just read this if you want to learn about simulcast systems

you might have to out your thinking cap on

http://forums.radioreference.com/greater-los-angeles-inland-areas-discussion/317878-laso-simulcast.html

The Los Angeles Sheriff uses essentially the same system as the county
FD - regional or local synchronized simulcast channels, and some
countywide synchronized simulcast channels

the only difference between Sheriff and Fd is that Sheriff uses
multicast (key up different freqs at same time) - that has more to do
with channel loading, dispatcher availability, and operational
procedures

note - in this thread - the poster says "simulcast" but I say
"synchronized simulcast"

note - some people think that multicast means to key up 2 or more
freqs at the same time - maybe it does - i dont remember the exact
functions on the Motorola consoles - they have "multicast" and and
maybe "multiselect" and maybe "patch" options - sometimes just the
dispatcher goes out on 2 or more freqs - sometimes the cars go out on
2 or more freqs also

Bottom line - "synchronized simulcast" is transmitting from 2 bases or
2 repeaters at the same time on the same freq in the same area with
the same message - you gotta do the fancy synchronizing or everyone
just hears garbage (in the middle between the 2 radio sites)

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