
31
Table B-1. Bias Tee 3 Troubleshooting Guide
SYMPTOM
PROBABLE CAUSE
SUGGESTED FIX
DC INPUT ON
but DC ON at
TCR-BT-01-1
(radio end) does
not illuminate
DC ON at
TCR-BT-01-2 (PA
end) does not
illuminate
TX LED at TCR-
BT-01-01 does not
illuminate when
the radio is keyed
Possible short on coaxial cable
between the two Bias Tees.
Possible open on coaxial cable
between the two Bias Tees.
This condition indicates that the
power amplifier is NOT
drawing any current. PA may be
either turned off or in a fault
condition i.e. wrong frequency
for mode selected on the PA.
Disconnect coaxial cable from
TCR-BT-01-01 and verify that DC ON
illuminates. Replace coaxial cable if
necessary.
Verify that the coaxial cable between
the two Bias Tees is good and properly
connected to the N connectors.
Replace coaxial cable if necessary.
Verify that the PA is turned ON and in
the proper mode of operation.