Andrew Wireless Innovations Group RPT-MR701 用户手册
User’s manual for Repeater MR801B Power
M0067A0A.doc
Id.-No 151111
Page 24
02-JUNE-99
3.3 ALC
In order to protect the amplifiers from overload and to prevent the system to generate spurious
emission, the amplifiers 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.
emission, the amplifiers 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. 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.
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