hello im trying to scan salem county newjersey with the 500. i put the 3 cc's in but having trouble finding out how to put in the base frequencie, spacing, and offset. i have put this in the 996 and it scans fine, im hearing things. just dont see how to put these in the 500. ive tried with just the cc's and scan and i hear nothing. base is 493.0125, spacing 25.0. offset is 380 thanks in advance for youre help.