§ 90.559   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 the 769-775/799-805 MHz band 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.

   [ 79 FR 39341 , July 10, 2014]

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Subpart S—Regulations Governing Licensing and Use of Frequencies in the
806-824, 851-869, 896-901, and 935-940 MHz Bands

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