Goto Section: 90.423 | 90.427 | Table of Contents
FCC 90.425
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 90.425 Station identification.
Stations licensed under this part shall transmit identification in
accordance with the following provisions:
(a) Identification procedure. Except as provided for in paragraphs (d) and
(e) of this section, each station or system shall be identified by the
transmission of the assigned call sign during each transmission or exchange
of transmissions, or once each 15 minutes (30 minutes in the Public Safety
Pool) during periods of continuous operation. The call sign shall be
transmitted by voice in the English language or by International Morse Code
in accordance with paragraph (b) of this section. If the station is
employing either analog or digital voice scrambling, or non-voice emission,
transmission of the required identification shall be in the unscrambled mode
using A3E, F3E or G3E emission, or International Morse, with all encoding
disabled. Permissible alternative identification procedures are as follows:
(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) Use of an identifier other than the assigned call sign. (i) In the
Public Safety Pool, mobile units licensed to a governmental entity and which
operate on frequencies above 30 MHz may use an identifier which contains, at
a minimum, the name of the licensee if the licensee maintains at the station
a list of the special identifiers to be used by the mobile units.
(ii) In the Industrial/Business Pool, licensees may request the Commission's
Wireless Telecommunications Bureau 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 is 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, provided that a list of such
identifiers is maintained by the railroad. An abbreviated name or the
initials of the railroad may be used where such are in general usage. In
those areas where it is shown that no difficulty would be encountered in
identifying the transmission of a particular station (as, for example, where
stations of one licensee are located in a yard isolated from other radio
installations), approval may be given to a request from the licensee for
permission to omit the station identification.
(5) Use of identifiers in addition to assigned call signs. Nothing in this
section shall be construed as prohibiting the transmission of station or
unit identifiers which may be necessary or desirable for system operation,
provided that they are transmitted in addition to the assigned station call
sign or other permissible form of identification.
(b) Use of automatic Morse code identification equipment. Automatically
activated equipment may be used to transmit station identification in
International Morse Code pursuant to the following conditions:
(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) Special provisions for identification in the Radiolocation Service. (1)
Stations in the Radiolocation Service are not required to identify except
upon specific instruction from the Commission or as required by paragraph
(c)(2) of this section.
(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) General exemptions. A station need not transmit identification if:
(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 commonly owned facilities that are
operated as part of a single system. The call sign must be transmitted each
hour within five minutes of the hour, or upon completion of the first
transmission after the hour.
(3) CMRS stations granted exclusive channels may transmit their call signs
digitally. A licensee that identifies its call sign in this manner must
provide the Commission, upon request, information sufficient to decode the
digital transmission and ascertain the call sign transmitted.
(f) Special provisions for stations licensed under this part that are not
classified as CMRS providers under part 20 of this chapter.
(1) Stations subject to a station identification requirement will be
permitted to use a single call sign for commonly owned facilities that are
operated as part of a single system.
(2) Stations licensed on an exclusive basis in the bands between 150 and 512
MHz that normally employ digital signals for the transmission of data, text,
control codes, or digitized voice may be identified by digital transmission
of the call sign. A licensee that identifies its call sign in this manner
must provide the Commission, upon request, information sufficient to decode
the digital transmission and ascertain the call sign transmitted.
[ 43 FR 54791 , Nov. 22, 1978]
Editorial Note: For Federal Register citations affecting § 90.425, see the
List of CFR Sections Affected, which appears in the Finding Aids section of
the printed volume and at www.fdsys.gov.
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Goto Section: 90.423 | 90.427
Goto Year: 2014 |
2016
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