Antenna System Test - Hummer H1 Service Manual

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STEP ACTION
1 Disconnect negative battery cable.
Disconnect antenna lead-in cable at the
radio receiver.
With a DVOM, measure resistance
between the coax (outer conductor) con-
nector and the negative battery cable.
NOTE: To avoid misdiagnosis be sure
to zero the meter before taking measure-
ments.
Is resistance value greater than.15 ohms?
2 Grasp the antenna mast.
While observing the DVOM, wiggle the
antenna and the lead-in cable ground
strap. Does the meter indicate intermit-
tent continuity?
3 With a DVOM, measure the resistance
between the radio coax lead-in connector
(center conductor) and the antenna mast.
NOTE: To avoid misdiagnosis be sure
to zero the meter before taking measure-
ments.
Does the measured resistance equal ap-
proximately the value listed?
4 While observing the DVOM, wiggle the
antenna. Does the meter indicate inter-
mittent continuity?
05745159

ANTENNA SYSTEM TEST

CHART #7
VALUE(S)
> .15 ohms Check the base of the
antenna for a good connec-
tion to body ground.
Check the coaxial cable
interconnects for a poor
connection or corrosion.
Check the ground connec-
tion from the battery nega-
tive cable to the body.
Repair the antenna ground
circuit as necessary.
Check the lead-in cable
ground strap for a good
connection to body ground.
Check the coaxial cable
interconnects for a poor
connection or corrosion.
Check the ground connec-
tion from the battery nega-
tive cable to the body.
Repair the antenna ground
circuit as necessary.
Less than
3.5 ohms
Check the coaxial cable
interconnects for a poor
connection or corrosion.
Repair/replace the antenna
coaxial circuit as necessary.
Electrical System
YES
Go to step 4. Check the coaxial cable
interconnects for a poor con-
nection or corrosion.
Repair/replace the antenna
coaxial circuit as necessary.
See troubleshooting hints
for noise and poor reception.
12-157
NO
Go to step 2.
Go to step 3.
4-1-00