Re: [Amps] Tuned Input

[Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>]

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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