I tried to have a 10m QSO with Jim, KJ3N, this morning and was foiled by a nasty S-3 buzz across the entire band that pretty much wipes out all but the strongest signals. Further investigation showed that it exists over the entire HF spectrum, from 80m on up. I'm not exactly sure how to track something like this down. The 746PRO is a little awkward for portable use.
Any suggestions?
On Edit: It's not emanating from anything in my shack. I turned off everything but the rig. To eliminate a possible problem with the Icom power supply, I also listened with the 736, which has it's own PS built in and heard the noise with it as well.
On Further Edit: I got out my old Sangean ATS-803A portable SWL radio and could clearly hear the noise outside the house. Throwing the main breaker at the service entry point made no difference, so it's not coming from here.
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