§ 74.803   Frequency selection to avoid interference.

   (a) Where two or more low power auxiliary licensees need to operate in
   the same area, the licensees shall endeavor to select frequencies or
   schedule operation in such manner as to avoid mutual interference. If a
   mutually satisfactory arrangement cannot be reached, the Commission
   shall be notified and it will specify the frequency or frequencies to
   be employed by each licensee.

   (b) The selection of frequencies in the bands allocated for TV
   broadcasting for use in any area shall be guided by the need to avoid
   interference to TV broadcast reception. In these bands, low power
   auxiliary station usage is secondary to TV broadcasting and land mobile
   stations operating in the UHF-TV spectrum and must not cause harmful
   interference. If such interference occurs, low power auxiliary station
   operation must immediately cease and may not be resumed until the
   interference problem has been resolved.

   (c) In the 941.500-952.000 MHz, 952.850-956.250 MHz, 956.45-959.85 MHz,
   6875.000-6900.000 MHz, and 7100.000-7125.000 MHz bands low power
   auxiliary station usage is secondary to other uses (e.g., Aural
   Broadcast Auxiliary, Television Broadcast Auxiliary, Cable Relay
   Service, Fixed Point to Point Microwave) and must not cause harmful
   interference. Applicants are responsible for selecting the frequency
   assignments that are least likely to result in mutual interference with
   other licensees in the same area. Applicants must consult local
   frequency coordination committees, where they exist, for information on
   frequencies available in the area. In selecting frequencies,
   consideration should be given to the relative location of receive
   points, normal transmission paths, and the nature of the contemplated
   operation.

   (d) In the 1435-1525 MHz band, low power auxiliary stations (LPAS) are
   limited to operations at specific fixed locations that have been
   coordinated with the frequency coordinator for aeronautical mobile
   telemetry, the Aerospace and Flight Test Radio Coordinating Committee.
   LPAS devices must complete authentication and location verification
   before operation begins, employ software-based controls or similar
   functionality to prevent devices in the band from operating except in
   the specific channels, locations, and time periods that have been
   coordinated, and be capable of being tuned to any frequency in the
   band. Use is limited to situations where there is a need to deploy
   large numbers of LPAS for specified time periods, and use of other
   available spectrum resources is insufficient to meet the LPAS
   licensee's needs at the specific location. All LPAS devices operating
   in a particular area in the band may have access to no more than 30
   megahertz of spectrum in the band at a given time.

   [ 42 FR 14729 , Mar. 16, 1977, as amended at  52 FR 2535 , Jan. 23, 1987;
    80 FR 71728 , Nov. 17, 2015]

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