Dear customers,

As Spektrum radio are more in use this day.
Our gear failsafe was original design for standard 35-72Mhz.
There is one function with our gear failsafe system will not on Spektrum.
When you turn on your radio and have gear switch in gear up position. This function will not going into failsafe to kept the gear down postion when the RX is turn on.
Please check your TX gear swicth before turn it on.

Meanwhile we try our best to modify the software to work with Spektrum system.
I'll post the progress as soon we had the result.

Whoever got the scrape to figure this one out.

Thanks!


Sean

Tam,

I know why the system does not work....I have done quite a bit of testing to figure out why (what can I say, I'm slow). Anyway, it has to do with the failsafe of the Spektrum receiver. When you "bind" your receiver for its failsafes, you usually bind it with the gear down, throttle at idle, and everything else neutral, blah blah blah. SO, what happens is, when the Spektrum receiver turns on, the first signal it sees is "failsafe" until a signal is received from the transmitter, which can take anywhere from 1-5 seconds (maybe more). Since the gearsafe senses a signal for gear down immediately, it thinks the trasmitter is already at gear down, so any following commands, it will obey without any questions. What that means is, if your trasmitter is in the GEAR UP position at turn on, the failsafe of the receiver will tell the gearsafe that the gear is set to down, but then as soon as the xmitter and receiver link up, it will immediately retract the gear.

Tam, a fix for this would be for the gearsafe to ignore any GEAR position chages for the first 15 seconds of being turned on. That way, the gear would be down during turn on, and the failsafe would ignore the gear up request after the xmitter and receiver link up. After the first 15 seconds, then you could operate as normal.

Just a thought.

Sounds like if you just don't set gear down as a failsafe position for Spektrum systems, there will be no problem. Just have the gear in the up position when binding so the receiver recognizes gear up as the faildafe position. When the receiver is turned on without the transmitter being on it will go to the failsafe up position which in turn Tam's gear failsafe should override the signal. This would be the same as if you turned on your 72 MHZ transmitter with the gear switch in the wrong position hence the gear will stay down until the Spektrum transmitter makes the link. In that case it should also function like a 72Mhz system and not allow the gear to retract until the switch is cycled to the down position and back to retract.
You just don't have the availability to have the gear coming out as an indication of radio failsafe, but then you will have the audible shutdown of the turbine.
At least I think it should work this way.....
Have to go try it out in the garage.
BC

BC,

Unfortunately that doesn't work either. What happens then is, as soon as you turn on the radio, it will start to retract the gears (because that is the "failsafe"), and then once the transmitter links up, it will try to extend them again......but of course your plane is already on the ground.

The spektrum pulse modulation works differently than our standard 72. With the current software, the up gear protection will not work on Spektrum systems. The good news is, that is just a value added feature, the real purpose of the gearsafe is to lower your gears in the event of low air pressure.

Double check your transmitter before turning on!!

Yep still working with the problem, even without the Tamjet unit connected if the gear position is selected up when bound, I have found that if you turn on the RX before the TX the gear retracts....not good on the ground. Works fine if the TX is on first though. But this way I know I am just bound to accidentally turn on the RX first. I haven't tried it with the gear failsafe intalled yet, its already too complicated.............your idea of a delay is good......if it could only know to delay until I remember to turn on the TX as well
BC

Problem solve........

No need to chance any software.
Here how it work with Spektrum set up.

After you finish ATV adjust your retract system.
Binding your reciever again with gear up postion.
Now turn it off and hook up the retract servo to the gear failsafe. Turn on Tx and Rx to start the program sequence as instruction showing you.

After you got everything done.

To test the gear fails safe. Turn on your TX with gear up position and turn your RX.
The gear failsafe should be in the failsafe mode not allowing gear to go up.
Once you put your gear swicth in down position. That will disable failsafe mode.
Give it a try.

Tam,

My Tamglish is a little weak on this one.

"After you finish ATV adjust your retract"

So are you setting the failsafe on the radio to gear-up?

That is right.
Bind your radio with gear up position.

The only problem with that is your gear will not come down if you get hit. It is usually a good visual indicator.

If you ever got hit with Spektrum.
Best visual you got is hundres of pieces every where on the ground.

word

New instruction manual update for gear failsafe device.
http://www.tamjets.com/gearfailsafe.php