I've been trying to sync up what I've been hearing when monitoring Georgia Tech with what I've read in this forum.Yup. AES-256.
Georgia Tech PD Dispatch is definitely TG 19350 on the City of Atlanta system, unencrypted. Just heard them dispatched to a car break-in at a student apartment complex on 14th street, and the responding GTPD unit sped past me a minute later on my way to work in midtown.I know Georgia Tech PD used to be on 853.3125 conventional P25 encrypted. Since they left that frequency I've regularly listened to them on talkgroup 19350 on the City of Atlanta P25 system (unencrypted Phase I FDMA). That talkgroup is listed in the RR database as GTPD's Channel 2, but it sure does sound like their regular dispatch channel, at least lately (I don't listen to them all that much).