[Amps] Tuned Input

[Scott Townley]

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 at g3rzp.wanadoo.co.uk>
> Date: 2006/01/20 Fri AM 11:06:43 EST
> To: Roger D Johnson <n1rj at adelphia.net>, 
>         Tony King - W4ZT <amps080605 at w4zt.com>
> CC: AMPS <amps at 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