[TVI-RFI-EMI] Help - In house TVI on cable sets

[kblists at comcast.net]

I'm new to HF operating at my home qth, after passing the general 2 months ago.  Prior I have operated 2/440/6m to coax fed yagi's without any interference problems.

My initial interference began after I whipped up a coax fed 20m dipole and ran it in the backyard for an afternoon with the rig on a picnic table and a dubious ground.  Family reported interference on our living room flat panel LCD.

I had a random V dipole up for RX fed by coax for a few years, apex on the roof to yard corners.  I installed an RF ground (8 ft rod to 1" copper braid to a bus bar, and 1" braid to tuner & rig keeping lengths as short as possible), changed out the coax for home made window line, and purchased a tuner. I ran that for a little while on 18-80m without any known complaints.  Recently, a friend and I raised that dipole some 10 more feet, balanced it, and TVI returned.  I'm still a little short of detailed testing, but 20m seems to be the worse, on at least 2 TV's in the house.  I disconnected the tv coax on one TV and did not have interference when disconnected.  I do get some audio on a set of computer speakers elsewhere in the house.

At this point, I've been reading what I can, and am finding lots of differing opinions on how to resolve the problem.  At present, I've only had complaints from the family, not from neighbors at this point.  Radio is a 5 year old FT-897D, with the antenna and ground system mentioned, running 100 watts max.

Kevin
N1VMJ