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[TenTec] re amp keying loop weirdness

To: tentec@contesting.com
Subject: [TenTec] re amp keying loop weirdness
From: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 23 Feb 2006 23:17:54 +0000
List-post: <mailto:tentec@contesting.com>
I'm more inclined to think Bob is right.   the keying is done by one side of 
the cable going to ground potential.  i don't think it is a shielding issue 
and i operate almost 100% below 10 MHz so I think that rules out the 1/4 w. 
idea and everything was well grounded -- large straps to s.p.g. and 6 foot 
strap to 5 rods outside.   Also seems to me that common mode rf would have 
to be some nasty amount of rf to botch up a switching circuit.

rob / k5uj

<<<qsk lines are very low speed, and i would be more concerned that his
radio shack audio cable was poorly shielded and/or some multiple of a
1/4 wavelength of his operating frequency making it much more
susceptable to rf feedback. a good station grounding system would help

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