JRC NDR-91 User Manual

S
and the
line output
when
set to
tÏNtrI.
The MHz
knob
is
used
for
setting
the l0 MHz
and I
MHz
digits
bf tne receiving
frequency.
The MHz digit
information
is
sent
out in
BCD
code from
this
switch
and this
output is
set to l0
MHz
and I
MHz digits
of
the up/down
counter.
The
lTÙNEl
knob
is
provided
for
setting
the
receiving
frequency
in 100
Hz
steps.
This knob
is
connected
to
the
circuit so
called rotary
encoder
or
pulse
generator
which
generates
50
pulses
for
one
full
"
rotation.
Pulse
doubler
circuit makes
this 50
pulses
double electrically,
so that
100
pulses
are
generated
for
one full
turn.
These
pulses
are connected
to the
100
Hz
digit
of the
up/down
counter. Therefore, for
the f-ull
turn
of this knob,
100
(pulses)
x
100
Hz,
so that
full rotation
can
vary
up
to
l0
kHz.
rumOWNl
switch is
provided
for
fast forward
for
the receiving
frequency.
By
setting
this
switch
to
fq,
the up/down
counter
operates
as the up counter.
And
the
multivibrator
output
is connected
to the 100
Hz digit
of
the counter,
thus
the
receiving
frequency
is
increased.
By
setting this
switch
to
I
DOWN
l,
the
counter operates
as the
down
counter
and
the receiving
frequency
is
decreased.
The frequency
increasing
or
decreasing
speed
by the
|ÙFDOWNI
switch is
set to appro x.
125
kHzlsecond.
The
lLôôKl
switch is
provided
for
locking
the set receiving frequency
so
as
not to
be
changed
by
careless misoperation.
When
this
switch is
set to
ON
(pushed
condition),
the
pulse
output
from
the
fTUtUelknob
and
multi-vibrator
output
generated
by the
IUPDOWNI
switch
are
prohibited
to be applied
to
the
counter. Therefore,
the
ITUNE
I
knob
and
rumôWNl
switch
will not operate.
The
FjMMEEI
knob is
provided
for
controlling the
brightness
of LED
by changing
the
power
voltage
applied to
LED on
the front
panel (frequency
indicator,
mode
and
band
width
indicators).
5.4
POWER
SUPPLY
SECTION
The
power
supply
section
converts
the external
AC
power
or DC
power
to
+17V,
+l5V
and
+5V
DC required
in each
circuit
and
+5V
for
dimmer.
+l7V
is
used in
the analogue
circuit
and
+5V
in the
logic
circuit.
+15V
is
a special
power
for
audio
power
arnp
(AF
AMP.) IC.
+5V
for
dimmer,
which
is controlled
by the
lDlMfvtEnl
knob
on
the
fiont
panel,
changes within
the range
from
approx. 0 to
+5V.
-
l8
-

JRC NDR-91 Specifications

General

Brand	JRC
Model	NDR-91
Category	Receiver
Language	English