The problem was isolated to the CAT plug. The only way I found it was that
when I physically touched the shell it was microphonic. In other words, I
could hear myself running my fingers across the connector in the headphones.
I unscrewed the jack-screws and the problem disappeared. MicroHam pots
MicroHam pots the inside of the connector with white RTV, so it is
impossible to know if there is any sort of ground pin issue.
Yes, they do... But, it pulls off quite easy, and what's left I have removed
with an old stiff tooth brush.
73,
Andy
http://gd0tep.com
In other words, I could hear myself running my fingers across the
connector in the headphones. I unscrewed the jack-screws and the
problem disappeared.
Unscrewing the jack-screws provided a mechanical strain relief between
the plug and the KIO3. I would bet the problem still exists in
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