Two way radio comunication

Want to make two modules boards for two way radio communication with PIC.

I am looking Nigel Wireless Board for guide line.

my first board will have radio modules
1. RF transmitter
2. RF receiver

Second board will also be the same with a receiver and transmitter.

Now i want to ask,
sppose i have two boards, both with Receiver and Transmiter, Named A and B.

I am sending data from the transmitter of Board A the receiver of B board will receive the data but A board receiver will also receive the data.

Now how can i getred of this situation???

Common radio modules now a day???

my poor english hope u understand.

You have to transmit at seperate times, so you need a well defined plan for it to work, with handshaking - a lot depends on the exact use though.

You might try looking at amateur radio packet techniques.

In a half duplex system only 1 can transmit at a time. As mentioned above you need to have software to enforce this.

In a full duplex system both can transmit at the same time.
To do a full duplex system you need to have 2 frequencies. A sends to B on one frequency B talks to A on the other.

HTH