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FM ANTENNA INFORMATION
TIPS FOR SAFE OPERATION
For
the
best FM sound
quality ,
it is
necessary to
install an
appropriate type of antenna
,
taking into
consideration the
signal
strength
of the
broadcasting
station and the
surrounding
conditions
.
Place for installation
:
For safe
operation and satisfactory performance
of this unit
,
keep
the following in mind when
selecting
a place for its
installation :
•
Shelter it from direct
sunlight and keep
it
away
from
any
source
of intense
heat
.
•
Avoid
dusty
or
humid
places
.
•
Avoid
places
where there is not
enough
ventilation for proper
heat
dissipation
.
•
Install it on a
steady support
.
When
handling the power cord :
•
Do
not handle the power cord with wet hands
.
•
Do not
pull
on
the power cord when disconnecting if from
an
AC wall outlet
,
Grasp
it
at
the
plug
.
Avoiding
electric shocks and fire hazards :
If , by accident
,
water is
spilled
on
the unit
,
unplug the power
cord
immediately and take
the unit
to a FISHER
authorized
service center for
servicing
.
Wet insulation
may
cause electric
shocks and can be a fire hazard
.
Do not drop pieces of metal
into the unit
:
Needles , coins and other
electrically conductive
materials
may
cause
trouble if
they get
into
the unit
.
Cleaning :
Wipe the front panel and other exterior surfaces of the unit with
a soft
,
dry
cloth
.
Stains should be
removed
by wiping the surfaces
with a soft
cloth immersed
in lukewarm water and wrung
dry
.
Never use a solvent or alcohol
.
Do not
spray
insecticide
liquid
near
the unit
.
Such
chemicals
may
cause
surface
discoloration
and
cracking
.
1
.
Selection
of an
FM Antenna
1
.
In areas near FM
stations
:
When FM programs
are
to be
received
from nearby
broadcast
-
ing
stations
,
or when there is no
significant noise
interference
from
motor vehicles ,
use an indoor FM T
-
anfenna
.
NOTE
:
Every antenna has a directional characteristic
(
its
sensitivity
varies
according to
its
position )
.
Spread the T - section
of
the FM antenna
.
Move it around in
order to determine the best signal
-
receiving position and then
install
it
.
2
.
In areas
relatively
near FM stations :
If the indoor FM T -
antenna fails to
eliminate noise
completely
or
if
you
wish to pick up
signals
from distant stations
,
install an
outdoor
antenna
.
NOTE :
Generally
,
the sensitivity
of an FM outdoor antenna corre
-
sponds to the number of
its elements
.
This should
be
,
the
criterion for
the selection
of
an
FM antenna
.
3
.
Directional characteristics of FM outdoor
antennas
:
An increase in the number of elements not
only improves
the
sensitivity of the outdoor FM antenna but also enhances
its
directional characteristics
.
This means that such an
antenna
has to
be
positioned
accurately for
the best
reception of
a
particular FM broadcast station
.
2
.
3
.
4
.
5
.
Multipath Phenomenon
A
nearby
mountain or a high
-
rise
building
reflects FM radio waves
,
which interfere
with the
waves
coming
in
directly
.
Noise and sound
distortion caused
by
this is known as
multipath
interference
.
This
problem can be
remedied
by taking advantage
of the directional
characteristic of an FM antenna and
by using
an antenna rotor
.
General Remarks on FM Antennas for Outdoor Installation
Keep the following
in
mind when installing an FM antenna outdoors :
1
.
Install the
antenna away from road traffic and place
it as
high
as
possible
.
2
.
Determine
the antenna position
in relation to
nearby buildings
and
trees
.
3
.
Keep the antenna away from high
-
tension power lines
.
9
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