in band signalling

Whenever I go through Rocklin I tune to their Dispatch frequency and along with MDC1200 I sometimes hear what sounds like a two-tone signal on keyup and sometimes on de-key. I have heard something similar to it on CHP's Valley Division-wide UHF frequencies but I am not sure what it is. I have...

I am trying to "get smart" on the tones Adams County, Pennsylvania uses for fire dispatch. I know that the Quick Call II style tones are for the pagers; with a "B" group tone assigned to each station, allowing 1+1 for ambulances, officers, fire police, etc. I am good with the concept, but does...