Tait TP9400, Руководство пользователя

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30 Getting started
About P25 digital radios
Your P25 digital radio can be programmed for P25
conventional or P25 trunked operation. Analog
conventional operation is also available, with dual-mode
channels able to receive both digital and analog calls.
You may notice differences between digital and analog
calls in terms of:
■
static noise in low signal areas, and
■
radio coverage in marginal reception areas.
Lack of static noise
On digital networks there is no static noise, even in low
signal areas. This lack of static is because your digital
radio removes the ‘noise’ from the call, so that you hear
only clear voice.
Coverage
With digital networks, a call remains clear and then
drops off quickly at the border of a coverage area. The
reason for this is that a digital call is either received or it
isn't. With analog networks, the background noise in a
call gets progressively worse when you are in fringe
areas or even slightly outside normal coverage areas.
P25 phase 2 digital operation
TM9400 radios are software upgradeable to P25
phase 2 operation. Contact your radio provider for more
information on software releases and P25 phase 2
availability for your radio.