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. He specifically states how current on top of the chassis reaches
the bottom side of the chassis.
For anyone that would like to read this it is in chapter 17-4 of the 17th
edition of his handbook. That is page 364.
With a different version of his book the chapter will probably be different,
but it is under "transmitter design, grounds".
As to Orr stating that "a GG amplifier doesn't need to be neutralized" that
is not true. What he does say is "it makes neutralization unnecessary in
many cases". Then he goes on to describe various neutralization methods in
the next few pages and tells you why some tubes may need it.
And I think that Orr knew what the phase relationship between plate and
cathode were.
Sometimes a little reading is better than inventing explanations. All of
this stuff has been done before.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Jim Thomson
> Sent: Saturday, March 27, 2010 11:27 AM
> To: dezrat1242@yahoo.com
> Cc: amps@contesting.com
> Subject: Re: [Amps] 'good engineering'
>
>
>
> --------------------------------------------------
> From: "Bill, W6WRT" <dezrat1242@yahoo.com>
> Sent: Saturday, March 27, 2010 6:20 AM
> To: "Jim Thomson" <Jim.thom@telus.net>
> Cc: <amps@contesting.com>
> Subject: Re: [Amps] 'good engineering'
>
> >>## Remember that argument
> >>about how a simple tuned input works, and how, without one, the
> return
> >>current is via the coax shield going back to the xcvr, then up through
> the
> >>load cap of xcvr.. and back down center conductor, back to cathode.
> You
> >>still don't believe it, even after Tony King posted the Orr classic
> >>diagram
> >>on the other reflector. I bet you $1000.00 CASH, that's how it
> >>works.IOW,
> >>put up or shut up.
> >
> > The Orr Classic diagram proved nothing because the supposed "return
> > path" you were so hot about actually ended in mid-air and wasn't
> > connected to anything. Remember? Where's my money?
>
> && say what? It ends up back at the cathode, completing the loop,
> Fig 22
> in any orr book. 'Untuned cathode circuit grnd return'. Cold ends of
> tune
> + load
> caps... along the chassis, down the braid of coax to exciter... up
> through
> load cap
> of xcvr... down the hot side of the coax..... back to coupling cap...
> which
> bonds to
> cathode, completing the loop. We are talking about the 210 deg
> pulses
> from the
> anode... which are aprx 3 x the dc plate current. [ IF a PI tuned
> input is
> used, the C2
> cap of the tuned input, has to handle these pulses.. PLUS normal
> current
> from the
> xcvr. ]
>
> && Bill, it appears you have missed the basic concept of how a GG amp
> works.
> Perhaps a review of Ch 15 is in order. RF just doesn't.. ..'end up in
> mid
> air'
> >
> >>Now ur spewing BS, about how RF bores right through solid 1/8" AL.
> >
> > Proven by two independent experiments with copper sheet, not aluminum
> > and it never was about anything 1/8" thick. Pay attention.
>
> && depth of penetration is .05mm on 160m... and .01mm on 10m. Sez
> so, in
> Bings
> RF software package.
> There are a LOT of holes surrounding the tube /socket. Has to be... to
> get
> the pressurized
> air from below chassis.. to above chassis.
>
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