Hans' suggestion of microphone can be found on the beta page: under the heading Microphone Choice.? Though I suspect this microphone is more sensitive than needed for HF radio transmission.
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I had a similar issue with the noise you describe when not speaking.? I found it was caused by having the Mic. gain set a little to high.? The sweet spot for me was to actually transmit silence and dial the gain down until that noise disappeared.
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My Mic. gain is set at 75, with Mic. compression set at 14, and Transmit EQ. Global gain set at -8.? Just for reference as all Mics. are different...
