my wife baked some cookies last night :)
i just metered out a urc male rs232 cable
looking at the photo above from left to right
far left = pin 5
2nd from far left = pin 2
3rd from far left = pin 3
far right/tip = no connection
essentially, by not using the proper connector, you are shorting out your pin 2 to pin 5. one thing you might be able to try, is to disconnect pin 2. what is probably happening, is the feedback coming from the projector is shorting out to pin 5, thus causing your noise. personally, i would just pick up a urc cable and connect to that.
Thanks for this dude. I think we are going to leave it the client thinks its a feature.........
I would say the problem is down tot he cable though.