Table of Contents
12.4. AZIMUTH & ELEVATION DRIVE ................................................................................................................................................................ 12-1
12.5. FOUR QUADRANT TRACKING TEST .......................................................................................................................................................... 12-1
12.6. BLOCKAGE SIMULATION TEST .................................................................................................................................................................. 12-2
13. MAINTENANCE AND TROUBLESHOOTING ........................................................................................................................... 13-1
13.1. WARRANTY INFORMATION ....................................................................................................................................................................... 13-1
13.2. RECOMMENDED PREVENTIVE MAINTENANCE ....................................................................................................................................... 13-1
13.2.1. Check ACU Parameters ....................................................................................................................................................... 13-1
13.2.2. Latitude/Longitude Auto-Update check ..................................................................................................................... 13-1
13.2.3. Heading Following ................................................................................................................................................................. 13-1
13.2.4. Azimuth & Elevation Drive ................................................................................................................................................. 13-2
13.2.5. Test Tracking ............................................................................................................................................................................ 13-2
13.2.6. Visual Inspection - Radome & Pedestal ................................................................................................................... 13-2
13.2.7. Mechanical Checks ................................................................................................................................................................ 13-2
13.2.8. Check Balance .......................................................................................................................................................................... 13-2
13.2.9. Observe Antenna Initialization ....................................................................................................................................... 13-2
13.3. 400MHZ MODEM CONFIGURATION ..................................................................................................................................................... 13-3
13.4. 400 MHZ LED INDICATORS .................................................................................................................................................................... 13-4
13.5. 400 MHZ MODEM SIGNALS .................................................................................................................................................................... 13-4
13.5.1. Pedestal M&C ........................................................................................................................................................................... 13-4
13.5.2. Radio M&C ................................................................................................................................................................................. 13-5
13.5.3. Channel Identification ........................................................................................................................................................ 13-5
13.6. TROUBLESHOOTING 400MHZ MODEM COMMUNICATION FAULTS ............................................................................................... 13-6
13.6.1. 400MHz Modem Queries: .................................................................................................................................................. 13-6
13.6.2. Modem Query Methods ..................................................................................................................................................... 13-6
13.6.3. Isolating a 400 MHz Modem Fault Procedure: ...................................................................................................... 13-8
13.7. TROUBLESHOOTING ................................................................................................................................................................................. 13-11
13.7.1. Theory Of Stabilization Operation .............................................................................................................................. 13-11
13.7.2. ST-21 Series Dual C-Band OR Quad Ku-Band TVRO RF Flow ..................................................................... 13-11
13.7.3. Antenna Initialization (ST-21 Series) ......................................................................................................................... 13-12
13.7.4. Troubleshooting using DacRemP ................................................................................................................................ 13-13
13.7.5. Antenna Loop Error Monitoring ................................................................................................................................... 13-14
13.7.6. Reference Sensor Monitoring ........................................................................................................................................ 13-15
13.7.7. Open Loop Rate Sensor Monitoring ........................................................................................................................... 13-16
13.7.8. Open Loop Motor Test ...................................................................................................................................................... 13-17
13.7.9. To Disable/Enable DishScan® ....................................................................................................................................... 13-18
13.7.10. Satellite Reference Mode ................................................................................................................................................. 13-18
13.7.11. To Read/Decode an ACU Error Code 0008 (Pedestal Function Error): ................................................... 13-18
13.7.12. Remote GPS LAT/LON Position: .................................................................................................................................... 13-21
13.8. MAINTENANCE ......................................................................................................................................................................................... 13-22
13.8.1. Balancing the Antenna ...................................................................................................................................................... 13-22
13.8.2. To Adjust Tilt: .......................................................................................................................................................................... 13-23
13.8.3. To Reset/Reinitialize the Antenna: .............................................................................................................................. 13-24
13.9. PEDESTAL CONTROL UNIT CONFIGURATION - STXXX-21 SERIES ............................................................................................... 13-25
13.9.1. To configure the PCU; ........................................................................................................................................................ 13-25
13.9.2. MODEL CONFIGURATION NUMBERS ...................................................................................................................... 13-25
13.10. ANTENNA STOWING PROCEDURE ......................................................................................................................................................... 13-26
14. ST94-21 TECHNICAL SPECIFICATIONS .................................................................................................................................. 14-1
14.1. 9497 ANTENNA REFLECTOR .................................................................................................................................................................... 14-1
EAR Controlled - ECCN EAR99
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