47 CFR 24.133 - Emission limits.

§ 24.133 Emission limits.
(a) The power of any emission shall be attenuated below the transmitter power (P), as measured in accordance with § 24.132(f), in accordance with the following schedule:
(1) For transmitters authorized a bandwidth greater than 10 kHz:
(i) On any frequency outside the authorized bandwidth and removed from the edge of the authorized bandwidth by a displacement frequency (fd in kHz) of up to and including 40 kHz: at least 116 Log10 ((fd 10)/6.1) decibels or 50 plus 10 Log10 (P) decibels or 70 decibels, whichever is the lesser attenuation;
(ii) On any frequency outside the authorized bandwidth and removed from the edge of the authorized bandwidth by a displacement frequency (fd in kHz) of more than 40 kHz: at least 43 10 Log10 (P) decibels or 80 decibels, whichever is the lesser attenuation.
(2) For transmitters authorized a bandwidth of 10 kHz:
(i) On any frequency outside the authorized bandwidth and removed from the edge of the authorized bandwidth by a displacement frequency (fd in kHz) of up to and including 20 kHz: at least 116 × Log10 ((fd 5)/3.05) decibels or 50 10×Log10 (P) decibels or 70 decibels, whichever is the lesser attenuation;
(ii) On any frequency outside the authorized bandwidth and removed from the edge of the authorized bandwidth by a displacement frequency (fd in kHz) of more than 20 kHz: at least 43 10 Log 10 (P) decibels or 80 decibels, whichever is the lesser attenuation.
(b) The measurements of emission power can be expressed in peak or average values provided they are expressed in the same parameters as the transmitter power.
(c) When an emission outside of the authorized bandwidth causes harmful interference, the Commission may, at its discretion, require greater attenuation than specified in this section.
(d) The following minimum spectrum analyzer resolution bandwidth settings will be used: 300 Hz when showing compliance with paragraphs (a)(1)(i) and (a)(2)(i) of this section; and 30 kHz when showing compliance with paragraphs (a)(1)(ii) and (a)(2)(ii) of this section.
[58 FR 59183, Nov. 8, 1993. Redesignated at 59 FR 18499, April 19, 1994, as amended at 59 FR 14119, Mar. 25, 1994; 66 FR 10968, Feb. 21, 2001]

Title 47 published on 2013-10-01

no entries appear in the Federal Register after this date.

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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 24 after this date.

  • 2014-03-17; vol. 79 # 51 - Monday, March 17, 2014
    1. 79 FR 14634 - Expanding Access to Mobile Wireless Services Onboard Aircraft
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Proposed rule; extension of comment period.
      The reply comment period for the proposed rule published January 15, 2014 (79 FR 2615), is extended. Submit reply comments on or before May 16, 2014.
      47 CFR parts 22, 24, 27, 87 and 90