[TenTec] OT Antenna Tuners

[Marinus Loewensteijn]

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 at 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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