MJX Protocol?

www.deviationtx.com/forum/protocol-devel...or-protocol-requests

looking at images of the receiver, the transceiver chip appears to be on a daughter board soldered underneath the main rx board. That is annoying because it makes it hard to see which chips are being used, and this is the 1st thing I'd need to know. If you want to open the transmitter and take pictures of the inside, it could help identify which chips are being used.

It looks like I could pick up a receiver and tx for ~$40 US, which isn't too bad, but if it only supports 1 model, it may not really be worth it. It will probably depend on which chips are being used.

The Rx by itself isn't particularly useful for protocol development. need a rx and tx pair usually.

the important one is actually the one underneath the black circle (the silicon is mounted right on the board, without a package). Assuming they went for cost savings, it is likely an oem board that they use rather than designing their own RF board. The problem is it makes it harder to identify which chip is in use

The rfx2402c on the same board is the power-amp.

Can you see if there are any numbers on the crystal on the rf board (the silver oval). Knowing the frequency may help identify which transceiver is being used.
My guess is it is an nrf24l01, but there's really no data backing that up at the moment.

that etched wire on the rx is the antenna.

well, the cyrf6936 uses a 12MHz crystal, the CC2500 uses a 26MHz crystal.
The nrf24l01 uses a 16MHz crystal. the cc2520 uses a 32MHz crystal. The A7105 can use 8, 12, 16, 20, 24 MHZ crystals
So that leaves us with the nrf24L01, the A7105, or some other unknown chip.

The A7105 is used in Flysky equipment, and is not a very big player. The NRF24L01 is very popular with RC equipment.

In either case, to use it with Deviation, you'll need to add a new module. You can look at the Flysky to Devo pdf to get an idea of the procedure (though that is only the hardware part. We still need to know the protocol.

I haven't yet put an nrf24L01 module in my tx, though it is a part of my protocol-analysis test rig.

If you're still interested, I may consider ordering an rx and tx. $40 isn't a bad deal, and the transmitter module itself is easily worth $10 with its nice 23dB power-amp

FYI, I ordered a Tx and Rx board. For $34US, seems like a good deal. I probably won't have time to work on this anytime soon, but then it'll likely take a month to get here...