C-17 Transport

Hmmm... I didn't know old 3in1 could be a problem for this case... I missed it if it is written somewhere...

Problem is, even my "second version" 4in1 doesn't bind either. It is not from the first batch that had LNA problem, its from a newer batch without that problem, still doesn't bind.

From all the DEVOs i got, top let binds OK, it is the one with the seperate original NRF (even older than the 3in1, because that was the first DEVO i ever modified)
Top Right is the one with the 3in1. Only other difference it has with the top left one, is that it has a signal amplifier. No matter what mw i choose, it fails to bind, with or without active booster.
Bottom DEVO (the one i regularly use) has the 4in1, and also has a booster (that i can switch on or off, still doesn't bind no matter how many mw i use)

The one with the original NRF binds all the time, no matter the mw.

goebish wrote: This is known issue with xn297 @ 250kbps protocols, it is stated in several places in the forums, I know we should add a note about them in the manual.
There's no way to be sure to get a "good" module, that's just a matter of luck, seems separate nrf24l01+pa/lna works better but ymmv.
More technical info here: github.com/DeviationTX/deviation/pull/836

to make it shorter: when using 250 kbps bitrate, nrf24l01 is good at receiving xn297L packets (as seen in your captures with xn297 dump) but the xn297L (what is in your Rx and stock Tx) is not good at receiving packets sent by a nrf24l01+.

I see... I had read something like that on the forums but didn't understand that this was the case. Well, we can't have it all (in one tx at least)

But on the bright side, it does bind to the old DEVO i have. I can't understand why they keep changing protocols on such cheap products... They should embrace deviation to keep selling their stuff.

So, 250kbps protocols are no go for me now on.

I understand i was a bit unlucky this time, but since i can never know in advance if it will work or not, it is best not to buy. Those little toy grade txs are bad. I wasn't even tempted to fly the C-17 yet without it beeing flown by the DEVO.

One last question: Is it OK to keep version 75c17d5 installed on my DEVOs, or is it possible that i will have a problem? I suppose it is like any other new Nightly Build, or am i wrong?

Ok, thank you. And thank you all for the guiding and help with this model.

I flew this little plane today for the first time with the stock tx, and it is almost a miracle the way it flys with only two motor's differential thrust, no contol surfaces, and something that looks like a tx. I can only imagine what it would be like with the DEVO, with proper proportional control, and thust mixing with aileron.

Which leads to me ask one more question. Is there an even newer 4in1 module what uses a proper NRF chip? Or do we have to relay on older setups with individual RF chips, like the one i tryed and worked ok? If there is an even newer 4in1 i will purchase it. Thank you.

goebish wrote: In deviation you can also mix aileron with channel 5 (trims) for sharper turns, very useful in a gym.

To clarify this... There is a first version of 4in1, which had a Low Noise Amplifier problem. Then there was a second version, that fixed the LNA problem. So now there is a third version (which still is not quaranteed to work), or you are reffering to the second version?

goebish wrote: In deviation you can also mix aileron with channel 5 (trims) for sharper turns, very useful in a gym.

You can alo mix the elevator with throttle. So you basically set throttle to level flight and then adjust the altitude with the elevator like any other plane.
I flew last WE with the new protocol without an issue. The new board flis quite well. I haven't been able to do as tight turns as the old one but trims were not driven. I did not had the time to test it.

I can't wait!!! This is way way way beyond my understaning. Do your magic...

Sorry for my late reply. I installed the new build but it didn't work for me. I changed the frequency by steps of 20 at first and then steps of 10 from -127 to +127 but it didn't bind at any selection. After that, to make sure the plane was still in bind mode and nothing esle had happened, i used the tx it came with, and it completed the bind.

Do i have to turn the DEVO on and off after each selection? What i do, is choose the freq, then go up one menu, and hit re-init.