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[Antennaware] Topband vertical matching.

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Subject: [Antennaware] Topband vertical matching.
From: "Hal Kennedy" <>
Date: Tue, 17 Aug 2010 13:26:40 -0400
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I'm with Gary on this one - and ON4UN.  Making inverted L and better yet
T-top loaded verticals too long will raise the maximum current off the
ground and reduce the current in the ground system - both good things.
My T-vertical here is resonant at 1.2 MHz and tuned out with an L
network that can be calculated with TLW software with just a few minutes

The "too long" antenna can be built as Gary mentions with a simple
series capacitance, or for a better match an L network.  Mine components
are exposed to the weather - I see no reason to lower their Q by putting
them in a box.  They have been outdoors for five years and run at 1.5 KW
in the rain just fine.

Per Jay's article, a high pass arrangement is nice if you have severe
BCB interference - otherwise I would head the other way, to a longer
antenna.  Also, there are other ways to deal with BCB interference than
making the antenna otherwise too short.

Best 73
Hal N4GG

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