Goto Section: 74.1237 | 74.1251 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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 certified 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 authorized
via Supplier's Declaration of Conformity or approved under the
provisions of part 73 of this chapter.
Note 1 to paragraph (a): The Declaration of Conformity procedure has
been replaced by Supplier's Declaration of Conformity. Equipment
previously authorized under subpart J of part 2 of this chapter may
remain in use. See § 2.950 of this chapter.
(b) Transmitting antennas, antennas used to receive signals to be
rebroadcast, and transmission lines are not subject to the requirement
(c) The following requirements must be met before translator, booster
or exciter equipment will be certified in accordance with this section:
(1) Radio frequency harmonics and spurious emissions must conform with
the specifications of § 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 § 74.1261 of this
(3) The apparatus shall contain automatic circuits to maintain the
power output in conformance with § 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
§ 74.1263(b) of this part and to transmit the call sign in conformance
with § 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;
82 FR 50836 , Nov. 2, 2017]
Goto Section: 74.1237 | 74.1251
Goto Year: 2020 |
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