And plenty of other ingress/egress points in any real world amp as mentioned
over and over. Even a thru bolt can transfer RF.
Carl
KM1H
----- Original Message -----
From: "Gary Schafer" <garyschafer@comcast.net>
To: "'DF3KV'" <df3kv@t-online.de>; <amps@contesting.com>
Sent: Wednesday, March 24, 2010 11:25 PM
Subject: Re: [Amps] placement of RF choke bypass cap.
There is a large hole in the chassis where the tube passes thru.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of DF3KV
> Sent: Wednesday, March 24, 2010 8:46 PM
> To: amps@contesting.com
> Subject: Re: [Amps] placement of RF choke bypass cap.
>
>
> OK, lets talk about a water tight chassis used for a GG amplifier.
>
> The grid of the tube is screwed to the top of the chassis.
> Under the chassis the driving signal is connected via a pi network to
> the
> cathode.
> How could the rf input signal develop a drive signal between grid and
> cathode when there is no rf path to the grid through the chassis?
>
> 73
> Peter
>
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On
> Behalf Of Gary Schafer
> Sent: Mittwoch, 24. März 2010 22:24
> To: dezrat1242@yahoo.com; amps@contesting.com
> Subject: Re: [Amps] placement of RF choke bypass cap.
>
>
>
> > -----Original Message-----
> > From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> > On Behalf Of Bill, W6WRT
> > Sent: Wednesday, March 24, 2010 4:23 PM
> > To: amps@contesting.com
> > Subject: Re: [Amps] placement of RF choke bypass cap.
> >
> > ORIGINAL MESSAGE:
> >
> > On Wed, 24 Mar 2010 15:45:02 -0400, "Gary Schafer"
> > <garyschafer@comcast.net> wrote:
> >
> > >
> > >Bill,
> > >How many times do you want me to quote you saying that "skin effect
> > does not
> > >keep RF from flowing thru a plate"? it has been in almost every one
> of
> > your
> > >posts. That is what started this whole thread and continues it.
> >
> > REPLY:
> >
> > At this point I'm not sure what you are arguing about, Gary. I said
> > that skin effect certainly exists but it does not prevent the
> > simultaneous flow of electrons through a plate at 90 degrees to the
> > skin current. Both events can happen at the same time, as was proven
> > by the two gentlemen with the disk experiment. Skin effect current was
> > flowing over the surface of the disk as a result of the disk's
> > capacitance, and at the same time antenna current was flowing straight
> > through the disk to reach the far end of the antenna or loop, WITHOUT
> > having to flow around the radius of the disk in the form of skin
> > current.
> >
> > This is analogous to the chassis in the original discussion that was
> > carrying skin current but was also passing RF through the thickness of
> > the sheet metal. Both events are happening at the same time.
> >
> > It's perfectly clear to me. Where are we mis-communicating?
> >
> > 73, Bill W6WRT
>
> It is analogous to nothing! One is an antenna and the other is a chassis
> that we were talking about. Very different things going on there. And
> no,
> the current still doesn't flow thru the antenna disks as you would like
> to
> believe.
>
> How is it that you say you believe skin effect exists and still insist
> that
> RF current can flow thru a surface by some other means?
>
> How about addressing the chassis rather than trying to divert the
> discussion
> to something else.
>
> Why do you think that w8JI's experiment shows that RF current doesn't
> pass
> thru the sheet?
>
> Why do you think RF does not pass thru a screen room wall. You can
> connect
> whatever you like to one side and it still will not pass thru to the
> other
> side.
>
> 73
> Gary K4FMX
>
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