You want to use the Zone 1 site for Fire and EMS. Frequencies are 853.5875, 853.7875, 853.8125, and 853.8375. Talkgroups you would be interested in follow:
237 North Fire Dispatch
239 South Fire Dispatch
241 North EMS Dispatch
235 Central EMS Dispatch
243 South EMS Dispatch
The Fire Tac talkgroups are all encrypted and cannot be monitored.
Double click on the Zone and Knob Positions you are using. Set the Receiving Mode to Trunking TG-Scan. If set to Trunking TG-Monitor, you will hear everything on the system. Using Trunking TG-Scan, you will receive only the talkgroups you programmed.