DES wrote:

...
Cable. And the house was completely rewired inside and out about 4
yrs ago.

Just had the cable company out here last week, and they said there was
nothing they could do because everything was in working order.


I have had interference from neighbors with CB units. I have had RFI
from my own equipment--mostly with my VHF xmitters and old coaxial tank
circuits. In every case of mine, going to a cable company completely
removed all RFI ...

Still, I wonder about a stub trap/filter made out of coax, on a
tee-fitting and the length pruned to rid the offending freq(s.) I have
only done such a thing in the past when I was using twin-lead and was
able to construct a trap for an offending VHF freq out of two ~8 inch
lengths of twin-lead with a variable cap the ends of the
twin-lead/8-inch sections (other two ends of these were shorted to form
series loops with the twin-lead sections.)

I have never had to duplicate the above with coax ... but I am sure
someone here has played with such enough to be an expert ... other than
that, I would have little experience to offer ...

If the signal is coming across the ac power, perhaps a "brute force
filter", but I haven't seen one of those to purchase in ages. The
internet or hams here may have construction details ...

Regards,
JS