TM 11-6625-2398-15-2
Symptoms
Probable trouble
Correction
a. Improper connections
a. Check that connections to
1. Excessive RF sum channel
insertion loss.
2A1HY1J1, 2A1HY1J2 and the
connections of 2A1W1 are
secure. Tighten loose connections
or replace defective connectors.
b. Defective cable 2A1W1 or hybrid
b. Check difference channel insertion
coupler 2A1HY1.
loss. If the sum channel and
difference channel insertion
losses are both excessive, check
cable from 2A1W5J1 to
2A1HY1J1 (para. 4-12). If cable
is not at fault, replace hybrid
coupler 2A1HY1 and recalibrate
(refer to TB 11-6625-2398-35).
If only the sum channel has an
excessive loss, replace cable
2A1W1 and recalibrate (refer to
TB 11-6625-2398-35).
a. Improper connections.
a. Check that all connections to
2. Excessive RF difference channel
insertion loss.
2A1W6J5 and 2A1J1 are made,
and are secure. Tighten loose
connections and replace defective
connectors.
b. Defective cables, attenuator, or
b. Check sum channel insertion loss.
hybrid coupler 2A1HY1.
If sum channel and difference
channel insertion losses are both
excessive, check cable from
2A1W5J1 to 2A1HY1J1 (para 4-12).
If cable is not at fault,
replace hybrid coupler 2A1HY1
and recalibrate (refer to TB 11-
6625-2398-351. If only the
difference channel has an ex-
cessive loss, check cable 2A1W3,
cable 2A1W2 (para 4-12).
attenuator 2A1AT1, and the
cables from 2A1W4J4 and
2A1W6J5 to attenuator
2A1AT1. Replace defective parts
and recalibrate (refer to TB 11-
6625-2398-35).
a. Improper connections.
a. Check all connections between the
3. Excessive VSWR.
input showing excessive VSWR
and the termination(s). Tighten
loose connections, replace
defective connectors and
recalibrate (refer to TB 11-6625-
2398-35).
b. Defective parts.
Check cables 2A1W1, 2A1W2,
hybrid coupler 2A1HY1, cable
2A1W3 and the cables from
2A1W5J1, 2A1W4J4 and
2A1W6J5 (para 4-12). Replace
defective parts and recalibrate
(refer to TB 11-6625-2398-35).
6-10
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