Gerald, I just looked at Radiotron Designers HB 4th Ed (1953) and it clearly
states that the GG signal path is in phase. I dont remember where I learned
this but that means it must have been ancient history! Probably one of the
Sr Engineers at National who were tutoring a young ET right out of the Navy.
Carl
KM1H
----- Original Message -----
From: <TexasRF@aol.com>
To: <herzog@frontiernet.net>; <amps@contesting.com>
Sent: Sunday, March 28, 2010 8:51 PM
Subject: Re: [Amps] gg
> Herzog, Bill and all,
>
> It is a good thing that the input power and output power are in phase else
> the input power would subtract from the output power instead of adding.
>
> I was reading in my Orr's Handbook today and couldn't find anything about
> input and output being out of phase in any type amplifier.
>
> What he did write was that the instantaneous peak positive grid voltage
> coincides with the peak plate current and that the instantaneous plate
> voltage
> is at minimum at the same time because of the voltage drop across the
> plate load impedance. The statement applies to grounded grid or cathode
> configurations.
>
> I suspect the confusion is related to the negative feedback inherent in a
> grounded grid design and that feedback is out of phase with the input
> signal.
>
> It all makes sense when you think about it.
>
> Back to the books.
>
> 73,
> Gerald K5GW
>
>
>
>
>
>
>
> In a message dated 3/28/2010 7:03:43 P.M. Central Daylight Time,
> herzog@frontiernet.net writes:
>
>
> Another way of looking at it that doesn't require definitions of in or
> out of phase, and relative to what is the usually accepted fact that the
> input power ADDS to the final's power.
> ==========================
> RE: > Do it grid driven and GG and then tell me the relationships.
>
>> >Geez, why we have to discuss basics here is beyond me.
>
> REPLY:
>
> Grounded grid: Cathode goes negative, plate goes negative. In phase.
>
> Grounded cathode: Grid goes negative, plate goes positive. Out of
> phase.
>
> Sometimes even well-educated people misunderstand the basics, and
> that's why it needs to be discussed. A passing grade in school should
> be 100%, but alas, it isn't.
>
> 73, Bill W6WRT
> ==========================
> Another way of looking at it that doesn't require definitions of in or
> out of phase, and relative to what is the usually accepted fact that the
> input power ADDS to the final's power.
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