"Alan" wrote in message
...
Does anyone here know of a supplier of an adaptor to allow me to send
composite video over CAT5 cabling?
Situation is I already have CAT5 installed and adding dedicated video
cable
would be *really* hard work. I believe CAT5 can do this, just a question
of
using the right pairs.

Alan.



What type camera are you using? Is the CAT5 buried in the ground? Is it
running close to any mains AC cables?

Composite video signals at 1 Volt peak to peak from any camera can be sent
through CAT5 as long as the cable run is pretty clean from nearby outside
interference. It may also have a bearing if you've used cheaper quality CAT
cable, as the internal twisting on the pairs isn't always close wound enough
to prevent cross talk of signals. A decent quality CAT cable has enough
twisting on each of the pairs to allow composite video through though.

To check the quality of the CAT cable just look at the pairs after taking
the outer sheath off. If the pairs are wound (twisted) together at around
an inch separation, then the cable may not carry video to clearly over long
distance. If, however, the twisted pairs are wound to a half inch wrap, the
cable will carry video perfectly clear over a good 200 to 300 mtrs without
to much decay at the receiver end.

One of these at each end of the CAT cable should be enough:
http://www.tait-components.com/Produ... Cctv&iPage=1