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
the
>>>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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