Hi,

>Could anyone please tell me somthing about usimg  a PIC to make a radio
>transmitter around 25-30 MHz operate in  1000 m range. As I see the
>maximum frequency which they can operate is 20MHz.
>
>Many thanks in advance
>
>Jagath

Check RF Monolitics at: http://www.rfm.com

You'll find some useful documents there explaining the tricks of wireless
communications. Worth to read.

They run a line of products called Virtual Wire. You can get solutions from
single component to complete PCB and development Kit.

Transmitters can work in the 433MHz band (Europe) or 900MHz (USA/Canada) and
data rates go up to 19.2kbps.


Luis Fernandez Cormenzana
RadioBit Sistemas, S.L.
        Vehicle fleet control systems
        Patrol presence controllers

Fax/Tel:+34-6-585 64 57
        +34-6-680 26 33
e-mail: radiobit@dragonet.es
http://www.dragonet.es/users/radiobit