Hi;Had posted about this to the Factory site but guess not the place to ask general questions!We had a problem the other day 2 FAST txs operating different rec.one 6E and one 7c one had 607 other 617 rec either radio could operate both receivers.Result was a big gasser destroyed and assurance from Futaba this not possible!!It Is!!I watched as they checked out the planes.both txs operated either rec!!Then went to another plane bound the 7c to it and worked fine turned on the other rec and it went crazy.Both units worked fine unless the other was turned on!!HAS ANYONE ELSE HAD ANY THING LIKE THIS????Guess this is more appropriate place to ask this than on there site!Like to hear if you have!!We bought these units to avoid this sort of thing.Needless to say my friend with the gasser has put all his planes back on the PCMs he had been using!Expensive when they crash!!Good Luck!