[UK-CONTEST] GROUND SYSTEM ADVICE PLEASE !

[john lemay]

Don

Don't apologise for the bandwidth, I found the question, and the answers
most interesting.

John G4ZTR

----- Original Message -----
From: "Don Beattie" <g3ozf at btinternet.com>
To: "Uk-Contest at Contesting.Com" <uk-contest at contesting.com>
Sent: Friday, November 07, 2003 5:12 PM
Subject: [UK-CONTEST] GROUND SYSTEM ADVICE PLEASE !


A strenge request for the Contest Reflector, but I have a problem.

I'm re-engineering the Butternut HF6-V here, which I use as a spare antenna
for the occasions in contests when the beams are 180 degrees out from the
direction you want, and you can get a quick result with a call on the HF6.
I've been relocating it a little, and took the opportunity to put down a
better set of radials (40x10m radials lying on the ground)

It works great on 30-10, but on 40 and 80 the minimum VSWR is about 2:1 (and
yes, the coils are resonated properly). When I checked it with the analyser,
I found that I could get 1:1 VSWR with just a ground rod earth, but as soon
as I added more than a few radials, up went the vswr. Now I've been putting
about 100 radials around the big 87ft vertical (and it's far enough away not
to be coupling to the HF6) and the more I've added, the better it's got.
With the HF6, the reverse seems to be happening.

Has anyone else with an HF6/HF9 noticed this effect or can offer any words
of wisdom ?

Don
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