Hi John,
If you are going to run that wire down to a ground rod, you might try
using coax instead. Attach the center conductor Only at the rig end, and
connect Both the shield And the center conductor at the ground rod end.
Another variation is to connect the center conductor Only at both the
rig and ground rod ends, and then use a .1 or .01 mfd. capacitor to
connect between the shield and the Center conductor at the ground rod
end, or both ends.
When I had my ham shack on the second floor, this configuration worked
for me.
Good Luck, and please let us know of your progress!
73,
Mike
NM7X
------------------------------
Message: 3
Date: Sun, 15 Oct 2006 12:49:10 -0400
From: "John K Gotwals" <john@gotwals.com>
Subject: [TenTec] Orion and RF Feedback
To: <tentec@contesting.com>
Ray, many thanks for your comments. I have already found that touching the
mike makes a difference, although that may just be the symptom of a more
serious grounding problem at this end. Radioworks
http://radioworks.com/nbgnd.html has an illuminating discussion of ground
problems, and my next step is to drill another hole through the window sill
and run a wire down a story and a half to a ground rod. In addition I will
try a counterpoise consisting of a 1/4 wavelength (at 40 meters) piece of
hookup wire strung down the hall to determine its affect on my problem.
W2DU
choke filters between the Matchbox and amplifier and between the amplifier
and Orion appear to have helped lessen the problem.
John, N9JG
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