FCC 73.154 Revised as of December 4, 2012
Goto Year:2011 |
§ 73.154 AM directional antenna partial proof of performance measurements.
(a) A partial proof of performance consists of at least 8 field
strength measurements made on each of the radials that includes a
monitoring point. If the directional pattern has fewer than 4 monitored
radials, the partial proof shall include measurements on those radials
from the latest complete proof of performance which are adjacent to the
(b) The measurements are to be made within 3 to 15 kilometers from the
center of the antenna array. When a monitoring point as designated on
the station authorization lies on a particular radial, one of the
measurements must be made at that point. One of the following methods
shall be used for the partial proof:
(1) Measurement points shall be selected from the points measured in
latest full proof of performance provided that the points can be
identified with reasonable certainty, and that land development or
other factors have not significantly altered propagation
characteristics since the last full proof. At each point, the licensee
shall measure directional field strength for comparison to either the
directional or the nondirectional field strength measured at that point
in the last full proof.
(2) In the event that a meaningful comparison to full proof
measurements cannot be made, the licensee shall measure both
directional and nondirectional field strength at eight points on each
radial. The points need not be limited to those measured in the last
full proof of performance.
(c) The results of the measurements are to be analyzed as follows.
Either the arithmetic average or the logarithmic average of the ratios
of the field strength at each measurement point to the corresponding
field strength in the most recent complete proof of performance shall
be used to establish the inverse distance fields. (The logarithmic
average for each radial is the antilogarithm of the mean of the
logarithms of the ratios of field strength (new to old) for each
measurement location along a given radial). When new nondirectional
measurements are used as the reference, as described in paragraph
(b)(2) of this section, either the arithmetic or logarithmic averages
of directional to nondirectional field strength on each radial shall be
used in conjunction with the measured nondirectional field from the
last proof to establish the inverse distance field.
(d) The result of the most recent partial proof of performance
measurements and analysis is to be retained in the station records
available to the FCC upon request. Maps showing new measurement points,
i.e. , points not measured in the last full proof, shall be associated
with the partial proof in the station's records, and shall be provided
to the FCC upon request.
[ 66 FR 20756 , Apr. 25, 2001]
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