Jack,
The question of the "best way" is not easy to answer as each has trade offs.
The best MATCH can be made with a gamma match, but adds extra complexity, and
mechanical problems as a result of how to support the matching system. The
extra contact with the element wire can also create another potential stress
point. Matching cables (odd quarterwave 75ohm cable) is very simple, usually
very effective and usually only needed on 10.12 and 15m if constant spacing
for each band is used. So it depends on the "compromise" you are willing to
live with - perfect match, maybe more cost and maintainace, or good enough
match
and very stable cable system of matching.
Hygain had a tri-band quad with separate gamma matches and a single common
feed. Lots of interaction getting it tuned, but simplified the feed to just
one
coax, and no need for a remote antenna switch.
Regards,
Norm W4QN
=====================================================
Date: Wed, 16 Jan 2008 03:17:06 -0500
From: " KZ4USA" <videorov@verizon.net>
Subject: [TowerTalk] Quad antenna matching which is best gamma match
or using coax matching sections for bands that need it.
To: <towertalk@contesting.com>
Message-ID: <000601c85818$2ed6af20$0201a8c0@internet>
Content-Type: text/plain; charset="iso-8859-1"
Trying to decide which way is the best way to go with my large 6el Quad
design.
Jack
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