Standard C828M User manual
OPERATING
INSTRUCTIONS
C828M
2m
FM
lOW
We
are
happy
you
have
chosen
our
new
product
STANDARD
C828M,
the
füll
solid
State
FM
transceiver
for
the
amateur
radio
in
2m
band.
The
Model
C828M
has
been
developed
by
your
STANDARD
COMMUNICATIONS
CORP
with
unsparing
applications
of
its
tradltionally
held
ultraminiaturization
tech-
niques
and
with
its
personal
considerations
given
from
the
Standpoint
of
the
users.
It
is
carefully
designed
in
every
respect
and
manufactured
at
STANDARD's
modern
factory.
We
are
sure
that
a
number
of
features
and
excellent
reliability
will
pro-
vide
you
with
great
satisfaction.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
TABLE
OF
CONTENS
Features
of
C828M
2
Cautions
Prior
to
Use
6
Installation
Procedures
8
Communication
Procedures
9
Repeater
Offset
Oscillator
10
"Busy"
Indicator
Lamp
10
Meter
11
Stand
11
Adjustment
of
Microphone
Sensitivity
12
Microphone
Connector
12
Accessory
Terminal
13
Channel
Increase
14
Accessory
Parts
15
Connection
of
External
Speaker
15
Antenna
and
Coaxial
Gable
16
Noise
Prevention
Measures
for
Use
as
Mobile
Station
17
C828M
Specification
18
Block
Diagram
19
Circuit
Diagram
20
—
1
—
1.
Features
of
C828M
We
know
that
lighter
and
smaller
high-performance
equipment
creates
new
appli-
cation,
and
this
is
quite
true
of
C828M.
Such
features
and
many
others
of
this
Model
as
mentioned
below
will
enable
all
of
you-from
beginners
to
veterans-to
enjoy
a
broader
scope
of
the
usages.
1.
small
Size
and
Light
Weight:
This
new
FM
transceiver,
smaller
in
volume
than
a
half
size
of
the
comparable
products
of
this
Company
and
as
light
as
0.96
kg,
has
succeeded
in
hnding
its
Installation
space
for
mobile
Station
use
at
vehicle
driver's
seat
area
instead
of
assistant
driver's
which
has
been
exclusively
used
for
this
purpose
in
the
past,
ushered
in
the
debut
of
a
new
type
mounting
metal
bracket.
2.
Push-In/Push-Out
Bracket:
This
metal
bracket
has
simplified
the
attaching
and
detaching
processes
of
C828M
on
a
Single
motion
basis.
For
attaching,
just
snap
your
transceiver
into
the
bracket.
The
reve/'se
consequence
can
be
obtained
by
simply
snapping
it
off
toward
you.
The
bracket
with
the
transceiver
off
therefrom
is
an
evenly
faced
metal,
which
therefore
prevents
rattling
causable
during
the
vehicle
Operation
and
also
protects
your
feet
against
a
possible
hazard
from
a
sharp
projection.
Such
attaching
and
detaching
processes
do
not
require
you
to
put
in
your
hands
on
the
sides
of
the
rig.
Thus,
the
attaching
process
brings
the
sides
of
the
rig
into
a
dose
contact
with
their
corresponding
parts.
The
rig's
occupancy
of
small
space
serves
for
the
efficient
employment
of
the
limited
interior
room
of
the
car.
^
'
3.
Single
Crystal
System
Common
to
Transmission
and
Reception:
The
adoption
of
the
Single
crystal
system,
in
which
one
crystal
is
used
for
both
transmission
and
reception
of
Signals,
has
opened
the
way
to
an
economical
In
stallation
of
additional
Channels
and
the
very
expedient
experiment
or
Operation
in
Joint
use
of
multifarious
external
oscillators.
4.
One
Action
Repeater
Changeover
System:
The
transceiver
has
3
built-in
offset
oscillators
including
SIMPLEX.
This
fea-
ture
together
with
the
füll
advantages
of
the
single
crystal
system
permits
change
over
to
the
repeater
Channel
with
a
fi
nger
action
of
switch
on
the
front
panel.
5.
Call
switch
for
Tone
Burst
Signal
Transmission:
C828M
incorporates
tone
burst
device
(CTN-5).
By
pressing
the
call
switcb
(momentary
switch)
for
Operation
of
repeater
Channel,
a
high
power
tone
burst
Signal
is
transmitted,
thus
assuring
stabilized
Operation
of
repeater.
6.
Hi-Low
Power
Changeover:
By
setting
the
function
switch
on
the
front
panel
from
"
high
"
to
"
low
"
power
Position,
the
antenna
Output
is
reduced
from
lOW
to
IW
with
resultant
decrease
of
power
consumption.
This
prevents
radio
interference
and
other
disturbances
during
local
QSO,
providing
smooth
and
efficient
Operation.
7.
Remote
Control
System
for
External
Oscillator
Changeover:
Connection
of
external
oscillator
to
the
transceiver
can
be
made
simply
by
flipp-
ing
the
evternal
oscillator
switch
on
the
microphone.
8.
Professional-minded
Circuit
Design:
FET's,
Silicon
transistors
and
diodes
are
abundantly
used
in
the
circuitry
de-
—
9
signed
with
Professional
minded
techniques
and
latest
technicl
knowhow.
(a)
Receiver
(1)
High
Sensitivity
High
sensitivity
design
as
represented
by
the
~3dB
QS
20dB
and
the
over
23dB
S/N
at
OdB
input.
(2)
Excellent
Cross-Modulation
Characteristics
The
e3
cellent
cross-modulation
characteristics
are
due
to
the
use
of
FET's
for
the
radio
frequency
ampliher
and
the
fi
rst
and
second
mixers,
also
due
to
the
removal
of
the
fi
rst
intermediate
frequency
(IF)
amplifier
and
the
gains
distribution
made
with
our
new
technical
approach.
(3)
Ceramic
Filter
The
two
ceramic
fi
lters
in
the
second
IF
amplifying
stage
play
a
role
for
the
alleviation
of
ripples
within
pass
band
for
better
selectivity
characteri
stics.
_
(4)
Integrated
Circuits
The
second
IF
amplifying
stage
consists
of
3-stage
amplifying
unit
plus
the
integrated
circuitry,
thus
showing
very
good
limiter
effect.
(5)
Squelch
Circuit
The
squelch
circuit
is
a
noise
rectifier
type
enjoying
an
established
reputa-
tion
for
mobile
Station
use,
and
the
circuit
operates
securely,
thanks
to
the
high
gains
resulting
from
the
2-stage
noise
amplification.
(6)
Squelch
Time
Constant
With
the
squelch
unit
(accessory)
connected
to
the
accessory
terminal
on
the
rear
panel,
the
squelch
time
constant
can
be
changed
to
the
best
suitable
value
for
respective
uses
as
mobile
and
fi
xed
stations.
(7)
3W
of
Audio
Output
The
maximum
audio
Output
is
as
high
as
3W,
permitting
the
Operation
of
your
transceiver
at
Optimum
sound
level
even
in
a
noisy
expressway.
(8)
"Busy"
Indicator
Lamp
The
green
lamp
turns
off
and
on
in
association
with
the
squelch
circuit,
regardless
of
the
Position
of
the
volume
control
knob,
to
clearly
indicate
which
rig
is
receiving
the
signal.
This
lamp
is
convenient
in
a
parallel
Oper
ation
at
50MHz,
430MHz
and
other
bands.
(9)
Highly
Sensitive
Incoming
Signal
Meter
This
incoming
signal
meter,
containing
a
meter
amplifier
designed
to
swing
the
pointer
in
response
even
to
weak
incoming
signal,
can
show
the
exact
change
in
the
input
voltage
of
the
antenna.
(b)
Transmitter
(1)
High-gain,
High-efficiency
Transistors
Newly
developed
high-gain,
high-efficiency
transistors
are
used.
The
fi
nal
stage
is
equipped
with
2N6082
providing
sufficient
margin
to
the
Operation.
(2)
Offset
Mixer
Provided
with
FET
The
MOS
FET
incorporated
in
the
offset
mixer
of
the
signal
transmitting
section
reduces
the
occurrence
of
spurious
radiation.
(3)
Direct
FM
Modulation
System
The
22.
OMHz
frequency
from
the
offset
oscillator
undergoes
direct
FM
modulation.
This
eliminates
the
difference
of
modulation
degree
between
—
3
-
Channels.
(4)
Twisted
Wire
Twisted
wire
is
used
for
stable
impedance
conversion
and
wide
bandwidth
characteristics.
(5)
Splatter
Filter
The
RC
network
filter
and
the
transistor
operated
splatter
filter
provide
high
clarity
and
high
average
level
of
modulation,
and
cause
no
interference
with
other
Channels
through
expansion
of
the
band
occupancy.
(6)
Microphone
Gain
Control
A
semi-fixed
resistor
for
microphone
gain
control
is
mounted
on
the
main
printed
wiring
boad
for
transmitter.
(7)
Transmitter
Indicator
Lamp
and
Meter
When
the
push
button
on
the
microphone
is
pressed,
the
red
pilot
lamp
illuminates
to
show
that
the
transmitter
is
in
transmitting
mode.
Düring
the
transmission,
the
meter
indicates
the
relative
value
of
the
transmitting
Output.
(8)
Channel
Selector
With
Short-circuiting
Ring
The
Channel
selector
of
C828M
is
provided
with
a
short-circuiting
ring
to
prevent
possible
interference
caused
when
additional
Channels
are
installed
or
when
the
frequencies
of
neighboring
Channels
are
adjusted,
thereby
help-
ing
make
the
frequency
alignment
much
easier
during
the
installation
of
ad
ditional
Channels.
The
trimmer
capacitor
for
delicate
alignment
for
both
the
transmitter
and
receiver
performs
accurate
adjustment
of
all
the
Channel
fre
quencies.
(9)
Uncasing
Possible
with
No
Holp
of
Tools
Uncasing
is
possible
with
the
two
screws
in
the
rear
removed
by
the
fi
n-
gertip
Operation.
This
feature
lends
itself
to
the
addition
of
the
Channel
and
other
purposes.
(10)
Anodized
Alminum
Chassis
Anodized
alminum
is
used
for
both
the
case
and
chassis.
The
main
chassis
is
2mm
thick
for
an
adequate
mechanical
strengt
and
designed
to
show
good
heat
sink
effect.
(11)
Antenna
Connector
The
M-shaped
antenna
connector
screws
have
their
pitches
available
com-
monly
in
both
inch
and
millimeter.
(12)
Microphone
Connector
with
Speaker
Terminal
A
4-pin
connector
is
used
for
microphone
connection.
Since
audio
Output
is
connected
to
No.
4
pin,
this
connector
permits
connection
of
telephone
handset
as
well
as
the
microphone.
(13)
Accessory
Terminal
(A.T.)
A
9-pin
accessory
terminal
is
provided
on
the
rear
for
connections
of
ac
cessory
units
from
outside.
(14)
Wide
Range
of
Operating
Temperature
The
operating
temperature
ranges
from
—30°C
to
-)-60°C.
This
is
good
enough
for
mobile
Operation
even
in
severely
cold
environments.
(15)
Microphone
with
Switches
The
microphone
is
equipped
with
external
oscillator
switch
and
P.T.T.
Switch
(microswitch).
Sharp
switching
from
transmission
mode
to
reception
_
4
—
mode
or
vice
verse
is
assured.
(lE^
Detachable
Stand
The
detachable
stand
furnished
facilitates
the
use
of
C828M
as
a
fixed
Station.
(17)
Power
Supply
Protective
Circuit
The
power
supply
circuit
is
provided
with
a
protective
function
so
as
to
keep
the
internal
circuit
from
any
possible
damage
caused
in
wrcng
connec-
tion
of
the
power
supply.
(18)
Ant,
Protector
Antenna
protector
circuit
Starts
to
work
on,
when
antenna
becomes
to
open
or
Short
circuit,
or
degradation
of
SV/R.
Transmitting
LED
goes
to
dark
when
there
is
no
more
RF
output.
Ii
r^ic
occasion
try
to
fi
nd
out
abnormal
point
on
the
antenna
circuit
and
reset
•
radio
to
a
normal
condition
of
the
transmission.
Accordingly
the
antenna
Protector
Circuit
is
automatically
re-
leased
to
its
normal
condition.
—
5
—
2.
Cautions
Prior
to
Use
The
following
precautions
must
be
observed
for
the
maximum
Performance
of
your
C828M
and
for
your
enjoyment
of
better
ham
life:
1.
DO
NOT
Connect
or
disconnect
the
power
supply
cord
when
the
power
supply
Switch
is
in
ON
position.
2.
DO
NOT
connect
or
disconnect
the
antenna
or
external
Speaker
when
the
power
supply
switch
is
in
ON
position.
3.
DO
NOT
push
the
microphone
switch
with
the
antenna
left
disconnected.
4.
BE
SURE
to
replace
the
blown-off
fuse
withe
a
new
one
rated
at
3A.
5.
CHECK
to
see
the
polarity
of
the
electrical
system
prior
to
the
power
supply
connection.
C828M
is
designed
for
negative
grounding;
the
black
lead
should
be
connected
to
the
ground.
Od)
(D®
(b
d
Figure
2—1
—
6
—
Figure
2—1
Transmission
Indicator
Repeater
Indicator
Lamp
Mounting
Metal
Brackel
Auxiliary
Mounting
Metal
Brackel
Volume
Control
Knob
Power
Switch
®
Squelch
Control
Knob
Channel
Selector
EXT-OSC
Switch
Antenna
Connector
F.T.T.
Switch
External
Speaker
Terminal
Busy
"
Indicator
Lamp
3.
Installation
Procedures
Prior
to
Installation,
determine
the
instaliation
position
observing
the
following
Points:
*
I
fhere
any
unusual
posture
required
in
the
Operation
of
the
Channel
Selector
and
other
control
knobs?
*
Are
all
the
control
knobs
and
meter
scale
face
located
in
piain
view
?
*
Isn't
the
instaliation
position
of
the
rig
for
use
as
a
mobile
Station
impeding
the
general
motions
of
the
vehicle
driver
or
the
Operator
of
C828M?
*
Specifically
for
use
as
a
mobile
Station,
make
sure
not
to
place
the
transceiver
anywhere
near
a
heater
duct,
air
conditioner's
exhaust
mouth,
air
intake
mouth
and
the
like.
*
Refrain
from
mounting
the
transceiver
on
such
places
as
exposed
to
rainfall
and
sea
water.
Although
there
is
no
restriction
as
to
the
Installation
posture
of
C828M,
it
is
recommended
that
the
body
of
the
transceiver
be
set
upright
for
use
in
yachts,
commercial
vehicleshetc.
After
the
instaliation
position
is
determined,
install
the
transceiver
according
to
the
following
procedures:
1.
Take
out
the
furnished
mounting
metal
bracket
(17)
and
attach
it
to
the
body
of
the
transceiver.
2.
Position
the
mounting
bracket
in
predetermined
instaliation
place,
make
a
bore
for
the
bracket
with
a
5—5.5mm
drill,
and
secure
it
with
the
supplied
screws
and
nuts,
preferably
at
three
or
more
places.
Use
wooden
or
tapping
screws
according
to
the
mounting
plane.
3.
Set
the
body
of
the
transceiver
again
on
the
mounting
bracket.
4.
Connect
the
power
supply.
At
this
time,
again
make
sure
of
the
polarity
of
the
electrical
system.
5.
Firmly
secure
the
antenna
to
the
antenna
connector
(13).
Refer
to
Fig.
2-1.
6.
Connect
the
microphone
to
the
microphone
connector
(3)
on
the
front
of
the
transceiver,
and
fix
the
supplied
microphone
hanger
on
a
convenient
place
for
lifting
(see
Fig.
2-1).
The
above
completes
the
instaliation,
and
you
are
now
ready
to
start
commimi-
cation.
~
8
—
4.
Commuiiication
Procedures
^
1.
Preparation
for
Communication
First,
turn
the
SQL
knob
(2)
fully
counterclockwise,
and
then
set
the
Channel
selector
(11)
to
the
Channel
you
desireto
use.
2.
Turn
on
the
power
supply
switch.
Turn
the
VOL
OFF
knob
(1)
clockwise
until
it
clicks.
The
Channel
selector
lamp
and
the
meter
lamp
will
light
up
to
show
that
the
power
is
on.
3.
Adjust
the
volume.
As
you
turn
the
VOL
OFF
knob
(1)
clockwise,
you
will
come
to
a
point
where
a
rustling
noise-or
the
conversation
in
the
case
someone
is
talking
over
the
chan-
nel-becomes
audible.
Set
the
knob
for
suitable
volume
while
listening
to
the
noise
or
the
conversation.
4.
Set
the
squelch
control.
Turn
the
Channel
selector
and
set
the
SQL
knob
(2)
using
an
empty
Channel,
Turn
the
knob
slowly
in
the
clockwise
direction
until
you
come
to
a
point
where
the
noise
suddenly
goes
off.
Set
the
SQL
knob
on
this
point
and
you
will
hear
no
noise
but
the
incoming
Signal
alone
through
the
Speaker.
In
this
case,
if
the
signal
is
unclear
because
of
the
squelch
circuit
being
off
and
on
due
to
the
signal
condition
of
your
party's
Station,
turn
the
SQL
knob
slightly
further
to
the
right.
5.
Transmission:
Set
the
repeater
switch
and
hi-low
power
switch
to
the
desired
positions.
Take
up
the
microphone
and
press
the
push
button
on
the
microphone.
Speak
into
the
microphone
slowly
and
distinctly
in
normal
tone
of
voice.
At
this
time,
the
red
lamp
in
the
front
illuminates
to
show
the
transmitting
Status
as
long
as
the
push
button
remains
pressed.
Simultaneously,
the
meter
indicates
the
com-
parative
value
of
the
transmission
power.
Now,
your
voice
is
out
on
the
air.
-
9
—
5.
Use
of
Repeater
Offset
Oscillator
The
transceiver
is
provided
with
3
offset
oscillators
including
one
for
Simplex.
Crystals
are
bullt
in
the
fi
rst
offset
oscillator
(22.0
MHz)
for
simplex
and
the
second
offset
oscillator
(21.4
MHz)
for
REPEATER
A
position,
while
the
third
offset
oscil
lator
for
REPEATER
B
position
is
provided
with
a
crystal
socket
so
that
a
system
other
than
repeater
system,
whose
transmit
frequency
is
deviated
600
kHz
from
the
receive
frequency,
can
be
used.
When
the
transceiver
is
used
in
the
simplex
mode,
set
the
toggle
switch
on
the
front
panel
to
the
"
S
"
position.
The
first
offset
oscil
lator
(22.0
MHz)
is
operated
and
the
transmit
and
receive
frequencies
become
the
same.
With
the
switch
set
to
REPEATER
position
A,
the
second
offset
oscillator
(21.4
MHz)
is
operated
and
the
transmit
frequency
is
lowered
to
600
kHz
below
the
re
ceive
frequency;
thus,
changeover
to
the
repeater
Channel
can
be
accomplished
by
one
finger
action.
The
frequency
used
for
the
first
local
oscillator
for
the
repeater
Channel
is
therefore
referred
to
the
receive
frequency
(see
"Ordering
the
Crystal
Oscillator
Element).
6.
"Busy"
Indicator
Lamp
The
green
"
busy
"
indicator
lamp
on
the
front
panel
turns
off
and
on
according
to
the
emitter
voltage
of
Q307
which
is
varied
by
the
ON/OFF
Operation
of
the
squelch
circuit.
This
indicator
lamp,
being
independent
of
the
audio
Output,
illumi-
nates
in
green
to
show
that
Signals
are
being
received,
even
if
the
volume
control
is
turned
down;
and
when
in
parallel
use
of
the
rigs
for
50
MHz,
430
MHz
and
others,
the
green
lamp
teils
from
which
rig
the
signal
is
being
received.
—
10
7,
Meter
Meter
(lO)
indicates
the
strength
of
the
incoming
signal
in
the
receiving
mode
and
the
comparative
value
of
transmission
power
in
the
transmitting
mode.
Düring
re-
ception
of
receive
signal,
the
incoming
signal
strength
to
swing
the
pointer
by
8
graduations
is
equivalent
to
5fiY
(14
dB).
The
indication
of
receive
signal
Output
is
set
to
about
8
graduations.
See
Fig.
7-1
for
the
relationship
between
the
incom
ing
signal
and
the
scale
of
the
meter.
14
<0
.1
10
2
4
6
8
Meter
indicator
Figure
7-1
8.
Stand
C828M
is
provided
with
the
stand
(i9)
for
use
as
a
fi
xed
Station.
Insert
the
stand
into
the
small
bores
on
both
sides
of
the
case
as
shown
in
photo
below.
-
11
—
9.
Adjustment
of
Microphone
Sensitivity
The
microphone
sensitivity
is
adjusted
to
best
meet
the
purpose
of
mobile
and
fi
xed
stations.
However,
any
further
adjustment
of
the
sensitivity
will
be
made
of
the
semifixed
resistor
R301
as
shown
in
Fig.
9-1
below.
Alignment
of
mike
sens.
R301
\i
Alignment
of
deviation
R311
1
o
Figure
9-1
10.
Microphone
Coiinector
Microphone
connection
will
be
made
as
indicated
in
the
Figure
below.
Figure
10-1
No.
1
Hot
microphone
terminal
(common
with
AT-2)
No.
2
Grounding
terminal
(common
with
AT-1)
No.
3
Microphone
push-button
terminal
(common
with
AT-3)
No.
4
Audio
Output
terminal
(common
with
AT-7)
—
12
—
11.
Accessory
Terminal
The
accessory
terminal
connection
will
be
made
as
showo
in
Fig.
11-1.
You
can
devise
various
accessory
connections,
using
this
terminal.
Terminal
No.
Connection
AT-1
Grounding
AT-2
External
oscillator
switching
AT-3
N.C.
AT-4
N.C.
AT-5
First
local
oscillator
input
AT-6
FM
detector
Output
AT-7
External
oscillator
VFO
input
AT-8
+13.8
V
(receiving
time)
AT-9
+13.8
V;
power
supply
before
power
supply
switch
is
turned
on
Fig.
11-1
AT
—
13
—
12.
Chaimel
Increase
1.
Specifications
of
Crystal
Oscillating
Unit
Use
the
crystal
oscillating
unit
of
the
size
of
HC25/U.
The
fi
rst
local
oscillator
frequency
of
C828M
is
based
on
8-multipIication
system,
and
the
fi
rst
intermediate
frequency
is
22.0
MHz.
Therefore,
the
frequency
of
the
crystal
oscillating
unit
can
be
obtained
from
the
following
formula:
fr-22.0
fo=
8
2.
fo:
Frequency
of
crystal
oscillating
unit
(MHz)
fr:
Wanted
transmit/receive
frequency
(MHz)
Crystal
Oscillator
Installation
Procedures
When
the
crystal
oscillating
unit
of
your
desired
frequency
is
reay,
take
out
the
chasis
of
this
transceiver
from
the
case
by
removing
the
two
case
mounting
screws
from
the
rear.
For
the
arrangement
of
the
socket
of
the
crystal
oscillat
ing
unit,
see
Fig.
12-1
below.
CRYSTAL
LOCATION
oo
CKSE)
OCES)
CKSn)
CKEID
OdOD
CKmD
CKHE)
(ÜöSkD
(UDO
QlilHD
Figure
12-1
3.
Frequency
Adjustment
The
offset
oscillator
of
C828M
and
the
frequencies
of
the
actually
loaded
Chan
nels
have
been
precisely
adjusted.
However,
if
additional
Channels
are
installed,
be
sure
to
perform
necessary
Channel
frequency
adjustments.
In
case
that
a
fre
quency
counter
is
not
available,
conduct
the
adjustments
according
to
the
follow
ing
procedures,
using
the
accessory
terminal:
First,
connect
a
30
to
50/iA
amperemeter
to
the
accessory
terminal
No.
1
and
No.
6
pins.
(a)
Align
the
receiving
frequency
of
your
Station
with
the
frequency
of
your
party's
Station.
While
in
reception
of
the
signal
from
your
party's
Station,
ad-
just
the
trimmer
capacitor
in
the
crystal
oscillating
circuit
so
that
the
connected
amperemeter
indicates
zero
graduation.
If
the
sound
is
distorted
or
you
hear
-
14
—
no
sound
with
the
amperemeter
pointing
to
zero,
then
make
further
adjustment
on
the
trimmer
capacitor
till
you
get
proper
adjustment.
(b)
Adjust
the
frequency
of
your
party's
Station
to
your
Station.
In
this
case,
your
party's
Station
should
be
provided
with
a
fi
ne
adjusting
circuit
for
transmit
and
receive
frequencies.
Have
him
adjust
his
transmit
and
receive
frequencies
in
the
same
manner.
13.
Accessory
Parts
The
following
accessory
parts
are
availabi
for
C828M
(1)
Speaker
box,
C205K
(4
ohms)
(2)
AC
Power
supply,
C12/120-5,
13.
8
V
3A
(3)
AC
power
supply,
C12/120-2,
9-16
V
6.5A
(4}
VFO,
CVllO
14.
Gonnection
of
Extemal
Speaker
If
large
sound
volume
is
desired,
connect
external
Speaker
to
SPK
terminal
on
the
rear
panel.
Note:
Use
an
external
Speaker
rated
at
4—8
ohms
of
impedance
—
15
—
15.
Anteima
and
Coaxial
Cables
The
Performance
of
your
C828M
depends
on
the
quality
of
antenna
and
coaxial
cables.
Pay
attention
to
the
following
when
you
purchase
your
antenna
and
coaxial
cables.
Antenna:
1.
Use
the
antenna
having
a
matched
impedance
of
50
ohms.
2.
Install
the
antenna
as
high
as
possible.
Roof
top
is
recommended
for
installa-
tion
fer
mobile
Station
use.
3.
Use
the
antenna
of
high
Performance.
Coaxial
Cable:
1.
Use
the
coaxial
cable
having
a
matched
impedance
of
50
ohms.
Do
not
use
3C-2V,
5C-2V,
etc.,
because
they
are
rated
at
75
ohms
of
impedance.
2.
The
coaxial
cable
should
be
preferably
as
large
as
possible
in
size.
If
the
cable
length
is
less
than
5m,
use
RG-58U,
5D-2V,
etc.
If
the
cable
length
is
longer
than
5m,
use
RG-8U,
8D-2V,
10D-2V,
etc.
See
Fig.
15-1
below.
50000
30000
20000
10000
500
<-
300
*-
10
20
30
50
100
200
300
500
1000
(reqoencyl
MHi)
Figure
15-1
—
16
-
16.
Noise
PrevetioB
Measure
for
Use
as
Mobile
Station
Precautions
for
installation
of
this
transceiver
in
cars
and
others
have
been
men-
tioned
previously.
The
following
measures
will
be
effective
for
installation
in
spe-
cific
types
of
cars
and
motor-boats
whose
engine
may
produce
excessive
noises:
bailery
distributer
ignilion
su'iich
ignition
coil
ignilion
plug
circuil
breaker
A.C.&E-Anti-noise
capacilor
for
automobile
B
&
O-Anii-noise
resislor
for
automobile
Figure
16-1
The
noise
prevention
capacitors
and
resistors
may
be
inserted
in
the
places
shown
as
A,
B,
C,
D
and
E
in
Fig.
16-1
above.
In
some
cars,
the
noise
can
be
preveted
with
such
insertion
at
only
one
place.
In
some
other
cars,
noise
can
be
decreased
if
C828M
is
powered
by
car
or
motor-boat
battery
directly
wired
to
the
transceiver.
—
17
—
17.
C828M
Specification
General
1.
Application:
2.
Number
of
Channels
for
Transmitter/Receiver;
3.
Frequency
Range:
4.
Operating
Temperature
Range
5.
Microphone:
6.
Power
Supply
Voltage:
7.
Power
Consumption:
8.
Semi-Conductor:
9.
Dimensions:
10.
Weight:
Transmitter:
1.
Transmitting
Radio
Wave:
2.
Transmitting
Output:
3.
Output
Impedance:
4.
Maximum
Frequency
Deviation:
5.
Modulation
System:
6.
Frequency
Stability:
7.
Frequency
Multiplication:
8.
Modulation
Distortion:
9.
S/N:
Receiver:
1.
Receiver
Model:
2.
Intermediate
Frequency:
3.
First
Local
Oscillator
Frequency
Multiplication:
4.
Frequency
Stability:
5.
Sensitivity
(20
dB
QS):
6.
S/N
at
0
dB
Input:
7.
Squelch
Threshold
Sensitivity
:
8.
Bandwidth:
9.
Selectivity:
10.
Spurious
Response:
11.
Allowable
Maximum
Frequency
Deviation:
12.
Audio
Output:
144
MHz
and
FM
amateur
transceiver
12
Channels
mO'-'MaOMHz.
145.0--147.0MHz
and
146.0^148.0
MHz
-30X'-
+
60°C
Dynamic
type
with
memory
switch
(with
Neoprene
coiled
cord)
13.8
V
DG
±20%
(negative
grounding)
In
transmission:
2.6A
In
reception
(Max.
Output):
0.8A
In
standby:
0.32A
37
transistors,
20
diodes
and
1
IC
84(W)x58(H)x235(D)
mm
0.96
kg
F3
lOW
min-Hi-power
IW
nom-Low
power
50
ohms
±5
kHz
Direct
FM
modulation
by
offset
oscillator
Less
than
0.002%
8
times,
1
heterodyne
Less
than
10%
Better
than
45
dB
Double
conversion
superheterodyne
First
IF
22.0
MHz
Second
IF
455
kHz
8
times
Less
than
0.003%
Better
than
—3
dB
(OdB=l/iV)
Better
than
23
dB
Better
than
—10
dB
10
kHz
or
more
75
dB
or
more
(25
kHz
detuning)
70
dB
or
more
±5
kHz
External
Speaker
(4
ohms)-Max.
Output
3W
J8
—
18.
C828M
Block
Diagram
RF'AMP
-C»
IST
MIX
INO-MIX
zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA-«■
2NDIF
-fr
2NDIF
-B>
2NDIF
METER
AMP
22.^
_J
™
DETECTORj
gn
NOISE
1
AMP
D.C.
AMP
'
f
NOISE
NOISE
AMP AMP
AF
AMP
D.C.
AMP
S.W.
POWER
AMP
BUSY
IND-
POWER
AMP
S.P.
Hd
*r0
ISTLOCAL
OSC
IST
2ND
aRD
OFFSET
DOUB
r
DOUB
DOUB
i
1
MIX
EXTOSC
IND-
EXT
OSC
V4
METER
DETECT'
EXT
OSC
R.P.T./
IND-
*
»
AF
AMP
MOD
OFFSET
OSC
MOD
OFFSET
OSC
|21.4
I
MHz
OFFSET
OSC
OFFSET
sw
•
AMP
AMP
PRE
DRIVER
—
19
—
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