Goto Section: 90.233 | 90.237 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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 § 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 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 2 second message duration and 3 message repetition
(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 § § 90.137(b), 90.425, and
(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 § § 90.317(a), 90.557 and 90.637 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; 72 FR 35195 , June 27, 2007; 72 FR 44424 , Aug. 8, 2007; 79 FR 39339 , July 10, 2014]
Goto Section: 90.233 | 90.237
Goto Year: 2020 |
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