I believe the Expert radios haven't been made in a LONG time.... If that radio is as old as ithink it has to be, it would need to be verified to be narrow band modified, and the batteries should be checked to be certain they are still good. (Batteries won't be good if they are the originals and the radio as over 10 yrs old as I expect it to be. First replacement set would be about due to go bad already.)

If the old system needs batteries, and modificatio to meet current FCC regulations... it would be cheaper to buy a new system. If its still functional, good batteries and has the gold sticker, there's no problem using it. I'm using a 14 year old Futaba system that's been Narrow band modified. (The old Futaba is about to be retired though... TX case is falling apart.)