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Thanks for the info from everyone. Range isn't that important, though I am somewhat giving into temptation of how cheap these modules are. I will look at the OR gate as I get my head around all this. Where it stands now, I have a very reliable solution (well, it has not lost any wireless...

Here is the complete operating circuit at the PC which appears to work 100%. A third picaxe circuit is fully standalone with both RX and TX modules wired up very similar to the picaxe on the right in this diagram but without the connecting diode back to the PC serial IN line. Thus, the code is...

Ok, here are the circuit diagrams for both serial comms and programming. It states the same as I stated above - there is a problem (as pointed out) with the RX data line sharing the pin with the PC data out line. I now have this working 100% reliably by transmitting to a separate circuit...

I've got a dorji DRA886RX connected to a picaxe 08M2, and in turn connected to a PC. The PC will be issuing commands via the serial port and will be receiving commands back from the dorji. Once rigged up I'll have different wireless modules with sensors etc. working, but baby steps first...