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


Camera not purchased yet but will only be security type, not broadcast
quality. From memory CAT5 is good quality with tight wrap, will check. There
are no mains cables along the run, which is probably ony 30m.

That device looks ideal for the job. Thanks for the link.

Alan.