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Re: [TenTec] OT Antenna Tuners

To: "tentec@contesting.com" <tentec@contesting.com>
Subject: Re: [TenTec] OT Antenna Tuners
From: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 23 Jul 2008 08:14:02 -0700
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On Tue, 22 Jul 2008 09:08:52 -0600, Dr. Gerald N. Johnson wrote:

>EXACTLY the definition of just a transformer.

Gerry's analysis is correct -- it's a TRANSFORMER. Depending on the 
core material (and to some extent, the winding details), it becomes 
increasingly lossy with increasing frequency. For Fair-Rite #61, 
losses begin increasing markedly above about 20 MHz. Fair-Rite has 
other materials for which this happens at a significantly higher 
frequency. #67 is one of them -- good for high power to at least 80 
MHz, but low frequency mu around 40 (as compared to 125 for #61). 

All of this data is in Fair-Rite's excellent online catalog as a 
pdf. http://www.fair-rite.com  

Jim K9YC

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