Want to build a RF circuit

I want to built a RF transmitter and a reciever to transmit digital signal, anyone can help me? (the circuit should be small and low cost)

Why don't you people learn to ask questions properly?

- What frequency?
- What distance?
- Whyt kind of digital signal?
- What purpose?

- What frequency? <== 100Mhz to 1000Mhz
- What distance? <== 10-20m
- Whyt kind of digital signal? <==+5v to 0v
- What purpose? <== transmit the output signal from ADC(SERIAL )

I want the RF circuit small , and reliable. what can I do?

THX:)

What country?

you can use idea of car alarm system.
it is use about 300-350MHz and 400-450MHz frequency range.
check these links, it may help you:
http://www.linxtechnologies.com/inde...alnet_txm433lc
http://www.maplin.co.uk/Module.aspx?...Ryan&U=MapAuto

and check this IC:
http://pdfserv.maxim-ic.com/en/ds/MAX7030.pdf

Regards,
Davood Amerion.