Kenwood TR-7850 User manual
qi~
ACCESSORIES
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2
FEATURES
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3
SPECIFICATIONS
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4
SECTION
1
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INSTALLATION
1
.1
Interconnection
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5
1
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Mobile
Installation
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5
1
.3
Fixed
Station
Installation
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6
1
.4
Back-up
Power
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7
SECTION
2
.
CONTROLS
AND
TERMINALS
2
.1
Front
Panel
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8
2
.2
Rear
Panel
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10
SECTION
3
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OPERATION
3
.1
Generals
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11
3
.2
Memory
Input
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11
3
.3
SCAN
(Busy
stop)
Operation
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12
3
.4
PRIORITY
OPER
Switch
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12
3
.5
TX
OFFSET
and
REVERSE
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12
3
:6
AUTO
PATCH
Operation
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12
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SQUELCH
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12
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.8
HI/LOW
Switch
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12
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Meter
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13
3
.10
TONE
Switch
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13
3
.11
Adjustments
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13
SECTION
4
.
ADDITIONAL
INFORMATION
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13
SECTION
5
.
OPTIONAL
ACCESSORIES
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14
SCHEMATIC
DIAGRAMS
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15
BLOCK
DIAGRAMS
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16
AFTER
UNPACKING
CONTENTS
INTRODUCTION
You
are
the
owner
of
our
latest
product,
the
new
TR-7850
transceiver
.
carefully
before
placing
your
transceiver
in
service
.
The
unit
has
been
carefully
engineered
and
manufactured
to
rigid
quality
standard,
and
should
give
you
satisfactory
and
dependable
operation
for
many
years
.
ACCESSORIES
Please
read
this
instruction
manual
"
Shipping
container
:
Save
the
boxes and
packing
in
the
event
your
unit
needs
to
be
transported
for
remote
operation,
or
service
.
"
The
following
explicit
definitions
apply
in
this
manual
:
Note
:
If
disregarded,
inconvenience
only,
no
risk
of
equipment
damage
or
personal
injury
.
Caution
:
Equipment
damage
may
occur,
but
not
personal
injury
.
maintenance,
Carefully
unpack
your
TR-7850
and
check
that
it
is
supplied
with
the
following
accesories
:
(1)
Dynamic
microphone
(with
U/D
switch)
50051
(T90-0313-05)
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.1
piece
(2)Mounting
Bracket
Mounting
parts
:
Hex
wrench
(wo1-0401-04)
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1
piece
Nuts
(5
mm
diameter)
(N
14-0510-04)
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4
pieces
Hex-socket
screw
(N09-0008-04)
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.4 pieces
Flat
washers
(6
mm
diameter)
(N
15-1060-46)
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4
pieces
Spring
washer
(6
mm
diameter)
(N1
6-0060-46)_
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4
pieces
(3)
Feet
Rubber
foot
(small, rear)
002-0069-05)
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2
pieces
Rubber
foot
(large, front)
(J02-0070-05)
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2
pieces
Screw
(N30-3006-46)
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.2
pieces
Screw
(N30-3008-46)
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.2
pieces
(4)
DC
power
cord
(with
2P
plug
and
fuse)
(E30-1685-05)
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1
piece
(5)
Spare
fuse
(10A)
(F05-1031-05)
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1
piece
(7)Miniature
plug
(for
external
speaker)
(E12-0001-05)
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.1
piece
(9)Warranty
card
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1
copy
(10)
Instruction
manual
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1
copy
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FEATURES
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15
MULTIFUNCTION
MEMORY
CHANNELS,
EASILY
9
BUILT-IN
AUTOPATCH
DTMF
ENCODER
SELECTABLE
WITH
A
ROTARY
CONTROL
Keyboard
operates
as
autopatch
encoder
M1
-M13
. .
memorize
frequency
and
offset
(±600
kHz
repeater
autopatch
.
or simplex)
M14,MO
. .
.
. .
memorize
transmit
and
receive
frequencies
independently
for
nonstandard
offset
.
MO
. .
.
......
.
. .
priority
channel
with
simplex,
±600
kHz, or
nonstandard
offset
operation
.
10
INTERNAL
BATTERY
BACKUP
FOR
ALL
MEMORIES
All
memory
channels
(including
transmit
offset)
are
retained
when
four
AA
Ni-Cd
batteries
(not
KENWOOD
supplied)
are
installed
in
battery
holder
inside
TR-7850
.
Batteries
are
automatically
charged
while
transceiver
is
connected
to
12V
DC
source
.
PRIORITY
ALERT
MO
memory
is
priority
channel
.
EXTENDED
FREQUENCY
COVERAGE
143
.900
^
"
148
.995
MHz
in
switchable
5
kHz
or
10
kHz
steps,
allowing
simplex
and
repeater
operation
on
many
MARS
frequencies
.
Do
not
adjust
coils,
trimmers,
or
pots!
These
are
factory
adjustments
.
Do
not
install
near
heater
outlet
.
BEFORE
connection,
check
polarity
.
FRONT-PANEL
KEYBOARD
For
frequency
selection,
transmit
offset
selection,
memory
programming,
scan
control,
and
selection
of
autopatch
encoder tones
.
AUTOSCAN
Entire
band
(5
kHz
or
10
kHz
steps)
and
memories
.
Automatically
locks
on busy
channel
;
scan
resumes
automatically
after
several
seconds
unless
CLEAR
or
mic
PTT
button
is
pressed
to
cancel
scan
.
SEPARATE
DIGITAL
READOUTS
To
display
frequency
(both
receive
and
transmit)
and
memory
channel
.
SELECTABLE
POWER
OUTPUT
40
watts
(Hi)/Low
Power
(1
to
15W)
BUILT-IN
PIEZO-ELECTRIC
BUZZER
to
access
. .
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BEFORE
USE
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This
unit
is
designed
for
12V,
negative
ground
ONLY
.
After
parking
in
the
sun,
and
inside
temperature
is
HOT,
cool
this unit
BEFORE
transmitting
.
Keep
equipment
away
from
heat
and
out
of
direct
sunlight
.
3
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[General]
Semiconductors
.
.
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. . . .
MPU
1
ICs
19
Transistors
60
FETs
9
Diodes
79
Frequency
range
.
.
......
.
...
.
............
.
"...".". . ".
. .
...
144
.000
to
147
.995
MHz
Frequency
synthesizer
.
...
.
............
.
............
.
...
Digital
control,
phase
locked
VCO
Mode
.
.
...
.
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.
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......
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.
............
.
...
FM
(F3)
Antennaimpedance
.
.......
.
...........
.
............
.
...
50
ohm
Power
requirement
.
.
...
.
...
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.
....
".
. .
"
...
.
...
13
.8V
DC
±15%
Grounding
......
.
...
.
...
.
...
.
....
.
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.
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.
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.
....
.
. .
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. .
. .
. .
Negative
Operating
temperature
.
....
.
...........
. .
...
.
. .
. .
. .
. .
. .
-
20°C
to
+50
1
C
Current
drain
...
.
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...
.
...
.
...
.
...........
. .
...
.
. .
. .
. .
. .
. .
0
.4A
in
receive
mode
with
no
input
signal
9A
in HI
transmit
mode
(Approx
.)
Less
than
3
mA
for
memory
backup
(from
an
external
power
supply
through
the
backup
terminal)
Less than
2
mA
for
memory
backup
(from
battery)
Dimensions
. .
.
...
.
...
.
............
.
..........
.
..........."
.
"
175
mm
(6-7/8")
wide
64
mm
(1-1/2") high
220
mm
(8-5/8")
deep
(projections
excluded)
Weight
.
...
. .
...
.
.......
.
............
.
...
.
...
.
...............
.
.
2
.2
kg
(4
.84
Ibs)
(approx
.)
[Transmitter
Section]
RF
output
power
(at
13
.8V
DC,
5052 load)
...
.
.
HI
40
Watts
min
.
LOW
1
to
15
watts
approx
.
(According
to
FREQ
.)
Modulation
....
.
...........
.
...
. .
. .
.
............
.
. .
. .
......
.
.
Variable
reactance
direct
shift
Frequency
tolerance
.......
. .
. .
.
............
.
...
.
...
.
...
.
Lessthan
±20
x
10
-6
(
-
20°C^J
+
50°C)
Spurious
radiation
. .
.
........
.
. .
...
......
.
...
.
.......
.
....
HI
Lessthan
-
60dB
LOW
Lessthan
-
53dB
Maximum
frequency
deviation
(FM)
. .
.........
""
±5
kHz
Microphone
...
.
...
.
.......
.
....
.
. .
...
. .
. .
. .
.
.."
."
.."........
Dynamic
microphone
with
PTT
switch,
50052
[Receiver
Section]
Circuitry
........
.
...
.
...........
. .
. .
...
. .
".
...
.
.......
. .
"""
.
."
Double
conversion
superheterodyne
Intermediate
frequency
. .
. .
. .
...
. .
".
...
.
.......
. .
".
. .
. .
1st
IF
10
.695MHz
2nd
IF
455kHz
Receiver
sensitivity
....
.
...
.
...
.
.
.
. . .
.
...........
. .
. .
. .
. .
Better
than
0
.5uV
for
30dBS/N
Better
than
0
.2AV
for
12dB
SINAD
Receiver
selectivity
....
.
...
.
...
.
........
.
...
.
. . . .
. .
. . .
"
. .
More
than
12kHz(-6dB)
Less than
24
kHz
(-60dB)
Spuriour
response
..........
. .
. .
.
.....
.
. .
.
........
. .
".
. .
. .
Better than
60dB
Squelch
sensitivity
.
.
.......
. .
. .
...
. . .
.
...........
. .
. .
. .
. .
0
.16,V
(threshold)
Auto
scanstop
level
........
.
...
. .
. .
. .
...
.
........
.
...
.
. .
Less
than
0
.2'UV
(threshold)
Audio
output
..........
..
...........
. .
. .
. .
...
.
....
.
...
.
......
More
than
2
.0
watts
across 8
ohm
load
(10%
dist
.)
Note
:
Circuit
and
ratings
are subject
to
change
without
notice
due
to
developments
in
technology
.
pIM
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1-1
Interconnection
Connect
the
antenna
and
power
supply
as
shown
in
Fig
.
1-1 for
fixed
station
.
1-2
.
MOBILE
Installation,
[general]
"
Installation
location
Using
the supplied
mounting
bracket,
install
the
transceiver
under
the
dashboard
or
on
the
side
of
the
console
in
your
car
.
Mount
the
unit
for
safe
operation
:
easy
keyboard
access,
and
display
visibility
.
Refer
to
Fig
.
1-2A
and
Fig
.
1-2B
.
If
your
car
is
equipped
with
an
electronic
fuel
injector,
the
transceiver
should
be
as
far
from
the
control
equipment
as
possible
.
Antenna
installation
Various
types
of
antenna
for
2
meter
mobile
operation are
available
.
(See
Fig
.
1-2C)
NOTE
:
For
gutter-mount
installation,
the
antenna
bracket
must
be
grounded
to
the
car
body
as
shown
in
Fig
.
1-2C
.
Affix
the
antenna
securely,
referring
to the
antenna
instruction
.
For
mobile
antenna
installation,
seepage
6
.
nnector
~ l
""T
oc
i3
ev
l
l
u
rrr
I~
''
~~
fff
ANT
terminal
0
BACK
VP~
00
E
%T
.
SP
h
I
IIII llllllllnl~l
~
~J
SP-40
Mobile
station
operation
l
DC
power
terminal
w
l
Connect
battery
to
DC
power
terminal
.
For
detailed
instruction,
see
page
6
.
Red
Fuse
Black
Fig
.
1-1
Antenna
and
Power
Supply
Connections
Coaxial
cable
o
U
H
F
type
c
Fixed
station
operation
"
Power
supply
Connect
the
supplied
power
cord
with
fuse
directly
to
the
battery
terminals
.
Connecting
to the
cigarette
lighter
socket
can
cause
a
poor
connection,
and
excessive voltage
drop
.
"
Ignition
noise
The
transceiver
is
designed
to
suppress
ignition
noise
;
however,
if
excessive
noise
is
present,
it
may
be
necessary
to
use
suppressor
spark plugs
(with
resistors)
.
Regulated
power
supply
(10A
or
morel
O+
(3
KPS-12
AC
120V
IM
BC-1
(120V
AC)
009-0008-05)
1-3
.
FIXED
STATION
Installation,
[general]
"
Power
supply
(Fig
.
1-3)
A
regulated
DC
power
supply
(13.8V
DC,
10A
or
more)
is
required
.
"
Antenna
(Fig
.
1-3)
Various
types
of
fixed
station
antennas
are
commercially
A
.
Installation
position
-T
Under
driver's
seat
I
Underside
of
dashboard
The
transceiver
should
be
away
from your
knees
.
C
.
Antenna
Installation
Gutter-mounted
,
whip
antenna
Remove
the
paint
to
insure
grounding
to
the
car
body
.
Roof-top
system
Roof-side
system
Front
fender
Drill
holes
in
the
bottom
of
dashboard
.
Secure the
mounting
bracket
with
screws
and
nuts
.
Trunk
lid
system
Be
sure
to
use a
2m
mobile
antenna
.
Fig
.
1-2
Installation
for
Mobile
Operation
available,
Select
your
desired
antenna
according
to
your
in-
stallation
space
and
application
.
Note
that
the
SWR
of
your
antenna
should
be
less
than
1
.5
.
A
high
SWR
will
cause
the
TR-7850
protective
circuit
to
operate,
reducing
the transmit
output
power
.
Insert
the
transceiver
into
the
mounting
bracket
.
D
.
Coaxial cable
connections
*
Insert
through the bonnet
.
Battery
*
Connect
Directly
to
the
battery
terminals
.
Nut
B
.
Installation
of
mounting
bracket
Body
Install
the
mounting
bracket
.
Move
the
lever
down
to
secure
the
transceiver
.
TR-7850
Adjust the
installation
angle
and
fully
tighten
4
bolts
using
the
hex
wrench
.
* Pass through
the
door
fitting
.
The
cable
can be
inserted
easily
if
the door cushion
soft
.
Note
that
rain
water
may
enter
along
the
cable
.
Lift
the
trim
plate
and
install
the
cable
.
Coaxial
cable
To
antenna
1-4
.
Back-up
Power
1
.
With
power
supplied
directly
from
the
car
battery,
the
micro
computer
continues
operating
even
when
the
power
switch
is
OFF
.
Current
drain
is
very
low,
approximately
2
.5
mA
.
2
.
If
you
wish
to retain
the
memories
even
when
moving
the
unit
between
the
car
and
the
fixed
station,
utilize
a
battery
back-up
system
.
Othefwise,
all
the
memories
are cleared
when
the
power
cord
is
disconnected
.
[Battery
Back-up]
(1)
Use
four
AA
NiCd
batteries,
available
Locally
.
(2)
Open
the
lower cover
of
the
transceiver
.
(3)
Install
the
batteries
into
the
battery
case
located
on
the
left
side,
making
sure that
polarity
is
cor-
rect
.
(4)
The
batteries
are
charged
regardless
of the
power
switch
position
.
Charging
current
is
about
15
mA
.
The
battery
back-up
function
operates
only
when
the
power
cord
is
disconnected
.
3
.
Back-up
is
available
for
about
3 to 5
days
.
To
extend
the
back-up
period,
connect
the
(optional)
BC-1
to
the
external
back-up
terminal
.
INOTEI
1)
Remove
the
batteries
if
you
don't intend
to use
them
for
a
long period
of
time
.
1
.
Power
supply
connection
Regulated
power
supply
SP-120
KPS-12
TR-7850
Yagi
antenna
(stacked)
Fig
.
1-3
Installation
for
Fixed Station
Operation
Regulated
DC
Standard
voltage
:
13
.8V
DC
power
supply
2
.
Connection
of
Current
capacity
:
More
than
10A
another
DC
source
.
NOTE
:
F____1I
-
II
Preferably,
voltage
should be
'
adjustable
between
12v
and
16V
DC
.
The
regulated
supply should
be equipped
with
a
built-in
protection
circuit
for
both
Antenna
installation
overcurrent
and
overvoltage
.
(example)
CAUTION
:
Battery
charging
power
supplies
Transceiver
performance
cannot be used
.
depends
largely
on
the
type
of
antenna
used
For
fixed
station
operation,
there
are
gound
plane
antennas
Rla
(omni-directional)
and
Yagi
antennaeguar
antenn
Fig
.
1-4
Battery
Back-up
(uni-directional)
.
The
Yagi
antenna
is
suitable
for
long
distance
T
operation
(D^)
or
communication
i
(11=1
\\owe
r
with a
specific
party
(having
excellent
directivity
and
high
gain)
.
An
omni-directional
antenna
is
generally
used
for
local
I
M
M
F
-
.
--
FA
M
.j/
91
operation
.
Regulated
power
supply
TR-7850
It
is
convenient
to
install
both
Yagi
and
ground plane antennas
for
selectable
use
.
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SECTION
2
.
CONTROLS
AND
TERMINALS
111111
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1,1111
.
.,1111
.
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1"
1X111
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1111
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I
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111
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111111
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.
2-1
.
Front
Panel
1
.
VOL/POWER
2
.
SQUELCH
3
.
TX
Shift
Indicator
Power
ON-OFF
switch
andvolume
control
are
combined
.
Turning
the
control
fully
counter
clockwise
will
turn
the
power
OFF
.
Clockwise
rotation
will
increase
the
volume
.
In
the
power
OFF
position,
about
2
.5mA
current
is
drawn
to
back-up
the
micro-computer
and
about
6mA
of
leakage
cur-
rent
for
final
module,
provided
the
power
cable
is
connected
to a
constant
power
source
.
To
completely
disable
the
transceiver,
disconnect
the
power
cable
.
The
squelch
control
is
used
to
eliminate
noise
during
no-sig-
nal
time
.
Normally,
this
control
is
adjusted
clockwise
until
the noise
disappears
and
the
BUSY
indicator
goes
off
(threshold
level)
.
For
scan
operation,
this
control
must
be
set
to
the
threshold
point
.
+
(RED)
:
By
pressing the
O
key
on the
keyboard
(11),
the
indicator
will light,
indicating
that
transmit
frequency
is
switched
up
600
kHz
from
the
receive
frequency
.
4
.
Frequency
Display
5
.
BUSY
Indicator
6
.
S/RF
Level
meter
S
(YELLOW)
:
By
pressing
the Os
key
on
the
keyboard
#(11),
the
indicator
will
light,
indicating
that
the
transceiver
is
operating
in
the
simplex
mode
.
-
(RED)
:
by pressing the
O
key
on
the
keyboard
#(11),
the
indicator
will
light,
indicating
that
transmit
frequency
is
switched
down
600
kHz
from
the
receive
frequency
.
This
LED
frequency
display indicates
the
operating
frequency
in
4
digits
(MHz-kHz)
.
Example
:
146
.940
MHz
is
indicated
as
"6
.940"
.
This
lamp
will
light
when
the
squelch
is
open
in
receive
mode
.
This
LED
level
meter
indicates
receive
input
signal
strength
(in
S
units)
or
transmit
output
(1317)
.
7
.
ON
AIR
Indicator
A
light
emitting
diode
(L
.E
.D)
will
light
during transmit
mode
.
8
.
CH
Indicator
This
indicates
the
channel
No
.,
0
through
14,
in
2
digits
.
9
.
HI/LOW
Switch
This
switch
is
used
to
set
transmit
output
power
to
either
40W
(high) or
low
power
(1
to
15W)
.
Power
is
high
at
the
normal
out
position
(JEL),
and
is
low
at
the
in
position
(_)
.
(refer
to
Page
13)
10
.
MIC
Connector
(6-pin)
For
connection
of
the supplied
microphone
.
MIC
connector
from
FRONT
PANEL
(lead color)
11
.
Keyboard
The
keyboard
has
the
following
functions
(Refer
to
"SECTION
3
.
OPERATIONI
:
0
O
(Number
keys)
:
Depress
four
keys
to
set
the
desired
operating
frequency
.
a
(+
shift
key)
:
The
transmit
frequency
will
be
offset
600
kHz
up
from
Depress
this
ky
and
the
transceiver
will
remain
in
simplex
.mode
(transmit
and
receive
frequencies
are the
After
setting
the operating frequency,
depress
this
key
.
CM
(Simplex
key)
:
O
(-
shiftkey)
:
After
setting
the operating
frequency,
depress
this
key
.
The
transmit
frequency
will
be
offset
600
kHz
down
from
the
receive
frequency
.
M
7-
This
is
used
to
input
the desired
frequency
(including
.0
"
kHz
offset)
to
each
channel
for
memory
.
Press
the
key
and
a
check-tone
will
be
heard
.
-
-
.
"-
keys
is
cleared
.
When
cleared,
the
frequency
display
will
indicate
the
frequency
that
was
displayed
before
-
"
mistakenly
entered
setting
this
key
is
also
used
to
operation
.
release
the
scan
Example
:
Depress
the
©
,
g0
,
®
and
M
keys
.
The
frequency
display
will
indicate
"6
.940"
(146.940
MHz)
.
The
number
keys
function
as
auto-patch
keys
during transmit
mode
.
14
.
STEP
Switch
15
.
REV
Switch
0'
(Scan
key)
:
This
is
used
for
scan
operation
.
Press the
key
when
the
SQUELCH
(2)
is
ON
.
This
will
start
auto-scan
or
memo-
ry-scan
depending
on the
position
of
the
KEY/M
.
SEL
switch
and
STEP
switches
.
Auto
Patch
:
During
transmission,
keys
.
1
-
9, *
and
#
operate
DTMF
.
KeysM
M]
M
a)
will
operate
fourth
column
in
conjunction
with
the
REV
switch
.
12
.
KEY/M
.
SEL
Indicator
This
indicates
the
position
of
the
KEY/M
.
SEL
switch
.
The
KEY
indicator
will
light
when
the
switch
is
depressed
(_),
and
the
M
.
indicator
will
light
in
the
out
position
(,
)
.
13
.
KEY/M
.
SEL
Switch
This
switch
is
used
to
select
the
method
of
setting
frequency,
either
by the
keyboard
or
the
memory
.
In
the
(-),in
position,
the
operating
frequen-y
is
set
by
the
keyboard
;
in
the
normal
out
position
(
Z
),the
operating
frequency
can
be
set
by
using the
MEMORY
channel
selector
(16)
.
Use
this
switch
to
select
the
steps
0111111IL
:
10
kHz,
.
:
5kHz)
during
frequency
scan
or
microphone
UP/DOWN
operation
.
In
receive,
this
switch
is
used
to
reverse
the
repeater
shift
(±600
kHz)
and
other transmit/receive
frequencies
(CH
0,
14)
.
It is
a
momentary
non-locktype
switch
and
returns
to
the
normal
out
position
when
released
.
In
transmit,
this
switch
shifts
DTM
F
tones
on
column
3 to
column
4
(ABCD)
function
.
16
.
MEMORY
Channel
Selector
This
switch
is
used
to
select
one
of
15
memory
channels
.
Of
these,
channels 1-13
store
frequencies
including
±600kHz
offset
.
The
other
two
channels,
1
and
14
are
"ODD
slit"
channels,
storing
transmit
and
receive
frequencies
individually
.
Channel
"O"
is
the
priority
channel
.
17
.
PRIORITY
ALERT
Switch
This
switch
is
used
to
check
the
priority,
channel
"0"
.
Depress
the
switch
and
the
priority
channel
will
be
checked
at
about
a 6
second
interval
regardless
of the
KEY/M
.
SEL
switch
position
.
A
tone
sounds
when
the
priority
channel
is
in
use
.
18
.
PRIORITY
OPER
Switch
This
switch
is
used
to
call-up
the
priority
channel
"0"
.
By
depressing
the switch,
operating
frequency
is
switched
to
the
priority
channel
.
19
.
TONE
Switch
2-2
Rear
Panel
24 15
The
tone
switch
is
for
control
of
a
user-supplied
tone
generator
(not
available
from
TRIO-KENWOOD)
.
21
.
DC
Power
Terminal
DC
power
input terminal
.
Connect
the
supplied
power
cord
with plug
.
Input
voltage
is
13.8V
DC
.
Observe
plus
(
+
)
and
minus
(
-
)
polarity!
22
.
EXT
.
BACK-UP
23
.
EXT
.
SP
Terminal
24
.
DWN
Switch
25
.
UP
Switch
.
20
.
ANT
Terminal
26
.
PTT
Switch
External
power
back-up
terminal
to
retain
the
memories
.
For
internal
back-up
operation,
install
four
AA
NiCd
batteries
in
the
built-in
battery
case
.
Use
this
terminal
to
retain
the
memories
for
a
long
period
of
time
(more
than
1
week),
or
with
the
power
cord disconnected
.
External
speaker
terminal
.
Connect
an
8
ohms
speaker
using
the
supplied plug
.
This
switch
is
used
to
step
the
operating
frequency
down
during both
keyboard
and
MEMORY
Channel
operation
.
When
pressing
the
switch,
a
tone
will
sound
.
When
the
UP
or
DWN
switch
is
held
on,
frequency
shifts
rapidly
.
Pressing both
the
UP
and
DWN
switches
simultaneously
results
in
stopping
the
frequency
control
operation
.
This
switch
is
used
to step
up
the
operating
frequency
in
both
keyboard
and
MEMORY
channel
operation
.
When
pressing
the
switch,
a
tone
will
sound
.
Antenna
terminal
.
Connect
an antenna
of
50
ohms
Press-to-talk
switch
used
for
transmission
.
This
will
also
impedance
.
release
scan
operation
.
10
MINI
"
rX
.+MNrn
.
N
"
MNnM
.
nX
.
",
XHr
.,
XNnMNr
"
NNInrNNnH
.
. . .
.
.
.bMIHnXIIn
,
INIe
.
.
. . .
.r
.Nr
"
MNrn1lNr+llNr
"
rXllnnrHwIlIlr
"
.IH
"
,X
.nNINn111N
"
rNXnrXHn
.
.aNHnMNr
"
rN
.nN
.
"
,N
.aNIH
"
,NIIraX
.nNIN
"r
.Ir
"
.IIrnHIIr
"
rN
.
"
rN
.
"r
.N
"
rIXN
"
NIIIr
"
rXN~
SECTION
3
OPERATION
"
rINN
"
rNNr+XINnNIIr
",
NII
,"
rN
1
Hn
.
. . .
.nMllr
"
,
NINnX14+Npn1lNr
.llr
.,
NNr
"
Mllr
"
MNn
,
llllr
",
Nllr
"
rXHr
"
HIIIr+1111w111Hn1111rnHllr
"
,INIr
",
.Nnllllr
"
Hlllr
"
n111nMIH
"
HIIIrn111Nn11WnNllr
"
r
.
"
,IIIIrnNllr
"
,XIN"
MNr
"
r11XnMllr
"
MNnMNr
.rNIN+INN+NNraNNr
"
rINN
"
NINr"
3-1
General
2
.
3
.
4
.
5
.
This
transceiver
uses
a
PLL
synthesizer
controlled
by
micro-computer
.
The
operating
frequency
can
be
shifted
in
either
5
kHz
or
10
kHz
steps
.
The
transceiver
covers
a
wide
frequency
range
of
143
.900
to
147
.995
MHz
(which
includes
some
MARS
frequencies)
.
Operating
frequencies
can
be
set
by
simply
pressing the
keys
on
the
keyboard
.
Frequencies
can
also
be
stored
in
the (15)
memory
channels
.
Transmitter precautions
(1)
The
TR-7850
antenna
impedance
is
50
ohms
.
Be
sure
to
connect
an
antenna
of
50
ohms
impedance
.
(2)
Check
the
transmit
frequency
before operating
to
insure
that
you
do
not
interfere
with
other
stations
.
(3)
By
pressing the
microphone
PTT
switch,
the
TR-7850
is
set
in
transmit
mode
;
the
ON
AIR
indicator
will
light
and
the
meter
indicates
transmit
power
.
Hold
the
microphone
about
5
cm
from
your
mouth
and
speak
.
Micro-Computer
Reset
(At
first
power-up)
If,
at
initial
TURN-ON,
an
erroneous
or
incorrect
read-
out
is
displayed, reset
the
MICRO-COMPUTER
.
This
is
not
an
equipment
malfunction
.
(1)
Disconnect
the
power
plug
from
the
DC
power
terminal
(21)
and
after
about
five
seconds
recon-
nect
the
power
plug
.
Turn on
the
power
switch
(1)
.
(2)
BACK-UP
BATTERIES
INSTALLED
First
remove
the
batteries,
and
reset the
MICRO-COMPUTER
as
previously
described
.
Reinstall
the
batteries
.
3-2
Memory
Input
The
TR-7850
has
two
different
memories
;
normal
memory
and
split
channel
memory
(including
priority
memory
channel)
.
1
.
Normal
memory
(CH
1-13)
Example
:
To
store
146
.940
MHz
(-
600
kHz
shift)
in
CH
5,
(1)
Set
the
KEY/M
.SEL
switch
to
the
KEY
position
(2)
Set the
MEMORY
channel
selector (16)
to the
CH
5
position
.
(3)
Enter
the frequency
.
a)
b)
c)
d)
Press the
Press
the
Press
the
Press
the
Oo
[DISPLAY]
Frequency
before
input
.
key
(MHz
digit)
.
.
. .
.
........
b
.
key
(100
KHz
digit)
. .
.
....
S
.9
key
(10
kHz
digit)
.
...
.
...
.
6
.9
Lf
key
(1
kHz
digit)
. .
.
...
.
...
.
I59
1
4
0
(Simplex
operation)
(4)
Input
the
shift
mode
.
Press the
=
key
(the
indication
changes
from
to
"
-
,
.)
.
(5)
Store the
frequency
in
the
memory
.
Press
the
0
key
.
A
tone
will
sound,
indicating
data
entry
.
Change
the
channel
and
input other
frequencies
in
the
same
manner
.
Notes
:
(MEMORY
input)
a
.
To
input
MHz
digits,
use
the 3
through
8
keys
.
b
.
When
the
MHz
digit
is
3,
use
only the
9
key
to
the
input the
100 kHz
digit
.
c
.
When
a
wrong
frequency
is
input
in
error,
press
the
©key
to
clear
the
frequency
.
The
frequency
display
will
indicate
the
previous
frequency
before
the
last
input
.
Reenter
the
correct
frequency
by
again
pressing the
keys,
starting
with
the
MHz
digit
.
d
.
When
the
1
kHz
digit
keys
(M-®)
are
pressed,
the
frequency
display
indicates
U'
.
When
the
(CM-CM)
keys
are pressed, the
display
indicates
S
e
.
Do
not press
any
other key
until
the
correct
fre-
quency
is
input
.
The
transceiver
holds
the
previous
frequency
until
the
new
frequency
is
input
.
Notes
:
(GENERAL)
1
q
If
you
wish
to
change
the
shift
mode
from
simplex,
press the
shift
key
for
the desired
offset
.
2
.
For
frequencies
outside the
144
.00
-
174
.995
MHz
amateur
band,
the
transceiver
operates
in
simplex
mode
independent
of
the ~+
or F-
-~
keys
.
3
.
When
the transmit
frequency
is
offset
(±600
kHz
and
is
outside the
amateur
band,
the
transceiver
will
operate
thusly
:
Press the
=
key
:
Shift
mode
is
indicated
.
Press the key
:
Indication
Frequency
is
out-of-band
and
is
not
stored
in
memory
.
(Tone
does
not
sound
.)
Transmit
:
Mode
changes
to
simplex, pressing
the
PTT
switch
.
(Tone
sounds
at this
time
.)
Receive
:
Remains
in
simplex
mode
at
PTT
release
.
The
simplex
frequencycan
now
be
memorized
.
2
.
Split
channel
memory
(CH
0,
14)
Example
:
To
store
146
.580
MHz
receive
and
147
.660
MHz
transmit
in
CH
14,
proceed
as
follows
:
1
.
Set
the
KEY/M
.SEL
switch
(13)
to
the
KEY
position
2
.
Set
the
memory
channel
selector (16)
to
CH
14
.
3
.
Enter
the
receive
frequency
.
Frequency
before
input
a)
Press the
©
key
(MHz
digit)
. .
.
.......
.
5
.
b)
Press the
(]
key
(100
KHz
digit)
...
.
6
._5
c)
Press the
©
key (10
kHz
digit)
......
.
SSH
d)
Press the
QD
key
(1
kHz
digit)
........
.
5
.SH0
Note
:
For
frequency
input
precautions,
refer
to
"Notes"
in
the
preceding
section
.
(4)
Store the
receive
frequency
in
memory
.
Press
the
(]
key
.
A
pulsed
tone
will
sound,
indicating
transmit
frequency
is
ready
to
be
accepted
.
N
ote
:
1
.
The
tone
will
sound
intermittently
until
the
transmit
frequency
is
stored
in
memory
.
2
.
When
the receive
frequency
is
stored,
transmit
frequency
before the
split
(CH
14)
is
indicated
.
(5)
Enter
the
transmit
frequency
.
a)
Press
the
O
b)
Press the
c)
Press the
d)
Press the
(6)
Store the
transmit
frequency
in
memory
.
Press
the
M)
key
(tone
stops
.)
.
...
.
...
.
. .
. .
. .
6
.5H"
The
transceiver
is
now
ready
for
split
frequency
operation
.
Set
the
KEY/M
.
switch
(13)
to
the
M
.
position
()
.
NOTE
:
After
the
transmit
frequency
is
stored,
the
frequency
display
indicates
the receive
frequency
previsouly set by
step
(3)
.
3
.
Memory
channel
operation
With
the
KEY/M
.SEL
switch
in
the
M
.
position
(Z)
.
the
transceiver
operates
on
the
frequency
set
by
the
MEMORY
channel
selector
(16)
.
4
.
Changing
memory
frequencies
.
If
you
wish
to
changeany
memory
frequency, store a
new
frequency
in
that
channel
using the
above
proce-
dures
.
The
old
frequency
is
erased
when
the
new
frequency
is
stored
.
3-3
SCAN
(Busy
stop)
Operation
key
(MHz
digit)
.
...
.
. .
.
...
.
key
(100
kHz
digit)
.
...
.
.
?
.IS
key
(10 kHz
digit)
.......
.
i
.S5
key
(1
kHz
digit)
. .
.
......
1.6
SL
The
SCAN
operation
is
devided
into
keyboard
scan,
memory
scan
and
priority
channel
scan
.
For
SCAN
operation,
the
squelch
control
should
be
advanced
to
the threshold point
.
See
section
3
.7,
Squelch
.
1
2
"
KEYBOARD
SCAN
1
.
Set the
KEY/M
.SEL
switch
(13)
to
the
KEY
position
(_=5_)-
2
.
Depress
the
ED
key
.
Scan
starts
automatically
in
10
kHz
or 5
kHz
steps
depending
on
the
position
of the
STEP
switch
(14)
.
3
.
When
a
signal
is
present,
scanning
stops
.
Scan
restarts
automatically
after
about
5
seconds
.
4
.
To
release
the
scan,
press the
O
key
(or
the
microphone
PTT
switch
.
"
MEMORY
SCAN
1
.
Set the
KEY/M
.
SEL
switch
(13)
to
the
M
.
SEL
position
.
2
.
Depress
the
sc
key
.
The
memory
channels
are
scan-
ned
.
Scan
stops
and
restarts
the
same
as
in
keyboars scan
.
3-7
SQUELCH
"
PRIORITY
CHANNEL
SCAN
Depress
the
PRIORITY
ALERT
switch
(17)
.
Regardless
of
the
KEY/M
.
SEL
switch
position,
a
tone
will
sound
and
the
BUSY
indicator
(5)
will
light
at
about
6
seconds
intervals
if
the
PRIORITY
channel
is
in
use
.
Traffic
on
the
PRIORITY
channel
will
also
be
mommentarily
heard
.
3-4
PRIORITY
OPER
Switch
To
call-up
the
frequency
stored
in
the
priority
"0"
channel
depress
the
PRIORITY
OPER
switch
(19)
.
3-5
TX
OFFSET
and
REVERSE
After
setting
channel
frequencies
by
the
keyboard,
press the
or
ED
key
.
Transmit
frequency
will
be
offset
plus
or mi-
nus
600
kHz
from
the
receive
frequency
and
the
TX
shift
indicator
(3)
will
display
the
offset
.
By
pressing the
REV
switch
(15),
the transmit
and
receive
frequencies
will
be
reversed
.
If,
at
this
time,
the transmit
frequency
is
beyond
the
amateur
band
frequency, a
tone
will
sound
and
the
transceiver
is
automatically
in
simplex
mode
.
When
the
REV
switch
is
pressed,
the
frequency
indicated
on
the
display
is
also
reversed,
but
the
TX
shift
indicator
(3)
will
not
change
.
3-6
AUTO
PATCH
Operation
With
the
PTT
switch
depressed,
the
keyboses
operates
in
DTMF
.
Tone
signals
will
be
transmitted
for
auto
patch
operation
.
In
transmit,
to
operate
the
fourth
column
(ABCD),had
the
REV
switch
in
and
key the
third
column
(3,
6,
9,
#)
.
To
eliminate
receiver
noise
at
the
no-signal
condition,
slowly
adjust the
squelch
clockwise
until
the noise
disappears
and
the
BUSY
indicator
goes
off
(threshold
point)
.
The
squelch
will
open, the
BUSY
indicator
will
light
and
the
speaker
will
operate
when
a
signal
is
received
.
The
squelch
control
is
also
used
for
scan
operation
control
.
If
the
signal
is
weak
or
fades
during
mobile
operation,
readjust
the
squelch
for
consistent reception
.
3-8
HI/LOW
Switch
For
local
communication,
it
is
recommended
that
power
be
reduced
to eliminate
interference
to
other
stations
and
to
minimize
power
consumption
.
By
pressing the
HI/LOW
switch,
transmit
power
is
reduced
from
40W
to
about
5W
.
3-9
Meter
The
LED
level
meter
functions as
an
"S"
meter
during
reception
.
OneLED
ON
equals
0
dBu,
Five
LEDs
ON
equal
20dBy(+10,
-2
dB)
.
During
low
power
transmission,
3
LED's
will
light
(at
146
MHz),
and
5
LED's
will
light
during
high
power
transmission
.
3-10
TONE
Switch
This
switch
is
provided
to
control
a user supplied
and
instal-
led
tone
encoder
.
TRIO-KENWOOD
does
not
manufacture
or
supply
this
item
.
To
install,
refer
to
Fig
.
3-1
.
3-11
Adjustment
"
Low
Power
The
TR-7850
low
power
characteristic
is
shown
in
Fig
.
3-2
.
Low
power
may
be
adjusted
by
VR4,
shown
in
Fig
.
3-3
.
a
z
w
3
O
a
a
H
O
Deviation
On
the
FIX
unit
X55-1270-10,
VR3
adjusts
mic
deviation,
clockwise
increases
deviation
.
On
the
control
unit
X53-1180-10,
VR1
adjusts
tone
deviation,
clockwise
reduces
tone
deviation
.
20
10
8
6
5
4
3
2
0 .5
TR-7850
LOW
POWER
144
145
146
147 148 149
CARRIER
FREQUENCY
IN
MHz
Fig
.
3-2
3-12
.
Miscellaneous
Information
1
.
Frequency
step-up
at
power
switch
ON
or
OFF
.
"
In
KEY
mode
operation,
the
frequency
may
step
by
one
step,
according
to the
selected
channel
step
.
"
In
memory
mode
operation,
the
channel
number
may
advance
by
one
channel
.
These
are
normal,
and
not
a
mulfunction
.
2
.
Power
consumtion
at
power
switch
OFF
.
The
final
power
amplifier
in
this
high-power
tranceiver
is
fed
directly
from
the
power
source
without passing
through
the
power
switch
.
For
this
reason,
about
6
mA
of
leakage
current
is
consumed
by the
final
section
when
the
power
switch
is
off
.
Backup
current
at
about
2
.5
mA
is
consumed
to
retain
memories
.
If
backup
batteries
are
installed,
charge
current at
about
15
mA
is
also
consumed
.
Fig
.
3-1
1
3
C4-,41
gama
Fig
.
3-3(A)
Fig
.
3-3(B)
yN
...
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-
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NII
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"
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.gnX
"
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XLL
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XLInXllln
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X11
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:_
SECTION
5
.
OPTIONAL
ACCESSORIES
+NN
.
.NN
..XM
".
.NN+NN
."
.NNnMN
.n
.11N+NIInX11N+N11
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.
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The
following
accessories
are
available
for
more
5-3
Charger
BC-1
sophisticated
operation
of
the
TR-7850
.
5-1
Fixed
Station
DC
Power
Supply
KPS-12
The
KPS-12
DC
power
supply
perfectly
matches
the
TR-7850's
design
.
It
incorporates
a
circuit
for
protecting
the transceiver against
shorted
output
and
power
supply
overload
.
5-2
External
Speaker
SP-40
Designed
for
mobile
operation
.
Styling
and
tone
quality
match
the
TR-7850
perfectly
.
This
charger
is
used
as a
Back-up
power
supply
when
the
main
power
supply
is
off
for
extended
periods
.
AA4DF
PLL
UNIT (X50-1650-101
L
Q,,
-
.
TC<001 BP
03
TC4049BP
pllnplln
.IIIIn
.11N
."
.pllP
.Illp
"
x111
.IIip
"
xllP
"
.Illp
"
x1111
"
x111b .N11n
.N111
"
NIIIbMllPx111P
.Illlnxllp
"
.Illlu
.lllna1111'
.Illp
"
.Illln
.111x
"
.1111
.
"
xU
.."
.IIII
.al111nYllln
.1116
TR-7850
SCHEMATIC
xn
.
.nnx
.xxu
.
.wx
.
.pnnxxu
"
n
. . .
.
.."
.nw
".nlu
"
.xnnnnu
"
nnu
"
nnu
"
nnu
.nnu
"
.nx
."
.nnnolu
."
.nn
."
.nne
.
.nxl
.
.nnl .nnl
."
xnu+nn
."
.xn .+nul
.uu
. .
.nw
.awl
r
I
gc
02
~,~~a
al
"T0
S
r=
"""
rlls
~
~
NMI
o
FFFF~
p`
j^I
m11~
cs-
::
:-a
r
.
no
ilipm,
HIM
will
11111
yrs
.
;
".
FI
i
ffgrm
39
!
"""
.
.
.
.
~Wj
. . . . .
.-~
M
ille
r
"
ouoo
"
Ll
11111!
I
I=
MEN
mosm
®III
:==,~
rrr~rr
.
PRO
LIFT-lFI3II7
~i2II117
111111
EWE&I
G7ii
swm
mm-
~uii
Eooe1
MULE
ENCODER
UNIT
()(5!-1500
.
10)
Nunn
mu
'I
e
c
o1~0
""-
.I
11
~9i
F
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3,9
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12
:
2SC460181
a
OS
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06,T
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O(GRI
6
zs'1775111
Oq
:7'50
:1'
0
.>
TCSOB2P-GL
Q16
ITC9122P
J
FIX
UNIT
(%55-1270-101
DT
ofi
Dn
I15V505
,2,7
.1525
:
:
D"
:15516
D!
152208
L81
"
09
PPR5532
Y5532K
TL
B
"
135
TL_"
TL
.
:,"
IIIn1111N
"
11111nI1181
"
I111N
"
NIIIIn1111w1111n11111m1IIIn111111
"
NI111
"
11111nNIIIn11111b1111N
"
g11W
111111
"
11111nNlllnN1111
"
N1111
"
IIIIII
"
Nlllntllllnlllllt
"
111111
"
IIINnI1111nN111n1111N
"
Illll
y
CHEMATIC
DIAGRAM
IIN
"
q8nI11111nN111
"
IIUII
"
11811
"
IIIIIbM111
"
NIIInI111IbIlllN
"
NIIInNlllt
"
11111nO111I
"
Np1I
"
NIIIn1N11
1
"1
1111
1"1
11INn11
1N
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111
n
1
N
11
nNliN
"I
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n1N
111
"
11
II/
I"I
NII
I"I
N
I
I
I
"
I
NII
I"
p
1II1
"
1NII1'
"
PI
GL
01
:18V505
0
:,!
:152588
DI
:15516
D5
1152206
-
l
.J
IL81409
01,3,5
:PR5532K
D2
,0
:PY5532'
De
TL
4131
D7
ITLR323
De :TLM8051
2
01,3,lJ
135K701L) 029
125C224o(GR)
03-11,31,32
'
.250060181
030 ITA7061AP
prs,u
12601775161
033,30:25K611GRI
01
"
-16,18,19,25,26
:25C1815(Y)
OJ6
:23L2538-22-
A
017,21
:2541015(7)
020
:NA1366N
021,27
'.
P
PLlVN
023
25Aa961Y)
020
25L096(T)
M
+4y
M
5
-
7-7
.
:2-
(v
M
TR-7650
(K)
01,
2,1-10
:N
60
D!
"
6J2,10,K,2S
:151555
Ua
Is
.
2
01J
:KZ-088
017
:%2-060
D1e
:XZ-070
019
V06B
D20
.21
:152208
013,22-20
: 1
TT410
N"
NNIbO1Nn
.1111.".1111
.
"
XIN
.+IINbM11b
.XIN+NN
.nNW
"
.NNnMNn
.NIp
"
.Mlp
"
,NW
"
XN1
."
.Illp
"
OINnM11n
.1111n
.1111
.npN
"
MIIn
.IHIbM11nM11n
.111W
.Np
."
MILnHX
.n11NnM11n
.1111n
.IHN
"
MNbM11nN111
.".IIIIb
.1111nMIN
".IIIIn
.INIb
.NNmNIpnXHb
.11nM
.....
1n
.NIF
"
.NN~
BLOCK
DIAGRAM
p11n
.XH
.
"
.N11b
.NIInM11nXMnHllp
"
.NXn
.M1lnMlp
"
.1,NnMNFOlIIb
.IINn
.Illln
.IlllmllX
.".1111n
.1111
."
.1111
."
.IllImIIIU
"
.1114
".H,1 .".
,Ib
.X11
.
".1111."
.IIIU
"
.111,
.nNpw1111
.+,Illmplln
.1111
."
.IIH
."
.11pw1110
"
.1111
."
.11
.
"
.M11b
.111M
"
.Nlp
"
N
"1111 "
HII
o
r
of
~I
Z
I
ffi
5
to
to
A
product
of
Model
TR-7850
Serial
No
.
Date
of
Purchase
Dealer
TRIO-KENW000
COMMUNICATIONS,
INC
.
1
1 1
1,
West
Walnut
Street,
Compton,
California,
90220,
USA
TRIO-KENWOOD
CORPORATION
17-5,
2-chome,
Shibuya,
Shibuya-ku,
Tokyo,
150,
Japan
TRIO-KENW000
COMMUNICATIONS,
GmbH
D
6374
Steinbach
TS
.
Industriestrasse
8A,
West
Germany
TRIO-KENW000(AUSTRALIA
)PTY
.
LTD
.
30
Whiting
Street,
Artarmon,
Sydney
N
S
W
Australia
2064
©15102
PRINTED
IN
JAPAN
B50-3901-00
(K)
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