User's Manual Part 5

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The T2008 Power Supply is a mains operated power supply designed to provide the DC
supply requirements of the T2000 Series II radios. It uses switch mode technology to
control the regulation of the output voltage, which results in a power supply with a
higher temperature rating, improved efficiency and greater reliability.
The power supply can either be operated with the radio sitting on top as a desk top unit,
or with the radio and power supply detached as two separate units (refer to Section
8.1.5, “Installation”).
The T2008 has protection circuits for overcurrent, overtemperature and overvoltage pro-
tection circuitry. Current limiting is included to restrict the peak current to about 9.5A.
In addition, a self-restoring thermal shutdown keeps the temperature of the switching
transistor within the ‘safe operation area ratings’. The point of thermal shutdown is also
dependant on the load current, to allow for a higher duty cycle rating at lower output
currents. The output voltage and thermal shutdown points are factory preset.
The power supply also has a limited capability to float charge a lead acid battery under
constant voltage conditions (refer to Section 8.1.5, “Installation”).