Maintenance Guide Part 4

NeTIS MAINTENANCE GUIDE – Version 1.1 139/139
11.10 Power amplifier (PA)
This module amplifiers the RF signals sent by the CPU module in order to deliver 10 Watts
RF.
It is powered by +28 volts and can be checked on the front face of the UCM2. The PA alarms
are present on the front face of the UCM2. The PA provides a set point for the regulation of
its output power.
The amplifier has an internal blocking mechanism if it does not receive the transmission
command from the UCM. No measurements can be made if the BS is not in TETRA
transmission.
The module has an integrated circulator which protects it from accidental load disconnections
and considerably minimises the risks of intermodulation with neighbouring transmitters.