Sec. 74.1250  Transmitters and associated equipment.

    (a) FM translator and booster transmitting apparatus, and exciters 
employed to provide a locally generated and modulated input signal to 
translator and booster equipment, used by stations authorized under the 
provisions of this subpart must be type accepted or notified upon the 
request of any manufacturer of transmitters in accordance with this 
section and subpart J of part 2 of this chapter. If acceptable, the 
apparatus will be included in the FCC's ``Radio Equipment List, 
Equipment Acceptable for Licensing.'' In addition, FM translator and 
booster stations may use FM broadcast transmitting apparatus notified or 
type accepted under the provisions of part 73 of this chapter.
    (b) Transmitting antennas, antennas used to receive signals to be 
rebroadcast, and transmission lines are not subject to the requirement 
for type acceptance.
    (c) The following requirements must be met before translator, 
booster or exciter equipment will be notified or type accepted in 
accordance with this section:
    (1) Radio frequency harmonics and spurious emissions must conform 
with the specifications of Sec. 74.1236 of this part.
    (2) The local oscillator or oscillators, including those in an 
exciter employed to provide a locally generated and modulated input 
signal to a translator or booster, when subjected to variations in 
ambient temperature between minus 30 degrees and plus 50 degrees 
centigrade, and in primary supply voltage between 85 percent and 115 
percent of the rated value, shall be sufficiently stable to maintain the 
output center frequency within plus or minus 0.005 percent of the 
operating frequency and to enable conformance with the specifications of 
Sec. 74.1261 of this part.
    (3) The apparatus shall contain automatic circuits to maintain the 
power output in conformance with Sec. 74.1235(e) of this part. If 
provision is included for adjusting the power output, then the normal 
operating constants shall be specified for operation at both the rated 
power output and the minimum power output at which the apparatus is 
designed to operate. The apparatus shall be equipped with suitable 
meters or meter jacks so that the operating constants can be measured 
while the apparatus is in operation.
    (4) Apparatus rated for transmitter power output of more than 1 watt 
shall be equipped with automatic circuits to place it in a nonradiating 
condition when no input signal is being received in conformance with 
Sec. 74.1263(b) of this part and to transmit the call sign in 
conformance with Sec. 74.1283(c)(2) of this part.
    (5) For exciters, automatic means shall be provided for limiting the 
level of the audio frequency voltage applied to the modulator to ensure 
that a frequency swing in excess of 75 kHz will not occur under any 
condition of the modulation.

[ 55 FR 50698 , Dec. 10, 1990]