On 8/22/2019 11:55 AM, john@kk9a.com wrote:
Many years ago, Clarke Greene, K1JX, casually mentioned that he had
determined adding 1dB to your signal strength would result in a 6% increase
in your contest score (mostly applied to DX contests). I filed that away
for future reference.
The origin of this may be N6ZFO, who published an equivalent number for
the difference between LP and HP in SS. Bill worked as a statistician,
and his number came from statistical analysis of SS scores. I don't know
when he first published it, but I saw if for the first time after moving
to CA and joining NCCC in 2006 -- it was part of our strategy piece for
SS. Doing the math, I think I remember that Bill's number translated to
6% for one dB, and I published that in an applications note about
antennas, probably about 8-10 years ago.
There are several antenna applications notes on my website that NCJ
wanted to publish, but ARRL decided that there were too many graphics,
and deleting them would have destroyed the paper. One answers the
question, "If could put my HF vertical on my roof, should I" (the answer
is yes). Another studies the effect of height on horizontally polarized
antennas, and produces a graph of gain vs height for 40M and 80M. It
also destroys the myth that antennas have to be low for NVIS. Rather, I
prove that low antennas are WORSE for NVIS. And it shows that, in
general, vertically polarized antennas are strongly affected by ground
quality, while the only effect of ground quality on horizontally
polarized antennas is to influence their feedpoint impedance.
The website is k9yc.com/publish.htm
73, Jim K9YC
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