Goto Section: 73.54 | 73.58 | Table of Contents
FCC 73.57
Revised as of October 1, 2010
Goto Year:2009 |
2011
§ 73.57 Remote reading antenna and common point ammeters.
Remote reading antenna and common point ammeters may be used without
further authority according to the following conditions:
(a) Remote reading antenna or common point ammeters may be provided by:
(1) Inserting second radio frequency current sensing device directly in
the antenna circuit with remote leads to the indicating instruments.
(2) Inductive coupling to radio frequency current sensing device for
providing direct current to indicating instrument.
(3) Capacity coupling to radio frequency current sensing device for
providing direct current to indicating instrument.
(4) Current transformer connected to radio frequency current sensing
device for providing direct current to indicating instrument.
(5) Using transmission line current meter at transmitter as remote
reading ammeter. See paragraph (c) of this section.
(6) Using the indications of the antenna (phase) monitor, provided that
when the monitor is used to obtain remote reading indication of
non-directional antenna base current, the monitor calibration can be
independently made and maintained for each mode of operation.
(b) Devices used for obtaining remote reading antenna or common point
current indications, except antenna monitor coupling elements, shall be
located at the same point as, but below (transmitter side) the
associated main ammeter.
(c) In the case of shunt-excited antennas, the transmission line
current meter at the transmitter may be considered as the remote
antenna ammeter provided the transmission line is terminated directly
into the excitation circuit feed line, which shall employ series tuning
only (no shunt circuits of any type shall be employed) and insofar as
practicable, the type and scale of the transmission line meter should
be the same as those of the excitation circuit feed line meter (meter
in slant wire feed line or equivalent).
(d) Each remote reading ammeter shall be accurate to within 2 percent
of the value read on its corresponding regular ammeter.
(e) All remote reading ammeters shall conform with the specifications
for regular antenna ammeters.
(f) Meters with arbitrary scale divisions may be used provided that
calibration charts or curves are provided at the transmitter control
point showing the relationship between the arbitrary scales and the
reading of the main meters.
(g) If a malfunction affects the remote reading indicators of the
antenna or common point ammeter, the operating power may be determined
by a method using alternative procedures as described in § 73.51.
[ 41 FR 36817 , Sept. 1, 1976, as amended at 48 FR 38477 , Aug. 24, 1983;
49 FR 49850 , Dec. 24, 1984; 50 FR 32416 , Aug. 12, 1985; 60 FR 55480 ,
Nov. 1, 1995]
Goto Section: 73.54 | 73.58
Goto Year: 2009 |
2011
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