Sec. 90.647  Station identification.

    (a) Conventional systems of communication shall be identified in 
accordance with existing regulations governing such matters.
    (b) Trunked systems of communication, except as noted in paragraph 
(c) of this section, shall be identified through the use of an automatic 
device which transmits the call sign of the base station facility at 30 
minute intervals. Such station identification shall be made on the 
lowest frequency in the base station trunk group assigned the licensee. 
Should this frequency be in use at the time station identification is 
required, such identification may be made at the termination of the 
communication in progress on this frequency. Identification may be made 
by voice or International Morse Code. When the call sign is transmitted 
in International Morse Code, it must be at a rate of between 15 to 20 
words per minute and by means of tone modulation of the transmitter, the 
tone frequency being between 800 and 1000 hertz.
    (c) Stations operating in either the 806-824/851-869 MHz or 896-901/
935-940 MHz bands that are licensed on an exclusive basis, and normally 
employ digital signals for the transmission of data, text, control 
codes, or digitized voice may also be identified by digital transmission 
of the call sign. A licensee that identifies its station in this manner 
must provide the Commission, upon its request, information sufficient to 
decode the digital transmission and ascertain the call sign transmitted.
[ 47 FR 41032 , Sept. 16, 1982, as amended at  58 FR 12177 , Mar. 3, 1993]

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