§  87.145   Acceptability of transmitters for licensing.

   (a) Each transmitter must be certificated for use in these services,
   except as listed in paragraph (c) of this section. However, aircraft
   stations which transmit on maritime mobile frequencies must use
   transmitters certificated for use in ship stations in accordance with
   part 80 of this chapter. Certification under part 80 is not required
   for aircraft earth stations transmitting on maritime mobile-satellite
   frequencies. Such stations must be certificated under part 87.

   (b) Some radio equipment installed on air carrier aircraft must meet
   the requirements of the Commission and the requirements of the FAA. The
   FAA requirements may be obtained from the FAA, Aircraft Maintenance
   Division, 800 Independence Ave., SW., Washington, DC 20591.

   (c) The equipment listed below is exempted from certification. The
   operation of transmitters which have not been certificated must not
   result in harmful interference due to the failure of those transmitters
   to comply with technical standards of this subpart.

   (1) Flight test station transmitters for limited periods where
   justified.

   (2) U.S. Government transmitters furnished in the performance of a U.S.
   Government contract if the use of certificated equipment would increase
   the cost of the contract or if the transmitter will be incorporated in
   the finished product. However, such equipment must meet the technical
   standards contained in this subpart.

   (3) ELTs verified in accordance with § 87.147(e).

   (4) Signal generators when used as radionavigation land test stations
   (MTF).

   (d) Aircraft earth stations must correct their transmit frequencies for
   Doppler effect relative to the satellite. The transmitted signal may
   not deviate more than 335 Hz from the desired transmit frequency. (This
   is a root sum square error which assumes zero error for the received
   ground earth station signal and includes the AES transmit/receive
   frequency reference error and the AES automatic frequency control
   residual errors.) The applicant must attest that the equipment provides
   adequate Doppler effect compensation and where applicable, that
   measurements have been made that demonstrate compliance. Submission of
   data demonstrating compliance is not required unless requested by the
   Commission.

   [ 63 FR 36607 , July 7, 1998, as amended at  69 FR 32881 , June 14, 2004]