[Code of Federal Regulations]

[Title 47, Volume 2]

[Revised as of October 1, 2004]

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

[CITE: 47CFR21.118]



[Page 57]

 

                       TITLE 47--TELECOMMUNICATION

 

                    CHAPTER I--FEDERAL COMMUNICATIONS

                         COMMISSION (CONTINUED)

 

PART 21_DOMESTIC PUBLIC FIXED RADIO SERVICES--Table of Contents

 

                      Subpart C_Technical Standards

 

Sec. 21.118  Transmitter construction and installation.



    (a) The equipment at the operating and transmitting positions shall 

be so installed and protected that it is not accessible to, or capable 

of being operated by, persons other than those duly authorized by the 

licensee.

    (b) In any case where the maximum modulating frequency of a 

transmitter is prescribed by the Commission, the transmitter shall be 

equipped with a low-pass or band-pass modulation filter of suitable 

performance characteristics. In those cases where a modulation limiter 

is employed, the modulation filter shall be installed between the 

transmitter stage in which limiting is effected and the modulated stage 

of the transmitter.

    (c) Each transmitter employed in these services shall be equipped 

with an appropriately labeled pilot lamp or meter which will provide 

continuous visual indication at the transmitter when its control 

circuits have been placed in a condition to activate the transmitter. 

Such requirement will not be applicable to MDS response stations or MDS 

booster stations authorized pursuant to Sec. 21.913(e). In addition, 

facilities shall be provided at each transmitter to permit the 

transmitter to be turned on and off independently of any remote control 

circuits associated therewith.

    (d) [Reserved]

    (e) At each transmitter control point the following facilities shall 

be installed:

    (1) A carrier operated device which will provide continuous visual 

indication when the transmitter is radiating, or, in lieu thereof, a 

pilot lamp or meter which will provide continuous visual indication when 

the transmitter control circuits have been placed in a condition to 

activate the transmitter.

    (2) Facilities which will permit the operator to turn transmitter 

carrier on and off at will.

    (f) Transmitter control circuits from any control point shall be so 

installed that grounding or shorting any line in the control circuit 

will not cause the transmitter to radiate: Provided, however, That this 

provision shall not be applicable to control circuits of stations which 

normally operate with continuous radiation or to control circuits which 

are under the effective operational control of responsible operating 

personnel 24 hours per day.



[44 FR 60534, Oct. 19, 1979, as amended at 52 FR 37783, Oct. 9, 1987; 63 

FR 65101, Nov. 25, 1998]