Goto Section: 73.316 | 73.318 | Table of Contents
FCC 73.317
Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 73.317 FM transmission system requirements.
(a) FM broadcast stations employing transmitters authorized after January 1,
1960, must maintain the bandwidth occupied by their emissions in accordance
with the specification detailed below. FM broadcast stations employing
transmitters installed or type accepted before January 1, 1960, must achieve
the highest degree of compliance with these specifications practicable with
their existing equipment. In either case, should harmful interference to
other authorized stations occur, the licensee shall correct the problem
promptly or cease operation.
(b) Any emission appearing on a frequency removed from the carrier by
between 120 kHz and 240 kHz inclusive must be attenuated at least 25 dB
below the level of the unmodulated carrier. Compliance with this requirement
will be deemed to show the occupied bandwidth to be 240 kHz or less.
(c) Any emission appearing on a frequency removed from the carrier by more
than 240 kHz and up to and including 600 kHz must be attenuated at least 35
dB below the level of the unmodulated carrier.
(d) Any emission appearing on a frequency removed from the carrier by more
than 600 kHz must be attenuated at least 43 + 10 Log[10] (Power, in watts)
dB below the level of the unmodulated carrier, or 80 dB, whichever is the
lesser attenuation.
(e) Preemphasis shall not be greater than the impedance-frequency
characteristics of a series inductance resistance network having a time
constant of 75 microseconds. (See upper curve of Figure 2 of Sec. 73.333.)
[ 51 FR 17028 , May 8, 1986]
Goto Section: 73.316 | 73.318
Goto Year: 2005 |
2007
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