Stations licensed under this part shall transmit identification in accordance with the following provisions:
(a)
(1) A mobile relay stations call sign may be used to identify the associated control and mobile stations, except in the Public Safety Pool where the stations operate on frequencies below 450 MHz. Alternatively, a base station (including a mobile relay station) which is controlled by radio may be identified by the transmission of the call sign of the station at which communications originate.
(2) One or more fixed relay stations may be identified by the transmission of the call signs of the stations at which the communications originate.
(3) When a mobile station transmits on a different frequency than its associated base station, the assigned call sign of either the mobile station or the base station may be transmitted. Further, a single mobile unit in the licensee's authorized geographic area of operation may transmit station identification on behalf of any other operating mobile units in the fleet.
(4)
(ii) In the Industrial/Business Pool, licensees may request the Commission's local Engineer-in-Charge to approve the use of special mobile unit identifiers in lieu of the assigned call sign. Such requests, however, will not be granted where it appears that harmful interference to international operations may be caused by stations below 50 MHz, or by stations operating in areas within 80 km (50 miles) of an international boundary, or where it appears that the proposed method of identification will not adequately distinguish the mobile units of the applicant from the mobile units of other licensees in the area.
(iii) In the Industrial/Business Pool, railroad licensees (as defined in § 90.7) may identify stations by the name of the railroad and the train number, caboose number, engine number, or the name of the fixed wayside station. If none of these forms are practicable, any similar name or number may be designated by the railroad concerned for use by its employees in the identification of fixed points or mobile units;
(5)
(b)
(1) The signal output of the automatic identification equipment shall be connected to the transmitter at the microphone input or any other manufacturer-provided signal input terminal and shall be adjusted to produce 40 percent ±10 percent of the maximum permissible modulation or deviation level. This adjustment shall be performed when all other modulating signals are absent.
(2) The Morse code transmission rate shall be maintained between 20 and 25 words per minute.
(3) The frequency of the keyed tone comprising the identification signal shall be 1200 ±800 Hz. A licensee may be required to change the frequency in order to prevent interference to the operations of another co-channel licensee.
(4) Should activation of automatic Morse code identification equipment interrupt the communications of another co-channel licensee, the Commission may require the use of equipment which will delay automatic station identification until such co-channel communications are completed.
(c)
(2) Stations in the Radiolocation Service operating on frequencies above 3400 kHz that employ spread spectrum techniques shall transmit a two-letter manufacturer's designator, authorized by the Commission on the station authorization, at the beginning and ending of each transmission and once every 15 minutes during periods of continuing operation. The designator shall be transmitted in International Morse Code at a speed not exceeding 25 words per minute, and the spread spectrum mode of operation shall be maintained while the designator is being transmitted. The identifying signal shall be clearly receivable in the demodulated audio of a narrow-band FM receiver.
(d)
(1) It is a mobile station operating on the transmitting frequency of the associated base station.
(2) It is a mobile station in the Public Safety Pool using F1E or G1E emission.
(3) It is transmitting for telemetering purposes or for the activation of devices which are employed solely as a means of attracting attention, or for remote control purposes, or which is retransmitting by self-actuating means, a radio signal received from another radio station or stations.
(4) It is any type of radiopositioning or radar station authorized in a service other than the Radiolocation Service.
(5) It is used solely for automatic vehicle monitoring or location.
(6) It is a paging station authorized in accordance with the provisions of § 90.20(a)(2)(v).
(7) It is a mobile station employing non-voice emissions and the associated base station identifies on behalf of the mobile unit(s).
(8) It is a base or mobile station in the 220-222 MHz band authorized to operate on a nationwide basis in accordance with subpart T of this part.
(9) It is a wireless microphone station operating in accordance with the provisions of § 90.265(b).
(10) It is a Roadside Unit in a DSRCS system.
(e) Special provisions for stations licensed under this part that are classified as CMRS providers under part 20 of this chapter.
(1) Station identification will not be required for 929-930 MHz nationwide paging licensees or MTA or EA-based SMR licensees. All other CMRS stations will be required to comply with the station identification requirements of this paragraph.
(2) CMRS stations subject to a station identification requirement will be permitted to use a single call sign for
(3) CMRS stations granted exclusive channels may transmit their call signs digitally. The station licensee must provide the Commission with information sufficient to decode the digital transmission to ascertain the transmitted call sign.
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