Ok ... So according to my contact at OEM ...
"The Somerset County UHF trunking system
is currently operating in two different modes. All
fire and rescue departments still operate on
wide band/analog since the FCC gave a waiver
last summer for operations in the T band which
is above 470 mhz and where we operate. Some
of the County functions (such as Sheriff and Prosectuor)
have switched over to the narrowbanded digital platform,
and new law enforcement agencies which migrate
to the TRS will probably follow suit. Most available
trunking scanners should be able to handle both
of these systems.
TDMA is a new technology which meets the spirt
6.25 khz bandwidth (half of the normal narrowband).
I don't see TDMA on UHF in Somerset County anytime
in the near very future. We are however starting to prepare
some migratiion of new users to 700mhz and that could
well be 6.25 bandwidth using TDMA within two
years, however I don't see fire and ems using
that platform for the foreseable future."