I recently (today) bought a Sony MRD-D1 modulator to distribute my Tivo and DVD player through the house. But, I seem to have an interference problem. Here's my setup:
CATV comes in the house, into a Channel Vision 2/4-PIA amp/splitter and out to the TVs. The MRD-D1 output goes into the other input of the amp (which was designed for exactly this purpose).
Now, when I tune cable channels above 72 on my TV, I get pure snow. But, when I try to use any of those channels (up to 86, which is the limit of the MRD-D1), I get a really awful picture. How awful depends on the channel I use, but at its best there is still a _lot_ of interference, I would call it unwatchable. I also tried channel 64 (63-64 are also unused), where the picture is a lot better, it still has some interference there (probably because 65 is used), but it is much better than 73-86.
I know that the problem is CATV interference, because if I unplug the CATV from the amp, the MRD-D1's picture is perfect on every channel.
So, what is up there causing the interference? My guess is digital cable... I searched the Web but I can't find out what freqencies that they typically use (my provider is AT&T), I can't imagine what it would be other than just above the analog channels. So, if that's the case, I guess a low-pass filter won't help me. Or, more accurately, it will help the modulator at the expense of all of the digital channels, right? Maybe if I get a better modulator (that goes up to ch. 135), I can get up above the interference?
Any suggestions would be greatly appreciated... Why isn't this stuff ever as simple as it seems? http://www.avsforum.com/ubb/smile.gif