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Re: [TowerTalk] Wireman Balun kits

Subject: Re: [TowerTalk] Wireman Balun kits
From: Tom McDermott <>
Date: Thu, 6 Mar 2008 07:36:20 -0800 (PST)
List-post: <">>
There are several possible failure modes for baluns. Besides those involving 
the magnetic core material, high SWR can lead to excessive voltage between the 
windings. Tom, W8JI has written about that in the past. Several suppliers will 
sell you teflon tubing that you can use to sleeve the formvar wire in the balun 
to significantly increase the breakdown voltage.
  (One advises to select teflon tubing one size larger than your wire because 
it's otherwise hard to pull in over the wire). I don't have the links 
immediately available, but will try to find them and post.
  Additionally, balun loss is affected by mismatch. Jerry Sevick has written a 
lot about matching the winding impedance to the operating impedance, and the 
significant impact that it can have on the loss of the balun. Sleeving the 
wires with teflon will change the impedance because the two wires are slightly 
farther apart and thus the impedance increases.
    -- Tom, N5EG

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