[Max Ripple]

Thanks for the replies.
It's a common infra red system,with standard operation.
Ie,the actual remote control keystrokes create data that modulates a carrier wave,this then in turn modulates the ir light beam.
Instruments(mine at least!)seem only able to display the composite signal,and it's tricky to distinguise between the components of the signal.
Info on the machine that uses the device seems to be unobtainable,as that would be the easy route to establish the spec.
I probably should get out more,but it's one of those nagging techo questions that keep coming back to haunt!
Nick