Goto Section: 73.54 | 73.58 | Table of Contents
FCC 73.57
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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]
return arrow Back to Top
Goto Section: 73.54 | 73.58
Goto Year: 2014 |
2016
CiteFind - See documents on FCC website that
cite this rule
Want to support this service?
Thanks!
Report errors in
this rule. Since these rules are converted to HTML by machine, it's possible errors have been made. Please
help us improve these rules by clicking the Report FCC Rule Errors link to report an error.
hallikainen.com
Helping make public information public