I don't know if I'd trust it to work properly, since 11 volts is somewhat underpowered and 19 is a bit overpowered. I guess it doesn't matter in the long run, and it couldn't hurt to test it over time on a cheap LNBF. Dunno if I'd trust it on the Invacom. The Digitrans is one heck of a piece of gear, though, isn't it?