on registration._
(1) Television translator, low power TV and Class A station receive sites within the protected contour of the station being received are not eligible for registration in the database.
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_(2) MVPD receive sites within the protected contour or more than 80 kilometers from the nearest edge of the protected contour of a television station being received are not eligible to register that station's channel in the database.
(d) _Determination of available channels._ The white space database will determine the available channels at a location using the interference protection requirements of [§ 15.712](/on/2024-04-11/title-47/section-15.712), the location information supplied by a white space device, and the data for protected stations/locations in the database.
(e) _White space device initialization._
(1) Fixed, mobile, and Mode II white space devices must provide their location and required identifying information to the white space database in accordance with the provisions of this subpart.
(2) Fixed, mobile, and Mode II white space devices shall not transmit unless they receive, from the white space database, a list of available channels and may only transmit on the available channels on the list provided by the database.
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_(3) Fixed and mobile white space devices register and receive a list of available channels from the database by connecting to the internet, either directly or through another fixed white space device that has a direct connection to the internet. Fixed devices must also register with the database in accordance with [paragraph (g)](/on/2024-04-11/title-47/section-15.713#p-15.713(g)) of this section.
(4) Mode II white space devices receive a list of available channels from the database by connecting to the Internet, either directly or through a fixed or Mode II white space device that has a direct connection to the Internet.
(5) A fixed or Mode II white space device that provides a list of available channels to a Mode I device shall notify the database of the FCC identifier of such Mode I device and receive verification that that FCC identifier is valid before providing the list of available channels to the Mode I device.
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_(6) A fixed device with an antenna height above average terrain (HAAT) that exceeds 250 meters generally, or 500 meters in less congested areas, shall not be provided a list of available channels. The HAAT is to be calculated using computational software employing the methodology in [§ 73.684(d) of this chapter](/on/2024-04-11/title-47/section-73.684#p-73.684(d)).
(f) _Unlicensed wireless microphone database access._ Unlicensed wireless microphone users in the 600 MHz band may register with and access the database manually via a separate Internet connection. Wireless microphone users must register with and check a white space database to determine available channels prior to beginning operation at a given location. A user must re-check the database for available channels if it moves to another location.
(g) _Fixed white space device registration._
(1) Prior to operating for the first time or after changing location, a fixed white space device must register with the white space database by providing the information listed in [paragraph (g)(3)](/on/2024-04-11/title-47/section-15.713#p-15.713(g)(3)) of this section.
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_(2) The party responsible for a fixed white space device must ensure that the white space device registration database has the most current, up-to-date information for that device.
(3) The white space device registration database shall contain the following information for fixed white space devices:
(i) FCC identifier (FCC ID) of the device;
(ii) Manufacturer's serial number of the device;
(iii) Device's geographic coordinates (latitude and longitude (NAD 83));
(iv) Device's antenna height above ground level (meters);
(v) Name of the individual or business that owns the device;
(vi) Name of a contact person responsible for the device's operation;
(vii) Address for the contact person;
(viii) Email address for the contact person;
(ix) Phone number for the contact person.
(h) _Mode II personal/portable and mobile device information to database._
(1) A mobile device and a personal/portable device operating in Mode II shall provide the database its FCC Identifier (as required by [§ 2.926 of this chapter](/on/2024-04-11/title-47/section-2.926)) and serial number as assigned by the manufacturer.
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_(2) A personal/portable device operating in Mode II shall provide the database the device's geographic coordinates (latitude and longitude (NAD 83)).
(3) A mobile device shall provide the database with the boundaries of the geo-fenced area in which it will operate. Alternatively, the boundaries of the geo-fenced area may be loaded from the database into the mobile device.
(i) _Unlicensed wireless microphone registration._ Unlicensed wireless microphone users in the 600 MHz band shall register with the database prior to operation and include the following information:
(1) Name of the individual or business that owns the unlicensed wireless microphone
(2) Address for the contact person
(3) Email address for the contact person
(4) Phone number for the contact person; and
(5) Coordinates where the device will be used (latitude and longitude in NAD 83).
(j) _White space database information._ The white space database shall contain the listed information for each of the following:
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_(1) Digital television stations, digital and analog Class A, low power, translator and booster stations, including stations in Canada and Mexico that are within the border coordination areas as specified in [§ 73.1650 of this chapter](/on/2024-04-11/title-47/section-73.1650) (a white space database is to include only TV station information from station license or license application records. In cases where a station has records for both a license application and a license, a white space database should include the information from the license application rather than the license. In cases where there are multiple license application records or license records for the same station, the database is to include the most recent records, and again with license applications taking precedence over licenses.):
(i) Transmitter coordinates (latitude and longitude in NAD 83);
(ii) radiated power (ERP);
(iii) Height above average terrain of the transmitting antenna (HAAT);
(iv) Horizontal transmit antenna pattern (if the antenna is directional);
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_(v) Amount of electrical and mechanical beam tilt (degrees depression below horizontal) and orientation of mechanical beam tilt (degrees azimuth clockwise from true north);
(vi) Channel number; and
(vii) Station call sign.
(2) Broadcast Auxiliary Service.
(i) Transmitter coordinates (latitude and longitude in NAD 83).
(ii) Receiver coordinates (latitude and longitude in NAD 83).
(iii) Channel number.
(iv) Call sign.
(3) Metropolitan areas listed in [§ 90.303(a) of this chapter](/on/2024-04-11/title-47/section-90.303#p-90.303(a)).
(i) Region name.
(ii) Channel(s) reserved for use in the region.
(iii) Geographic center of the region (latitude and longitude in NAD 83).
(iv) Call sign.
(4) PLMRS/CMRS base station operations located more than 80 km from the geographic centers of the 13 metropolitan areas defined in [§ 90.303(a) of this chapter](/on/2024-04-11/title-47/section-90.303#p-90.303(a)) (e.g., in accordance with a waiver).
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_(i) Transmitter location (latitude and longitude in NAD 83) or geographic area of operations.
(ii) TV channel of operation.
(iii) Call sign.
(5) Offshore Radiotelephone Service: For each of the four regions where the Offshore Radiotelephone Service operates.
(i) Geographic boundaries of the region (latitude and longitude in NAD 83 for each point defining the boundary of the region.
(ii) Channel(s) used by the service in that region.
(6) MVPD receive sites: Registration for receive sites is limited to channels that are received over-the-air and are used as part of the MVPD service.
(i) Name and address of MVPD company;
(ii) Location of the MVPD receive site (latitude and longitude in NAD 83, accurate to ±50 m);
(iii) Channel number of each television channel received, subject to the following condition: channels for which the MVPD receive site is located within the protected contour of that channel's transmitting station are not eligible for registration in the database;
(iv) Call sign of each television channel received and eligible for registration;
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_(v) Location (latitude and longitude) of the transmitter of each television channel received;
(7) Television translator, low power TV and Class A TV station receive sites: Registration for television translator, low power TV and Class A receive sites is limited to channels that are received over-the-air and are used as part of the station's service.
(i) Call sign of the TV translator station;
(ii) Location of the TV translator receive site (latitude and longitude in NAD 83, accurate to ±/− 50 m);
(iii) Channel number of the re-transmitted television station, subject to the following condition: a channel for which the television translator receive site is located within the protected contour of that channel's transmitting station is not eligible for registration in the database;
(iv) Call sign of the retransmitted television station; and
(v) Location (latitude and longitude) of the transmitter of the retransmitted television station.
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_(8) Licensed low power auxiliary stations, including wireless microphones and wireless assist video devices: Use of licensed low power auxiliary stations at well-defined times and locations may be registered in the database. Multiple registrations that specify more than one point in the facility may be entered for very large sites. Registrations will be valid for no more than one year, after which they may be renewed. Registrations must include the following information:
(i) Name of the individual or business responsible for the low power auxiliary device(s);
(ii) An address for the contact person;
(iii) An email address for the contact person (optional);
(iv) A phone number for the contact person;
(v) Coordinates where the device(s) are used (latitude and longitude in NAD 83, accurate to ±50 m);
(vi) Channels used by the low power auxiliary devices operated at the site;
(vii) Specific months, weeks, days of the week and times when the device(s) are used (on dates when microphones are not used the site will not be protected); and
(viii) The stations call sign.
(9) \[Reserved\]
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_(10) 600 MHz service in areas where the part 27 600 MHz band licensee has commenced operations, as defined in [§ 27.4 of this chapter](/on/2024-04-11/title-47/section-27.4):
(i) Name of 600 MHz band licensee;
(ii) Name and address of the contact person;
(iii) An email address for the contact person (optional);
(iv) A phone number for the contact person;
(v) Area within a part 27 600 MHz band licensee's Partial Economic Areas (PEA), as defined in [§ 27.6 of this chapter](/on/2024-04-11/title-47/section-27.6), where it has commenced operation. This area must be delineated by at minimum of eight and a maximum of 120 geographic coordinates (latitude and longitude in NAD 83, accurate to ±50 m);
(vi) Date of commencement of operations;
(vii) Identification of the frequencies on which the part 27 600 MHz band licensee has commenced operations;
(viii) Call sign.
(11) Location of health care facilities operating WMTS networks on channel 37 (608-614 MHz):
(i) Name and address of the health care facility;
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_(ii) Name and address of a contact person;
(iii) Phone number of a contact person;
(iv) Email address of a contact person;
(v) Latitude and longitude coordinates referenced to North American Datum 1983 (NAD 83) that define the perimeter of each facility. If several health care facilities using 608-614 MHz wireless medical telemetry equipment are located in close proximity, it is permissible to register a perimeter to protect all facilities in that cluster.
(k) _Commission requests for data._
(1) A white space database administrator must provide to the Commission, upon request, any information contained in the database.
(2) A white space database administrator must remove information from the database, upon direction, in writing, by the Commission.
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_(l) _Security._ The white space database shall employ protocols and procedures to ensure that all communications and interactions between the white space database and white space devices are accurate and secure and that unauthorized parties cannot access or alter the database or the list of available channels sent to a white space device.
(1) Communications between white space devices and white space databases, and between different white space databases, shall be secure to prevent corruption or unauthorized interception of data. A white space database shall be protected from unauthorized data input or alteration of stored data.
(2) A white space database shall verify that the FCC identification number supplied by a fixed, mobile, or personal/portable white space device is for a certified device and may not provide service to an uncertified device.
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_(3) A white space database must not provide lists of available channels to uncertified white space devices for purposes of operation (it is acceptable for a white space database to distribute lists of available channels by means other than contact with white space devices to provide list of channels for operation). To implement this provision, a white space database administrator shall obtain a list of certified white space devices from the FCC Equipment Authorization System.
\[[80 FR 73070](https://www.federalregister.gov/citation/80-FR-73070), Nov. 23, 2015, as amended at [81 FR 4974](https://www.federalregister.gov/citation/81-FR-4974), Jan. 29, 2016; [82 FR 41559](https://www.federalregister.gov/citation/82-FR-41559), Sept. 1, 2017; [84 FR 34799](https://www.federalregister.gov/citation/84-FR-34799), July 19, 2019; [86 FR 2295](https://www.federalregister.gov/citation/86-FR-2295), Jan. 12, 2021; [88 FR 32692](https://www.federalregister.gov/citation/88-FR-32692), May 22, 2023\]
#### § 15.714 White space database administration fees.
(a) A white space database administrator may charge a fee for provision of lists of available channels to fixed, mobile, and personal/portable devices and for registering fixed devices. This [paragraph (a)](/on/2024-04-11/title-47/section-15.714#p-15.714(a)) applies to devices that operate in the TV bands, the 600 MHz service band, the 600 MHz duplex gap, and 608-614 MHz (channel 37).
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_(b) A white space database administrator may charge a fee for provision of lists of available channels to wireless microphone users.
(c) The Commission, upon request, will review the fees and can require changes in those fees if they are found to be excessive.
\[[80 FR 73070](https://www.federalregister.gov/citation/80-FR-73070), Nov. 23, 2015, as amended at [84 FR 34799](https://www.federalregister.gov/citation/84-FR-34799), July 19, 2019; [86 FR 2296](https://www.federalregister.gov/citation/86-FR-2296), Jan. 12, 2021\]
#### § 15.715 White space database administrator.
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_The Commission will designate one or more entities to administer the white space database(s). The Commission may, at its discretion, permit the functions of a white space database, such as a data repository, registration, and query services, to be divided among multiple entities; however, it will designate specific entities to be a database administrator responsible for coordination of the overall functioning of a database and providing services to white space devices. Each database administrator designated by the Commission shall:
(a) Maintain a database that contains the information described in [§ 15.713](/on/2024-04-11/title-47/section-15.713).
(b) Establish a process for acquiring and storing in the database necessary and appropriate information from the Commission's databases and synchronizing the database with the current Commission databases at least once a week to include newly licensed facilities or any changes to licensed facilities.
(c) Establish a process for registering fixed white space devices and registering and including in the database facilities entitled to protection but not contained in a Commission database, including MVPD receive sites.
(d) Establish a process for registering facilities where part 74 low power auxiliary stations are used on a regular basis.
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_(e) Provide accurate lists of available channels and the corresponding maximum permitted power for each available channel to fixed, mobile, and personal/portable white space devices that submit to it the information required under [§ 15.713(e)](/on/2024-04-11/title-47/section-15.713#p-15.713(e)), [(g)](/on/2024-04-11/title-47/section-15.713#p-15.713(g)), and [(h)](/on/2024-04-11/title-47/section-15.713#p-15.713(h)) based on their geographic location and provide accurate lists of available channels and the corresponding maximum permitted power for each available channel to fixed, mobile, and Mode II devices requesting lists of available channels for Mode I devices. Database administrators may allow prospective operators of white space devices to query the database and determine whether there are vacant channels at a particular location.
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_(f) Establish protocols and procedures to ensure that all communications and interactions between the white space database and white space devices are accurate and secure and that unauthorized parties cannot access or alter the database or the list of available channels sent to a white space device consistent with the provisions of [§ 15.713(l)](/on/2024-04-11/title-47/section-15.713#p-15.713(l)).
(g) Make its services available to all unlicensed white space device users on a non-discriminatory basis.
(h) Provide service for a five-year term. This term can be renewed at the Commission's discretion.
(i) Respond in a timely manner to verify, correct and/or remove, as appropriate, data in the event that the Commission or a party brings claim of inaccuracies in the database to its attention. This requirement applies only to information that the Commission requires to be stored in the database.
(j) Transfer its database along with the IP addresses and URLs used to access the database and list of registered fixed white space devices, to another designated entity in the event it does not continue as the database administrator at the end of its term. It may charge a reasonable price for such conveyance.
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_(k) The database must have functionality such that upon request from the Commission it can indicate that no channels are available when queried by a specific white space device or model of white space devices.
(l) If more than one database is developed, the database administrators shall cooperate to develop a standardized process for providing on a daily basis or more often, as appropriate, the data collected for the facilities listed in [§ 15.713(b)(2)](/on/2024-04-11/title-47/section-15.713#p-15.713(b)(2)) to all other white space databases to ensure consistency in the records of protected facilities. In response to a request for immediate access to a channel by a licensed wireless microphone user, white space database administrators are required to share the licensed microphone channel registration information to all other white space database administrators within 10 minutes of receiving each wireless microphone registration.
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_(m) Provide a means to make publicly available all information the rules require the database to contain, including fixed white space device registrations and voluntarily submitted protected entity information, except the information provided by 600 MHz band licensees pursuant to [§ 15.713(j)(10)(v)](/on/2024-04-11/title-47/part-15/section-15.713#p-15.713(j)(10)(v)) and [(vi) of this part](/on/2024-04-11/title-47/part-15/section-15.713#p-15.713(j)(10)(vi)) shall not be made publicly available.
(n) Establish procedures to allow part 27 600 MHz service licensees to upload the registration information listed in [§ 15.713(j)(10)](/on/2024-04-11/title-47/section-15.713#p-15.713(j)(10)) for areas where they have commenced operations, as defined in [§ 27.4 of this chapter](/on/2024-04-11/title-47/section-27.4), and to allow the removal and replacement of registration information in the database when corrections or updates are necessary.
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_(o) Remove from the database the registrations of fixed white space devices that have not checked the database for at least three months to update their channel lists. A database administrator may charge a new registration fee for a fixed white space device that is removed from the database under this provision but is later re-registered.
(p) Establish procedures to allow health care facilities to register the locations of facilities where they operate WMTS networks on channel 37.
(q) Establish procedures to allow unlicensed wireless microphone users in the 600 MHz band to register with the database and to provide lists of channels available for wireless microphones at a given location.
\[[80 FR 73070](https://www.federalregister.gov/citation/80-FR-73070), Nov. 23, 2015, as amended at [81 FR 4975](https://www.federalregister.gov/citation/81-FR-4975), Jan. 29, 2016; [86 FR 2296](https://www.federalregister.gov/citation/86-FR-2296), Jan. 12, 2021; [87 FR 18993](https://www.federalregister.gov/citation/87-FR-18993), Apr. 1, 2022\]
#### § 15.717 White space devices that rely on spectrum sensing.
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_(a) _Applications for certification._ Parties may submit applications for certification of white space devices that rely solely on spectrum sensing to identify available channels. Devices authorized under this section must demonstrate with an extremely high degree of confidence that they will not cause harmful interference to incumbent radio services.
(1) In addition to the procedures in [subpart J of part 2 of this chapter](/on/2024-04-11/title-47/part-2/subpart-J), applicants shall comply with the following.
(i) The application must include a full explanation of how the device will protect incumbent authorized services against interference.
(ii) Applicants must submit a pre-production device, identical to the device expected to be marketed.
(2) The Commission will follow the procedures below for processing applications pursuant to this section.
(i) Applications will be placed on public notice for a minimum of 30 days for comments and 15 days for reply comments. Applicants may request that portions of their application remain confidential in accordance with [§ 0.459 of this chapter](/on/2024-04-11/title-47/section-0.459). This public notice will include proposed test procedures and methodologies.
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_(ii) The Commission will conduct laboratory and field tests of the pre-production device. This testing will be conducted to evaluate proof of performance of the device, including characterization of its sensing capability and its interference potential. The testing will be open to the public.
(iii) Subsequent to the completion of testing, the Commission will issue by public notice, a test report including recommendations. The public notice will specify a minimum of 30 days for comments and, if any objections are received, an additional 15 days for reply comments.
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_(b) _Power limit for devices that rely on sensing._ The white space device shall meet the requirements for personal/portable devices in this subpart except that it will be limited to a maximum EIRP of 50 mW per 6 megahertz of bandwidth on which the device operates and it does not have to comply with the requirements for geo-location and database access in [§ 15.711(b)](/on/2024-04-11/title-47/section-15.711#p-15.711(b)), [(d)](/on/2024-04-11/title-47/section-15.711#p-15.711(d)), and [(e)](/on/2024-04-11/title-47/section-15.711#p-15.711(e)). Compliance with the detection threshold for spectrum sensing in [§ 15.717(c)](/on/2024-04-11/title-47/section-15.717#p-15.717(c)), although required, is not necessarily sufficient for demonstrating reliable interference avoidance. Once a device is certified, additional devices that are identical in electrical characteristics and antenna systems may be certified under the procedures of [part 2, Subpart J of this chapter](/on/2024-04-11/title-47/part-2/subpart-J).
(c) _Sensing requirements_ —
(1) _Detection threshold._
(i) The required detection thresholds are:
(A) ATSC digital TV signals: −114 dBm, averaged over a 6 MHz bandwidth;
(B) NTSC analog TV signals: −114 dBm, averaged over a 100 kHz bandwidth;
(C) Low power auxiliary, including wireless microphone, signals: −107 dBm, averaged over a 200 kHz bandwidth.
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_(ii) The detection thresholds are referenced to an omnidirectional receive antenna with a gain of 0 dBi. If a receive antenna with a minimum directional gain of less than 0 dBi is used, the detection threshold shall be reduced by the amount in dB that the minimum directional gain of the antenna is less than 0 dBi. Minimum directional gain shall be defined as the antenna gain in the direction and at the frequency that exhibits the least gain. Alternative approaches for the sensing antenna are permitted, e.g., electronically rotatable antennas, provided the applicant for equipment authorization can demonstrate that its sensing antenna provides at least the same performance as an omnidirectional antenna with 0 dBi gain.
(2) _Channel availability check time._ A white space device may start operating on a TV channel if no TV, wireless microphone or other low power auxiliary device signals above the detection threshold are detected within a minimum time interval of 30 seconds.
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_(3) _In-service monitoring._ A white space device must perform in-service monitoring of an operating channel at least once every 60 seconds. There is no minimum channel availability check time for in-service monitoring.
(4) _Channel move time._ After a TV, wireless microphone or other low power auxiliary device signal is detected on a white space device operating channel, all transmissions by the white space device must cease within two seconds.
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_{"origins":\[{"level":"part","identifier":"15","label\_level":"Part 15","hierarchy":{"title":"47","chapter":"I","subchapter":"A","part":"15"},"current":true,"authority":\["\\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/154\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e47 U.S.C. 154\\u003c/a\\u003e, \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/302a\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e302a\\u003c/a\\u003e, \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/303\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e303\\u003c/a\\u003e, \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/304\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e304\\u003c/a\\u003e, \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/307\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e307\\u003c/a\\u003e, \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/336\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e336\\u003c/a\\u003e, \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/544a\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e544a\\u003c/a\\u003e, and \\u003ca href=\\"https://www.govinfo.gov/link/uscode/47/549\\" class=\\"usc external\\" target=\\"\_blank\\" rel=\\"noopener noreferrer\\"\\u003e549\\u003c/a\\u003e.\\n"\],"source":\["\\u003ca href=\\"https://www.federalregister.gov/citation/54-FR-17714\\" class=\\"fr-reference\\" data-reference=\\"54 FR 17714\\"\\u003e54 FR 17714\\u003c/a\\u003e, Apr. 25, 1989, unless
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otherwise noted.\\n"\],"link":"/current/title-47/part-15","title":"Part 15"}\]}
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