Nautel GV60, Troubleshooting Manual

Page: 45 / 477

GV60 TROUBLESHOOTING MANUAL RESPONDING TO ALARMS
VERSION 1.0 2018-01-01 PAGE 4.1.37
 If an RF power module has one or more defective PAs, as indicated by the AUI's Module Status
screen (and suspect RF power module's front panel LEDs), but is still contributing to the
transmitter's RF output, it may be left on. The transmitter will take necessary precautions to
reduce the stress on components due to the failure, i.e., power reduction.
 If an RF power module must be removed, turn it off prior to disengaging its blind-mating
connectors. Refer to
“RF Power Module Replacement” on page 4.1.44 to disable a module with
the transmitter on air. At all other times, turn off the switching power supplies by pressing the
RF Off button, then switch off the ac power source at the service entrance.
NOTE
: There are many possible combinations of PA/module failures or extractions. The best and worst
case situations are shown in Table 4.1.2 on page 4.1.37 .
 When maintenance is complete and it is safe to return the transmitter to normal service,
enable all RF power module supplies by setting the switch on the front of the associated RF
power module(s) to its ‘
ENABLE
(up)’ position.
Table 4.1.2: Output Power Level vs. PA/Module Failure/Removal
* Limited by maximum allowable Reject Load Power in RF module (500W) or Final Reject Load (1500W).
PA/Module Failures/Removal
RF Output Power
(% of original RF output power)
Best Case Worst Case
1 RF Power Module 92 92
2 RF Power Modules 84 *42
1 RF Power Amplifier 98 98
2 RF Power Amplifiers 96 *64
3 RF Power Amplifiers 94 *63
4 RF Power Amplifiers 92 *61
5 RF Power Amplifiers 90 *60
6 RF Power Amplifiers 88 *59
1 Power Supply Module 96 96
2 Power Supply Modules 92 92