Todd,
I had the exact same problem when I tried to use my K3 with my
amplifier.
I did not have a ground on the K3. This was a test in a high RF
environment.
When I grounded the K3 the problem disappeared.
When I grounded the power supply the problem disappeared.
I now have both grounded.
The K3 is performing as it should.
73's Ron WB4OOA K3/100 #604
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