Yep, the filter is put on the pole before the wire goes to the house. I was simplifying a bit. If you're internet-only, they put on a filter that will block all the analog signals. (It still works reasonably well as an FM antenna with the right matching transformer though...go figure.)
Quote:
Originally Posted by brk-lnt
In your case it sounds like a tech didn't install a filter or installed the wrong filter, or the filter is slightly out of spec. In any case, your TV is picking up some signal level that it is able to tune to. The nice thing about QAM, unlike analog signals, is that you can sometimes lock onto a lower-level signal and still get a good/usable channel image (the probably of that channel not containing total garbage in terms of the quality of the program is another issue altogether  ). |
Exactly what I suspect happened, and I have to believe it's not uncommon. The old analong bandpass filters had the same problem, and since they didn't want to adversely affect the legit channels, plus some tolerance variations, it wouldn't cut off exactly at the channel frequencies they were supposed to, so you'd get some leakage there also. If (as in my case) you're internet only, they don't care much about affecting adjacent analog frequencies so much, and the filter they put on is...
effective.