On Feb 7, 2005, at 4:48 PM, <sccook1@cox.net> wrote:
I recall seeing more dB than expected on may occasions. Rich may
recall one Saturday morning where the probigation between southwest
Arizona and Somis was significantly improved by the injection of
sufficient RF.
I remember this and it was one of the longest spans where the effect
was observed. However, there were plenty of times when there where no
free 3db.
cheerz, Steve
-SC
From: R.Measures <r@somis.org>
Date: 2005/02/07 Mon PM 12:19:58 EST
To: k7fm <k7fm@teleport.com>
CC: amps@contesting.com, Ian White G3SEK <g3sek@ifwtech.co.uk>
Subject: Re: [Amps] 10dB and propagation
On Feb 6, 2005, at 7:16 PM, k7fm wrote:
"I don't believe there is ANY transmitter on earth (amateur or pro)
that
could influence the ionosphere by causing a non-linear behavior in
that."
Stanford Research Institute found otherwise.
Looking at the situation in reverse, if an amateur transmitter (even
operating at illegal power) can cause a non-linear reflection, then
it
would
be probable that power used would be at the beginning of the
non-linear
range. If that was so, then higher power would be much more likely
to
trigger the non-linear reflection.
Since the effect was observed in the early morning, perhaps it has
more
to do with D-layer absorption, than F-layer reflection?
There are enough higher power stations
operating that the event would be reasonably common, and AT&T would
likely
have discovered it when they were using high power in the 30's for
overseas
telephone service. That such events have not been regularly reported
by
higher power raises a red flag.
In the 50's, CQ carried an article that proclaimed that reducing
power
would
trigger ionospheric amplification. It was in the April issue. That
sounds
like the same theory in reverse. Perhaps this present discussion can
be
submitted to CQ in time for the April, 2005 issue.
Colin K7FM
cheers, Colin
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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