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CHASSIS ELECTRICAL - Radio and Tape Player
A-8
Noise sometimes appears on FM during traveling.
Is the antenna completely extended?
Does the problem clear up when re
Does the problem appear only in certain locations and only with yes
certain stations?
Are connectors property connected?
Does noise appear when the radio switch is turned on while the
vehicle is stopped
the radio is struck while tuned away from
a station?
Is the radio body correctly grounded?
(Is the mounting screw tightened securely? )
Is the antenna correctly grounded? (If noise appears when the antenna
is moved, this means the ground is not securely connected.)
About multipath noise and fading noise
Because the frequency of FM waves is extreme-
ly high, it is highly susceptible to effects from
geological formations and buildings. These ef-
fects disrupt the broadcast signal and obstruct
'reception in several ways.
l
Multipath noise
This describes the echo that occurs when the
broadcast signal is reflected by a large obstruc-
Yes
No
Yes
Yes
Revision
TSB
No
(Refer to E-l, 2.)
noise*, fading noise*).
Check connector connections.
No
rubber bushings used to prevent vibration, tires,
etc. occurs because of separation from the
ground, causing a buzzing noise.
Since no measures can be taken on the radio
side, steps should be taken to discharge the
static electricitv of the vehicle bodv.
No
If rust is present on the antenna ground screw,
clean and tighten the ground securely.
tion and enters the receiver with a slight time
delay relative to the direct signal (repetitious
buzzing).
Fading noise
l
This is a buzzing noise that occurs when the
broadcast beam is disrupted by obstructing ob-
jects and the signal strength fluctuates intricately
within a narrow range.
54-167
1
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