Andrew Wireless Innovations Group RPT-MOR701 User Manual
User’s manual for Remote Unit MOR701B Power
M0069A0A.doc
Id.-No 151154
Page 26
23-June-99
3.3 ALC
In order to protect the final amplifier and the optical devices from overload and to prevent the
system to generate spurious emission, the amplifier for the DL Out and the Active Combiner
for the UL Out have an Automatic Level Control, designed to limit the output power to a
defined level. A part of the output power is rectified, amplified and used to control an
attenuator network. In order to avoid oscillation, the control amplifier has an integrating
characteristic, so that a step function response obtains a delayed rise and decay.
system to generate spurious emission, the amplifier for the DL Out and the Active Combiner
for the UL Out have an Automatic Level Control, designed to limit the output power to a
defined level. A part of the output power is rectified, amplified and used to control an
attenuator network. In order to avoid oscillation, the control amplifier has an integrating
characteristic, so that a step function response obtains a delayed rise and decay.
F
Note:
The ALC protects the final amplifier and the optical devices. To keep
spurious emissions below certain limits, the input power into the Repeater
and the attenuation settings of the Repeater have to be considered
properly.
spurious emissions below certain limits, the input power into the Repeater
and the attenuation settings of the Repeater have to be considered
properly.
3.4 BITE and alarms
The Built-In TEst concept comprises the monitoring of the power supplies, the operational
currents in the RF modules, the mother board and the remote control interface. Furthermore,
the synthesizer lock and the temperature of the Repeater are monitored.
currents in the RF modules, the mother board and the remote control interface. Furthermore,
the synthesizer lock and the temperature of the Repeater are monitored.
There are three multicoloured LEDs mounted on the control module. The LED L3 indicates
the presence of electrical power of +12VDC in the Repeater. Every alarm is indicated by the
failure LEDs, L1 and L2.
the presence of electrical power of +12VDC in the Repeater. Every alarm is indicated by the
failure LEDs, L1 and L2.
Position of the LEDs on the control module is shown in the following figure.
figure 3-2 Position of failure LEDs