[Wayne A. Pflughaupt]

- Hum was from CATV line - jack outside looked like it had a grounding connector, but not grounded anywhere.

Run a wire from that ground block to your electrical ground rod. You can get a clamp at the hardware store for the ground rod, if there isn’t one already there, that will accept the ground wire. I think the ground wire should be 10 ga. or so – I forget.

- Changing AC outlet to match that of rest of system did not change anything.

Not sure I follow. You mean plugging everything into the same outlet or circuit? I’ve never heard of “matching” AC outlets before.

- Using the BFD itself to tune out the hum worked fantastically well (most of the audible hum was around 160 & 320 hz.)

Wow, what a great idea! I’m surprised no one has come up with that before – despite the endless threads dealing with ground loops.

Regards,
Wayne