about rf channel

Hello All

I need to know more about walkie talkie and how the frequency range
work.
Let'say a walkie talkie with frequency range work from 2400 to 2500 Mhz wHile the IF is 5 Mhz
So how will the channels be allocated for trasmitting and receiving if it is a single duplex type?

Can anyone enlighthen please
Any helpful link or ducment is appreciated
Thanks a lot in advance

rgds and thanks
jason