§ 80.221   Special requirements for automatically generating the radiotelephone
alarm signal.

   (a) Each device for automatically generating the radiotelephone alarm signal
   must be capable of being disabled to permit the immediate transmission of a
   distress call and message.

   (b) The device must comply with the following requirements:

   (1) The frequency tolerance of each tone must be ±1.5 percent;

   (2) The duration tolerance of each tone must be ±50 milliseconds;

   (3) The interval between successive tones must not exceed 50 milliseconds;
   and

   (4) The amplitude ratio of the tones must be flat within 1.6 dB.

   (c) Devices installed on or after January 1, 1983, must comply with the
   following requirements:

   (1) The frequency tolerance of each tone must be ±1.5 percent;

   (2) The duration tolerance of each tone must be ±10 milliseconds;

   (3) The interval between successive tones must not exceed 4 milliseconds;

   (4) The amplitude ratio of the tones must be flat within 1.6 dB;

   (5) The output of the device must be sufficient to modulate the associated
   transmitter for H2B emission to at least 70 percent, and for J2B emission to
   within 3 dB of the rated peak envelope power;

   (6) Light from the device must not interfere with the safe navigation of the
   ship;

   (7)  After  activation  the  device  must  automatically  generate the
   radiotelephone alarm signal for not less than 30 seconds and not more than
   60 seconds unless manually interrupted;

   (8)  After  generating the radiotelephone alarm signal or after manual
   interruption the device must be immediately ready to repeat the signal;

   (9)  The  transmitter must be automatically switched from the stand-by
   condition to the transmit condition at the start and return to the stand-by
   condition at the conclusion of the radiotelephone alarm signal.

   (d)  Any  device  used  by  a  station  to  automatically generate the
   radiotelephone alarm signal must be certificated by the Commission.

   [ 51 FR 31213 , Sept. 2, 1986, as amended at  54 FR 40059 , Sept. 29, 1989;  63 FR 36606 , July 7, 1998]

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