Issues with colour output from a camera

[Alex@POD]

Hi all, I have a little problem that I'd like some input on:

I have been handed over a project for work, where we use wired cameras coupled to wireless transmitters, for viewing on a handheld monitor (within 10 metres).
The issue I'm having is the picture is sometimes black and white, and most of the time in colour. I have tested a batch of components and cannot identify where the problem is, as cameras will work fine with some transmitters and not others, and likewise, some transmitters will show a colour picture with some cameras but no others.

What could be causing this problem? As it's not consistent (eg a given camera is always black and white), I think this is a conflict between the components, but what governs the picture's colour (or lack of?)?

Thanks in advance.

[markmullen]

You've swapped cameras and transmitters, have you checked the wires? That to me sounds like a connection issue.

[Alex@POD]

markmullen said:

You've swapped cameras and transmitters, have you checked the wires? That to me sounds like a connection issue.

The cameras are plugged via a 3.5mm jack in the transmitter, the wire is part of the camera unit (hard wired into the camera, male jack at the other end), so I can't swap them, and as such I don't think this can be where the problem is?

[ian in lancs]

are they OK via USB?