Which is the main purpose to design an RF class A stage at high power
levels?, if with AB1 one can accomplish the required (and even more) the
unwanted signals attenuation with better efficiency. Any special mode of
transmission?, or in those situations where there are several transmitters
operating at the same location?. Some audio fanatic like mania?.
TIA
Best regards
Guillermo - LU8EYW.
TexasRF@aol.com escribió:
>
> Doesn't grounded grid/cathode driven operation provide much if not all of
> the degeneration/negative feedback we are discussing here?
>
> 73,
> K5GW
>
>
>
>
> In a message dated 12/14/2005 11:10:17 P.M. Central Standard Time,
> K1JJ@comcast.net writes:
>
> Correction:
>
> It was pointed out to me that the cathode resistor for negative feedback is
> to be used only for a grid driven [grounded cathode] amplifier to generate
> degenerative [negative] feedback.
>
> In a cathode driven [GG] amplifier, the cathode is in phase with the plate
> and it will not work. A different method must be used for neg feedback.
>
> This is why my GG triode did not show any diffence in drive when I tried
> the cathode resistor.
>
> I saw the idea in the archives and must have missed the fact that they were
> talking about grid driven amps at the time.
>
> 73,
> Tom, K1JJ
>
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