Yeh, think crystals are correct, Tx in the transmitter RX in the receiver.
Thanks for the link I'll look into it, I have tried every combination of reciever ports, and then thought I'd try them the other way round which led to smoke on the first attempt so gave up thinking id fried one of my receivers, but I'll give the link a read.
Worst comes to worst I've got a new transmitter and reciever on the way but would be good to get it working
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