[Amps] Which LDG Autotuner for Amp Input?

[Carl]

With a wavelength on 10M being around 33' I dont think that is an issue even 
with .66VF coax.

However an electrical quarter or half wave of cable can give some 
interesting results. Many older amps required special length coax to the 
exciter.

Carl
KM1H



----- Original Message ----- 
From: "jeff millar" <jeff at wa1hco.net>
To: <amps at contesting.com>
Sent: Sunday, October 10, 2010 3:35 PM
Subject: Re: [Amps] Which LDG Autotuner for Amp Input?


> On 10/10/2010 12:42 PM, Gary Schafer wrote:
>> Look at the WD7S tuned input board.
>> http://home.earthlink.net/~wd7s/TU-6B.htm
>>
>> An external tuner is not the best way to go as the output capacitor of 
>> the
>> pi net needs to be very close to the cathode of the tube.
>>
> That's probably true in the sense that the the line from cathode to
> tuner should be much shorter than a wavelength at the operating
> frequency...or else the capacitor starts to look like an inductor.  So
> how about putting enough capacitance close to the tube cathode to cover
> say 10 through 20 meters and then use a relatively short line to connect
> to the tuner?
>
> jeff, wa1hco
>
>> The WD7S board solves all problems.
>>
>> 73
>> Gary  K4FM
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