JRC NDR-91 User Manual

No.
Control
Function
t6 LOCK
switch
Used for
locking
the set frequency
electrically
so
as not
to
be
changed
by
careless misoperation.
By setting
this
switch
to the locked
condition
(pressed),
the
receiving
frequency
will
not
be changed
even
though operating
the TUNE
knob
@
and UP/DOWN
switch
@
.
f'or
releasing
the locked
condition,
press
this
switch
again.
l1
AF GAIN
knob
This is
a
volume
adjustment
knob for
the speaker
or
headphones.
And this
knob
does
not
af'fect the level
of
the
line
output
(600O
balanced) on
the
rear
panel
of
the
receiver.
t8
Attenuator
switch Used for
selecting
the
ON
or
OFF
condition
of the 20
dB
HF
attenuator for
the receiver
input.
Set this
switch
to ON
for
the
better reception
when
the signal is received
at the
near distance
and the desired
signal is interfered
due
to
the
strong neighboring
signals
etc.
But usually,
set this
switch
to the OFF
position.
t9
AGC
switch
Used for
selecting
the
ON or
OFF condition
of the
AGC
circuit
and selecting
the discharging
time
constant.
The FAST
position
is
for
the reception
of DSB
signals,
and the
SLOIV
position
is normally
f
or
the reception
of
CW or
SSB
signal
affected
by
fading.
By setting
this switch
to OFF,
the
AGC circuit
remains
inoperative
and signals
are saturated.
Thus,
control
the
gain
by
the RF GAIN
knob
@
for
the best
receiving
condition.
20
BC BAND
REJECTOR
Set this switch
to
ON
for
the
better reception
when
the
cross-modulation
or
intermodulation
due
to the strong
radio
wave
of the
broadcasting
wave
(525
to 1605
kHz)
interferes
the MHF
reception.
2l POWER
switch
Used for
turning
ON or
OFF the
power.
Also used for
selecting
AC or DC
power
supply.
4.2 OPERATING
PROCEDURES
Before turning
on the
power
switch,
check the following items.
(
I
)
Power
voltage check
The
label, which shows the nominal
power
voltage,
is
placed
above the
power
connector
located on the
rear
panel
of
the receiver.
Check
that the
power
voltage
to be
used
is
within the
range of the nominal
value
!lO%.
(2)
Antenna
system check
Check that each connecting
part
of the
antenna cable to
be connected
to
this
receiver
is
firmly
connected. When the antenna
coupler
and antenna
changer are used,
check that
they are correctly
set
*-t2-

JRC NDR-91 Specifications

General

Brand	JRC
Model	NDR-91
Category	Receiver
Language	English