4 channel video modulator

[Armyofone 0]

Though I've been in the electronic security business for almost 30 years,I've only put in maybe a few dozen cctv systems.I have a customer who wants to look at maybe 4 cameras,each on its own tv channel,I'm looking at maybe 6 tvs.I believe comcast already has amped their signal.I'm looking at a "channel plus" #5545.Could some one pleas elaborate on ease of set up,signal strength,what else may be needed,or experience with different manufacturer THANKS,ANY INPUT WILL HELP

[scorpion 0]

Up until a couple of years ago this install would have been easy.

 

QUESTION: Do they have Hi Def?

 

NO:

Then there are a lot of options.

 

http://www.channelvision.com/files/guides/diagramsLayouts.pdf

 

http://channelvision.com/files/guides/Filters_And_DigitalCable.pdf

 

YES:

Then you are going to have to run separate wires to each TV, and use a composite video input. In this case you do not need to use a modulator.

 

 

There is a technique where you can cut a coax up in the attic, and you can insert a device. This acts like an A/B switch. It will flip from cable/sat to the input that has the mod signal. This device is controlled up the coax from below with a IR coax "tap".

 

http://www.channelvision.com/products/index/88

 

http://www.channelvision.com/products/view/427/88

 

http://beta.channelvision.com/uploads/1215557281_P-0321_MixedSystem.pdf

 

 

What do you think?

[Armyofone 0]

could i not use a notch filter for ch 60-69 and use those channels with modulator?

[zmxtech 0]

very easy to have each CCTV camera on a separate UHF channel

 

there are many CATV type systems around that take composite video and sound -very good for home installs

 

search on "CATV modulator" in your area

 

for example >5th unit down

 

http://www.hillshomehub.com.au/cattleprod/products/A1205VID

 

http://www.baileyladders.com.au/resource/bundle.1/illusionId=8090&c=published&f=image:jpeg/resource/enlarged.jpg

 

http://www.baileyladders.com.au/resource/bundle.1/illusionId=10703&c=published&f=image:jpeg/resource/enlarged.jpg

[Armyofone 0]

thank you people,I spoke with comcast,they say they only have one channel open for this app.so I guess they have to stick to one camera or keep dvr on 4channel split screen,and use vga out for monitoring at dvr and maybe i can use bnc out to one channel mod.I cant see how that wouldn't work, aye!

[DaveM 0]

could i not use a notch filter for ch 60-69 and use those channels with modulator?

 

I've done just that with a 5545 modulator. It starts at channel 65 and you have to go every other channel so I started with a 64-70 notch filter.

 

With that notch you could do channel 65, 67, 69. 70 would get interference.

 

I added a second notch for 70-74 and I use 66, 68, 70, 72 as I still got a little interference on 65 and 73 from the CATV.

 

With the new digital cable channels it is getting messier. The cable company can put 10 or more digital channels onto one standard channel. If they decide to use that range you can loose a lot of channels.

 

Also, many of their cable boxes will not recognize your channels so you will need to run them through a splitter into the antenna input, with the cable box going to a composite or HDMI input.

 

As said in a previous reply, if you want to mix it with HD over the air broadcasts you are really going to have some issues as they usually transmit between 476-700 mhz which is pretty much what the modulator can use.

 

I did have a big problem getting my levels right. I ended up buying a CATV meter so I could tune the CATV output to be the same as the CCTV signals at the TV sets. (about 8db). I spent hours trying different attenuators and never could get it right on all the TV's unit I bought the meter.

 

I think the solution will be a digital modulator that can put 10 CCTV channels onto one channel space. I have not seen one for consumers yet, but I think it is just a matter of time.