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[Amps] Use of Manual T/R Switches

To: <amps@contesting.com>
Subject: [Amps] Use of Manual T/R Switches
From: n4zr at contesting.com (Pete Smith)
Date: Thu Mar 6 16:31:14 2003
At 04:15 PM 3/6/03 -0500, Bill Fuqua wrote:
>I would expect the shot noise from the random arrival of the electrons 
>(shot noise) on the anode would
>create so much noise that you could not hear any stations at all. That is 
>one problem with
>electronic TR switches is that on receive you have to bias off the final 
>otherwise the
>noise is too much.  Discovered this with my Johnson Challenger in the 
>60's. It had
>a clamp tube that limited plate current on transmit but did not cut it 
>off. Makes a great
>white noise source.


It was a class C amp which, as I recall, was totally shut off on 
receive.  The thing worked FB as a QSK TR switch, while it lasted.

73, Pete N4ZR
The World HF Contest Station Database was updated 23 Feb 03.
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