That a good question. I just download the frequencies from radio reference to my SDS200 and scan.What TG DEC # do you have? I have noticed they like to switch back and forth between 1400 and 1500 for their primary dispatch channel. Listening to them on 1400 currently on control channel 774.66875. I have 1400 on hold with the Ops and 1500 all on Priority scan so it will key those up when it detects traffic.