I have an issue on 40 meters from my tentec scout 555. After the rig is
tuned (mfj 901b) and I tx cw, I get an AC hum in my headphones on every
key
down. This doesn't happen when my audio comes from the rig. I am using
an
alpha delta loaded antenna in the attic and it is almost certainly putting
the tuner to a test. Is there something I can do to alleviate this
problem?
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I have the same problem with phone on some higher freq HF bands and solve
the problem by reducing RF output.

Frank GM0CSZ / KN6WH