47 CFR 73.54 - Antenna resistance and reactance measurements.

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§ 73.54 Antenna resistance and reactance measurements.
(a) The resistance of an omnidirectional series fed antenna is measured at either the base of the antenna without intervening coupling or tuning networks, or at the point the transmission line connects to the output terminals of the transmitter. The resistance of a shunt excited antenna may be measured at the point the radio frequency energy is transferred to the feed wire circuit or at the output terminals of the transmitter.
(b) The resistance and reactance of a directional antenna shall be measured at the point of common radiofrequency input to the directional antenna system after the antenna has been finally adjusted for the required radiation pattern.
(c) A letter of notification must be filed with the FCC in Washington, DC, Attention: Audio Division, Media Bureau, when determining power by the direct method pursuant to § 73.51. The letter must specify the antenna or common point resistance at the operating frequency. The following information must also be kept on file at the station:
(1) A full description of the method used to make measurements.
(2) A schematic diagram showing clearly all components of coupling circuits, the point of resistance measurement, the location of the antenna ammeter, connections to and characteristics of all tower lighting isolation circuits, static drains, and any other fixtures connected to and supported by the antenna, including other antennas and associated networks. Any network or circuit component used to dissipate radio frequency power shall be specifically identified, and the impedances of all components which control the level of power dissipation, and the effective input resistance of the network must be indicated.
(d) AM stations using direct reading power meters in accordance with § 73.51, can either submit the information required by paragraph (c) of this section or submit a statement indicating that such a meter is being used. Subsequent station licenses will indicate the use of a direct reading power meter in lieu of the antenna resistance value in such a situation.
[66 FR 20755, Apr. 25, 2001,as amended at 67 FR 13231, Mar. 21, 2002]

Title 47 published on 2014-10-01.

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  • 2015-05-29; vol. 80 # 103 - Friday, May 29, 2015
    1. 80 FR 30630 - Television Broadcasting Services; Providence, Rhode Island
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      Final rule.
      This rule is effective May 29, 2015.
      47 CFR Part 73

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United States Code

Title 47 published on 2014-10-01

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

  • 2015-07-14; vol. 80 # 134 - Tuesday, July 14, 2015
    1. 80 FR 40957 - Expanding the Economic and Innovation Opportunities of Spectrum Through Incentive Auctions; Channel Sharing by Full Power and Class A Stations Outside the Broadcast Television Spectrum Incentive Auction Context
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      Proposed rule.
      Comments may be filed on or before August 13, 2015, and reply comments may be filed August 28, 2015. Written comments on the proposed information collection requirements, subject to the Paperwork Reduction Act (PRA) of 1995, Public Law 104-13, should be submitted on or before September 14, 2015.
      47 CFR Part 73