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ACCESSORIES
9-33
5. AM reception is restricted to a shorter range, thus,
work, or antenna replacement is completed.
eliminating unwanted distant station interference in the
evening hours
-
AM signals are transmitted and received
I. Turn radio switch on, and set band selector to AM.
vertically and the verticle portion of the conductive element
2. Use manual antenna switch and extend mast to full
serves as the AM reception antenna. It is comparable to an
up position when a car is equipped with power antenna.
external antenna extended to a height of approximately 18".
3. Tune in a weak station at approximately 1400
6. The antenna does not deteriorate with age.
Kilohertz on the AM band and turn volume control to
TESTING: The antenna can easily be checked using
maximum.
tester J 23520 and following procedure in Fig. 9-38.
4. Adiust antenna trimmer, located behind right control
ON-CAR SERVICE
MINOR ADJUSTMENTS
Antenna Trimmer Adjustment
knob ring,-for maximum volume. Access to antenna trimmer
is gained by removing right control knob, spring and control
ring. Use a standard 1.8" long screwdriver to adjust the
screw.
NOTE: If during adjustment, the station becomes strong
so that a change in volume cannot be heard with further
screw rotating, tune to a weaker station and continue the
NOTE: If antenna is not trimmed, the set will have weak
adjustment.
and fading AM reception. Antenna trimming should
always be performed after any radio or antenna repair
Place radio t o A M band just off
a station and turn volume up full.
See note 1.
Hold tester J-23520 t o antenna be-
ginning at upper corner of antenna.
See note 2.
-
Shrill sound heard thru radio when
ard thru one o r both
both antenna wires are tested.
antenna wires.
ANTENNA IS O K A Y .
I
I
I
Adjust radio antenna trimmer.
See orocedure.
I
Proceed t o move tester along the wire
toward center of the windshield and
down toward the radio.
I
exact location where shrill sound
I
begins, this is the area o f the
defect.
I
entire length o f antenna, unplug
antenna pigtail from antenna
lead-in cable. Touch tester
t o center conductor of lead-in.
antenna lead at radio and touch tester
t o center conductor o f antenna
socket i n the radio. See note 3.
replace defective antenna
is okay and radio, speaker o r fuse
IS
defective.
Note 1. A M & F M radio must be tuned t o the A M band.
Note 2. The shield band must be on the tester at all times t o
direct the signals only t o the area desired.
Note 3. I t may be necessary t o remove the cold air duct t o
provide access t o antenna socket.
Note 4. Check tester on a known good car t o make sure
it
is operating
properly and that the battery is n o t weak or dead.
Shrill sound is heard, replace
pigtail per instructions i n
251 4
Fig. 9-38 Windshield Antenna Diagnosis
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