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Re: [TenTec] OT Antenna Tuners

To: <tentec@contesting.com>
Subject: Re: [TenTec] OT Antenna Tuners
From: Marinus Loewensteijn <zl2ml@hotmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 24 Jul 2008 03:56:34 +0800
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Thank you for correcting the misunderstandings and the information on the 
toroid material. 

73, Marinus, ZL2ML

 - when I did the replacement of all the byspass capacitors certain boards did 
not need to be modified. One of these was the RX mixer and the motto is what 
works one leaves well alone. 
> Date: Wed, 23 Jul 2008 08:14:02 -0700
> From: "Jim Brown K9YC" 
> Subject: Re: [TenTec] OT Antenna Tuners
> To: "tentec@contesting.com" 
> Message-ID: 
> Content-Type: text/plain; charset="us-ascii"
> 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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