47 CFR 73.317 - FM transmission system requirements.

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§ 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 Log10 (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 § 73.333.)
[51 FR 17028, May 8, 1986]

Title 47 published on 2013-10-01

The following are only the Rules published in the Federal Register after the published date of Title 47.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-10-21; vol. 79 # 203 - Tuesday, October 21, 2014
    1. 79 FR 62883 - Radio Broadcasting Services; Centerville, Texas
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      FEDERAL COMMUNICATIONS COMMISSION
      Final rule.
      Effective November 3, 2014.
      47 CFR Part 73

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United States Code

Title 47 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 47 CFR 73 after this date.

  • 2014-10-27; vol. 79 # 207 - Monday, October 27, 2014
    1. 79 FR 63883 - Petitions for Reconsideration of Action in Rulemaking Proceeding
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      FEDERAL COMMUNICATIONS COMMISSION
      Petition for reconsideration.
      Oppositions to the Petitions must be filed on or before November 12, 2014. Replies to an opposition must be filed on or before November 21, 2014.
      47 CFR Parts 0, 1, 2, 15, 27, 73, and 74