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Re: [Amps] Autotuners in Amps

To: <Amps@contesting.com>
Subject: Re: [Amps] Autotuners in Amps
From: "Wayne Rogers" <n1wr@chesapeake.net>
Date: Thu, 12 Feb 2009 11:33:01 -0500
List-post: <amps@contesting.com">mailto:amps@contesting.com>
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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