When we used our Gemini2 a hitec receiver worked & a Cirrus receiver was reported to work (& a few others) but you had to use Sanwa crystals, the Tx in the handset & Rx crystal in the receiver (asif).
We were also advised that the battery in the handset/transmitter was of different polarity to earlier models - swap the wires, I don't know if that was true, we did not have that problem.
Can you find some other racers on 40Mhz and see how you go, where are you based ? new 2.4Ghz kit is not expensive.
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