Advantech SSPB-3000C, Installation And Operation Manual, Page: 11 / 55

SSBP-3000C
Page 10
3. MAJOR COMPONENTS AND THEIR FUNCTION
This Section describes the major components and their functions within the SSPB unit. The SSPB
incorporates an L-Band to C-Band Up-Converter module, a Power Amplifier module, a
Waveguide Arm assembly, a 10 MHz oscillator, a Main Controller board, a Power supply
subsystem, a Current Sensor, a Cooling system and a Front Panel assembly. The remote
monitoring and control of all major parameters is possible via the RS-232 and RS-485 interfaces.
3.1 L-BAND TO C-BAND UP-CONVERTER MODULE
The
L/C-Band Up-Converter Module converts and amplifies the incoming L-Band signals into
the desired C-Band carrier signals.
The module has an internal synthesiser, which is fixed at 4900 MHz.
To control the output power level of the converter, an attenuator is used to provide the system gain
control.
The Up-Converter module has RS-485 communication to the Main Controller board. An additional
discrete signal is available at this module: the Alarm Up-Converter (output).
3.2 POWER AMPLIFIER MODULE
The
Power Amplifier Module amplifies the RF C-Band signals from the L/C-Band Up-Converter
module over the frequency range of 5.850 GHz to 6.425 GHz. The power amplifier has a 60 dB
typical gain.
For monitoring, the power amplifier has an RS-485 interface, which connects to the main
controller board. Two additional discrete signals are available at this module: the Alarm PA
(output) and the Mute PA (input) for muting the Power Amplifier.
A temperature sensor is installed at the hot spot of the module to monitor the temperature. When
the hot spot temperature e85 ºC, a shutdown command is issued by the controller of the
module, in order to prevent the damage of the RF devices due to overheating.
The controller of the Power Amplifier also has the following functions:
1. Provides and removes the DC voltages to the GaAs FET devices within the module.
2. Sends a FAULT signal to the main controller board when detecting a fault.
The Power Amplifier will be in Mute mode if:
1. The Main Controller board sends a MUTE command to the PA module.
2. The hotspot temperature exceeds 85
°
C,