12vdc Through Coax (Pre-existing setup)

[lukey_088]

Hello there,

Just a quick question regarding a simple upgrade on a pre-existing surveillance setup we have in a particular area. A few things I should let you in on here, this work place expects security yet there is no real budget for it, if it were up to me everything would be torn out and done again.

The old system consist of 4 cameras, a Panasonic video recorder and a Panasonic monitor. The power for these cameras are powered by 12vdc which is supplied from the monitor via coax with BNC ends.

As I have not been given any other resource but enough money for a simple DVR (to save time on tape changes) I can not run any cable for the 12volt the cameras need, plus I do not want these on a multiplexer anymore, thus eliminating the old monitor and the 12volt supply from it.

Is there anything that anyone knows of that can send voltage down the coax but still have the output from the camera I can put into the DVR.
preferably 4 channel.

Once again i know this is a very poor way to do things (Maybe i've spent enough elsewhere ;-D) but its all i've got to work with.

Cheers,
Luke

[iStorm]

No you cant sorry, What you need is RG59+2 cable, that will carry your video signal and power! hope this helps

[zodiac]

a possible alternative (hard to say though) is to connect to local power sources (if there are any) so that you can power the camera's locally and then you just have to transmit the signal back throught the co-ax

[Rhino]

New to ths game but the RG59 + 2 is a quality option but where and how do you terminate the twin power to the camera and to what power source.

[iStorm]

A psu sited by the monitor would not be an option? I know the op said he didn't want to run anymore cables but he wont have any choice unless he can find a power source next to the camera's as Zodiac posted, the only problem then is that you will need a power source for each camera meaning 4 psu's!!

1 Option run rg59+2 from the monitor to the camera's ( 1 psu + Drum of Rg59 )

2 4 Psu's sited by each camera

[thecctvguru]

You can send power up the coax, the devices are called Video Line Drivers.

Basically they send the power up the coax, and then take it out at the other end, giving you a 12v supply. (with the video sent back using an RF signal).

We sell them for about 105 a pop...