On 10/17/2013 6:22 AM, TexasRF@aol.com wrote:
Jim, it is possible that the hum is present only in your local receiver and
not actually being transmitted.
As a test, you might have a local listen to the signal and give you a
report.
That's good advice. The RF may be getting into your RX via a Pin One
Problem on audio or control leads. Hum is a common symptom of a gain
stage going non-linear due to RFI. There's a discussion of "The Pin One
Problem" in http://k9yc.com\RFI-Ham.pdf and in several other tutorials
on http://k9yc.com/publish.htm in the section on audio.
73, Jim K9YC
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