See the LA County Wiki under "Collaborate" for unit IDs and more information.

Each sheriff's station has a Dispatch channel and a Local Tactical ('L-TAC') channel, each of which may be permanently shared with one or more other stations depending on the volume of station radio activity. Nearly all incidents and communications begin on a Dispatch channel (and then could switch to L-TAC / A-TAC / C-TAC or STAR-TAC).

NOTE: Mobile traffic is not rebroadcasted over the output frequency of the dispatch channels. Instead, only a beeping tone is broadcast to signify to the field units that someone is talking. To monitor units in the field you must program in the input frequencies also. The corresponding L-TAC channel is included in brackets.