Advantech SSPB-3000C, Инструкция по установке и эксплуатации, Страница: 12 / 55

SSBP-3000C
Page 11
3. Any of the GaAs FET devices fails (current is out of range)
3.3 WAVEGUIDE ARM ASSEMBLY
The
Waveguide Arm Assembly contains a forward power detector, a reverse power detector, a
RF isolator, an output power coupler, and a waveguide band-pass filter.
The forward power detector and the reverse power detector monitor the RF output power and the
reflected power level and sends these detected signals to a Digital Power Monitor module, that
converts these analogue signals into digital ones. The digital signals are sent to the Main
Controller board via an RS-485 serial interface.
The RF isolator provides VSWR protection at the SSPB RF output port. The VSWR at the isolator
output is 1.25:1, minimum. The termination load of the isolator is capable of absorbing full
reflective power. A CPR-137 grooved waveguide flange is the output of the unit.
3.4 10 MHZ OSCILLATOR
This circuit is used to generate a 10 MHz reference signal with a high stability of 3 x 10
-8
typical,
which is required by the Up-Converter module. The 10 MHz signal is provided to the Up-
Converter module via a coaxial cable.
3.5 MAIN CONTROLLER BOARD
The
Main Controller Board contains a microprocessor controller that performs all of monitoring
and the control, input/output communication and the decision-making. The main controller board
provides:
1. Fault detection and indication from each part of the unit
2. Mute control and indication
3. Forward RF power detection and indication
4. Reflected power detection and indication
5. Power On indication (front panel LED)
6. Redundancy control (1:1 redundant system)
7. Frequency control
8. Unit gain control (attenuation setting).
9. Discrete Interface, RS-232 and RS-485 Serial Interfaces