{"data":{"id":"us/47-cfr-80.74","jurisdiction":"us","citation":"47 CFR 80.74","heading":"Public coast station facilities for a telephony busy signal.","body":"A “busy” signal, when used by a public coast station in accordance with the provisions of § 80.111(d), must consist of the transmission of a single audio frequency regularly interrupted, as follows:\n(a) Audio frequency. Not less than 100 nor more than 1100 Hertz, provided the frequency used for this purpose will not cause auto alarms or selective-ringing devices to be operated.\n(b) Rate of interruption. 60 times per minute ±10%.\n(c) Duration of each interruption. 0.5 second ±10%.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 80—STATIONS IN THE MARITIME SERVICES","Subpart C—Operating Requirements and Procedures"],"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":"1e58f047bb47709302f4d5a8b0da04842c64983a17d181c795c3f6599c2b5b48","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-80.72","next":"us/47-cfr-80.76"},"notice":"GroundRules: Original legal text. Not legal advice."}