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From: dt@yenta.alb.nm.us (David B. Thomas)
Newsgroups: rec.radio.shortwave,rec.ham-radio,sci.electronics
Subject: Re: Ground Plane for my CB antenna
Message-ID: <1990Dec31.093359.17535@yenta.alb.nm.us>
Date: 31 Dec 90 09:33:59 GMT
References: <B12yu1w163w@ozonebbs.UUCP>
Organization: yenta unix pc, rio rancho, nm
Lines: 32

steven@ozonebbs.UUCP (Steven Rubin) writes:

>I am setting up a CB in my house, and I am having problems with a ground 
>plane.

I had very good luck with a quarter wave (104") mobile whip mounted on
the roof of my house (secured to a short mast), with three (four would have
been better still) quarter wave (104") ground radials (#14 wire or thicker)
sloping down at about 30 degrees below horizontal.

The radials should be electrically connected to the "ground" connection at the
base of the antenna, and the far ends should not be touching or near to
anything conductive.  I used nylon ropes to hold the radials in place, and
the radials/ropes became guys to support the structure as well!  #14 or
heavier wire is best for the radials.

The antenna performed nicely with an SWR of 1.1:1 on all 47 channels.
(40 if you prefer not to count varactor magic) :->

Another friend did something similar with a center-loaded whip.  The results
were acceptable, but not as good as I got with the long whip (not surprising).

Now, I was just imitating other working designs, without any really good
understanding of antenna theory, so there are undoubtedly things I could
have done better.  Please do post, so we can all learn.

[ Note: I left the crossposting since this seems to apply to all the
groups. ]

						little david
-- 
This is my .sig.  n?e  .sgurd no gis. ym si sihT