Anybody know what i can do to be able to "tune" the frequency of my RF video receiver using my pic.

Basically i want to replace the knob so that i can control the receiver using a pic... what do i need to do this... it's for one of these wireless video recievers...

I have multiple cameras which are on slightly different frequencies.

I'd like to be able to "select" a camera from my software program, but need to know how to replace the knob so that i can tune using a pic.

Please let me know if you know