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Topband: 160 meter current-fed T antenna, where did I go wrong?

To: <topband@contesting.com>
Subject: Topband: 160 meter current-fed T antenna, where did I go wrong?
From: "Mark Lunday" <mlunday@nc.rr.com>
Date: Sat, 6 Nov 2010 21:43:57 -0400
List-post: <topband@contesting.com">mailto:topband@contesting.com>
ON4UN?s book, 3rd edition, Chapter 9, page 9-46.  Pretty simple concept?the
vertical portion is ¼ wavelength, and the total horizontal length is ½
wavelength.

Higher radiation resistance, not nearly as dependent upon ground.  Looks
like I can get by without the radial wires and just use a good ground rod.
Can?t do anything about the soil in the near field, anyway.

So I put it together, with remote tuner at the base (LDG Z-11).  

The tuner cannot find a match, which is probably due to the RF.  It?s using
the coax as a ground path, looks like.  I can see RF getting into the coax
even with a commercial choke before the tuner (shows up coming back into the
shack on the remote antenna switch control lights).  

Did I design the antenna wrong.  Even though the wire is insulated, the
horizontal section goes through 2 trees.  ?  The ends are not free and clear
of the trees.  

Am I wrong about the radials?  What am I missing?

Also, I read NZ4O?s article: http://www.wcflunatall.com/nz4o9.htm  which
seems to validate my approach.

Suggestions/ideas appreciated.  Thanks

Mark Lunday
WD4ELG




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