They might have added a SCADA system. That will sound something like paging data bursts but depending on how its configured and how many sites are online it will still allow voice traffic over the same channel. Those systems are commonly licensed on an 11k2f3e modulation designator provided they are set to listen before transmit.
Or it could be that they are starting the process of switching their fleet of radios to 12.5 Khz bandwidth and the data bursts are intermod or a spurious signal that you hadnt noticed or recently came about.
Radioman
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Listening to OpenSky
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