It appears there are two trunked public safety systems in Davidson County - click on each to review it in detail:
Nashville/Davidson County Public Safety
- look under "Mode"
- A = analog (you can pick this up)
- D = digital (you cannot pick this up on a PRO-90)
Goodlettsville Public Safety
The Goodlettsville system is Motorola Type II Smartnet and you're PRO-90 will pick it up.
However, the Nashville/Davidson Co system is Motorola Type II SmartZone. It is capable of both analog and digital - and if you take a look at the system, you'll see that the vast majority of talk groups are digital. You're PRO-90 cannot handle digital.
So before you go through much trouble trying to program it to receive the Nashville/Davidson Co system, you should make sure that you're going to be able to hear what you want to hear.
Mike