While doing some exploring with my RTL SDR I came across a P25 control channel on 853.1875. (A quick FCC search shows the Alachua County Sheriff's Office does have a license for this frequency WPTC649) I found this to be interesting since currently the county uses a Motorola type II SmartZone system. Gainesville / Alachua County Trunking System, Gainesville, Florida - Scanner Frequencies
For kicks I ran a copy of unitrunker on the newly discovered frequency to see what was going on. The system consists of 3 frequencies (at least that I was able to log):
853.1875 P25 Control Ch
852.2750 Alt Control Ch
852.1875 Voice Ch
While monitoring unitrunker I parked my PSR500 on the voice ch for a little while to see what if any voice traffic was being sent across the system.
The CWID is transmitted every 30 min across the Voice Ch. When decoded it reads “CHANGEME” Interesting....
From what I could see and hear they system was simulcasting ACSO and GPD primary talkgroups. Not full time, and there was some other traffic that unitrunker had listed as encrypted. Im going to listen to the system more and try and map out the talkgroups.
Im trying to figure out what this system is set up for. Why does it have simulcasted talkgroups from the main system? At this point my best guest is that this might be setup to allow for interoperability. However with the FIN system and 8TAC/CALL it doesn't seem all that necessary. Perhaps its an experiment in P25... Something the folks over at GRU are playing around with.
Anyone have any thoughts or insight on this system?
For kicks I ran a copy of unitrunker on the newly discovered frequency to see what was going on. The system consists of 3 frequencies (at least that I was able to log):
853.1875 P25 Control Ch
852.2750 Alt Control Ch
852.1875 Voice Ch
While monitoring unitrunker I parked my PSR500 on the voice ch for a little while to see what if any voice traffic was being sent across the system.
The CWID is transmitted every 30 min across the Voice Ch. When decoded it reads “CHANGEME” Interesting....
From what I could see and hear they system was simulcasting ACSO and GPD primary talkgroups. Not full time, and there was some other traffic that unitrunker had listed as encrypted. Im going to listen to the system more and try and map out the talkgroups.
Im trying to figure out what this system is set up for. Why does it have simulcasted talkgroups from the main system? At this point my best guest is that this might be setup to allow for interoperability. However with the FIN system and 8TAC/CALL it doesn't seem all that necessary. Perhaps its an experiment in P25... Something the folks over at GRU are playing around with.
Anyone have any thoughts or insight on this system?