§80.74. Public coast station facilities for a telephony busy signal.
47 C.F.R. § 80.74
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:
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.
Rate of interruption. 60 times per minute ±10%.
Duration of each interruption. 0.5 second ±10%.
Notes, amendments, and revision history
Authority
Authority: 47 U.S.C. 151-155, 301-609; 3 U.S.T. 3450, 3 U.S.T. 4726, 12 U.S.T. 2377.
Source
Source: 51 FR 31213, Sept. 2, 1986, unless otherwise noted.