my house has 8 cameras feeding into RF modulators which convert those to 8 analog cctv channels. when i combine those signals (via a distribution amp) with my digital cable tv service's coax, i can see 5 of those 8 video channels. i believe the other 3 channels are suffering from some interference or incompatibility with the analog video. (1) is there a way to shut out specific digital channels or any other way to bypass this potential compatibility? or is there a digital channel modulator (replacing my current analog equipment) that i can use to assign each camera signal to a digital channel that can exist with my cable tv service?