Kenwood Tm-621a User manual

GOO/ANA

144/220MHz

FM

DUAL

BANDER

M-621A

144/440MHz

FM

DUAL

BANDER

IM-721A

144/430MHz

FM

DUAL

BANDER

IM-721A

TM-721E

INSTRUCTION

MANUAL

KENWOOD

CORPORATION

@©PRINTED

IN

JAPAN

B50-8225-10(K,

M,

T.W)(T)

89/121110987654321

881211098

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

place

the

transceiver

where

the

heat

sink

(rear

panel)

might

come

in

contact

with

plastic

or

vinyl

surfaces.

This

Instruction

Manual

covers

the

following

models.

TM-621A

:

144/220

MHz

FM

DUAL

BANDER

TM-721A

:

144/440

MHz

FM

DUAL

BANDER

(U.S.A.

version)

TM-721A

:

144/430

MHz

FM

DUAL

BANDER

(Other

market)

TM-721E

:

144/430

MHz

FM

DUAL

BANDER

(with

Tone

Burst

for

U.K.

version)

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

per-

sonal

injury.

Illustrations

show

the

TM-721A.

CONTENTS

Pioh>

BEFORE

OPERATION

4

SPECIFICATIONS

and

ACCESSORIES

.

a6

INSTALLATION

INSTRUCTIONS

...

as

OPERATION

ie

vin

csnntgs

nnn

esispicensnspiivsadveredeavenses

10

OPERATING

CONTROLS

RECEIVER

OPERATION.

s.vesencoscossneivses

esses

een

15

Reception

Frequency

Selection

Frequency

Step

Selection

ie

A.B.C.

(Automatic

Band

Change)

.............0+

18

Beep

Tone

TRANSMITTER

OPERATION

REPEATER

OPERATION

...0.ce3tvasivauasitecseaseeas

Transmitter

Offsets

Reverse

Function

Tone

Operation

Autopatch

(U.S.A.

version

only)

MEMORY

7.05

s25e

sins

shswcasennasacsdcteuansecuvee

este

Microprocessor

Memory

Back-up

Microprocessor

Initialization

Memory

Channel

Memory

Contents

Memory

Enithyiscistesesescectssssevecssnexsas

ceases

23)

Simplex/Normal

SHIFT

Odd

Split

Channel

Call.

CHANG)

aides

nnsnexrcinesnasnsinediiencwexe

25

Memory

Recall

Memory

Shift

Scan

Options

Programmable

Band

Scan/Band

Scan

Memory

Channel

Scan

Hold

Resume

Programming

Priority

Alert,

ccscssousesveceurascsarsacetiaewsserews

27

Memory

Channel

Lockout

BLOCK

DIAGRAM

and

SCHEMATIC

DIAGRAM

°7"""""

another

sheet

MAINTENANCE.....

in

Case

of

Difficulty

....

OPTIONAL

ACCESSORIES....

CTCSS

unit

TSU-6

(U.S.A.

version)

...

REMOTE

CONTROLLER

RC-10....

REFERENCE

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-

BBUny

of

2

tally,

a

serious

electric

shock

might

occur.

DC

Power

Supply:

Touching

the

power

plug

when

your

hands

are

wet

may

result

in

a

serious

electric

shock.

Never

touch

internal

parts.

F

vie

F

~Qury

If

a

metal

object,

such

as

a

hair

or

a

needle,

comes

into

4

\

contact

with

the

power

socket

on

the

rear

panel,

a

o*

%\___

Never

touch

with

wet

hands.

dangerous

electric

shock

may

result.

Never

permit

children

jp

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.

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.

Oe

.

pV

Do

not

store

or

use

the

unit

in

a

dusty

location

or

in

a

moist

atmosphere.

Select

a

location

where

there

is

good

ventila-

tion.

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.

(3

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

TM-721A

‘eure

Other

markets

TM-721E

TM-621A

version

Frequency

range

144

to

148

MHz|144

to

148

MHz|144

to

146

MHz|144

to

148

MHz.

438

to

450

MHz/|430

to

440

MHz|430

to

440

MHz/220

to

225

MH:

Mode

F3E

(FM)

Antenna

impedance

50

ohms

Power

requirements

13.8

VDC

+15%

Ground

Negative

_

Less

than

9.5

A

5G]

Receive

mode

with

no

135]

signal

rf

Transmit

mode

Less

than

0.6

A

Operating

temperature

—

20°C

to

+60°C

(—4°F

to

+140°F)

Dimensions

(W

x

H

x

D)

(Projections

included)

150

x

50

x

219

mm

(5.9

x2"

x

8.6")

Weight

1.8

kg

(3.97

Ibs)

Output

power*

144

MHz:

45

W,

220

MHz:

25

W,

430/440

MHz:

35

W

5W

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

500

to

600

ohms

Circuitry

Double

conversion

superheterodyne

U.S.A,

version

Intermediate

144

MHz:

16.9

MHz/455

kHz,

220

MHz:

30.825

MHz/455

kHz,

440

MHz:

21.6

MHz/455

kHz

frequency

Other

market

144

MHz:

10.7

MHz/455

kHz,

430

MHz:

30.825MHz/455

kHz

2)|

Sensitivity(12

dB

SINAD)

144

MHz:

Less than

0.2

uV,

220

MHz:

Less

than

0.18

2V,

430/440

MHz:

Less

than

0.16

wV

Selectivity

—6

dB:

More

than

12

kHz,

—

60

dB:

Less

than

24

kHz

Spurious

response

Better

than

60 dB

Squelch

sensitivity

Less

than

0.09

«V

Output

More

than

2

W

across

8

ohms

load

(5%

distortion)

External

Notes:

8

ohms

1.

Circuit

and

ratings

are

subject

to

change

without

notice

due

to

ad-

vancement

in

technology.

2.

*:

Recommended

duty

cycle:

1

minute

:

Transmission,

3

minutes

:

Reception

2-2.

ACCESSORIES

Unpack

your

new

transceiver

carefully,

and

con-

firm

that

the

accessories

listed

below

are

included

in

the

box.

MC-48B

DTMF

Microphone

(U.S.A.

only)

.........0086

791-0359-15.....

1

ea.

or

Dynamic

Microphone......

T91-0365-15.....

1

ea.

Microphone

Hook

(U.S.A.

(only):

......2.00008

J20-0319-24......

1

ea.

Self

tapping

Screw

(U.S.A.

only)

..

-N46-3010-46

.

Mobile

Mounting

Kit

Bracket

SEMS

Screw

..

Self

tapping

Screw.

-N99-0318-05.....1

ea.

-J29-0418-03......

1

ea.

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

ea.

-NO9-0335-05

.....4

ea.

Flat

Washer.sc..,csossensnsaenivsovpaccaresysaonees

DC

Power

Cable

-E30-2111-05

.

Fuse

(10A)

-FO5-1031-05.....

Instruction

Manual

.........

B50-8225-XX

..1

copy

Warranty)

Cards:

caamccsssssevecscgarsececcssnetone

1

ea.

After

unpacking

Shipping

container:

Save

the

boxes

and

packing

in

the

event

your

unit

needs

to

be

transported

for

remote

operation,

main-

tenance,

or

service.

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

Flat

and

self

tapping

screws

(4

__

washer

—~

Self

tapping

—-

pcs.

each).

seid

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.

3-2.

CONNECTIONS

3-2-1.

Mobile

Installations

TM-721A/721E:

The

MA-4000

dual

band

antenna

is

recommended.

To

144

MHz

antenna

The

SP-40

or

=

the

SP-50B

is

_

recommended.

_

¥

External

a)

Duplexer

\

-

Pp

+

TM-621A:

TM-721A/721E:

To

144

MHz

To

430

MHz

To

220

MHz

To

430/440

MHz

antenna

=

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.

Red

Engine

compartment

-—}|—-~

Passenger

compartment

Fuse

To

the

transceiver

Select

a

location

where

E

power

cable

is

pro-

brargpondet

bran

pmo

does

not

directly

con

tact

the

edge

of

the

hole

¢

by

using

a

grommet.

Chassis

or

fire

wall

tected

from

heat,

mois-

ture

or

abrasion

when

securing

Battery

the

cable.

@

lf

the

wiring

hole

in

the

fire

wall

or

chassis

is

too

small,

disassemble

the

fuse

holder

to

thread

the

wire

through

the

hole.

From

passenger

compartment

oy

——————

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:

.

Never

connect

the

AC

power

cable

to

the

AC

outlet

until

1

2.

all

other

connections

have

been

made.

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.

.

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)

f

+

To

144

MHz

antenna

+

[

?

TM-621A

or

SP-430

6

—

TM-621A

:

To

220

MHz

antenna

TM-721A/721E

:

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

®

®@

3@

a

46

a

6

+

+)

||

mom

scan

=

7

goliney

|

ereas

ea

ky

06.

eo

es

Aoaeaae

seeoaga|

!

Le

He

t

gE

ee

®

wo

i

@

(09

(@)

Main

Tuning

control

®

VFO

key

This

control

is

used

to

select

the

desired

transmit/

This

key

is

used

to

return

to

VFO

operation

after

oper-

receive

frequency,

Memory

Channel,

Frequency

Step,

ating

in

the

MR

(Memory

Recall),

or

CALL

Channel

mode

Tone

Frequency,

and

Scan

direction

of

the

MAIN

fre-

(TM-621A/721A

only).

quency

band.

The

MAIN

tuning

control

will

increase

frequency

in

the

@

CALL

key

(TM-621A/721A)

selected

step

size,

the

tone

frequency

(TM-621A/721A

The

CALL

key

selects

the

CALL

channel

of

the

MAIN

only),

and/or

the

frequency

step.

frequency

band.

The

frequency

has

been

factory-set

as

@

MR/M

key

follows,

but

may

be

reset

to

any

desired

frequency.

(See

This

key

is

used

to

select

Memory

Recall

operation

af-

CALL

Channel

P25.)

ter

operating

in

the

VFO

or

CALL

channel

mode.

The

TM-621A

;

220.000/144.000

MAIN

Tuning

control

may

be

used

to

select

the

desired

TM-721A

memory

channel

in

this

mode.

U.S.A.

version

;

440.000/144.000

®

VOL

control/Power

switch

Other

market

+

430.000/144.000

The

volume

control

and

power

switch

are

combined.

TONE

key

(TM-721E)

Rotating

the

control

clockwise

will

turn

ON

the

tran-

European

version:

This

key

is

used

to

transmit

a

Tone

sceiver.

signal.

When

the

key

is

depressed

the

repeater

con-

Advancing

the

control

further

clockwise

will

increase

trol

signal

of

1750

Hz

is

activated.

the

total

volume

of

two

bands.

The

BALANCE

control

U.K.

version:

This

key

is

used

to

activate

the

proportions

the

volume

among

the

two

bands.

1750

Hz

tone

burst.

©

MAIN

SOL

control

This

control

is

used

to

select

the

desired

SOL

threshold

level

of

the

MAIN

frequency

band.

10

Kenwood TM-621A User manual

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