[Amps] Autotuners in Amps

[k7rdx]

I`m sure nearly if not all competant builders figured this out long 
ago...73..Jim..K7RDX..
----- Original Message ----- 
From: "Wayne Rogers" <n1wr at chesapeake.net>
To: <Amps at contesting.com>
Sent: Thursday, February 12, 2009 8:33 AM
Subject: Re: [Amps] Autotuners in Amps


> I've been watching the mail on this and I'm surprised that no-one has 
> stated the fact that the input impedance of these amplifiers is not 
> constant.  Does anyone really believe that the input impedance of a 
> 4-1000A is 105 ohms (always, invariant)?  It probably varies +/- 20 ohms 
> or so dependent on frequency, drive level, etc.  This is why we use low Q 
> and a circuit that translates 50 ohms to what is the anticipated average 
> value of the input impedance.
>
> 'nuff said.
> Wayne  N1WR
>
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