Yes, you understand properly, or close...I don't think it has to do with the strength of the signal, it has to do with the decoding from the receiver. If, for whatever reason, the receiver is not able to decode the coding from the TX, it will go into failsafe, after a certain delay.

Now, what happens into failsafe, depends on how it has been programmed, or not. On my case I related previously about the Maverick, it's partly my fault, as too new to PCM I had NOT programmed servo positions in fail safe, and as it was a second hand receiver, I am pretty sure my servos went into whatever was programmed previously ( or not).

With my actual IPD receiver, it's so easy to do that it is done...

Bernard