Vector-LP Radio Beacon Transmitter Technical Instruction Manual Page 5-7
Section 5 Maintenance and Troubleshooting Issue 1.1
Table 5-1: Troubleshooting and Replacement Tips (Continued)
Front Panel
LED
Status
Message
Action
See Troubleshooting/
Replacement Paragraph
See Re-calibration
Paragraph
Output Network SWR Shutback RF power has been inhibited due to high reflected power. Check the RF path between the transmitter’s RF
output and the antenna system. If the instantaneous reflected power exceeds 80 W, the RF output is shut
back. The power level will automatically recover to its previous level. If two consecutive SWR shutbacks
occur within a two second period, the RF output is cut back (see SWR Cutback).
N/A N/A
Output Network Cutback Level
1-18
There are 18 steps (or cutback levels) available. The transmitter will continue decreasing or increasing the
RF output power until normal operating power is achieved, at which point the SWR alarm will disappear.
If two consecutive SWR shutbacks occur within a two second period, the transmitter enters the next highest
cutback level (1-18).
If the average peak reflected power exceeds 30 W (VR250) or 15 W (VR125), the transmitter enters the next
highest cutback level (1-18). When the reflected power level falls below 30 W (VR250) or 15 W (VR125), the
transmitter will enter the next lowest cutback level (1-18).
During a cutback, the System Diagram’s Output Network alarm lamp blinks and the Diagnostic Display
indicates the cutback level (1-18).
N/A N/A
Changeover Monitor Changeover Check the accompanying error message to determine the cause of the changeover.
N/A N/A
Changeover Monitor Shutdown Check the accompanying error message to determine the cause of the shutdown.
N/A N/A
External Alarm Ext Interlock Open An external interlock circuit is open. Check the integrity of the circuitry connected between terminals TB1-19
and TB1-20 of the remote interface PWB (A3).
N/A
N/A
External Alarm
Charger Alarm Check for battery charger failure.
N/A
N/A
External Alarm Low Battery Voltage The battery voltage is below the low voltage threshold. Check battery.
N/A N/A
External Alarm ATU Not Responding The associated ATU is not responding. Check connection between transmitter and ATU.
N/A N/A
External Alarm RCMI Not Responding
The NDB site interface PWB is not responding. Replace the NDB site interface PWB. N/A 4.3.5.1
4.3.5.3
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