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Icom IC-701 User Manual

Icom IC-701
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6-3-8
RIT
ON/OFF
CONTROL
CIRCUIT
Q9
and
Q17
make
up
the
RIT
ON/OFF
control
circuit.
The
voltage
of
the
RIT
IC
terminal
of
J6
is
fed
to
the
emitter
of
Q17
through
R51.
The
terminal
is
0
Volts
when
the
RIT
is
ON
and
5
Volts
when
it
is
OFF.
Q17
prevents
the
reverse
flow
from
the
base
of
Q9.
The
collector
of
Q9
is
fed
voltage
from
the
RIT
control
and
shunt
to
ground
when
the
RIT
is
OFF.
6-4
DRIVER
UNIT
6-4-1
FREQUENCY
DISPLAY
1C1-1C6
are
the
7
segment
LED
indicators
for
the
frequency
1MHz
DIGITS
DISPLAY
SCHEMATIC
DIAGRAM
10MHz
-
5V 5V
ae
ANODE
a
sas
ANODE
|
TARTS
|
TARTS
TRANSISTOR
ARRAY
“
laa]
7[[ailze|a]
=
[>
[e
[ele
|e
1MHz
DIGIT
display.
1IC3-IC6
are
driven
by
IC22-IC25.
The
input
for
the
drivers
is
taken
from
the
BCD
output
of
1C1,
AO-D3
in
the
PLL.
IC1
and
IC2
are
driven
by
1C16
and
IC17.
The
input
of
each
band
is
decoded
by
!C14
and
IC15
and
D21-D35
to
indicate
the
MHz
and
10MHz
digits.
6-4-2
PHOTO-CHOPPER
CIRCUIT
D38
and
D39
are
infrared
LED
diodes
and
Q1
and
Q2
are
the
photo
transistors.
D38
sends
a
continuous
light
source
to
Q1
and
D39
sends
it
to
Q2.
Between
the
diodes
and
the
transistors
is
a
windowed
chopper
disk
which
is
connected
directly
to
the
shaft
of
the
tuning
knob.
The
diodes
and
photo
transistors
are
set
up
so
that
the
phase
difference
of
90
degrees
results
when
the
disc
revolves.
The
signal
from
Qi
and
Q2
is
fed
to
IC1
on
the
driver
unit.
Pin
3
of
IC71
is
connected
to
the
data
input
pin
(Pin
5)
of
flip-flop
1C3.
The
output
from
Pin
4
is
divided,
and
fed
to
Pins
5
and
6
of
IC2.
One
is
fed
directly
and
the
other
is
fed
through
a
delay
circuit.
[C2
is
an
exclusive
OR
gate
IC,
and
both
pulses
of
the
positive
edge
and
the
negative
edge
are
added
to
Pin
3
of
IC3
and
O
output
is
added
to
IC3’s
reset
terminal
through
the
delay
circuit
so
IC3
operates
as
a
monostable
multivibrator.
QO
is
fed
to
Pin
8
of
IC2,
the
1C17
03.5
O7
O14
iC14
is
switched
ON
in
28MHz
band.
OA4
The
segments
“dp”
and
‘’c”’
of
1MHz
digit
are
turned
on
in
any
band.
memes
intel
stash
Sia
atta
HAR
A
Natt
ta
tee
STAC
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atria
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nt

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Icom IC-701 Specifications

General IconGeneral
BrandIcom
ModelIC-701
CategoryTransceiver
LanguageEnglish

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