Goto Section: 73.154 | 73.157 | Table of Contents
FCC 73.155
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 73.155 Periodic directional antenna performance recertification.
A station licensed with a directional antenna pattern pursuant to a
proof of performance using moment method modeling and internal array
parameters as described in § 73.151(c) shall recertify the performance
of that directional antenna pattern at least once within every 24 month
period.
(a) Measurements shall be made to verify the continuing integrity of
the antenna monitor sampling system.
(1) For towers using base current or base voltage sampling derived at
the output of the antenna coupling and matching equipment, the sampling
devices shall be disconnected and calibrated by measuring their outputs
with a common reference signal (a current through them or a voltage
across them, as appropriate) and the calibration must agree with the
manufacturer's specifications.
(2) For towers using base current or base voltage sampling derived at
the output of the antenna coupling and matching equipment, sampling
line measurements shall be made to verify the open-circuit resonant
frequency closest to carrier frequency, to establish length, and also
at frequencies corresponding to odd multiples of1/8wavelength
immediately above and below the open-circuit resonant frequency closest
to carrier frequency, while open circuited, to verify their
characteristic impedance. The frequencies measured must be the same as
were measured in the most recent proof of performance and must
demonstrate that the sampling lines continue to meet the requirements
of § 73.151(c) with regard to their length and characteristic
impedance.
(3) For towers having sampling loops, measurements shall be made at
carrier frequency or, if necessary, at nearby frequencies where the
magnitude of the measured impedance is no greater than 200 ohms with
the sampling loops connected. The frequencies measured must be the same
as were measured in the most recent proof of performance and the
measured impedances must agree within +-2 ohms and +-4 percent
resistance and reactance of the proof values.
(b) Field strength measurements shall be made at the reference field
strength measurement locations that were established by the most recent
proof of performance. If locations have become inaccessible or their
readings contaminated by localized electromagnetic environmental
changes, new locations that meet the requirements of the moment method
proof of performance rules in § 73.151(c)(3) shall be established to
replace them.
(c) The results of the periodic directional antenna performance
recertification measurements shall be retained in the station's public
inspection file.
[ 73 FR 64562 , Oct. 30, 2008]
Goto Section: 73.154 | 73.157
Goto Year: 2010 |
2012
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