Hey I am using RKI-1197 2.4Ghz module with AT89c51 controller and i am connecting tx pin of controller with direct tx pin of module and rx pin of reciever module to direct rx pin of controller and still i am not getting desired o\p at reciever end which i am sending at transmitting end . Do i need any special coding for compatibility of 2.4Ghz module with controller or any special hardwere for configuration? Please reply ASAP , and Thanx in Advance.
RF modules are not all the same by any means - You need to study the documentation for the particular module that you are actually using.
If it states that Manchester (or any other) encoding is required - then that is what you must do!
"i don't know about that term perfectly"
It is a very long-established and widely-used technique - google it!
NB: if your module does require Manchester coding, then it does not make sense to be connecting it direct to a UART!!