Goto Section: 73.53 | 73.57 | Table of Contents
FCC 73.54
Revised as of October 1, 2006
Goto Year:2005 |
2007
Sec. 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 Sec. 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 Sec. 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]
Goto Section: 73.53 | 73.57
Goto Year: 2005 |
2007
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