types of tvi interference

[209 first class]

i have read posts about getting your antenna up high so it doesnt come over the neighboors television ect. i didnt think that was possible, as i assumed tvi was the unused portion of the transmitted rf traveling back down the coax shield, to your eqpt then to the wall socket which happens to be directly connected to your neighboors wall socket by copper wire. i have noticed a mobile outside the house in the driveway will make white bars/fuzz appear on the tv screen but no voice comes over it. cranking an amp in the house makes no white bars and fuzz, but i can hear the voice thru the tv. is that just my station or have you guys had the reverse happen with hearing a mobile over the tv, and only white bars/fuzz with the base station? 209

[dud muck]

Raising the antenna helps because it moves the strong field up & away from the house.
Yes, part of TVI can come from RF on the coax shield, but as the smart people here on this forum pointed out, it an also come from the guy wires, so they point out why insulators are needed on guy wires. If RF on your coax shield is causing trouble, then ferrite beads on the coax will reduce that.
About TVI coming through the wall socket: Often the mistake is made of grounding the base-station antenna to the same ground as the AC electrical ground. This is a big mistake, because radio station grounds should be your own c0pper ground rods.

One difficulty of TVI is that its often difficult to tell if its your "fundamental frequency" of 27MHz thats causing the trouble, or your harmonics at 54 or 81MHz, etc. If CB transmissions are being heard on telephones and computer speakers, then its the fundamental frequency of 27MHz causing the trouble. If its only CB transmitter harmonics causing trouble, then low-pass filter on the CB is needed.