last night i had two great flights with my alpha 60 afterwards i cleaned everything up and was going to put after run oil in my carb i turned my radio back on(dx7) and then my receiver and had nothing it was like the battery was dead or unhooked just a slight flash on my receiver so i got my bind plug and rebound it and now it works find what would make this happen? im afraid this might happen in flight

I've had the same thing happen to me. What I found was that when I had the transmitter on my flight box the bind button was resting on the flight box handle so when I turned it on the bind button was depressed and I would lose my bind. I have never lost a bind in flight.

I imagine your bind button was depressed somehow when you turned your radio back on. I took me a while to figure out what was going on with my radio.

Often, you may turn the RX on first and it will just sit there doing nothing. The process should be TX on first, then the RX. Try that.

CGr

This has happened to me more than once and I can pretty much guarantee I didn't depress the trainer switch (although that's a pretty good guess on why it may happen.

Does make you nervous for a few flights though, just in case it happens.

I did actually lose all signal with my Spektrum once, don't know why but the plane went in but with minimal damage.

Batteries were low-ish but well before any batt alarm.

never thought of this but it makes sense im sure i probably just hit the button that would be very easy to do! thanks for the info!

It's not the trainer switch, it's the binding button on the back.
I've never heard of a radio and rx losing their bind in flight.

I consider myself fortunate that I chose the Futaba 2.4Mhz system. I believe I have had it for over one year; four receivers, one transmitter, the six channel one. Not one problem and I fly much more than average. There was a quality scare about 4 months ago. My transmitter was tested and all was OK. Eliminating the possibility of accidentally "shooting" someone down is what drove me to make the change to 2.4Mhz. My clubs have always had excellent frequency control. With humans, accidents will happen. Even when we are very careful.

On Spektrum radios, the trainer switch is the bind switch. If you hold down the trainer switch and turn the transmitter on, then it will lose binding and you will have to bind it again.

You prolly had a reboot. From what I have read on the subject it works like this. The reciever needs a certian minimal voltage to run. If your voltage dips below that amount at anytime it will reboot the reciever. The original recievers would rescan all channels before locking on to your reciever and it would take 30+ sec for it to do this. The newer versions are suposed to default back to the last known channels in case of a reboot so it only takes like 5 or so sec to perform the reboot. I only use 6volt packs in my planes to try and give an aditional buffer to keep the 2.4 revievers properly powered. Remember when your flying and your servos are working they are pulling power and can droop the voltage your pack is putting out. This meens that even though it showed low but ok on the ground once the load gets put on it might drop to unsafe levels and cause a reboot in the air.

What?
That's wrong. The trainer switch is at the top left (by default) and is a sliding switch (rocker-type). The bind button is on the back, and is a button that is right in the middle of the radio. I own a DX7.

It is different on the DX6i. I just checked the manual for the DX7 and there is a bind button on the back, but on the DX6i, the trainer switch is used. I just assumed that all Spektrum radios were similar. Sorry about that.