On 9/25/2022 1:43 PM, Bill Mader wrote:
Putting the results in a spreadsheet quickly makes antenna configurations'
difference apparent. I have done something similar using the RBN, two
antennas, and two nearby frequencies on the same band. This method
effectively identified which antenna was preferred in different directions
and distances. Even so, the differences could change briefly at any time
so being able to switch antennas instantly was extremely helpful.
I've done that for two 160M antennas, one of which had a couple of dB of
directivity. I used my call on one, a club call on the other.
Transmitted TEST K9YC on CW 5-6 times for each call, paused 5 min, QSYed
both a bit, repeated 10-12 times. Did this 6-8 nights, had spreadsheet
rows for each station that heard me, separate row for each antenna. The
test provided excellent data.
W6GJB did something quite similar comparing a top and bottom loaded
vertical we'd built for CQP/7QP expeditions with an inverted V on 80M.
It also yielded good data. It's shown on a few slides in this talk we
did at the Pacificon antenna forum. We've since abandoned the concept
after later trying a half dozen or so iterations of the design because
it's not mechanically practical for the intended portable use.
http://k9yc.com/80M-FDVertical.pdf
73, Jim K9YC
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