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You can also store stations manually on the
AS storage locations (see 'Storing a Radio
Station into a Preset' elsewhere in this
handbook).
Recalling Stored Stations
Select waveband AM or FM with the button
AM/FM 9.
Press the desired preset button.
To select one of the stations stored with
Auto-Store, select waveband AM or FM,
then briefly press AS button 8 and press
the desired preset button.
Radio Reception
Due to varying reception locations, car
radios have performance limitations that
may on occasions create the impression
that your radio is malfunctioning. To assist
you in understanding what can be expected
from your radio, we have set out below how
reception may vary from time to time and
under certain conditions.
AM and FM:
There are two types of radio broadcasts in
Australia. AM or Amplitude Modulation in
which the amplitude of the signal is varied to
produce the sound and FM or Frequency
Modulation in which the frequency is varied
to produce the sound.
Range:
AM broadcasts tend to follow the earth's
curvature and also reflect from the upper
atmosphere, in which enables long range
reception, especially after sunset.
FM transmissions are basically line-of-sight
(similar to TV signals) and are reflected by
buildings, mountains etc., but not by the
upper atmosphere.
Interference:
Interference is caused by either natural or
man made electrical disturbances. This can
affect the amplitude of the signal being
received. AM signals are more prone to this
type of interference than FM signals. This
type of interference has little or no effect on
the frequency of the received signal, thus
AM is susceptible to interference from power
lines, fluorescent lighting, neon signs, traffic
light control circuits, overhead tram wires
and electrical storms. With FM reception,
these amplitude variations are filtered out,
leaving a relatively clear signal (refer to
'Peculiarities of FM Mobile Reception),
making this one of the major advantages of
FM broadcasts.
Peculiarities of FM Mobile
Reception:
A mobile FM radio cannot be expected to
continously provide the quality of FM
reception you may have experienced on
your home radio. Contrary to popular
opinion, FM broadcasts are not static free,
and although your new radio has a built-in
electronic interference absorption circuit,
some static will be evident from time to time,
especially in areas without a direct line of
sight to the transmitter.
Your radio is also equipped with a soft mute
function. The purpose of this is to attenuate
the treble and audio level in weak signal
areas to reduce the very annoying
background hiss, which is customary to
weaker FM reception. There are two pheno-
mena peculiar to FM reception.
• Flutter - As FM signals reflect off solid
objects, it is possible to pass through
areas of 'SHADOW' caused by tall
buildings and/or hilly terrain, which
effectively blocks out the signal. As the
car passes in and out of shadow areas,
the level of signal will vary at a rapid rate,
creating a flutter type of interference to
the signal.
• Distortion (Multipath) - Distortion
may occur when the direct signal from the
transmitter and a reflected signal reach
the antenna at the same time and either
cancel or aid each other, like ghosting on
a TV. This results in intermittent distortion
of the signal whilst moving or constant
distortion when stationary, such as at a
traffic light or when parked. Should this
distortion occur while stationary, moving
the car approximately 1 or 2 metres
would on most occasions correct the
problem. Circuitry has also been included
in this radio to reduce this type of
distortion.