Goto Section: 73.51 | 73.54 | Table of Contents
FCC 73.53
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 73.53 Requirements for authorization of antenna monitors.
(a) Antenna monitors shall be verified for compliance with the technical
requirements in this section. The procedure for verification is specified in
subpart J of part 2 of the FCC's rules.
(b) An antenna monitor shall meet the following specifications:
(1) The monitor shall be designed to operate in the 535-1705 kHz band.
(2) The monitor shall be capable of indicating any phase difference between
two RF voltages of the same frequency over a range of from 0 to 360°.
(3) The monitor shall be capable of indicating the relative amplitude of two
RF voltages.
(4) The device used to indicate phase differences shall indicate in degrees,
and shall be graduated in increments of 2°, or less. If a digital indicator
is provided, the smallest increment shall be 0.5°, or less.
(5) The device used to indicate relative amplitudes shall be graduated in
increments which are 1 percent, or less, of the full scale value. If a
digital indicator is provided, the smallest increment shall be 0.1 percent,
or less, of the full scale value.
(6) The monitor shall be equipped with means, if necessary, to resolve
ambiguities in indication.
(7) If the monitor is provided with more than one RF input terminal in
addition to a reference input terminal, appropriate switching shall be
provided in the monitor so that the signal at each of these RF inputs may be
selected separately for comparison with the reference input signal.
(8) Each RF input of the monitor shall provide a termination of such
characteristics that, when connected to a sampling line of an impedance
specified by the manufacturer the voltage reflection coefficient shall be 3
percent or less.
(9) The monitor, if intended for use by stations operating directional
antenna systems by remote control, shall be designed so that the switching
functions required by paragraph (b)(7) of this section may be performed from
a point external to the monitor, and phase and amplitude indications be
provided by external meters. The indications of external meters furnished by
the manufacturer shall meet the specifications for accuracy and
repeatability of the monitor itself, and the connection of these meters to
the monitor, or of other indicating instruments with electrical
characteristics meeting the specifications of the monitor manufacturer shall
not affect adversely the performance of the monitor in any respect.
(10) Complete and correct schematic diagrams and operating instructions
shall be retained by the party responsible for verification of the equipment
and submitted to the FCC upon request. For the purpose of equipment
authorization, these diagrams and instructions shall be considered as part
of the monitor.
(11) When an RF signal of an amplitude within a range specified by the
manufacturer is applied to the reference RF input terminal of the monitor,
and another RF signal of the same frequency and of equal or lower amplitude
is applied to any other selected RF input terminal, indications shall be
provided meeting the following specifications.
(i) The accuracy with which any difference in the phases of the applied
signals is indicated shall be ±1°, or better, for signal amplitude ratios of
from 2:1 to 1:1, and ±2°, or better, for signal amplitude ratios in excess
of 2:1 and up to 5:1.
(ii) The repeatability of indication of any difference in the phases of the
applied signals shall be ±1°, or better.
(iii) The accuracy with which the relative amplitudes of the applied signals
is indicated, over a range in which the ratio of these amplitudes is between
2:1 and 1:1, shall be ±2 percent of the amplitude ratio, or better, and for
amplitude ratios in excess of 2:1 and up to 5:1, ±5 percent of the ratio, or
better.
(iv) The repeatability of indication of the relative amplitudes of the
applied signals, over a range where the ratio of these amplitudes is between
5:1 and 1:1, shall be ±2 percent of the amplitude ratio, or better.
(v) The modulation of the RF signals by a sinusoidal wave of any frequency
between 100 and 10,000 Hz, at any amplitude up to 90 percent shall cause no
deviation in an indicated phase difference from its value, as determined
without modulation, greater than ±0.5°.
(12) The performance specifications set forth in paragraph (b)(11) of this
section, shall be met when the monitor is operated and tested under the
following conditions.
(i) After continuous operation for 1 hour, the monitor shall be calibrated
and adjusted in accordance with the manufacturer's instructions.
(ii) The monitor shall be subjected to variations in ambient temperature
between the limits of 10 and 40 °C; external meters furnished by the
manufacturer will be subjected to variations between 15 and 30 °C.
(iii) Powerline supply voltage shall be varied over a range of from 10
percent below to 10 percent above the rated supply voltage.
(iv) The amplitude of the reference signal shall be varied over the
operating range specified by the manufacturer, and in any case over a range
of maximum to minimum values of 3 to 1.
(v) The amplitude of the comparison signal shall be varied from a value
which is 0.2 of the amplitude of the reference signal to a value which is
equal in amplitude to the reference signal.
(vi) Accuracy shall be determined for the most adverse combination of
conditions set forth above.
(vii) Repeatability shall be determined as that which may be achieved under
the specified test conditions over a period of 7 days, during which no
calibration or adjustment of the instrument, subsequent to the initial
calibration, shall be made.
(viii) The effects of modulation of the RF signal shall be separately
determined, and shall not be included in establishing values for accuracy
and repeatability.
Note: In paragraph (b)(1) of this section, the requirement that monitors be
capable of operation in the 535-1705 kHz band shall apply only to equipment
manufactured after July 1, 1992. Use of a monitor in the 1605-1705 kHz band
which is not approved for such operation will be permitted pending the
general availability of 535-1705 kHz band monitors if a manufacturer can
demonstrate, in the interim, that its monitor performs in accordance with
the standards in this section on these 10 channels.
(Secs. 4, 5, 303, 48 Stat., as amended, 1066, 1068, 1082 (47 U.S.C. 154,
155, 303))
[ 38 FR 1917 , Jan. 19, 1973, as amended at 49 FR 3999 , Feb. 1, 1984; 49 FR 29069 , July 18, 1984; 50 FR 32416 , Aug. 12, 1985; 50 FR 47054 , Nov. 14,
1985; 51 FR 2707 , Jan. 21, 1986; 56 FR 64859 , Dec. 12, 1991; 57 FR 43290 ,
Sept. 18, 1992; 60 FR 55480 , Nov. 1, 1995; 63 FR 36604 , July 7, 1998; 66 FR 20755 , Apr. 25, 2001]
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Goto Section: 73.51 | 73.54
Goto Year: 2014 |
2016
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