I`m sure nearly if not all competant builders figured this out long
ago...73..Jim..K7RDX..
----- Original Message -----
From: "Wayne Rogers" <n1wr@chesapeake.net>
To: <Amps@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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> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
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