im planing to build dtmf generator and decoder..i want the tones from generator to be transfered via wireless (rf)..towards decoder...wat module should i use as the tones are analog signals....
What do you think a phone or a baby monitor does? The signal from a microphone is an analog signal, the suggestion was to REMOVE the mic and feed in your signal instead, with whatever scaling/conditioning is required.
If you really want to build a radio transmitter and receiver from scratch, then feel free, we're just suggesting easy ways that you may be able to do it using existing, very cheap devices.