After a period of monitoring, here are the details:
Frequencies - (Trunked) 451.975, 463.95
NXDG - 48
Random - 17
TGRP - 202
Also in DeKalb County, the Voluntary Action Center which provides Paratransit service in the county and limited fixed route service in DeKalb & Sycamore. Radio information is:
Frequencies - 158.2125/154.515 (I/O) DMR
Color: - 1
Slot - 1
TGRP - 1