Goto Section: 74.1237 | 74.1251 | Table of Contents
FCC 74.1250
Revised as of October 1, 2008
Goto Year:2007 |
2009
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 certificated upon the request of any manufacturer of
transmitters in accordance with this section and subpart J of part 2 of this
chapter. In addition, FM translator and booster stations may use FM
broadcast transmitting apparatus verified or approved 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
certification.
(c) The following requirements must be met before translator, booster or
exciter equipment will be certificated 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, as amended at 63 FR 36606 , July 7, 1998]
Goto Section: 74.1237 | 74.1251
Goto Year: 2007 |
2009
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