Dodge Stealth 1994 - Noise Sometimes Appears on FM During Traveling

8-384
CHASSIS ELECTRICAL - Radio and Tape Plaver
1 A-8 1 Noise sometimes appears on FM during traveling.
No
Is the antenna completely extended?
Yes
Does the
problem
clear up when retuned?
OK
No
Does the problem appear o
locations and only with ce
No
Due to electrical field conditions.
(Multipath noise*, fading noise*).
No
Are connectors
properly connected?
Check connector connections.
i
Yes
:
.
Does noise appear when the radio switch is
turned on while the vehicle is stopped and the
radio is struck while tuned away from a station?
Yes
No
Static electricity noise:
> Body static electric from the shock
absorber 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 electricity
I
of the vehicle body.
Is the radio body correctly
(Is the mounting screw tightened securely?
)
Tighten the screw securely.
Yes
Is the antenna correctly grounded? (If noise
appears when the antenna is moved, this means
the ground is not securely connected.)
No
If rust is present on the antenna
b ground screw, clean and tighten
the ground securely.
Yes
Repair or replace radio.
* 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
effects 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-
tion and enters the receiver with a slight time
delay relative to the direct signal (repetitious
buzzing).
9 Fading noise
This is a buzzing noise that occurs when the
broadcast beam is disrupted by obstructing
objects and the signal strength fluctuates intri-
cately within a narrow range.
a