Maintenance and Troubleshooting ST94-21 C/Ku-Band TVRO
• Rotary Joint (Receive channel)
Verify continuity on the receive channel for its entire 360 degree range of motion.
Replace rotary joint if any sector of it has failed.
13.6.3.1.3. BDE/ADE No Response:
The Following possibly points of failures assumes LED illumination on both modems.
• Modem Configuration
Verify BDE modem and ADE modem are properly configured (jumper block settings).
• ACU to BDE modem interface cable failure
Verify harness continuity. Repair or replace as required
• ACU Antenna Port Failure
o Install an RS232 Loopback connector** on Antenna Port of the ACU. Enter
an “n0999” Remote Command and verify that it echoes back on the bottom
line of the display.
1. If loop back works, BDE Modem failure or ACU to BDE Interface
cable failure.
2. If loop back does not work, ACU failure.
13.6.3.1.4. ADE No Response 1: (assumes LED illumination on both
modems)
• Modem Configuration
Verify BDE modem and ADE modem are properly configured (jumper block settings).
o Install Spectrum Analyzer in line with the Rx IF coax path.
1. If 465.0MHz Transmit Beacon is present, the fault is the BDE
modem.
2. If 465.0MHz Transmit Beacon is NOT present fault is with the
ADE modem.
13.6.3.1.5. ADE No Response 2:
• ADE Modem Configuration
Verify the ADE modem is properly configured (jumper block settings).
• Coax Cable failure
Verify continuity on the items listed below, repair or replace as required.
o Base Modem to connector bracket (Base Rack Panel Assembly)
o (CFE) BDE to ADE Rx (LMR-400)
o Rx N to SMA Adapter (Connector bracket at Radome base)
o SMA to SMA connector bracket to bottom side rotary joint
o SMA to SMA top side rotary joint to PCU/ADE Modem
• Rotary Joint (Receive channel)
Verify continuity on the receive channel for its entire 360 degree range of motion.
Replace rotary joint if any sector of it has failed.
13.6.3.1.6. BDE Receive Or ADE Transmit (PED M&C):
• BDE Modem Rx Port Failure (Not receiving at 465.0MHz) or
• ADE Modem Tx Port Failure (Not transmitting at 465.0MHz)
o Install Spectrum Analyzer in line with the Rx IF coax path.
1. If 465.0MHz Transmit Beacon is present, the fault is the BDE
modem.
2. If 465.0MHz Transmit Beacon is NOT present fault is with the
ADE modem.
13.6.3.1.7. BDE Transmit or ADE Receive (PED M&C):
• BDE Modem Tx Port Failure (Not transmitting at 452.5MHz) or
EAR Controlled - ECCN EAR99
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