{"data":{"id":"us/47-cfr-15.712","jurisdiction":"us","citation":"47 CFR 15.712","heading":"Interference protection requirements.","body":"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.\n(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 and the R-6602 curves contained in § 73.699 of this chapter.\nType of station Protected contour\nChannel Contour (dBu) Propagation curve\nAnalog: Class A TV, LPTV, translator and booster Low VHF (2-6) 47 F(50,50)\nHigh VHF (7-13) 56 F(50,50)\nUHF (14-69) 64 F(50,50)\nDigital: Full service TV, Class A TV, LPTV, translator and booster Low VHF (2-6) 28 F(50,90)\nHigh VHF (7-13) 36 F(50,90)\nUHF (14-51) 41 F(50,90)\n(2) Required separation distance. White space devices must be located outside the contours indicated in paragraph (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) of this section.\n(i) If a device operates between two defined power levels, it must comply with the separation distances for the higher power level.\n(ii) White space devices operating at 40 mW EIRP or less are not required to meet the adjacent channel separation distances.\n(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.\n(iv) Fixed white space devices may only operate above 4 W EIRP in less congested areas as defined in § 15.703.\n(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.\nTable 2 to Paragraph (a)(2)(v)\nMode II personal/portable white space devices\nRequired separation in kilometers from co-channel digital or analog TV (full service or low power) protected contour\n16 dBm (40 mW) 20 dBm (100 mW)\nCommunicating with Mode II or Fixed device 1.3 1.7\nCommunicating with Mode I device 2.6 3.4\nTable 3 to Paragraph (a)(2)(v)\nFixed white space devices\nAntenna 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 contour 1\n16 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 (10 W) 42 dBm (16 W)\nLess than 3 1.3 1.7 2.1 2.7 3.3 4.0 4.5 5.0\n3-10 2.4 3.1 3.8 4.8 6.1 7.3 8.5 9.4\n10-30 4.2 5.1 6.0 7.1 8.9 11.1 13.9 15.3\n30-50 5.4 6.5 7.7 9.2 11.5 14.3 19.1 20.9\n50-75 6.6 7.9 9.4 11.1 13.9 18.0 23.8 26.2\n75-100 7.7 9.2 10.9 12.8 17.2 21.1 27.2 30.1\n100-150 9.4 11.1 13.2 16.5 21.4 25.3 32.3 35.5\n150-200 10.9 12.7 15.8 19.5 24.7 28.5 36.4 39.5\n200-250 12.1 14.3 18.2 22.0 27.3 31.2 39.5 42.5\n250-300 13.9 16.4 20.0 23.9 29.4 35.4 42.1 45.9\n300-350 15.3 17.9 21.7 25.7 31.4 37.6 44.5 48.4\n350-400 16.6 19.3 23.2 27.3 33.3 39.7 46.9 51.0\n400-450 17.6 20.4 24.4 28.7 35.1 41.9 49.4 53.8\n450-500 18.3 21.4 25.5 30.1 36.7 43.7 51.4 55.9\n500-550 18.9 21.8 26.3 31.0 37.9 45.3 53.3 57.5\n1 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.\nTable 4 to Paragraph (a)(2)(v)\nPersonal/portable white space devices\nRequired separation in kilometers from adjacent channel digital or analog TV (full service or low power) protected contour\n20 dBm (100 mW)\nCommunicating with Mode II or Fixed device 0.1\nCommunicating with Mode I device 0.2\nTable 5 to Paragraph (a)(2)(v)\nFixed white space devices\nAntenna 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 contour 1\n20 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)\nLess than 3 0.1 0.1 0.1 0.1 0.2 0.2 0.3\n3-10 0.1 0.2 0.2 0.2 0.3 0.4 0.5\n10-30 0.2 0.3 0.3 0.4 0.5 0.6 0.7\n30-50 0.3 0.3 0.4 0.5 0.7 0.8 1.0\n50-75 0.3 0.4 0.5 0.7 0.8 0.9 1.0\n75-100 0.4 0.5 0.6 0.8 1.0 1.1 1.3\n100-150 0.5 0.6 0.8 0.9 1.2 1.3 1.5\n150-200 0.5 0.7 0.9 1.1 1.4 1.5 1.7\n200-250 0.6 0.8 1.0 1.2 1.5 1.7 1.9\n250-300 0.7 0.8 1.0 1.3 1.6 2.1 2.3\n300-350 0.7 0.9 1.1 1.4 1.8 2.2 2.4\n350-400 0.8 1.0 1.2 1.5 1.9 2.4 2.7\n400-450 0.8 1.0 1.3 1.6 2.1 2.6 2.9\n450-500 0.8 1.1 1.4 1.7 2.1 2.7 2.9\n500-550 0.9 1.2 1.5 1.8 2.2 2.8 3.0\n1 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.\n(3) Fixed white space device antenna height. Fixed white space devices must comply with the requirements of § 15.709(g).\n(b) TV translator, Low Power TV (including Class A) and Multi-channel Video Programming Distributor (MVPD) receive sites. (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.\n(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.\n(3) Outside of the ±30 degree arc defined in paragraph (b)(2) of this section:\n(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.\n(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.\n(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.\n(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.\n(c) Fixed Broadcast Auxiliary Service (BAS) links. (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.\n(2) Outside of the ±30 degree arc defined in paragraph (c)(1) of this section:\n(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.\n(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.\n(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.\n(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) from the coordinates of the metropolitan areas and on the channels listed in § 90.303(a) of this chapter.\nTable 6 to Paragraph (d)(1)\nWhite space device transmitter power Required separation in kilometers from the areas specified in § 90.303(a) of this chapter\nCo-channel operation Adjacent channel operation\nUp to 250 meters HAAT Greater than 250 meters HAAT Up to 250 meters HAAT Greater than 250 meters HAAT\nUp to 4 watts EIRP 134.0 158.0 131.0 155.4\nGreater than 4 watts and up to 10 watts EIRP 136.0 169.8 131.5 166.0\nGreater than 10 watts and up to 16 watts EIRP 139.2 171.1 132.2 166.2\n(2) White space devices may not operate at distances less than those specified in the table in this paragraph (d)(2) from PLMRS/CMRS operations authorized by waiver outside of the metropolitan areas listed in § 90.303(a) of this chapter.\nTable 7 to Paragraph (d)(2)\nWhite 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\nCo-channel operation Adjacent channel operation\nUp to 250 meters HAAT Greater than 250 meters HAAT Up to 250 meters HAAT Greater than 250 meters HAAT\nUp to 4 watts EIRP 54.0 78.0 51.0 75.4\nGreater than 4 watts and up to 10 watts EIRP 56.0 89.8 51.5 86.0\nGreater than 10 watts and up to 16 watts EIRP 59.2 91.1 52.2 86.2\n(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.\n(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.\n(1) Fixed white space devices with 10 watts EIRP or less: 1 kilometer.\n(2) Fixed white space devices with greater than 10 watts EIRP: 1.3 kilometers.\n(3) Personal/portable white space devices: 400 meters.\n(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) 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.\n(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.\n(i) The Naval Radio Research Observatory in Sugar Grove, West Virginia at 38 30 58 N and 79 16 48 W.\n(ii) The Table Mountain Radio Receiving Zone (TMRZ) at 40 08 02 N and 105 14 40 W.\n(iii) The following facilities:\nObservatory Latitude (deg/min/sec) Longitude (deg/min/sec)\nArecibo Observatory 18 20 37 N 066 45 11 W\nGreen Bank Telescope (GBT) 38 25 59 N 079 50 23 W\nVery Long Baseline Array (VLBA) Stations:\nPie Town, NM 34 18 04 N 108 07 09 W\nKitt Peak, AZ 31 57 23 N 111 36 45 W\nLos Alamos, NM 35 46 30 N 106 14 44 W\nFt. Davis, TX 30 38 06 N 103 56 41 W\nN. Liberty, IA 41 46 17 N 091 34 27 W\nBrewster, WA 48 07 52 N 119 41 00 W\nOwens Valley, CA 37 13 54 N 118 16 37 W\nSt. Croix, VI 17 45 24 N 064 35 01 W\nHancock, NH 42 56 01 N 071 59 12 W\nMauna Kea, HI 19 48 05 N 155 27 20 W\n(2) Operation within the band 608-614 MHz is prohibited within the areas defined by the following coordinates (all coordinates are NAD 83):\n(i) Pie Town, NM\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n35 25 56.28 107 44 56.40\n35 15 57.24 107 41 27.60\n33 52 14.16 107 30 25.20\n33 22 39.36 107 49 26.40\n33 57 38.52 109 36 10.80\n34 04 46.20 109 34 12.00\n34 27 20.88 109 12 43.20\n35 15 30.24 108 25 55.20\n(ii) Kitt Peak, AZ\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n34 08 18.24 111 36 46.80\n33 54 10.08 109 38 20.40\n32 09 25.56 113 42 03.60\n31 29 15.72 111 33 43.20\n33 20 36.60 113 36 14.40\n34 09 20.52 112 34 37.20\n(iii) Los Alamos, NM\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n36 25 54.12 106 06 07.20\n36 32 26.88 105 59 27.60\n36 45 23.40 105 48 03.60\n36 48 10.44 105 30 21.60\n36 13 37.92 105 26 38.40\n35 38 40.92 105 48 36.00\n35 36 51.48 105 49 30.00\n34 06 17.28 107 10 48.00\n34 16 18.12 107 17 16.80\n35 21 22.68 106 51 07.20\n(iv) Ft. Davis, TX\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n30 42 16.92 103 55 22.80\n30 35 49.92 103 41 52.80\n30 32 35.88 103 43 04.80\n30 25 20.64 103 49 48.00\n30 24 30.24 103 52 30.00\n30 26 14.28 103 57 54.00\n30 33 03.60 104 09 10.80\n30 40 03.36 104 05 9.60\n30 43 11.28 103 58 48.00\n(v) N. Liberty, IA\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n42 03 27.00 90 54 16.56\n41 59 03.12 90 46 49.44\n41 34 19.20 90 51 11.16\n41 19 27.12 90 58 58.80\n41 02 09.96 91 07 18.84\n41 07 51.24 92 03 44.64\n41 50 03.12 92 36 20.16\n42 28 50.16 91 44 35.16\n(vi) Brewster, WA\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n48 18 00.36 119 35 27.60\n48 16 40.08 119 34 51.60\n48 15 20.52 119 34 33.60\n48 12 26.64 119 34 08.40\n48 07 51.96 119 34 33.60\n48 06 44.64 119 34 48.00\n47 58 44.40 119 36 03.60\n47 55 06.60 119 37 40.80\n47 52 48.72 119 39 03.60\n48 00 49.68 119 59 06.00\n48 26 59.64 119 46 04.80\n48 26 08.52 119 43 22.80\n(vii) Owens Valley, CA\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n37 05 49.56 118 02 13.20\n37 03 27.36 118 01 08.40\n36 29 09.96 118 06 50.40\n36 30 48.60 118 11 56.40\n36 37 08.04 118 16 37.20\n37 25 12.72 118 41 16.80\n37 27 30.24 118 41 02.40\n37 44 45.96 118 39 03.60\n37 59 49.92 118 32 09.60\n37 46 12.72 118 20 09.60\n(viii) St. Croix, VI\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n18 29 15.36 64 22 38.28\n18 06 51.12 64 08 03.84\n18 04 31.44 64 06 12.24\n18 02 02.76 64 04 33.96\n17 59 26.52 64 03 09.36\n17 56 43.80 64 01 59.52\n17 53 56.04 64 01 04.80\n17 51 03.96 64 00 25.56\n17 48 09.72 64 00 02.16\n17 42 19.08 63 58 57.36\n17 39 07.92 63 58 15.96\n17 42 10.44 64 39 37.44\n17 43 57.00 64 50 46.32\n18 07 24.24 66 02 36.96\n18 16 13.80 65 44 56.04\n(ix) Hancock, NH\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n44 08 59.64 71 32 01.68\n43 46 24.60 71 18 57.60\n42 58 41.88 71 15 14.04\n42 29 25.08 71 52 51.96\n42 34 05.88 72 07 08.76\n42 34 41.52 72 09 41.76\n42 55 47.28 72 55 03.72\n(x) Mauna Kea, HI\nNorth latitude (deg/min/sec) West longitude (deg/min/sec)\n20 11 01.32 153 03 43.20\n20 00 52.92 152 35 56.40\n19 46 42.60 152 35 34.80\n19 32 33.36 152 36 28.80\n19 18 31.68 152 38 38.40\n19 04 44.04 152 42 07.20\n18 51 16.56 152 46 51.60\n18 38 15.72 152 52 44.40\n18 25 46.56 152 59 49.20\n18 13 55.20 153 07 55.20\n18 02 46.68 153 17 06.00\n17 52 26.40 153 27 14.40\n17 42 57.96 153 38 16.80\n17 35 20.04 153 50 45.60\n17 27 52.20 154 03 10.80\n17 21 27.00 154 16 15.60\n17 16 08.40 154 29 49.20\n17 11 57.84 154 43 51.60\n17 08 57.48 154 58 08.40\n17 07 09.12 155 12 43.20\n17 23 53.52 155 27 21.60\n19 29 13.92 155 36 21.60\n19 47 53.88 155 29 27.60\n19 48 52.92 155 27 39.60\n19 48 58.68 155 27 14.40\n(3) Operation within the band 608-614 MHz is prohibited within the following areas:\n(i) The National Radio Quiet Zone as defined in § 1.924(a)(1) of this chapter.\n(ii) The islands of Puerto Rico, Desecheo, Mona, Vieques or Culebra\n(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.\n(1) Fixed white space devices may only operate above 4 W EIRP in less congested areas as defined in § 15.703.\n(2) If a device operates between two defined power levels, it must comply with the separation distances for the higher power level.\n(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.\n(4) On frequencies used by wireless uplink services:\nMode II Personal/Portable White Space Devices\n600 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\n16 dBm (40 mW) 20 dBm (100 mW)\nCommunicating with Mode II or Fixed device 5 6\nCommunicating with Mode I device 10 12\nFixed White Space Devices\nAntenna height above average terrain of unlicensed devices (meters) 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*\n16 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)\nLess than 3 5 6 7 9 12 15 19\n3—10 9 11 14 17 22 27 34\n10—30 15 19 24 30 38 47 60\n30—50 20 24 31 38 49 60 60\n50—75 24 30 37 47 60 60 60\n75—100 27 34 43 54 60 60 60\n100—150 33 42 53 60 60 60 60\n150—200 39 49 60 60 60 60 60\n200-250 43 54 60 60 60 60 60\n*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.\nPersonal/Portable White Space Devices\n600 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\n20 dBm (100 mW)\nCommunicating with Mode II or Fixed device 0.1\nCommunicating with Mode I device 0.3\nFixed White Space Devices\nAntenna 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*\n20 dBm (100 mW) 24 dBm (250mW) 28 dBm (625 mW) 32 dBm (1600 mW) 36 dBm (4 W) 40 dBm (10 W)\nLess than 3 0.1 0.2 0.2 0.3 0.4 0.4\n3-10 0.3 0.3 0.4 0.5 0.6 0.8\n10-30 0.4 0.6 0.7 0.9 1.1 1.4\n30-50 0.6 0.7 0.9 1.2 1.4 1.8\n50-75 0.7 0.9 1.1 1.4 1.8 2.2\n75-100 0.8 1.0 1.3 1.6 2.0 2.6\n100-150 1.0 1.3 1.6 2.0 2.5 3.1\n150-200 1.2 1.4 1.8 2.3 2.9 3.6\n200-250 1.3 1.6 2.0 2.6 3.2 4.1\n*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.\n(5) On frequencies used by wireless downlink services: 35 kilometers for co-channel operation, and 31 kilometers for adjacent channel operation.\n(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) plus the distances specified in the tables in this paragraph (j)(1):\n(i) Mode II personal/portable white space devices.\nTable 23 to Paragraph (j)(1)(i)\nRequired co-channel separation distances in kilometers from edge of polygon\n16 dBm (40 mW)\nCommunicating with Mode II or Fixed device 0.38\nCommunicating with Mode I device 0.76\n(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.\nTable 24 to Paragraph (j)(1)(ii)\nAntenna height above average terrain of unlicensed devices (meters) Required co-channel separation distances in kilometers from edge of polygon\n16 dBm (40 mW)\nLess than 3 0.38\n3-10 0.70\n10-30 1.20\n30-50 1.55\n50-75 1.90\n75-100 2.20\n100-150 2.70\n150-200 3.15\n200-250 3.50\n(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) plus the distances specified in the tables in this paragraph (j)(2):\n(i) Mode II personal/portable white space devices.\nTable 25 to Paragraph (j)(2)(i)\nRequired adjacent channel separation distances in meters from edge of polygon\n16 dBm (40 mW) 20 dBm (100 mW)\nCommunicating with Mode II or Fixed device 8 13\nCommunicating with Mode I device 16 26\n(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.\nTable 26 to Paragraph (j)(2)(ii)\nRequired adjacent channel separation distances in meters from edge of polygon\n16 dBm (40 mW) 20 dBm (100 mW) 24 dBm (250 mW) 28 dBm (625 mW) 32 dBm (1600 mW) 36 dBm (4 watts)\n8 13 20 32 50 71\n(k) 488-494 MHz band in Hawaii. White space devices are not permitted to operate in the 488-494 MHz band in Hawaii.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER A—GENERAL","PART 15—RADIO FREQUENCY DEVICES","Subpart H—White Space Devices"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-47.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:28Z","sha256":"b9610f81ee2da22b3c88e9e5472bdc863dc93c269da1f47bd2cab599f51da63f","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-15.711","next":"us/47-cfr-15.713"},"notice":"GroundRules: Original legal text. Not legal advice."}