very low power and small size FM transmitter for digi.data

[nikhilele]

I want to send signals from my robots to the other robots and mains station so i need many transmitters and reciever,
I cannot use 433Mhz module as they are costly.

can any one suggest me some schematics and ideas to send digital data through Fm transmitter and decode it at reciever.

I think I am talking about FSK.

I want to make my things simple so that a undergraduate can understand easily.
Thanks for your repl

 

[david90]

u can get RF tx+rx for as cheap as $10 bucks for both.

Try ebay and type in "RF module"

How many do u need anyway?

 

[nikhilele]

more cheap is to use FM transmitter using 2-3 transistor and FM reciever using single IC