Originally Posted by Duster_360

All the failsafe is looking for is whether the signal is clean or not. Its not trying to decide if it sees two signals from two radios or not. Thats what the 3PK description meant by "clean signal".

Really the ques is what does operating two radios on same freq look like to the rcvr? Is it a 'clean signal' that causes the rcvr to go WOT cause signal is out of tolerance or somehow otherwise out of spec?

Or is it what the rx sees a form of interference that scrambles the signal and causes the run away?

Easiest way I know to figure this out is to try it - take RC and put it on blocks where it can't get hurt and turn tx and rx on and make sure its working, then turn another tx on on the same freq and see what the failsafe does. This is no diff that teting the failsafe after setup by turning the tx off.