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[TenTec] Re: Request for comments about 238 tuner

To: <tentec@contesting.com>
Subject: [TenTec] Re: Request for comments about 238 tuner
From: aa4lr@radio.org (Bill Coleman AA4LR)
Date: Tue, 23 Sep 97 08:13:32 -0400
On 9/22/97 7:18 PM, AE0Q  V31RY at v31ry@ix.netcom.com wrote:

>>>> I believe that most MFJ tuners use the T network and TenTec uses a
>>>> swtichable L network. L networks are know for their low loss while the
>>>> losses in T networks can be quite high.
>>>We're getting into an area I don't know about- I thought the MFJ used
>>>the same circuit the ARRL handbooks show as the SPC transmatch, known as 
>>>PI network? Go ahead, I'm learning!
>>No, it uses a T network. This is a very common circuit. (I think the SPC 
>>uses the same) 
>  Bill, the Ultimate Transmatch circuit (which is what a Murch UT-2000 is)
>and the SPC are not T-match circuits.  They have an extra capacitor section
>going to ground, the UT/Murch has it at the input, the SPC has it across the
>inductor.  But they aren't T circuits like most MFJ tuners.

Mea cupla -- you're correct.

T-match and Ultimate match (and I assume the SPC) circuits do tune in a 
similar fashion.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@radio.org
Quote: "Not in a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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