So you could use a diplexer with a 950-1450 Mhz port and a 5-900 Mhz port and share the same cable, and even pass voltage over that cable only passing on the satellite side. 10+ years ago cable TV freqeuncies were basically 5-900 Mhz (today depending on the cable system it could go well into GHZ, and sat +2Ghz). For example "legacy" satellite signal was 950-1450 Mhz. Then add a low pass filter on the leg going to the TV and a high pass filter on the leg going to the CCTV camera.Īssuming I can find RG6 couplers that act as low pass or high pass filters like I'm suggesting, is there any reason this wouldn't work? Or would I still see excessive noise? If so, what would be the source of the noise, and is there anything else I could do to get rid of it?ĭiplexers work when combining 2 different blocks of frequencies that already do not conflict with each other. On the other leg I'd have the run out to the TV, unfiltered since it would carry both signals.Īt each TV I'd have another splitter/coupler connected to that cable, unfiltered on that connection. To that I'd attach a splitter/coupler, and one leg would go towards the DVR, with a high pass filter on it to block out the TV signal. So I was thinking of something like this in the closet where all the cables return:Įach cable coming out of the splitter going to the TVs that I want to also run CCTV on I'd attach a low pass filter to screen out the CCTV signal. And doesn't cost so much that drilling through concrete to run new cables becomes the cheap option!Ī diplexer is essentially a splitter/coupler with a high pass filter on one leg and a low pass filter on the other, right? While they make them for satellite to separate signals above and below 900 MHz, I need one that separates signals somewhere in the range of 6 MHz to 50 MHz, between the top of the baseband composite video feed and the bottom of the TV band. I just want to know whether there's any way the video signal for the CCTV cameras can be sent back to the DVR over the same cable without interfering with the TV signal. Power is available at the camera locations, so if I can share the coax for TV and CCTV but not power that's not a problem. I was hoping there was some way of sending out the signal (broadcast, not satellite) to the TVs and using the same cable to carry the CCTV analog video back to the DVR. The cabling from the TVs is run from a secure central location where I would locate the DVR. There are 5 locations I want to run CCTV to using simple fixed dome cameras, so I'm planning on buying a system with a DVR that can handle 8 cameras to leave room for possible expansion. Therefore I'm hoping there is some way I could use a diplexer or similar solution to run both signals over the same cable. Due to the building construction, either running additional cabling or using wireless would be very problematic. I want to install CCTV in my business, where I currently have RG6 cable run to TVs near to the locations where I'd like the cameras.
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