"Any ideas on which devices are suspect?"
I'd suspect the wireless voice/data/modem extenders/phone jacks, popular
from the late 80's, maybe early 90's, onward. Perhaps not so popular
now, but the thrift shops are full of them for a few bucks a pair, so
stands to reason they'd still be in use. Most operated in, or around
80m, for some reason. I used to hear several of my neighbors phones on
them, usually voice, sometimes fax, data, modems, et cetera, whatever
they would normally plug into a jack.
Interesting side-note, the old cordless phones with speech inversion
"security", could be heard flawlessly with an Icom IC-706 MKII on HF in
RTTY-Reverse mode, whether the 80m phone extenders, or even the 4x MHz jobs.
Kurt
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