>
> On Sat, 27 Mar 2010 21:35:13 -0400, "Gary Schafer"
> <garyschafer@comcast.net> wrote:
>
>>Jim,
>>I think that Bill needs to do a lot of reading. Orr's book is an excellent
>>start.
>>
>>In his chapter on amplifiers he specifically spells out what happens to
>>the
>>cathode current of a GG amp when no tuned input circuit is employed. He
>>describes how the cathode current follows the coax cable out to the
>>exciter
>>and back. If Orr is not believable have a look at some of the Collins
>>material.
>>
>>As to RF passing thru the chassis, again turning to Orr will explain it in
>>detail of how RF does not pass thru the chassis metal but thru holes in
>>the
>>chassis
>
> REPLY:
>
> So THAT is where all this voodoo comes from!
>
> I wonder what Orr would have thought of the disk experiment we just
> did. Twice.
>
> You are right though, I will have to GET ONE OF HIS BOOKS. Like I
> said, several people have quoted him saying a GG amp is a phase
> inverting amp. I don't doubt the quoters but I would like to read that
> myself.
>
> I'll be back. :-)
>
> 73, Bill W6WRT
>
> ## Bill, are u saying you don't have an ORR book ?????? I think you
> can still buy
> the latest edition that came out.... before he passed away. It's
> superb.
> Hardcover.. and it's blue. 23rd edition 1987. 5th printing was 1992
> I bought mine in 1994.
> ISBN # 0-672-22424-0
>
> ## What other books don't you have ??? We are going to get the
> infamous VO Stokes book
> onto the files section of the ham_amps yahoo reflector, but it will be in
> 2 x PDF's. Now,
> if we could take the stokes book.. and do a spread sheet of his tubing
> coil data, you would
> have the ultimate, bar none, tubing coil winding info. Normal coil
> formulae won't work on tubing
> coils. [that was a hint to Ian] Stokes covers tubing from 1/32" up to 2"
> It has cool stuff... like exact
> uh vs tubing diam... for a straight piece of tubing [ no coil].. which
> comes in handy for designing
> hair pins for hf yagi's.
>
> ## and yes, the output of a GG amp is 180 deg out of phase with the
> input. The 2 x are in series.
>
> ## The stokes book is called.... 'radio transmitter's.... RF power
> amplification' 190 pages
> ## Orr's book is 400-600 pages.
> ## between those 2 x books alone.. is a huge wealth of info. There is
> stuff in the stokes
> book, that you won't see any where else.
>
> later...... Jim VE7RF
You can easily prove the phase relationship with a dual trace scope. Do it
with a FET or 6C4 if you want, do it at audio or RF, makes no difference.
Do it grid driven and GG and then tell me the relationships.
Geez, why we have to discuss basics here is beyond me.
Carl
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