RE: Brownouts....
Bob- Your "hope" is not going to happen.
Spread Spectrum (SPEKTRUM introduced it to model fliers), is a computer based system -
The concept is nothing like the old radios you mentioned -
Just like ANY computer based system, it is a digital system which requires startup procedures and must maintain a particular voltage level to keep operating - if power drops it MUST start over -that reconnect can be very fast but it is not a "fade away"..
You can't make it fade out n fade back in .
That is grossly simplified -but thats how it operates.
PS the Futaba - all of em operate the same way - there is no servo fade out then rx fade out
There can be a lower voltage trigger point which will cause an alert - such as throttle shut down -which can be operator restarted but that's the only safety I know of other than a servo "hold"
SPEKTRUM does use a low voltage trigger " to connect a light on the rx which remained on as a notice the radio had seen a lower than acceptable voltage spike -or shut down and restart. This is used on some DSM2 systems.
failures in power systems is still # 1 cause of "radio failure" in these spread spectrum systems
Why?
operator error typically due to lack of familliarity with how these systems operate -at a user level..