Hi,

I've measured 5vdc between centre pin and outer & centre pin and earth. I sure it's a true 5vdc. This occurs even when it is setup as a DVB-c. I'm guessing this must be a common issue with all VU+ devices, may be driver related. If someone else could measure theirs It would be good to confirm it as I could then rule out a faulty tuner.
BTW, if you connect this to a VM feed surly you would be sending 5vdc to all other pieces of equipment within your house.