{"data":{"id":"us/47-cfr-80.221","jurisdiction":"us","citation":"47 CFR 80.221","heading":"Special requirements for automatically generating the radiotelephone alarm signal.","body":"(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.\n(b) The device must comply with the following requirements:\n(1) The frequency tolerance of each tone must be ±1.5 percent;\n(2) The duration tolerance of each tone must be ±50 milliseconds;\n(3) The interval between successive tones must not exceed 50 milliseconds; and\n(4) The amplitude ratio of the tones must be flat within 1.6 dB.\n(c) Devices installed on or after January 1, 1983, must comply with the following requirements:\n(1) The frequency tolerance of each tone must be ±1.5 percent;\n(2) The duration tolerance of each tone must be ±10 milliseconds;\n(3) The interval between successive tones must not exceed 4 milliseconds;\n(4) The amplitude ratio of the tones must be flat within 1.6 dB;\n(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;\n(6) Light from the device must not interfere with the safe navigation of the ship;\n(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;\n(8) After generating the radiotelephone alarm signal or after manual interruption the device must be immediately ready to repeat the signal;\n(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.\n(d) Any device used by a station to automatically generate the radiotelephone alarm signal must be certificated by the Commission.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 80—STATIONS IN THE MARITIME SERVICES","Subpart E—General Technical Standards"],"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":"952c5464c5460d1fc5fa6cf9fa102bb3d6f8dada48c1ed6f008982dde38518ed","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-80.219","next":"us/47-cfr-80.223"},"notice":"GroundRules: Original legal text. Not legal advice."}