Date: Sat, 27 Mar 2010 19:49:30 -0700
From: "Bill, W6WRT" <dezrat1242@yahoo.com>
Subject: Re: [Amps] 'good engineering'
:
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
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