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[TowerTalk] Log periodics and Tri-Banders

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Subject: [TowerTalk] Log periodics and Tri-Banders
From: "David L. Thompson" <>
Date: Wed, 23 Jun 2004 13:53:12 -0400
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Oliver Swan did some work that forever changed the definition of what is a
log and what is a tri-bander.  The bulk of his work was on VHF but he
adapted it for KLM.  Several tri-banders outside of KLM/M2 use the log cell.
The ultimate log cell tri-bander is the KT34XA (or now the 36XA).
This antenna when introduced in 1970 was a real break through.

K6MYC at M2 is trying to figure out how to add 17 and 12 to the KT36XA I am
told.  You do run into the log problem of more elements for the same gain
once you start adding more bands to a basic tri-bander with a log cell.  The
TH11Dx is a good example of this.

73 Dave K4JRB


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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