47 C.F.R. § 27.1221   Interference protection.


Title 47 - Telecommunication


Title 47: Telecommunication
PART 27—MISCELLANEOUS WIRELESS COMMUNICATIONS SERVICES
Subpart M—Broadband Radio Service and Educational Broadband Service
Technical Standards

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§ 27.1221   Interference protection.

(a) Interference protection will be afforded to BRS and EBS on a station-by-station basis based on the heights of the stations in the LBS and UBS and also on height benchmarking, although the heights of antennas utilized are not restricted.

(b) Height Benchmarking. Height benchmarking is defined for pairs of base stations, one in each of two neighboring service areas. The height benchmark for a particular station in a service area relative to a base station in an adjacent service area is the distance'squared between the station and the GSA service area boundary measured along the radial between the respective stations, divided by 17. That is, the height benchmark is hb = D2 /17. Interference protection will be afforded on a station by station basis based on the actual antenna height above the radial average terrain (calculated along the straight line between the two base stations in accordance with §24.53(b) and (c) of this chapter) and this height benchmark.

(c) Protection for a Receiving-Antenna not Exceeding the Height Benchmark. A base station receive-antenna with an HAAT less than or equal to the height benchmark relative to a neighbor's transmitting base station will be protected if that station's HAAT exceeds its height benchmark. That station is required to take such measures to limit the undesired signal at the receiving base station to −109dBm or less.

(d) No Protection from a Transmitting-Antenna not Exceeding the Height Benchmark. A base station transmitting-antenna with an HAAT less than or equal to the height benchmark relative to a neighbor's receiving antenna is not required to protect that receiving station, regardless of the HAAT of that station.

(e) No Protection for a Receiving-Antenna Exceeding the Height Benchmark. A base station transmitting-antenna with an HAAT greater than the height benchmark relative to a neighbor's receiving antenna is not required to protect that receiving antenna if its HAAT is greater than its height benchmark.

[69 FR 72034, Dec. 10, 2004, as amended at 70 FR 1190, Jan. 6, 2005; 71 FR 35191, June 19, 2006]

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