Sec. 73.757  Auxiliary transmitters.

    Upon showing that a need exists for the use of auxiliary 
transmitters, a license may be issued provided that:
    (a) Auxiliary transmitters may be installed either at the same 
location as the main transmitters or at another location.
    (b) [Reserved]
    (c) The auxiliary transmitters shall be maintained so that they may 
be put into immediate operation at any time for the following purposes:
    (1) The transmission of the regular programs upon the failure of the 
main transmitters.
    (2) The transmission of regular programs during maintenance or 
modification work on the main transmitter, necessitating discontinuance 
of its operation for a period not to exceed 5 days. (This includes the 
equipment changes which may be made without authority as set forth 
elsewhere in the rules and regulations or as authorized by the 
Commission by letter or by construction permit. Where such operation is 
required for periods in excess of 5 days, request therefor shall be in 
accordance with Sec. 73.3542 of this chapter.)
    (3) Upon request by a duly authorized representative of the 
Commission.
    (d) The auxiliary transmitters shall be tested at least once each 
week to determine that they are in proper operating condition and that 
they are adjusted to the proper frequency except that in the case of 
operation in accordance with paragraph (c) of this section during any 
week, the test in that week may be omitted provided the operation under 
paragraph (c) of this section is satisfactory. A record shall be kept of 
the time and result of each test. Such records shall be retained for a 
period of two years.
    (e) The auxiliary transmitters shall be equipped with satisfactory 
control equipment which will enable the maintenance of the frequency 
emitted by the station within the limits prescribed by the regulations 
in this part.
    (f) The operating power of an auxiliary transmitter may be less but 
not greater than the authorized power of the main transmitters.

[ 28 FR 13696 , Dec. 14, 1963, as amended at  37 FR 25843 , Dec. 5, 1972;  60 FR 55480 , Nov. 1, 1995]