AOR AR2000 - Receiver Controls and Interface; Aerial Connector and Volume;Power Control; Squelch, Attenuator, and Tuning Controls

AR2000 Operating manual Page 3
ea
le
Controls
The
receiver
is
housed
in
an
attractive,
strong
plastic
cabinet.
Controls
for
operation
are
located
on
the
top
and
front
faces
of
the
cabinet.
1.
Aerial
connector.
This
is
a
standard
BNC
type.
It’s
operation
is
like
a
bayonet
(push
and
twist)
and
is
mounted
on
the
top
face
of
the
cabinet.
The
supplied
portable
aerial
may
be
connected
to
this
point
or
a
mobile
/
base.
2.
VOL
&
POWER
(volume)
control.
This
is
the
inner
knob
of
the
dual
concentric
rotary
controls
located
on
the
top
face
of
the
cabinet.
It
is
used
to
set
the
required
audio
output
from
the
receiver.
When
turned
fully
clockwise
the
volume
is
at
maximum,
when
rotated
anti-clockwise
the
volume
is
reduced
to
a
minimum.
At
the
fully
anti-clockwise
position
the
power
ON/OFF
switch
is
activated.
3.
SQL
(squelch)
control.
This
is
the
outer
knob
of
the
dual
concentric
rotary
controls
located
on
the
top
face
of
the
cabinet.
The
control
is
used
to
eliminate
unwanted
background
noise
on
unoccupied
frequencies.
It
is
also
used
by
the
receiver
to
decide
when
to
stop
during
scan
and
search
modes.
The
squelch
control
needs
careful
setting
to
achieve
optimum
operating
performance.
Rotate
the
control
clockwise
until
the
background
noise
just
disappears,
this
is
the
most
sensitive
setting
of
the
control.
In
practice
the
control
is
usually
rotated
a
little
further
clockwise
to
avoid
6
df
a]
stopping on noise or very weak and , Fi |
unreadable signals. If the control is rotated ’ i
too far clockwise then weak signals will be
totally lost and only strong signals will be
heard.
4. ATT (attenuator) switch. The switch
has two positions marked as LOCAL and
DX. For most situations the DX or long
distance position is used where the receiver
is at its most sensitive.
When operating the receiver in the presence
of strong signals such as those from TV,
broadcast, taxi, police etcetera, some interference may be experienced. This interference can take
many forms such as an increase in background noise, desensitising of the receiver or mixing of
many stations together. The cure for most of these effects is to use the attenuator switch in the
LOCAL
position.
This
reduces
the
level
of
signals
reaching
the
receivers
circuitry
and
helps
the
set
cope with strong signals.
The addition of the attenuator switch to the receiver allows the set to be sensitive when required for
weak signal listening and provide a reduction in overloading when necessary.
5. UP/DOWN (tuning) control. Located on the top face of the cabinet, this rotary control allows
‘manual tuning of frequencies displayed on the receiver. The control has a convenient click
operation, the tuning increment can be programmed from the front panel keypad.
6. EAR (earphone or external speaker) socket. Located on the top face of the cabinet. This is a
standard
3.5mm
mono
jack
socket.
Either
an
earphone
or
small
external
speaker
may
be
connected,
when in use the internal speaker is automatically disconnected. The impedance of an external device
should be 8 OHMS or greater.
©1991 AOR Lid.