PC connection, that's one of the problems, I don't have an ftdi interface or want to buy theirs at £25 as it's at my cost.

I tried direct 9pin max232 connection but I don't get a response except echo back.

I'm also completely puzzled as to why I can't hear anything except a low dull pulse on my UHF sdr receiver when in test mode. It's supposed to be a higher power version rf module. I should see and hear the pulses at 868.3 mhz.

Yet I can pick up my signal generator strongly which is 100 times less output!

Every now and then I get a good visual signal with high strength but it's not consistent.

I will have to abandon the RSSI output and just go to the base use for the modules. It needs to be boxed and out by early next week.

Rob