Kenwood Tr-7850 User manual

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ACCESSORIES

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2

FEATURES

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3

SPECIFICATIONS

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4

SECTION

1

.

INSTALLATION

1

.1

Interconnection

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5

1

.2



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

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Rear

Panel

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10

SECTION

3

.

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

3

.7



SQUELCH

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12

3

.8

HI/LOW

Switch

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12

3

.9



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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...

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...

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...

.....

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...

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...

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.....

. .

.1

piece

(2)Mounting

Bracket

Mounting

parts

:

Hex

wrench

(wo1-0401-04)

. .

.....

.

.....

. .

...

1

piece

Nuts

(5

mm

diameter)

(N

14-0510-04)

.

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.....

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...

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.....

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....

...

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4

pieces

Hex-socket

screw

(N09-0008-04)

...

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...

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.....

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...

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.....

.

....

.4 pieces

Flat

washers

(6

mm

diameter)

(N

15-1060-46)

...

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....

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....

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...

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....

...

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....

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...

4

pieces

Spring

washer

(6

mm

diameter)

(N1

6-0060-46)_

.

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...

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.....

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......

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...

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...

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...

4

pieces

(3)

Feet

Rubber

foot

(small, rear)

002-0069-05)

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...

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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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...

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...........

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............

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......

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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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...

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....

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...

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.1



piece

(9)Warranty

card

.

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...

1

copy

(10)

Instruction



manual

.

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...

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....

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....

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...

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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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. . . . . . . . . .

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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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14,1

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..

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..

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2

-



SPECIFICATIONS

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-



.. ... .. ..

NY

.

.x11

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.. .11.1. ....1..

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...".1..

..

[General]

Semiconductors

.

...........

.

...

.

...

.

...

.

...

.

...

.

...

. .

. . . .

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

.

...

.

............

.

. .

......

. .

...........

.

............

.

...

FM

(F3)

Antennaimpedance

.

.......

.

...........

.

............

.

...

50

ohm

Power

requirement

.

...

.

...

. .

.

....

".

. .

"

...

.

...

13

.8V

DC

±15%

Grounding

......

.

...

.

...

.

...

.

....

.

. .

.

. . .

.

. . . .

.

....

.

. .

Negative

Operating

temperature

.

....

.

...........

. .

...

.

. .



-

20°C

to

+50

1

C

Current

drain

...

.

. .

...

.

...

.

...

.

...........

. .

...

.

. .

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

.rNXr

"

rXllr

"

Nlllr

"

NNIrMIb

"

rWb

"

MYwrNllr

"

rXlb

"

XINnMIp+IIIbnNNnrllNr

"

rN11nrIN1nNIYnrYllr

"

MIF+YIIrn

11

Yr

.

MIIr

"

pN

n

MN

nr111

P"N

INr

"

r11Nr

"

rllllnMllraNINn11Xr

"

rlNp

"

rNllr

"

NINnMP+NlIr

.r

.

..

.

.brXllr

"

rYXr+Npl

"

rNpr

"

NIIImNIb

"

N1Nr

"

rNlb

"

rXNraNNr+Illlr

"

NII

!i=



S

ECTI

O

N

1



INSTALLATION



°-

_

-

"

M

IN

a

Np

r+

Ylr

r

"

r

Xpr

"

NIIN

"

NIIp+NWINIrnXNbp11F

"

nNIF

"

rNlb

"

rNpr

"

r1XM+p11nr1111nr11Nnr1111rdNNnO111ra1111rnMIN

"

r111bn111

1

nr

1111

rnNllr

"

rlrlb

+

llll

w

lllb

"r

Nl

b

"

nNNr

"

rNNO

"

,INF

"

rpNbNINV

"

rNNr

"

rNIbaNNrrlllb

"

NIIIr+INIr

"

Mllr

"

r1111nrNllr

"

Mllr

"

rX11nrNNr

.rlllb

"

rlNlr

"

rlllb

"

rX1H

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

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

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

.

11IIIN+IINI

"

M,IbM11bNl,lm



,InNINnIIIIInM,Inl,Illnl,1111

"

1X11n111



nN11N

"

111,11

"

,,Il1w1111,

"

p11XaX,Inl,Illn11111,

".



,Ibllll,nll



pnl



,n11111, "

,1111,

"

,1



,np,l,l

"

01111

"

Nllln

.



1"

IN,IU111,In11111np



1"

1111

"

p,l

"111, "11



"11

SECTION

2

.

CONTROLS

AND

TERMINALS

111111

.X111

,.111

IN11IIN,11

"

1X111

.1X111 "

1,1111

.

.,1111

.

.11



1"

1X111

"

1,1,11

"1,111." 111.

"

1



.".



,11

"1,1



."

.1



,."

.1



1..11,,1

.

"



1111

.,11111

.1111,

."

.,1



1".1,1,1"

I

N

111

"

111111

"111



.

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

Kenwood TR-7850 User manual

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