I'm not aware of any around Knoxville since Knox county converted to TDMA LSM. The old 800MHz system at ORNL was superseded by a UHF P25 Phase II system as well.
Have no idea what's up with these two systems:
Knox County Schools Trunking System Profile
www.radioreference.com
Knox County Public Safety Back-up Trunking System Profile
www.radioreference.com
Just about everything in Knox county is on TACN.