Kenwood TM-721A User manual

GOO/MNA»

144/440MHz

FM

DUAL

BANDER

IM-721A

144/430MHz

FM

DUAL

BANDER

IM-721A

TM-721E

INSTRUCTION

MANUAL

KENWOOD

CORPORATION

Thank

you

for

purchasing

this

new

transceiver.

IMPORTANT:

Please

read

this

instruction

manual

carefully

before

placing

your

transceiver

in

service.

SAVE

THIS

INSTRUCTION

MANUAL.

CAUTION:

Long

transmission

or

extended

operation

in

the

HI

power

mode

might

cause

the

rear

of

this

transceiver

to

get

warm.

Do

not

piace

the

transceiver

where

the

heat

sink

(rear

panel)

might

come

in

contact

with

plastic

or

vinyl

surfaces.

The

following

explicit

definitions

apply

in

this

manual:

Note

2

If

disregarded,

inconvenience

only,

no

risk

of

equipment

damage

or

personal

injury.

Caution

:

Equipment

damage

may

occur,

but

not

per-

sonal

injury.

illustrations

show

the

TM-721A.

CONTENTS

PWN>

INSTALLATION

INSTRUCTIONS

..............00008

OPERATION.........:ccccccecnsccescncsarectsaseceascees

OPERATING

CONTROLS

RECEIVER

OPERATION.

..ccsccccescacccesscusccensces

Reception

Frequency

Selection

....ccccccsreccssenccnvecscccae

Frequency

Step

Selection........ccccsssncceeesace

A.B.C.

(Automatic

Band

Change)

.......sesssees

Beep

Tone

TRANSMITTER

OPERATION

......ccccccssactecceees

REPEATER

OPERATION

......cccessesecccsscccesecees

Transmitter

Offsets

Reverse

Function

Tone

Operation

Autopatch

(U.S.A.

version

only)

..cccsseoesseeoes

MEMORY

.....ccccecscctecsccuccscuvesscevorseeeentscces

Microprocessor

Memory

Back-up

Microprocessor

Initialization

Memory

Channel

Memory

Contents

Memory

Entry

.....cccscsecesccunnsscenccerscceueres

Simplex/Normal

SHIFT

Qdd

Split

Channel

Call

Channel.......cecccccsecccsestsecsscernacses

Memory

Recall

Memory

Shift

Scan

Options

Programmable

Band

Scan/Band

Scan

Memory

Channel

Scan

Hold

Resume

Programming

Priority

Alert

.......scccececesceseccrscentcsvercenses

27

Memory

Channel

Lockout

BLOCK

DIAGRAM

and

SCHEMATIC

DIAGRAM

77°77"

another

sheet

MAINTENANCE

...........00.0cecsnsecsseccsceressensens

28

In

Case

of

Difficulty

..........cccecescsscesesseeneneeee

29

OPTIONAL

ACCESSORIES.............0:c+ececceceas

31

CTCSS

unit

TSU-6

(U.S.A.

version)

.....cccsenseees

33

REMOTE

CONTROLLER

RC-10.........0sesenccseeee

34

REFERENCE

.............ccscesceeseecccscvcvccecnsvrscres

37

1.

BEFORE

OPERATION

Safety

precautions

The

power

requirement

is

13.8

VDC.

Never

remove

the

case

unless

instructed

to

do

so

in

this

In-

Never

attempt

connection

to

a

24

VDC

source.

struction

Manual.

If

the

internal

parts

are

touched

acciden-

tally,

a

serious

electric

shock

might

occur.

Never

touch

internal

parts.

DC

Power

Supply:

Touching

the

power

plug

when

your

hands

are

wet

may

result

in

a

serious

electric

shock.

.

_ .

~\Gnv”

If

a

metal

object,

such

as

a

hair

or

a

needle,

comes

into

na

\

contact

with

the

power

socket

on

the

rear

panel,

a

oT.

Never

touch

with

wet

hands.

dangerous

electric

shock

may

result.

Never

permit

children

|

ON

to

put

anything,

especially

metal

objects,

inside

this

unit.

DC

Power

Supply:

Never

pull,

bend

or

extend

the

power

cord.

This

could

damage

the

power

cord,

resulting

in

a

broken

cord

or

short-

circuit.

rn

,

(MPBEN

Always

grasp

the

plug.

Installation

notes

Do

not

place

this

unit

in

a

location

that

is

exposed

to

direct

sunlight,

near

a

heating

appliance,

etc.

oo

~

Do

not

store

or

use

the

unit

in

a

dusty

location

or

in

a

moist

atmosphere.

Select

a

location

where

there

is

good

ventila-

‘

-s

In

case

of

an

abnormal

odor

If

an

abnormal

odor

or

smoke

is

detected,

immediately

turn

the

power

OFF

and

pull

out

the

power

cord.

Contact

your

dealer

or

nearest

Service

Station.

Ox

(ges

To

maintain

good

ventilation,

do

not

put

books

or

papers

on

the

unit.

Position

the

unit

at

least

10

cm

away

from

the

walls.

,

Cleaning

Do

not

use

volatile

solvents

such

as

alcohol,

paint

thinner,

gasoline,

benzine,

etc.

to

clean

the

cabinet.

Use

a

silicone

cloth

or

a

clean

dry

cloth.

Silicone

cloth

Thinner

Benzine

2.

SPECIFICATIONS

AND

ACCESSORIES

2-1.

SPECIFICATIONS

Model

TM-721A4

TM-721E

.

Other

markets

Specifications

U.S.A.

version

144

to

148

MHz

|144

to

148

MHz]

144

to

146

MHz

Frequency

range

438

to

450

MHz

|430

to

440

MHz

|

430

to

440

MHz

Mode

F3E

(FM}

Antenna

impedance

50

ohms

3

Power

requirements

13.8

VOC

+15%

S

Ground

Negative

&

|

[Transmit

mode

(Max.}

O5A

5-5/

Receive

made

with

no

58

Sena

0.6

A

Operating

temperature

20°C

to

+60°C

(-4°F

to

+140°F)

Dimensions

(W

x

H

x

0}

"yO"

™

(Projections

included)

180x

50x

219

mm

(5.9%x

27x

8.6%}

Weight

1.8

kg

(3.97

Ibs)

Output

|

HI

144

MHz:

45

W,

430/440

MHz:

35

W

power

=

[

LOW

5

Ww

FY

Modulation

Reactance

modulation

€

|

Spurious

radiation

Less

than

—60

dB

¢

Maximum

frequency

deviation

+5

kHz

&

|

Audio

distortion

{at

60%

modulation)

Less

than

3%

{300

to

3000

Hz)

Microphone

impedance

§00

to

600

ohms

Circuitry

Double

conversion

superheterodyne

:

144

MHz:

16.9

MH2z/455

kHz,

intermediate

|

O=*

version

440

MHz:

21.6

MHz/455

kHz

frequency

144

MHz:

10.7

MH2/455

kHz,

-,

Other

market

430

MHz:

30.825MH2/455

kHz

2

Sensitivity(12

dB

SINAD)

MMizeLess

than

0.2

nV

.450/440iiizsLess_

then

0.16

7

oe

a

yt

—6

dB:

More

than

12

kHz,

&

|

Selectivity

~60

dB;

Less than

24

kHz

Spurious

response

Better

than

60

dB

Squelch

sensitivity

Less

than

0.09

gV

Output

More

than

2 W

across

8

ohms

load

(5%

distortion)

External

speaker

impedance

8

ohms

Notes:

1.

Circuit

and

ratings

are

subject

to

change

without

notice

due

to

advancement

in

technology.

2.

*

:

Recommended

duty

cycle:

1

minute

:

Transmission,

3

minutes

:

Reception

2-2.

ACCESSORIES

Unpack

your

new

transceiver

carefully,

and

confirm

that

the

accessories

listed

below

are

included

in

the

box.

MC-48B

DTMF

Microphone

(U.S.A,

only)

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

peceeeeeeee

T91-0359-05....1

ea.

or

Dynamic

Microphone

......

seeeeeeeee

1

91-0365-15....1

ea.

Microphone

Hook

(U.S.A.

only)...J20-0319-24

....1

ea.

Self

tapping

Screw

(U.S.A.

only)

.N46-3010-46....2

ea.

Mobile

Mounting

Kit

;

Bracket

........cscsceceveer

even

ree

»-»

JZ9-0418-03

....1

ea.

SEMS

Screw

.......

venta

eeeeeecene

..NO9-1530-05....4

ea.

Self

tapping

Screw

........-...06

NO9-0335-05....4

ea.

Flat

Washer..........++

be

ereeeeere

ba

eseeeeeeeee

4

ea.

DC

Power

Cable..............

seeereee-EGO-2111-05

....1

ea.

Fuse

(10A).......-c0esreeeeeeee

beeeerees

FO5-1031-05

....1

ea.

Instruction

Manual..............6.

....B50-8225-00...1

copy

Warranty

Card

(U.S.A.

only)...

veseel

C8,

After

unpacking

Shipping

container:

Save

the

boxes

and

packing

in

the

event

your

unit

needs

to

be

transported

for

remote

operation,

maintenance,

or

ser-

vice.

3.

INSTALLATION

INSTRUCTIONS

3-1.

INSTALLATION

Mounting

Bracket

When

installing

the

transceiver

in

a

vehicle

consider

the

ease

of

operation

and

safety

when

selecting

the

location

for

the

mounting

bracket.

1.

Install

the

bracket

using

the

supplied

flat

washers

and

self

tapping

screws

(4

5

washer

—

pcs.

each).

.

ne

capping

—4

2.

Attach

the

transceiver

loosely

using

the

SEMS

screws

(4

pcs.).

3.

The

angle

of

the

bracket

may

be

adjusted

to

any

of

9

possible

viewing

angles.

Select

the

desired

angle.

Fig.

1

(Fig.

2)

4.

Hold

the

transceiver

in

place

and

tighten

the

4

SEMS

screws

using

a

wrench

or.screwdriver.

To

144

MHz

To

430

MHz

3-2.

CONNECTIONS

3-2-1.

Mobile

Installations

The

MA-40C0

dual

band

.

To

144

MHz

antenna

is

recommended.

4

External

Speaker(_]

The

SP-40

or

»

the

SP-5OB

is

Oe

i

recommended.

Duplexer

|

To

430/440

MHz

antenna

Cautions:

1.

Before

installing

the

power

cable,

be

sure

to

remove

the

negative

lead

from

the

battery

for

safety.

2.

After

installation

and

wiring,

be

sure

to

double

check

for

correct

installation

before

reconnecting

the

negative

lead

to

the

battery

terminal.

3.

If

the

fuse

opens,

be

sure

to

check

that

each

conductor

has

not

been

damaged

by

short-circuiting,

etc.

Then

replace

with

a

new

fuse

of

the

same

rating.

4.

After

completing

the

wiring,

wrap

the

fuse

holder

with

heat

resistant

tape

to

protect

against

heat

and

moisture.

5.

Do

not

remove

the

fuse

even

if

the

power

cable

is

too

long.

A.

Battery

Connections

Connect

the

power

cable

directly

to

the

battery

terminals.

Use

of

the

cigarette

lighter

socket

can

lead

to

poor

connec-

tion,

and

result

in

poor

performance.

Pay

close

attention

to

the

polarity

of

the

cables

when

connecting

them

to

the

bat-

tery.

Make

sure

the

positive

(+)

and

negative

(—)

lead

polarity

is

correct

when

connecting

to

the

battery.

Engine

cornpartment

~—{—+~

Passenger

compartment

Red

Fuse

(

To

the

transceiver

Select

a

location

where

the

power

cable

is

pro-

tected

from

heat,

mois-

ture

or

abrasion

wi

securing

the

cable.

4

Chassis

or

fire

wall

by

using

a

grommet.

@

If

the

wiring

hole

in

the

fire

wall

or

chassis

is

too

small,

disassemble

the

fuse

holder

to

thread

the

wire

through

the

hoie.

From

passenger

compartment

Thread

like

this

B.

Ignition

Noise

This

transceiver

has

been

designed.

to

suppress

ignition

noise;

however,

if

excessive

noise

is

present,

it

may

be

necessary

to

use

suppressor

spark

plugs

(with

resistors).

3-2-2.

Fixed

Station

A

regulated

DC

power

supply

(13.8

VDC

capable

of

sup-

plying

at

least

10

Amperes)

is

required.

The

PS-430

and

the

PS-50

are

recommended.

CAUTION:

1.

Never

connect

the

AC

power

cable

to

the

AC

outlet

until

all

other

connections

have

been

made.

2.

Before

connecting

and

disconnecting

the

power

connec-

tor,

be

sure

to

turn

off

the

POWER

switches

of

both

the

transceiver

and

the

DC

power

supply.

3.

Observe

polarity

of

the

DC

power

cable.

The

transceiver

operates

on

13.8

VDC,

negative

ground.

Battery

polari-

ty

must

be

correct.

The

power

cable

is

color

coded:

Red

—

+

(Positive

polarity)

Black

~

~—

(Negative

polarity)

£

To

144

MHz

antenna

PS-430

SP-430

To

430/440

MHz

antenna

3-2-3.

Antenna

The

type

of

antenna

that

is

used

will

greatly

affect

the

per-

formance

of

the

transceiver.

Use

a

properly

adjusted

anten-

na,

of

good

quality,

to

enable

your

transceiver

to

perform

at

its

best.

The

antenna

input

impedance

is

50

ohms.

Use

50-ohm

coaxial

cable

such

as

RG-8U

or

8D-2V

for

this

connection.

If

the

antenna

is

far

from

the

transceiver

the

use

of

low

loss

coaxial

cable,

such

as

RG-8U

is

recom-

mended.

Match

the

impedance

of

the

coaxial

cable

and

that

of

the

antenna

so

that

the

SWR

is

less

than

1.5

to

1.

The

protection

circuit

in

the

transceiver

will

activate

if

the

SWR

is

particularly

poor

(greater

than

3

to

1).

High

SWR

values

will

cause

the

transmitter

output

to

drop,

and

may

lead

to

TVI

or

BCI

reports.

Caution:

For

protection

against

fire,

electric

shock,

personal

injury,

or

damage

to

the

radio,

use

a

lightning

arrester

in

your

antenna

lines.

4.

OPERATION

4-1.

OPERATING

CONTROLS

4-1-1.

Front

Panel

©

@

10

D

@

ert

REV

ERI

cy

|

Meats

BANDE

TM-7PtA]

vO

“Ge

'2n"

cTcbs

BAS

Se

&

iran

=

FF

DO

@=——op

=

Chae

a

lc

BUSY

LOW

AL

Ree

oe

ot

BALL

ce

Sh

OA

78

O;

poo

eo

Cc

AB

MUTE

Main

Tuning

control

This

control

is

used

to

select

the

desired

transmit/

receive

frequency,

Memory

Channel,

Frequency

Step,

Tone

Frequency,

and

Scan

direction

of

the

MAIN

fre-

quency

band.

CALL

key

(TM-721A)

The

CALL

key

selects

the

CALL

channel

of

the

MAIN

frequency

band.

The

frequency

has

been

factory-set

as

follows,

but

may

be

reset

to

any

desired

frequency.

(See

CALL

Channel

P25.)

U.S.A.

version

;

440.000/144.000

Other

market

;

430.000/144.000

TONE

key

(TM-721E)

European

version:

This

key

is

used

to

transmit

a

Tone

signal.

When

the

key

is

depressed

the

repeater

con-

trol

signal

of

1750

Hz

is

activated.

U.K.

version:

This

key

is

used

to

activate

the

1750

Hz

tone

burst.

VFO

key

This

key

is

used

to

return

to

VFO

operation

after

|

@

BY

operating

in

the

MR

(Memory

Recall),

or

CALL

Channel

mode

(TM-721A

only).

The

MAIN

tuning

control

will

increase

frequency

in

the

selected

step

size,

the

tone

frequency

(TM-721A

only),

and/or

the

frequency

step.

MR/M

key

This

key

is

used

to

select

Memory

Recall

operation

after

operating

in

the

VFO

or

CALL

channel

mode.

The

MAIN

Tuning

control

may

be

used

to

select

the

desired

memory

channel

in

this

mode.

VOL

control/Power

switch

;

The

volume

control

and

power

switch

are

combined.

Rotating

the

control

clockwise

will

turn

ON

the

transceiver.

Advancing

the

control

further

clockwise

will

increase

the

total

volume

of

two

bands.

The

BALANCE

control

proportions

the

volume

among

the

two

bands.

MAIN

SQL

control

This

control

is

used

to

select

the

desired

SOL

threshold

level

of

the

MAIN

frequency

band.

Kenwood TM-721A User manual

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