Eachine CG023 protocols - what are they?

ok, I probably missed something ... I'll try myself on the 3D X4 before asking others to test

I've no idea, but that's strange that this issue only exists with the YD, not the CG023 or 3D X4.
Maybe the issue is with the RX, first the antenna length was not good (24 mm instead of 31 !) and perhaps they are using a crap oscillator on the xn297 or something like that ?

Looks like the issue only happens with higher power outputs ?

Ok, did some tests with :

- 1 JXD JD-388 (nRF24L01, V202 protocol)
- 1 WLToys V272 (nRF24L01, V202 protocol)
- 1 blue board CX10 (XN297, CX10-A protocol)
- 1 EAchine 3D X4 (XN297, CG023 protocol)



And 3 DIY nRF24L01 PPM modules:
(I'm using a Duemilanove in the picture above because I'm running out of pro mini )



#1: simple $0.99 nRF24L01 breakout board (ebay)
#2: nRF24L01+PA+LNA w/ IPX connector from banggood (most commonly used in Devos ?)
#3: nRF24L01+PA+LNA w/ SMA connector from ebay

I'm using maximum RF power on all modules ( firmware ).

Results:

module #1 (no PA+LNA) is working perfectly with all 4 aircrafts
module #2 (PA+LNA, IPX) is working perfectly with JD-388 and V272, not so well with 3D X4 and CX10, there's a ton of hiccups and/or delays, it's almost unflyable !!! Sounds like it is the same behavior you have !
module #3: same as #2

Conclusion:

There's an issue with XN297 emulation, but only at higher power outputs.

victzh, if you're reading, perhaps you've an explanation ?

I'm coming back on what I said, the hiccups and delays with the PA+LNA modules were because I was powering everything from my crappy USB, the problem is gone if I power up everything from a good battery ... (but that's still strange I only had issues with xn297 aircrafts, not nrf24l01 ones, maybe the xn297 chip requires a "cleaner" rf signal ?)

So, maybe the idea of replacing the 3.3V reg for a better one is still a good idea to try ...

No, this protocol is TX only, and it looks like the issue is only with the YD-829.