Hi Gary,
Probably the easiest explanation is to call it a "shielded ground wire". The
coax inner conductor is the actual ground wire, and the shield keeps it from
radiating.
My 2nd floor installation was a nightmare, given that I was also very close to
the antenna center, which was about 10 feet above the roof of my house. This
was one technique I used to beat the "RF in the Audio" problem. I also used
toroids and bypass capacitors in generous quantities.
OF course, each RFI condition is unique in some way...YMMV.
73,
Mike
NM7X
------------------------------
Message: 2
Date: Mon, 16 Oct 2006 11:51:21 -0400
From: "Gary Hoffman" <ghoffman@spacetech.com>
Subject: Re: [TenTec] TenTec Digest, Vol 46, Issue 45
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Message-ID: <00f401c6f13a$f04ca5b0$9ee7254a@aa2iz>
Content-Type: text/plain; charset="iso-8859-1"
Mike,
I'm curious. What is the theory behind this approach ? I'm always
interested to learn more approaches to grounding.
Gary
----- Original Message -----
From: "Mike Gorniak" <mgorniak@genesiswireless.us>
To: <tentec@contesting.com>
Sent: Monday, October 16, 2006 11:39 AM
Subject: Re: [TenTec] TenTec Digest, Vol 46, Issue 45
> > 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
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