Removal and replacement of ADU modules
8-20
Chapter 8: Service & maintenance
98-133966-G1
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.
• Detection of temperature and power level from the Ortho Mode
Transducer (OMT).
• Decoding the HALL-sensor input from the Zero Reference
Module (ZRM).
• Decoding the input from the Optical Rotation Encoder (ORE).
11.Polarisation motor.
12.Polarisation encoder (not visible on photo).
13.Block Up Converter (BUC). (behind cable screen, not visible on
photo)
The BUC converts the L-band (950 to 1700 MHz) Intermediate
Frequency (IF) up to Ku-band (13.75-14.50 GHz (extended)) radio
signal, and amplifies it to transmit power level. It receives transmit
signal and power from VIM.
Figure 8-18: PMM – Block diagram
'LJLWDO
&RQWURO
)LOWHUSRZHU
/'2V
0
(QFRGHU
'ULYHUV
6HQVH
DPSOLILHU
VQVBL
IDQBRQ
9
9
0&8
9
9
300
7HPSVHQV
6WHS0RWRU'ULYHU
3RZHU
'HWHFW
'ULYHU
9PRWRU
SZUBGHWHFW
)$1
9BVHQVH
3RODULVDWLRQ0RWRU0RGXOH
$,/2596$7$'877 $
9B207
JQG
JQG
9
JQG
=HUR
UHI
9
JQG
9PRWRU
969P
6WDWXV
/('V
/('
7HPSVHQV
3RZHU
'HWHFW
207
/'2
9B207
]HURBLQ
9B=50
25(B$
25(B%
WHPSBGHWHFW
9PRWRUVHQVH
9VHQVH
9B207VHQVH
$&'HWHF
9PRWRU
IDQBUXQ
56
6%XV
JQG
6%XV
6XE'
6XE'
$GGU
6HULDO
$GGU
SAILOR900TM.book Page 20 Monday, September 16, 2013 11:01 AM
Summary of Contents for Sailor 900 VSAT
Page 2: ...98 138976 A Cover_SAILOR 900 VSAT System_407090B indd 2 15 04 2013 15 54 39 ...
Page 28: ...List of tables xxvi 98 133966 G1 SAILOR900TM book Page xxvi Monday September 16 2013 11 01 AM ...
Page 257: ...Appendices SAILOR900TM book Page 1 Monday September 16 2013 11 01 AM ...
Page 258: ...SAILOR900TM book Page 2 Monday September 16 2013 11 01 AM ...
Page 355: ...98 138976 A Cover_SAILOR 900 VSAT System_407090B indd 3 15 04 2013 15 54 40 ...