Hi Scruit,
thanks for the prompt response!
Interesting question. Although the video phone itself supports 2 cameras, we only have a single camera installed. My old VCR has both an "RF" socket (I'm in the UK) and an RCA video socket, so I could try both.
I hadn't considered that it may damage my TV - thanks for the warning.
Good idea. The videophones have brightness/contrast sliders with a huge range, so hopefully they shouldn't have any problems with things getting too dark. If I get things working at my end, then I'll check that I haven't caused them any problems.
I can turn it on whenever I want and see what's going on, which suggests that the coax is always carrying the signal.
I'm going to drop by the electronics store tomorrow, grab some coax, and see what happens when I hook this up to my old VCR.
Thanks a lot for the advice. I'll let you know how it goes.
Dave