Thanks for the replies. I've been listening pretty closely for the past week and I am pretty much on top pf Logan so I get great reception. It would seem that alarms are not dispatched over the air, which is a shame. It would be nice for Alerts, etc. It seems radio ops are on 592 after dispatch, but dispatch is in-station only, similar to Chicago Fire. Calls go over the air on 592 if units are out of the station. 592 seems to be simulcast on 453.900.
Fortunately, most calls do come over on state pd and Massport ops.
Scannergeek