[TenTec] Built in SWR meter bannans

[Rick - DJ0IP / NJ0IP]

Steve, Sevick is right.  You "can" wind a 4:1 Guanella balun on a single
core.  I guess the question is, how well does it work?
I have tried it both ways.  In fact I was using dual core's for a couple of
years until I read that there is very poor tolerance in the cores... up to
20 % variance. Since I have no way to measure this and don't know where to
buy matched pairs, I begin to wonder how do I maintain symmetry when there
is 20% variance.  So I can't decide whether it's better to use 1x FT-240 or
2x FT-140.  Any ideas on this?

73
Rick, DJ0IP

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Steve Hunt
Sent: Wednesday, April 24, 2013 9:54 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Built in SWR meter bannans

Certainly Sevick's books are some of the very few available on the topic,
but I'm not sure I would call them "definitive works". I know that may
appear to be heresy, but I've now "invested" in 3 of Sevick's books, and I
have to say I'm less than impressed with some aspects.

For example:

* Pretty well all of his measurements relate to the differential-mode
performance of baluns - I can't find any significant measurements on their
CM performance
* His understanding of what drives CM current at a coax-fed dipole's
feedpoint is flawed
* He seems to think you can wind a 4:1 Guanella balun on a single core

73,
Steve G3TXQ



On 24/04/2013 20:00, Stuart Rohre wrote:
> The definitive work on baluns are Jerry Sevick's (sk) books.  See 
> "Baluns and Ununs".  He has many experimental examples, specifications 
> and results.
>
> -Stuart Rohre
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> TenTec at contesting.com
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>

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