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Re: [TenTec] Built in SWR meter bannans

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Built in SWR meter bannans
From: "Charles P. Steinmetz" <charles_steinmetz@lavabit.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 23 Apr 2013 20:22:59 -0400
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Rick wrote:

I had so much trouble burning up baluns back in the 80s that I have switched to using only Teflon insulated wire for my chokes and baluns.
Baluns don't normally burn up because the insulation isn't 
adequate.  Rather, they burn up because the common-mode current is 
higher than the core size and mix can tolerate (or, much less 
frequently, because the wire used is too small).  Overheating is a 
symptom of too small a core, the wrong ferrite mix for the 
frequency(ies), too few turns, and/or too small a wire gauge.  There 
is lots of information on the web.  When in doubt, use a bigger core 
(after making sure you are using the right ferrite mix for the 
frequency, sufficiently heavy wire to handle the power, and enough 
turns to get the common-mode impedance that you need).
Best regards,

Charles






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