[Code of Federal Regulations]

[Title 47, Volume 5]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 47CFR90.235]



[Page 351-352]

 

                       TITLE 47--TELECOMMUNICATION

 

                         COMMISSION (CONTINUED)

 

PART 90_PRIVATE LAND MOBILE RADIO SERVICES--Table of Contents

 

          Subpart J_Non-Voice and Other Specialized Operations

 

Sec. 90.235  Secondary fixed signaling operations.



    Fixed operations may, subject to the following conditions, be 

authorized on a secondary basis for voice, tone or impulse signaling on 

a licensee's mobile service frequency(ies) above 25 MHz within the area 

normally covered by the licensee's mobile system. Voice signaling will 

be permitted only in the Public Safety Pool.

    (a) The bandwidth shall not exceed that authorized to the licensee 

for the primary operations on the frequency concerned.

    (b) The output power shall not exceed 30 watts at the remote site.

    (c) A1D, A2D, F1D, F2D, G1D and G2D emissions may be authorized. In 

the Police Radio Service, A3E, F1E, F2E, F3E, G1E, G2E, or G3E emissions 

may also be authorized.

    (d) Except for those systems covered under paragraph (e) of this 

section, the maximum duration of any non-voice signaling transmission 

shall not exceed 2 seconds and shall not be repeated more than 3 times. 

Signaling transmissions may be staggered at any interval or may be 

continuous. In the Public Safety Pool, the maximum duration of any voice 

signaling transmission shall not exceed 6 seconds and shall not be 

repeated more than 3 times.

    (e) Until December 31, 1999, for systems in the Public Safety Pool 

authorized prior to June 20, 1975, and Power and Petroleum licensees as 

defined in Sec. 90.7 authorized prior to June 1, 1976, the maximum 

duration of any signaling transmission shall not exceed 6 seconds and 

shall not be repeated more than 5 times. For Power licensees authorized 

between June 1, 1976, and August 14, 1989, signaling duration shall not 

exceed 2 seconds and shall not be



[[Page 352]]



repeated more than 5 times. Such systems include existing facilities and 

additional facilities which may be authorized as a clear and direct 

expansion of existing facilities. After December 31, 1999, all signaling 

systems shall be required to comply with the two second message duration 

and three message repetition requirements.

    (f) Systems employing automatic interrogation shall be limited to 

non-voice techniques and shall not be activated for this purpose more 

than 10 seconds out of any 60 second period. This 10 second timeframe 

includes both transmit and response times.

    (g) Automatic means shall be provided to deactivate the transmitter 

in the event the r.f. carrier remains on for a period in excess of 3 

minutes or if a transmission for the same signaling function is repeated 

consecutively more than five times.

    (h) Fixed stations authorized pursuant to the provisions of this 

section are exempt from the requirements of Sec. Sec. 90.137(b), 

90.425, and 90.429.

    (i) Base, mobile, or mobile relay stations may transmit secondary 

signaling transmissions to receivers at fixed locations subject to the 

conditions set forth in this section.

    (j) Under the provisions of this section, a mobile service frequency 

may not be used exclusively for secondary signaling.

    (k) The use of secondary signaling will not be considered in whole 

or in part as a justification for authorizing additional frequencies in 

a licensee's land mobile radio system.

    (l) Secondary fixed signaling operations conducted in accordance 

with the provisions of Sec. Sec. 90.317(a), or 90.637(c), or 90.731 are 

exempt from the foregoing provisions of this section.



[54 FR 28679, July 7, 1989, as amended at 57 FR 34693, Aug. 6, 1992; 58 

FR 30996, May 28, 1993; 60 FR 50123, Sept. 28, 1995; 62 FR 18927, Apr. 

17, 1997]