[russell]

The tether overrides the radio modems automatically. If you have the tether hooked up it is used for all comunications, which is probably why your radio modems dont appear to be working. I would try unplugging everything from both ends except a battery on the RC then slowly plug things back in one at a time to try to isolate the problem. It might take a few hours, but if it took nine hours but you dont fry anything and you find the problem, then you would be saving a hundred bucks an hour over frying it and having to buy a new control system. Innovation First totally rips you off on those. All they have is two chips in them that cost seven dollars each without a bulk discount! Then there are probably a few capacitors and such for measuring the analog inputs, but it certainly isnt worth the 500 dollars they want for a new RC.