Removal and replacement of ADU modules
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Chapter 8: Service & maintenance
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5. Zero Reference Module (x3, 2 in the previous figure, 1 in the next
figure) (ZRM) (not visible on photo).
In order to be able to find the predefined zero point of the
antenna direction, HALL sensors and corresponding magnets
mount in the gearwheels. Due to the magnetic hysteresis
behaviour of the hall sensor, the software will have to make the
magnets pass the hall sensor in both directions, and when use
the mean value as the zero point.
The ZRM features two LEDs; one for indication of power supply,
and one for indication of zero point.
6. DC-Motor Driver Module for elevation (on the bottom side)
(DDM).
As in item 3 above.
7. Elevation motor and encoder (not visible on photo).
8. Low Noise Block downconverter (LNB) (not visible on photo).
The LNB down-converter receives the Ku-band radio signal
(10.70- 12.75 GHz), which will be amplified and converted down
to a stacked L-band IF (950 - 5450 MHz). The conversion is
controlled by a DiSEqC-programmable Local Oscillator in the LNB
to obtain maximum flexibility in a global perspective where
several different LO's are used.
The Ku-band interface is a WR75 waveguide and the IF interface
is a 75 Ohm F connector. It has DC-power, and a DiSEqC control
signal is delivered via the IF cable. The L-band output is
delivered to the TIM.
9. Polarisation motor.
10. Polarisation Motor Module (PMM).
The PMM shall - based on inputs from the PCM - control the
angle position of the Polarization Mechanism Assembly (PMA).
The PMM board is:
• Communication slave of the ADU Bus also connecting the DC-
motor Driver Modules (DDM), the Inertial Sensor Module
(ISM) and the Pedestal Control Module (PCM).
• Driving a stepper motor, with micro stepping capability.
• Motor Filter which filters electrical noise and minimizes
acoustic noise.
• Decoding the HALL-sensor input from the Zero Reference
Module (ZRM).
• Decoding the input from the Optical Rotation Encoder (ORE).
11. Inertial Sensor Module (ISM).
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