"The invention of the 'choke joint'."

Excerpted from:
http://www.ieee.org/organizations/history_center/oral_histories/transcripts/
ramsey1991.html

``Ramsey: ... Eventually we learned the art. That's one of the things we
were learning. Initially, most of the laboratory waveguide work was being
done by the three centimeter [10 GHz] group because the ten centimeter [3
GHz] group was still dominantly working with the coax lines.   [snip]  I
remember for example just one of the problems. When one just wanted to
fasten two waveguides together, one either butted them together and hoped
they wouldn't spark, but you could see those little sparks at the joint. Or,
else one had fingers inside where you put them together, but these tended to
spark and destroy the impedance matching.

Bryant: Spring fingers?

Ramsey: Spring fingers, yes. Then we tried the trick of using a butt joint
with a **choke**, which worked quite well. So we shifted over to that. As
far as I know that was my invention, although Shep Roberts in the Radiation
Lab joined in that work. ''

** End of excerpt **

Jim


----- Original Message -----
From: "Nigel Goodwin" <nigelg@LPILSLEY.CO.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 27, 2001 1:24 AM
Subject: Re: [OT]:Microwave Oven


> In message <011a01c12e7c$7a7820c0$0100a8c0@piii500a>, Jim
> <jvpoll@DALLAS.NET> writes
> >     "That would be just too neat to be
> >      achievable with a simple hinged door
> >      and some stamped steel and colored
> >      glass.
> >
> >Ever heard of, or seen, a "choke joint"?
>
> Personally I've always heard it called a 'choke seal'. We get a lot of
> people asking for their new ovens to be tested as they can see light
> through the door seal, or steam escapes.
>
> Another point to bear in mind is that you don't have 700W wildly trying
> to find it's way out of the cavity - most is absorbed by the load in the
> oven (which should never be used empty).
> --
>
> Nigel.
>
>         /--------------------------------------------------------------\
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>         | Lower Pilsley   | Web Page : http://www.lpilsley.co.uk       |
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>
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>

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