Or a Delta Electronics "Operating Impedance Bridge"...which I have one
of...maybe I'll do that this weekend on my 3-1000Z amp.
>
> From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
> Date: 2006/01/20 Fri AM 11:06:43 EST
> To: Roger D Johnson <n1rj@adelphia.net>,
> Tony King - W4ZT <amps080605@w4zt.com>
> CC: AMPS <amps@contesting.com>
> Subject: Re: [Amps] Tuned Input
>
> Has anyone ever come up with an equation for the input impedance of a GG
> stage in Class AB2?
> I guess the problem is that it's a variable with drive level - at very low
> level, where the stage is Class A, it's the classical 1/gm, but it should be
> possible to simulate at higher power levels if someone has time (and the
> interest) to produce a suitable model.
>
> It would answer a lot of questions posed here. Similalry, has anyone ever
> measured the input impedance at various power levels? The best way would be a
> dual directional coupler and notwork analyser or vector voltmeter.
> 73
> Peter G3RZP
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>
Scott Townley NX7U
Gilbert, AZ DM43di
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