16
Table 2-5. Troubleshooting Guide
SYMPTOM
PROBABLE CAUSE
SUGGESTED FIX
XMT light ON in
conjunction with
FLT light flashing
when transmitting
LVL light flashes
slow (2 Hz)
LVL light flashes
fast (5 Hz)
Low output
power
Incorrect operating frequency for
selected mode.
Or
RF source is sweeping (not fixed
frequency)
Input RF is too low.
Or
DC input voltage is too low for
normal operation (typically 13.5
VDC for commercial vehicle
operation and 22-28 VDC for
military vehicle operation).
Input RF is too high.
Low input voltage or low RF
drive level. Low battery voltage.
Change mode or frequency for proper
operation.
Do not use a swept source
Increase input RF power until LVL
LED is off.
Increase DC input voltage to the
proper level corresponding to the DC
input power selected on the power
connector.
Verify that the proper DC power cable
is being used.
Decrease input RF power to less than
10 Watts.
Check DC voltage while transmitting
and radio output power setting. Note:
The LVL LED will not flash to
indicate a low drive condition when
operating from a battery (low battery
voltage) even though the output power
may be low.
FLT light flashes
Constantly,
output power is
reduced.
FLT light ON,
Radio connected
to LOS port.
WB light does not
illuminate.
PA has exceeded its normal
operating temperature limit.
PA has exceeded its high
temperature limit and is in
“failsafe” mode – the equivalent
of LOS Bypass.
Option 11000-00744 not
installed.
Provide additional airflow or reduce
transmission time. The PA
automatically reduces output power
under high temperature conditions.
Operation will return to normal and
the FLT light will extinguish once the
PA reaches normal operating
temperature.
Verify that option 11000-00744 has
been purchased and/or the upgrade has
been performed.