Sac Metro, Cosumnes, and Folsom Fire use the Alpha.
Sac City Fire uses the Bravo.
The "B" channels are for Sacramento City Fire. Sac County uses the "A", "C", "D", and "T" (training) channels.
While not wrong...
Below is the general rule of thumb for assigning extra groups for the departments:
Groups A and C are for the County.
Groups B and D are for the City.
T is a shared Training group.
Example... When there is a special event in the County's area, they are usually assigned a C channel.
Special Events in the city usually get a D channel.
This is just a rule of thumb.
Also...as for who created the channel alpha tags (for FIRE) in the new P25 System....I would like to see where you got your information for that, or if you just felt the need to make your own "cool" channel labels. They should be the same "alpha tag" as in the Analog system.