i had design a rf system to control a servo motor , problem is when rf transmitter and receiver is working, my pic has a erratic performance, so i believe my pcb pic is working as an anthena, i got my pic conected to ht12d an the pic controls servo signal
if a run the system using sensor instead ht12d the pic is working fine, but system become unstable when rf system works
isolate the pic signals from the radio board by high speed Opto couplers. let the power supplies for the two sections be different.
Have a decoupling capacitor and a series choke in the Vcc lineof the PIC supply.
try to shield the rf parts of your projct in a metal or aluminium casing.