Have you ever listened to Escambia???
Escambia County, Florida Fire Department dispatches about 20 different stations on a repeater frequency of 154.430. Then the individual stations will swith to a "Tac Channel".
The South End units will switch to 159.180 ( Tac 2) . The Northern Units in the county will switch to 155.820 (Tac 1) .
Then there is 155.145 known as Civil Defense or CD. The 155.145 can be used by all the fire departments. It is only activated when the tac channels get full. Then some of the individual fire department have their own frequencies to use as fireground so the Tac channel will not get full. All of the County Ambulances get dispatched on 462.975. LifeFlight can use All of the above frequencies plus more. Hope this helps. If I find more information I will post it on your web group or email you directly.
Albamma
That is wrong then and now... 154.430 is not and has not ever been a repeater! Have you ever even monitored the frequencies? South end never used a repeater other than "Med One" 155.025, until Brent VFD put up the 154.310 repeater, and still they used Civil Defense 155.145 (yet another simplex frequency), for fireground. Depending on location and how many incidents There is Tac-1 (a.k.a. Tac 1 North), 155.820 and Tac-2 (a.k.a. Tac-2 North) 159.0975, and that is it, other than simplex frequencies used by individual departments (with the exception of Pensacola Beach - Station 13 155.835 repeater which was, may still be on Tristan Towers Condos).
And Escambia EMS DOES NOT allow life flight on 462.975! NO Other Agency is on that frequency! They can use the "Med" channels to hospitals, and most of the VHF fire frequencies I just mentioned above. I do not know where you got your info, but from your spelling of what seems to be Alabama (Albamma) makes that enlightening and revealing!
And all of this is most likely about to change anyway, as Escambia County has decided to go to a digital system, with the ECSO encrypted... BUT, there is a software out there that you can make a dedicated PC decode ProVoice, etc.. so they have a false sense of "no one can hear us", just like FHP thinks, but are wrong!