The limitation of this approach is that any Yagi has its intended
directivity only within a few percent of its design frequency. Away from
that frequency its directivity is best described as "undefined." So
while I agree that rotating the antenna may CHANGE the pickup from the
FM station, don't expect it to change much, or in any predictable manner. :)
73, Jim K9YC
Fri,7/29/2016 9:14 AM, Jeff DePolo wrote:
Assuming the yagi is mounted in the clear and can be rotated, first point it
at the FM station and make a measurement, and then rotate it 90 degrees
(broadside) and take another measurement. If the apparent match/VSWR
changes as the orientation is varied, that would be a good indication that
the test instrument is being overloaded or otherwise adversely affected by
the high-level off-channel RF.
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