I have a house that has two camera location prewires that run from the entry doors to a Home director can with th ePL-01 trim kit. My question is the pre-wire consists of only a single RG-6 cable. No cable for power. Now I know I've seen a couple of cameras that run video and power through a single coax but I was wondering if there was another way around that so I could get a better selection of cameras?

What about finding some nearby power and wiring an outlet in the ceiling (Or wherever) and using a plug-in transformer? Most cams work on 12VDC or 24VAC so it should be pretty easy.

You may try searching for a 'power inserter' or something like that. It may be possible to make such a thing.

A power inserter could probably not be done. The better solution would be as McNasty suggests, but maybe just replacing the last ?? feet of RG-6 with the "siamese" cable that is available with RG-59 and a pair of 20 gauge wire in the same outer sheath.

I don't think you could make a power inserter because the sync pulse of the video counts on the video voltage 0.3 volts to 0.0 volts about sixty times a second. If you inject DC into this, you will destroy the zero volt reference. If you come up with a circuit that will add the DC to the video, you will have to build something huge compared to a camera to make that happen. And if you have to supply AC voltage to the camera, you have the same problem made worse if the camera is color because the color sync is not exactly 60 Hz, so you would be building massive hum into your signal.

Sorry.

There is a large selection of cameras available with power and composite pictures combined on a singe coax. If quality is your problem check out 1-800-ademco-1, sales support to find your choice in color or b/w. If not the last reply as to re-pull and add a power wire (if possible) is your best choice.

good luck

This message was edited by bogans on 10/06/02 03:32.04.

Thanks guys.. I really don't want to add aditional cost to the homeowner by having to rerun the new lines or mounting a plug in the soffot (sp).. I think I will just settle with one of the cameras available for this install. Anyone recommend a particualr b/w for entry way cameras?

ustech makes cctv cameras tghat are powered off the same coax that feeds the signal hence needing only one coax run to the camera. I have no idea where to find them on the web, sorry about that...

Joe

try using diplexers at both ends, send power down satellite leg and video down antenna leg. You'll have to use coax for power (center being positive & outer shield being negative) I've never done this myself, but its seems to work with sat rec.

JHILLA, diplexers work with satellite receiver signals because the DC is WAY far away from the RF frequencies involved, so it is easy to build a small filter to separate and combine the DC and RF. Diplexers are usually rated on the antenna/cable side from about 50 - 850 mHz and on the satellite side from 950 - 1450 MEGAhertz. Composite video starts with the 60 HERTZ sync pulse, and only goes up to 6 mHz with the fine picture detail and the color signal (if present).

I see my earlier reply includes a nonsense sentence that I did not catch before I sent it: <>

This should be "I don't think you could make a power inserter because the sync pulse of the video signal pulls the video voltage from 0.3 volts to 0.0 volts about sixty times a second."

And, sure enough, the sync pulse will never be able to pull the video signal from 0.3 volts to 0.0 volts if you impress 12 or 24 volts DC on top of the video signal. Without sync, there is no image.

I know there is a way to do it because I have seen it done with Home Director NCCV04 Camera. I was just wanting more options but there really isn't unless I pull cable.. Thanks guys..

---------
NCCV04
"The VisionPoint CAModulator lineup provides one of the most innovative solutions in residential camera applications. It is the world's only camera with digital RF modulator combination (patent pending.)
This unique solution provides a "one-coax" installation where the power and video output for the camera share one coax cable. The output of the VisionPoint camera lineup is a television channel that can be distributed via a cable distribution system to all of the televisions in the home. No monitor is required. The VisionPoint camera lineup provides a channel range of 14-69 UHF and 70-94, 100-125 cable and is FCC tested and compliant. Each of the cameras requires the additional purchase of the NCCV01 Camera Power Kit to ensure proper power is provided to each of the numerous cameras in the application."

Just letting yall know that I found out that NetMedia makes the camera like Home Directors and sells for about $180 rather than the HD price of $220
still a little high for a typical homeowner.. maybe..

Could be...But how many "typical" homeowners do you know that have CCTV? CCTV isn't a typical thing to have in a home, it is something that is very cool to have though. And unfortunately, being "cool" and having cool gadgets costs us.

I know it isn't really typical but this particular developer is requiring every house in its ddevelopment be wire with front and backdoor camera locations and i was wanting a good angle for the homeowners out there. its already setup all they need are some cameras mounted.. i was hoping for a good camera for about $100 that would do it. It is a lot easier selling a lower priced product to a customer not knowing he wanted it than an expensive product. For the guys that want the cameras the $200 cameras won't be a hard sell..

OK, the Home Directors work on a UHF or cable channel...how does that integrate into a customer's cable or satellite system so he can just change channels and not have to change inputs on his TV, etc?
=Tom

Eric,
the whole picture changes when you say the output from the camera is modulated. Of course you can use a diplexer; the DC (maybe even AC?) goes on the DC portion of the SAT side, the UHF goes on the UHF/VHF side.

SOAP BOX TIME: PLEASE PROVIDE US WITH MORE COMPLETE AND ACCURATE INFORMATION THE FIRST TIME (! ! !) SO WE CAN ACTUALLY HELP, NOT JUST TRY TO HELP.

Tom,
I don't understand your question. The answer seems to be your question minus the "how does" :
that integrate(s) into a customer's cable or satellite system so he can just change channels and not have to change inputs on his TV, etc.

With, of course, today's drawbacks: OTS digital channels and digital cable channels can muck up modulated local signals on channels that seem to clear when you view them with a regular TV.

Ernie