47 CFR 73.509 - Prohibited overlap.

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§ 73.509 Prohibited overlap.
(a) An application for a new or modified NCE-FM station other than a Class D (secondary) station will not be accepted if the proposed operation would involve overlap of signal strength contours with any other station licensed by the Commission and operating in the reserved band (Channels 200-220, inclusive) as set forth below:
Frequency separation Contour of proposed station Contour of other station
Co-channel 0.1mV/m (40 dBu)1 mV/m (60 dBu) 1 mV/m (60 dBu)0.1 mV/m (40 dBu)
200 kHz 0.5 mV/m (54 dBu)1 mV/m (60 dBu)1 1 mV/m (60 dBu)0.5 mV/m (54 dBu)
400 kHz/600 kHz 100 mV/m (100 dBu)1 mV/m (60 dBu) 1 mV/m (60 dBu)100 mV/m (100 dBu)
(b) An application by a Class D (secondary) station, other than an application to change class, will not be accepted if the proposed operation would involve overlap of signal strength contours with any other station as set forth below:
Frequency separation Contour of proposed station Contour of any other station
Co-channel 0.1 mV/m (40 dBu) 1 mV/m (60 dBu).
200 kHz 0.5 mV/m (54 dBu) 1 mV/m (60 dBu).
400 kHz 10 mV/m (80 dBu) 1 mV/m (60 dBu).
600 kHz 100 mV/m (100 dBu) 1 mV/m (60 dBu).
(c) The following standards must be used to compute the distances to the pertinent contours:
(1) The distance of the 60 dBu (1 mV/m) contours are to be computed using Figure 1 of § 73.333 [F(50,50) curves] of this part.
(2) The distance to the other contours are to be computed using Figure 1a of § 73.333 [F(50,10) curves]. In the event that the distance to the contour is below 16 kilometers (approximately 10 miles), and therefore not covered by Figure 1a, curves in Figure 1 must be used.
(3) The effective radiated power (ERP) that is the maximum ERP for any elevation plane on any bearing will be used.
(d) An application for a change (other than a change in channel) in the facilities of a NCE-FM broadcast station will be accepted even though overlap of signal strength contours, as specified in paragraphs (a) and (b) of this section, would occur with another station in an area where such overlap does not already exists, if:
(1) The total area of overlap with that station would not be increased;
(2) The area of overlap with any other station would not increase;
(3) The area of overlap does not move significantly closer to the station receiving the overlap; and,
(4) No area of overlap would be created with any station with which the overlap does not now exist.
(e) The provisions of this section concerning prohibited overlap will not apply where the area of such overlap lies entirely over water.
[50 FR 27962, July 9, 1985, as amended at 52 FR 43765, Nov. 16, 1987; 65 FR 79778, Dec. 20, 2000]

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.

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  • 2014-12-23; vol. 79 # 246 - Tuesday, December 23, 2014
    1. 79 FR 76902 - Expanding the Economic and Innovation Opportunities of Spectrum Through Incentive Auctions
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Correcting amendments.
      Effective November 6, 2014.
      47 CFR Parts 0, 1, 2, 15, 27, 73, and 74

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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.

  • 2014-12-23; vol. 79 # 246 - Tuesday, December 23, 2014
    1. 79 FR 76902 - Expanding the Economic and Innovation Opportunities of Spectrum Through Incentive Auctions
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Correcting amendments.
      Effective November 6, 2014.
      47 CFR Parts 0, 1, 2, 15, 27, 73, and 74