Could you be more specific? Are you saying the the 0-5V UART output from the max232 is not suitable? In that case, what does the datasheet mean when it says the module can handle CMOS/TTL input?
As for the Manchester encoding, is this something I should just do in software in, say, a uC, or do I need separate specialised encoders/decoders? Sorry if these are stupidly basic questions...
What kind of voltage signal should it be once Manchester encoded, and what makes it more usable by a radio module than a standard UART (or, why is this UNsuitable?) I'm really very new to the radio electronics thing...
Thanks!