Geely CK Series 2007 Workshop Manual page 229

(2) Multipath transfer
Noise caused by bouncing of radio waves off
obstructions is called "multipath transfer".
Multipath transfer occurs when a signal from
the broadcast transmitter antenna reflects off
buildings and mountains and interferes with
the signal that is received directly.
(3) Fade out
Because FM radio waves are of higher frequen-
cies than AM radio waves, they are reflected
off buildings, mountains, and other obstructions.
For this reason, FM signals often seem to gradu-
ally disappear or fade away as the vehicle goes
behind a building or other obstructions. This is
called "fade out".
4. Noise faults
For noise troubleshooting it is very important to understand the feedback information from the customers
well, so make the best use of the following questionnaire and diagnose the fault accurately.
Operating condition when
Radio Wave
Noise occurs at a specific
place.
AM
Noise occurs when listening
to faint broadcasting.
Noise occurs only at night.
FM
Noise occurs while driving
and at a specific place.
HINT:
In the case that the noise occurrence condition does not meet any of the above, check based on the "Recep-
222
noise occurs
Strong possibility of foreign noise.
There is a case that the same program is broadcasted from
each local station and that may be the case you are listening
to different station if the program is the same.
Strong possibility of the interference from far distant
broadcasting.
Strong possibility of multipath transfer interference and
caused by the changes of FM waves.
Multipath
Transfer
Fade out
Cause