watching cctv analog video along with digital channels

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?
ysleegesecAsked:
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gheistCommented:
Buy bigger mpeg encoder that can encode all channels you need.
David Johnson, CD, MVPOwnerCommented:
i believe the other 3 channels are suffering from some interference or incompatibility with the analog video. if you change the input/output order can you see the 3 that you can't now and not see 3 that you previously could.  You could use a lo pass filter but every time the cable company changes channel assignments you'd have to re-do your filters or change your output channels. What was good in the past that worked just fine doesn't in this day and age when the cable companies tend to use every digital channel available. Channel Vision makes a switcher which is basically an A/B switch that can be remote controlled over I/R (and over coax) to switch your cable from digital cable/their digital outputs.  Some cable companies assign a digital channel to Analog 59/Digital 999'Lobby Vision' for CCTV
http://www.remotecentral.com/cgi-bin/mboard/rc-custom/thread.cgi?21855
http://www.hometoys.com/article/2007/06/video-modulation-over-digital-cable/881/

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ysleegesecAuthor Commented:
Probably not going to solve my problem but at least I understand the challenges better
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