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Re: [TenTec] Palstar tuner

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Palstar tuner
From: Steve Hunt <steve@karinya.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 21 May 2009 19:25:04 +0100
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
That's not true of all baluns. The flux in the ferrite core of a 1:1 
Guanella balun wound with coax depends on the common-mode current, not 
on the differential-mode current; so it's not directly related to the 
load Z.

Also, we shouldn't confuse heating with saturation. To quote W8JI: "We 
often assume heat means a core is very lossy or is "saturating", but 
*t*his often isn't true." " It is almost never core saturation, unless 
the core is subjected to very low average power and very high peak power 
levels."

Steve G3TXQ

Dr. Gerald N. Johnson wrote:
> That's the fundamental problem with tuning trough a balun. If the load Z
> is high the voltage goes high and saturates the core which leads to much
> loss and heating. 
>   

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