Ac/Dc Power Distribution - Base Radio; Power Supply Battery Charger; Figure 14: Ac And Dc Power Distribution In The Gtr 8000 Base Radio - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 2: GTR 8000 Base Radio Theory of Operation
NOTICE: If the power supply module is used for the Power Efficiency Package, the power
supply fan does not run below a 40 °C air inlet temperature in DC mode with the transmitter in a
de-keyed state.
2.1.4.1
AC/DC Power Distribution – Base Radio

Figure 14: AC and DC Power Distribution in the GTR 8000 Base Radio

If present, the base radio operates from AC power as the preferred power source. When AC power is
not available, the base radio switches to operate from the DC source. Operation returns to the AC
source when the AC source is restored. Switchover from AC to DC and back again is fully automatic.
The Main DC output of the power supply is used to provide power to the power amplifier and the
transceiver. The Auxiliary output of the power supply is not used within the base radio, but is reserved
for use as a redundant power input to other site components such as the site controller.
2.1.4.2

Power Supply Battery Charger

The power supply may include an integrated battery charger. The battery charger is controlled through
software residing on the associated device module. Software contains the information on supported
battery types and obtains user-specific information pertaining to the particular site. The device software
receives battery bus voltage and battery temperature information from the power supply, and uses
these variables with supported battery charging profiles to return a signal which sets the charger output
voltage appropriately. The battery charge and temperature conditions are viewed through
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