Kenwood Tm-621a User manual

COO/ANAD

144/220MHz

FM

DUAL

BANDER

TM-621A

144/440MHz

FM

DUAL

BANDER

IM-721A

144/430MHz

FM

DUAL

BANDER

IM-721A

TM-721E

INSTRUCTION

MANUAL

KENWOOD

CORPORATION

©PRINTED

IN

JAPAN

BS0-8225-10(K,

M,

T.W)(T)

89/12

1110987654321

88/12111098

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

:

144/43Q

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

Pes

BEFORE

OPERATION

...............202000csssceceeeees

4

SPECIFICATIONS

and

ACCESSORIES

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

6

INSTALLATION

INSTRUCTIONS

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

7

OPERATION

joss

csicccccecocveccsocnvetsvecseecsevsesseess

10

OPERATING

CONTROLS

RECEIVER

OPERATION.

.......sccccecceccessecscccees

15

Reception

Frequency

Selection

.......ccssessececeeeceeseneees

16

Frequency

Step

Selection........scesesescereseees

17

A.B.C.

(Automatic

Band

Change)

...........000.

18

Beep

Tone

TRANSMITTER

OPERATION

.......sccceessssceeenes

19

REPEATER

OPERATION..........

snedeveelectenessnie

19

Transmitter

Offsets

Reverse

Function

Tone

Operation

Autopatch

(U.S.A.

version

only)......sss+seeeees

21

MEMORY

isaac

ccncsseccossnstceacciacnccssdesscsdsreceses

22

Microprocessor

Memory

Back-up

Microprocessor

Initialization

Memory

Channel

Memory

Contents

Memory

Entry

.....cscccsccsccccecccssssrscecesssas

23

Simplex/Normal

SHIFT

Odd

Split

Channel

Call

Channnel......cccccssscssscessccesccessesens

25

Memory

Recall

Memory

Shift

Scan

Options

Programmable

Band

Scan/Band

Scan

Memory

Channel

Scan

Hold

Resume

Programming

Priority

Alert

.....ccccesceccscceccssesenccsvecensuaes

27

Memory

Channel

Lockout

BLOCK

DIAGRAM

and

SCHEMATIC

DIAGRAM

"°°"

another

sheet

MAINTENANCE

............ccccccscesscccrsescncnsscnens

28

In

Case

of

Difficulty

.......ccccsccssscescsscacessaceers

29

OPTIONAL

ACCESSORIES.

............scecscsesenees

31

CTCSS

unit

TSU-6

(U.S.A.

version)

.....:.cssseees

33

REMOTE

CONTROLLER

RC-10.........sseeeecsseees

34

REFERENCE

..........00ceeccscccsecestsasecenrsscceeeees

37

1.

BEFORE

OPERATION

Safety

precautions

Never

remove

the

case

unless

instructed

to

do

so

in

this

In-

struction

Manual.

If

the

internal

parts

are

touched

acciden-

tally,

a

serious

electric

shock

might

occur.

Never

touch

internal

parts.

If

a

metal

object,

such

as

a

hair

or

a

needle,

comes

into

contact

with

the

power

socket

on

the

rear

panel,

a

dangerous

electric

shock

may

result.

Never

permit

children

to

put

anything,

especially

metal

objects,

inside

this

unit.

The

power

requirement

is

13.8

VDC.

Never

attempt

connection

to

a

24

VDC

source.

DC

Power

Supply:

Touching

the

power

plug

when

your

hands

are

wet

may

result

in

a

serious

electric

shock.

6°

*\

Never

touch

with

wet

hands.

[DQ

aN

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.

O=

cao

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.

oye

(gen

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

Specifications

wa]

T™721E

|

TMs21A

Other

markets

:

U.S.A.

version

|

Other

mark

Frequency

range

144

to

148

MHz|144

to

148

MHz|

144

to

148

MHz|144

to

148

MHz|

1438

to

460

MHz|430

to

440

MHz|430

to

440

MHz|220

to

225

MHa

FSE

(FM)

20°C

te

F

to

+

140°F)

150x

60x

219

mm

(6.9"

x2"

x8.6")

ria

1.8

kg

(3.97

ibs)

144

Miz:

45

W,

220

MHz:

25

W,

Sw

Reactance

modulation

Less

than

-

60

dB

£5

kHz

frequency

Audio

distortion

(at

60%

modulation)

Less

than

3%

(300

to

3000

He)

‘Microphone

impedance

Circuitry

U.S.A.

version

Intermediate

144

MHz:

16.9

MHz/465

kHz,

220

MHz:

30.825

MHz/458

kHz,

440

MHz:

21.6

MHz/455

kHz

frequency

Other

market

144

MHz

430

MHz:

Ser

;ty(12

4B

SINAD)

144

Wiz:

Loge

than

0.2

‘MHz:

Less

than

0.18

aV,

30/440

NAH:

v.

220

Lass than

0.16

Solectivity

@

ohms

foad

(5%

distortioni

Notes:

8

ohms

1.

Circuit

and

ratings

are

subject

to

change

without

notice

due

to

ad-

vancement

in

technology.

2.

*:

Recommended

1

minute

duty

cycle:

:

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)...

.-T91-0359-15

.....

1

ea.

or

Dynamic

Microphone......

791-0365-15

.....1

ea,

Microphone

Hook

(U.S.A,

only)...

eee

-.J20-0319-24,.....1

ea.

Self

tapping

Screw

(U.S.A.

only)

.

-N46-3010-46.....2

ea.

Mobile

Mounting

Kit

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

Bracket......

seatereeseesesS29-0418-03,

SEMS

Screw

.

-NO9-1530-05

Self

tapping

Screw.

.....NO9-0335-05

Flat

Washer...

DC

Power

Cable

.

-E30-2111-05

Fuse

(10A)....

-FO5-1031-05..

Instruction

Manual

.

-B50-8225-XX

Warranty

Card

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

5.

and

self

tapping

screws

(4

__

washer

——~

Self

tapping

—

4

pcs.

each).

.

ccroin

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

¥

External

Speaker

¥

Tre

SP-40

or

the

SP-50B

is

bln

Oy

Duplexer

To

220

MHz

To

430/440

MHz

TM-621A:

4

TM-721A/721E:

antenna

To

144

MHz

To

430

MHz

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.

|

i

I

i.

:

i

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

compartment

«—-1—-

Passenger

compartment

Red

Fuse

To

the

transceiver

Chassis

or

fire

wall

@

if

the

wiring

hole

in

the

fire

wall

or

chassis

is

too

small,

disassemble

the

fuse

holder

to

thread

the

wire

through

the

hole.

Set

=

a

Thread

like

this

compartment

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.

2.

Never

connect

the

AC

power

cable

to

the

AC

outlet

until

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

v

PS-430

Fee

Leases

or

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

Jess

than

1.5

'to

4.

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:

ABABA

For

protection

against

fire,

electric

shock,

personal

injury,

or

damage

to

the

radio,

use

a

lightning

arrester

in

your

antenna

lines.

i

4.

OPERATION

4-1.

OPERATING

CONTROLS

4-1-1.

Front

Panel

‘O)

@

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-621A/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.)

TM-621A

;

220.000/144.000

T™M-721A

U.S.A.

version

;

440.000/144.000

Other

market

3;

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.

®

Sa

axe

yy?

M$

oN

°

La

VFO

key

This

key

is

used

to

return

to

VFO

operation

after

oper-

ating

in

the

MR

(Memory

Recall),

or

CALL

Channel

mode

(TM-621A/721A

only).

The

MAIN

tuning

control

will

increase

frequency

in

the

selected

step

size,

the

tone

frequency

(TM-621A/721A

only),

and/or

the

frequency

step.

MR/M

key

This

key

is

used

to

select

Memory

Recall

operation

af-

ter

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

tran-

sceiver.

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.

@_

Microphone

connector

Plug

the

standard

or

optional

microphone

into this

jack.

GND

(PTT)

-—-(@)GND

(Microphone)

@RX

Audio

output

{Approx.

150

mV/600

0)

~~——(@)8

V/Max.

50

mA

@

Microphone

audio

@up

Front

view

MHz

key

This

key

is

used

to

change

frequency

in

1

MHz

steps

during

VFO

operations.

Pressing

and

holding

the

key

will

continuously

change

the

frequency

in

1

MHz

steps.

(@)

Sub

Tuning

control

This

control

is

used

to

select

the

desired

receive

fre-

quency

and

Memory

channel

of

the

SUB

band.

@Q

LOCK

switch

This

key

will

deactivate

all

functions

except

the

PTT

switch.

@)

BALANCE

control

This

control

proportions

the

total

audio

volume

among

the

two

bands.

MAIN

position

:

Audio

only

from

the

MAIN

band

Center

position

:

Equal

audio

from

both

bands

SUB

position

:

Audio

only

from

the

SUB

band

2

SUB

SQL

control

This

control

is

used

to

select

the

desired

SQL

threshold

level

of

the

SUB

band.

(3

LOW

key

This

key

is

used

to

select

the

transmit

output

power

level

as

follows:

HI

(no

indicator):

144

MHz:45

W/220

MHz:25

W/

430

MHz:35

W

LOW

:

SW

(4

DIM

key

This

key

is

used

to

select

either

high

or

low

intensity

of

both

the

LCD

display

and

control's

illuminations.

For

the

key

to

function,

it

must

be

pressed

within

5

seconds

after

pressing

the

F

key.

@)

A.B.C.

(Automatic

Band

Change)

When

this

key

is

pressed,

the

contents

of

the

SUB

band

will

be

transfered

to

the

MAIN

band

whenever

a

signal

is

received

at

the

SUB

band

antenna,

which

is

strong

enough

to

open

the

squelch.

The

contents

of

the

MAIN

band

are

transfered

to

the

SUB

band

at

the

same

time.

(8

DUAL

band

This

key

is

used

to

turn

the

SUB

band

ON

or

OFF.

()

BAND

key

This

key

is

used

to

change

the

contents

of

the

MAIN

band.

T™M-

~o

®

@®

SCAN

Key

This

key

is

used

to

start

or

stop

scanning.

®

The

F key

is

activate

these

keys

below

for

5

seconds

after

pressing

the

key,

@

T.

SEL

key

(TM-621A/|

|

(Q

STEP

key

@

L.

OUT

key

This

key

is

used

to

tem-

porarily

skip

unwanted

Memory

Channels

during

the

Memory

Channel

Scan

mode.

This

key

is

used

to

select

the

desired

transmitter

of-

fest

during

repeater

operations.

When

the

key

is

pressed

the

shift

mode

cycles

from

+

to

—

[—

to

—

(European

version)]

to

simplex

(no

indicator).

AL

key

This

key

is

used

to

check

Memory

Channel

1

at

ap-

prox.

5

second

intervals.

If

the

channel

is

busy,

a

beep

will

sound.

TM-721E£

need

not

press-

ing

the

F

key

to

activate

the

AL

key.

_

Sa

af

A

4

_

TONE

key

(TM-621A/

721A)

This

key

is

used

to.

ac-

tivate

the

subaudible

tone

encoder.

721A)

This

key

is

used

to

switch

to

the

tone

frequency

selection

mode.

The

MAIN

Tuning

control

can

then

be

used

to

select

the

desired

tone

frequen-

cy.

th

and

during

the

‘‘F'’

indicator

is

ON.

™-

we

(@)

REV

key

This

key

is

used

to

reverse

the

transmit/receive

fre-

quencies

during

repeater

operations.

This

wilt

allow

you

to

check

the

input

of

the

repeater

or

to

operate

on

a

reverse

repeater

pair.

This

key

is

used

to

switch

to

the

frequency

selection

mode

during

VFO

opera-

tion.

The

MAIN

Tuning

control

can

then

be

used

to

select

the

desired

fre-

quency

step.

a

iol

SHIFT

AL

mopeao

7

MUTE

key

This

key

is

used

to

reduce

the

volume

of

the

SUB

band

(Approximatety

20

dB).

()

CTCSS

key

(TM-621A/

721A)

With

the

TSU-6:

This

key

is

used

to

activate

the

CTCSS

function.

Pressing

the

BAND

key

to

transfer

the

contents

of

the

SUB

band

to

the

MAIN

band

will

release

the

CTCSS

function.

Tone

will

be

ON

dur-

ing

transmitting.

Without

the

TSU-6:

The

CTCSS

function

does

not

actuate

even

if

the

indicator

is

ON.

LCD

display

The

MAIN

band

indicators

The

SUB

band

E

SCAN

_—

T

oor

ao

0

2100

C180

agg

5

7

sieeitnaregnoyesltA@t

|

siemepeeeneit

(BUSY

Low

al

|

AE

BC

|

MUTE

The

MAIN

band

Indicators

Displays

the

operating

frequency

to

the

nearest

kHz,

the

frequency

step,

( 1

a

g

a

of

a

_

and/or

the

tone

frequency

(TM-621A/

=

721A).

This

level

meter

indicates

the

relative

receive

input

signal

strength

or

transmitter

RF

output.

ON

whenever

the

squelch

is

open.

ON

during

transmit.

®

ON

when

the

CALL

channel

is

ON.

(TM-621A/721A)

@

SCAN

ON

when

Scanning.

@®-=-

+

Displays

the

selected

transmitter

off-

‘aa!

emt

set

direction.

(TM-721E

European

version}

@®

T

ON

when

the

Tone

function

is

ac-

tive.

®

REV

ON

when

the

Reverse

function

is

ac-

tive.

®

LOW

Indicates

low

power

has

been

selected.

;

@

AL

ON

when

the

Priority

Alert

system

is

active.

ON

whenever

the

F

key

is

depressed.

Fr

(Always

displays

the

last

Memory

a]

Channel

number

that

had

been

selected.)

=

Displays

the

current

Memory

Chan-

*

ut

nel

number.

a]

The

*

indicator

is

ON

when

the

Memory

channel

will

be

skipped

dur-

ing

Memory

Channel

Scan.

°

ABC

ON

when

the

A.B.C.

(Automatic

Band

Change)

function

is

ON.

The

SUB

band

indicators

Tip

Displays

the

receive

frequency.

S88888a

ad

mu

<—_————'ndicates

relative

signal

strenght

dur-

k

ing

reception.

ON

whenever

the

squelch

is

ON.

@

cTcss

(TM-621A/721A)

ON

when

the

CTCSS

function

is

ac-

tive.

ON

when

the

volume

of

the

SUB

band

is

reduced.

@

MUTE

13

4-1-2.

Rear

Panel

O—n-¥

‘@

ANT

(Antenna)

connector

Attach

an

antenna

with

an

impedance

of

50

ohms

to

this

connector

(PL-259).

A

for

144

MHz

B

for

220

MHz

(TM-621A)

430

MHz,

440

MHz

(TM-721A/721E)

@)

13.8

VDC

power

input

connector

Connect

the

supplied

OC

Power

Cable

to

this

connec-

tor.

Pay

close

attention

to

the

polarity

(the

DC

Power

Cable

is

color-coded;

red

is

positive

and

black

is

nega-

tive),

when

connecting

the

cable

to

the

power

source.

@

Fuse

holder

Contains

a

fuse

(10A)

SP

(Speaker)

jack

This

jack

is

for

connection

of

an

8-ohm

external

speaker.

4-1-3.

Microphone

U.S.A.

version

only

@

and

@)

UP/DWN

(Up/Down)

switches

These

switches

are

used

to

step

the

VFO

frequency

or

Memory

Channel

up

and

down.

The

frequency

will

change

continuously

if

the

switches

are

pressed

and

held.

PTT

(Push

To

Talk)

switch

The

transceiver

will

be

placed

into

transmit

whenever

this

switch

is

pressed.

Operations

such

as

scanning

will

be

cleared

when

this

switch

is

pressed.

16-Tone

DTMF

Keypad

(U.S.A.

version

only)

Used

to

activate

the

DTMF

encoder.

See

Section

4-4

REPEATER

for

additional

information

on

this

item.

4-2.

RECEIVER

OPERATION

The

transceiver

will

supply

audio

confirmation

whenever

a

function

is

activated.

(See

BEEP

TONE

page

18.)

4-2-1.

Reception

1.

Connect

the

power

supply

and

antennas,

and

then

set

the

switches

and

controls

as

follows:

POWER

(VOL)

control:

OFF

(Fully

counterclockwise)

POWER

switch

of

the

DC

power

supply

(Fixed

Station)

:

OFF

MAIN

SQL

control

:

Fully

counterclockwise

SUB SQL

control

:

Full

left

BALANCE

contro!

__:

Full

left

(MAIN)

LOCK

switch

:

OFF

POWER/

(VOL)

control

LOCK

switch

BALANCE

control

SUB

SQL

control

Fig.

1

2.

Turn

ON

the

DC

power

supply

and

then

turn

the

transceiver’s

power

switch

ON.

The

display

panel

will

indicate

as

shown

in

Fig.

1.

Additionally

some

control

and

key

lights

will

turn

on.

Note:

If

the

display

is

not

as

shown

Fig.

1

reset

the

micropro-

cessor

using

the

procedure

give

in

Microprocessor

memory

Initialization

Page

22.

3.

Turn

the

VOL

control

clockwise

until

a

signal

or

noise

from

MAIN

band

frequency

is

heard.

.

Rotate

the

MAIN

Tuning

control

and

select

an

open

channel.

Then,

turn

the

MAIN

SQL

control

clockwise

until

the

noise

disappears

and

the

BUSY

indicator

goes

OFF

(Threshold

point).

.

Slide

the

BALANCE

control

full

right

(SUB).

.

Rotate

the

SUB

Tuning

control

and

select

an

open

chan-

nel.

Then

slide

the

SUB SQL

control

to

the

right

until

the

noise

disappears

and

the

[B]

indicator

goes OFF.

[Dual

band

reception

|

(Simultaneous

reception

on

both

bands)

1.

Slide

the

BALANCE

control

to

the

middle.

2.

Select

the

desired

frequencies

in

each

band.

When

each

signal

is

received,

the

BUSY

or

the

[B]

indicator

will

turn

ON

and

each

S-meter

will

deflect.

3.

To

distribute

volume

among

MAIN

band

and

SUB

band,

slide

the

BALANCE

control

to

the

desired

point.

The

VOL

control

regultate

the

amount

volume

of

two

bands.

Single

band

reception

Press

the

DUAL

key.

The

SUB

band

frequency

display

will

turn

off.

Caution:

Turn

off

the

transceiver’s

POWER

switch

before

you

turn

off

the

power

supply,

or

if

in

a

vehicle,

before

you

stop

the

engine.

-

on

4-2-2.

Frequency

Selection

Frequency

can

be

changed

in

the

VFO

mode.

The

selected

frequencies

of

the

main

band

can

be

stored

in

the

Memory

channels,

and

the

Call

channel

(TM-621A/721A).

(See

Memory

Entry

page

23,

CALL

CHANNEL

page

25.)

You

can

select

the

VFO

mode,

MEMORY

Recall

mode,

and

CALL

Channel

mode

using

the

following

keys.

VFO

mode

MR/M

ve

—

key

VA

VFO

key

VFO

key

CALL

channel

mode

CALL

key

M

RY

Ch

|

mode

It

is

impossible

to

change

the

mode

directly

in

the

SUB

band.

It

is

possible

to

transfer

the

mode

of

the

MAIN

band

to/from

SUB

band.

Exchange

the

Band

Press

the

BAND

key.

Eachtime

the

BAND

key

is

pressed,

the

contents

of

the

SUB

band

are

exchanged

with

the

MAIN

band.

@

MAIN

BAND

@

VFO

mode

1.

Press

the

VFO

key

to

select

the

VFO

mode.

2.

Rotate

the

MAIN

Tuning

control,

MHz

keys,

or

Microphone

UP/DWN

swit-

ches

to

select

the

desired

frequency.

~~

.

Press

the

MR/M

key.

The

previously

.

Rotate

the

MAIN

Tuning

control

or

.

To

return

to

the

VFO

mode

press

the

.

Press

the

CALL

key

to

select

the

CALL

.

To

return

to

the

press

Memory

Recall

mode

selected

memory

channel

will

be

displayed

on

the

LCD

display.

Microphone

UP/DWN_

switches

to

select

the

desired

Memory

Channel.

VFO

key.

CALL

Channel

mode

(TM-621A/721A)

Channel

mode.

The

CALL

indicator

and

the

call

channel

frequency

are

dis-

played

on

the

LCD

display.

the

CALL

key

again.

Note:

The

Memory

Channel

number

will

not

disappear

during

the

CALL

channel

mode,

if

the

call

channel

is

selected

from

the

MR

mode.

@

SUB

BAND

@

If

the

current

frequency

is

in

VFO

©

mode;

Rotate

the

SUB

Tuning

control

to

select

the

desired

frequency.

@

If

the

current

frequency

is

in

MR

mode;

Rotate

the

SUB

Tuning

control

to

select

©

the

desired

Memory

Channel.

(The

a

Channel

number

is

not

displayed.)

®

Current

frequency

is

in

CALL

Channel

mode

(TM-621A/

721A);

Frequency

can

not

be

changed

in

the

SUB

band.

(The

CALL

Channel

indicator

is

not

displayed.)

4-2-3.

Frequency

Step

Selection

The

frequency

step

is

factory-set

to

the

following;

TM-721A

T™M-721E

TM-621A

144

MHz

Band

220

MHz

Band

430/440

MHz

Band

The

frequency

step

can

be

selected

by

using

the

following

procedures:

1.

Press

the

VFO

key

to

select

vo

the

VFO

mode.

If

you

are

already

in

the

VFO

mode

you

can

skip

this

step.

Pa)

re

oe

Fas

&

A

2.

Press

the

F

key.

The

F

in-

dicator

will

be

displayed

on

the

LCD

display.

Press

the

REV/STEP

key

wi-

thin

5

seconds.

(if

the

in-

dicator

goes

off,

you

must

press

the

F

key

again.)

The

current

frequency

step

will

be

displayed

on

the

LCD

display.

3.

Rotate

the

Tuning

control

or

press

the

Microphone

UP/DWN

switch

to

select

the

desired

frequency

Tuning

control

will

in-

oe

ere

re

ae

4.

To

complete

the

Frequen-

Automatically

return

5

|

—,.

|

Rotate

Press

UP

step.

The

accompanying

crease

or

decrease

the

(Hz)

cy

step

selection

press

the

clockwise

|

key

figure

shows

how

the

step

size.

Microphone

VFO

key

or

any

other

key.

switches

seconds

of

the

selection.

oe

Press

DWN

<—«

counter-

k

clockwise

ey,

It

is

impossible

to

select

the

Frequency

Step

directly

while

in

the

SUB

Band.

It

is

possible

to

transfer

the

selected

Fre-

quency

Step

of

the

MAIN

band

to

the

SUB

band.

Press

the

BAND

key.

17

4-2-4.

A.B.C.

(Automatic

Band

Change)

The

A.B.C.

function

allows

you

to

exchange

the

contents

of

SUB

band

to

the

MAIN

band

automatically

whenever

a

signal

is

received

in

the

SUB

band

and

SUB

squelch

is

open.

1.

Press

the

A.B.C.

key.

The

A.B.C.

indicator

will

A.B.C.

turn

on

displayed

in

the

cI

LCD

display.

(44805

FFesu0

2.

As

soon

as

a

signal

is

received

in

the

SUB

band,

exchange

the

bands.

*

=:

lf

press

the

PTT

switch,

A.B.C.

function

is

released.

If

does

not

press

the

PTT

switch

3

seconds

after

the

signal

goes

off,

the

MAIN

band

return

to

SUB

band.

Caution:

*

The

Tuning

controls

are

not

effective

during

this

exchange.

4-2-5.

BEEP

TONE

If

you

would

not

like

audio

confirmation

when

a

function

is

activated,

turn

the

POWER

switch

OFF.

Then

press

and

hold

the

MUTE

key

and

turn

ON

the

power

switch,

then

release

the

mute

key.

Repeating

this

procedure

will

turn

the

function

back

ON.

The

transceiver

supplies

audio

confirmation

according

to

the

accompanying

chart.

Key

operation

|

CALL,

REV,

TONE,

CTCSS,

F,

SCAN,

L.OUT,

AL,

A.B.C.,

MUTE,

DIM:OFF

144

MHz

MAIN

BAND,

SUB

BAND

OFF,

LOW

POWER

ON

SCAN

STOP

|

523.25

|

VFO

MODE

SELECTION

687.33

|

SIMPLEX

622.26

+

OFFSET

MR

MODE

SELECTION

To

complete

the

MEMORY

Entry

To

complete

the

CTCSS

Frequency

selection

220

MHz

selection

(TM-621A),

430

MHz

selection

(TM-721A/721E),

SUB

BAND

ON,

HI

POWER

ON

CALL,

REV,

TONE,

CTCSS,

SCAN,

L.OUT,

AL,

A.B.C.,

MUTE

ON

MEMORY

CHANNEL,

Tone

frequency,

Frequency

step

880.00

F

mode,

Split

channel

ON

Band

change

during

A.B.C.

1396.91

Key

operation

without

effect

4-3.

TRANSMITTER

OPERATION

Caution:

$$

—

——————_—_—______—__—_——_

1.

Ensure

that

an

antenna

with

a

low

standing

wave

ratio

(SWR)

is

attached

to

the

antenna

connector

before

at-

tempting

to

transmit.

Failure

to

provide

proper

termina-

tion

may

result

in

damage

to

the

final

amplifier

section.

2.

Always

check

to

ensure

the

frequency

is

clear

before

transmitting.

Note::<—$—_<—___—__—_—_

|.

The

use

of

LOW

power

is

recommended,

whenever

possi-

ble,

to

avoid

interfering

with

other

stations.

Transmit

1.

Select

the

desired

operating

frequency

in

the

MAIN

band

using

any

of

the

methods

previously

discussed.

2.

Check

the

frequency

to

see

if

it

is

occupied

before

you

transmit.

3.

Press

the

PTT

switch.

The

ON

AIR

indicator

will

light,

and

the

RF

meter

will

deflect

to

the

right.

Note:

———

$$$

$$

If

you

have

selected

the

LOW

power

position,

the

low

indicator

will

appear

in

the

display

and

the

RF

meter

will

only

deflect

slightly.

When

HI

power

has

been

selected

the

RF

meter

will

swing

full

scale.

Sah"

IR

Ah

.o.

DOF

Ro

4.

Speak

into

the

microphone.

The

recommended

distance

to

the

microphone

is

5

cm

(2

inches).

Note:

———————_—_—_$_

Talking

closer

may

result

in

overdeviation

of

your

transmit

signal,-

which

might

be

reported

as

a

loss

of

clarity

or

of

an

excessively

wide

transmit

signal.

Talking

too

far

away

may

result

in

reports

of

weak

audio.

5.

Release

the

PTT

switch

to

return

to

the

receive

mode.

The

ON

AIR

indicator

should

go

out,

and

the

RF

meter

will

return

to

zero.

Duplex

Operation

Pushing

the

PTT

switch

on

the

microphone

allows

the

simultaneous

reception

in

the

SUB

band

frequency

and

sending

in

a

MAIN

band

frequency.

Note:

——@__________

With

certain

relationship

between

the

sending

and

receiv-

ing

frequencies,

the

receiver

sensitivity

may

be

suppress-

ed.

4-4.

REPEATER

OPERATION

4-4-1.

TRANSMITTER

OFFSETS

All

amateur

radio

repeaters

utilize

a

separate

receiver

and

transmitter

section.

The

receiver

frequency

may

be

either

above

or

below

the

transmitter

frequency.

19

For

most

repeaters

offsets

are

as

follows:

144MHz

|

220MHz

|

«430/440

MHz

]

TM-621A

TM-721E

TM-721A

|

TM-621A

|

TM-721A

|

European

|

UK.

TM-721E

version

+600

kHz

|

+1.6

MHz|

+5

MH:

ee

soo

[18

Mi]

=

5

MHz

|

—

1.6

MHz

|

—

1.6

MHz

‘cs

—7.6

MHz

|

©

Offset

Direction

To

select

the

desired

transmitter

offset

direction

press

the

SHIFT

key.

Each

time

you

press

the

key

the

transceiver

will

advance

from

one

offset

to

the

other,

i.e.

+

to

—

(-

to

- —

with

European

version)

to

no

offset

(simplex).

The

transceiver

allows

you

to

store

the

frequency,

and

off-

set

in

memory,

or

you

can

select

these

functions

directly

from

the

keyboard.

®@

Auto-Offset

(TM-621A

only)

The

TM-621A

has

been

programmed

according

to

the

stan-

dard

ARRL

Band

Plan,

regarding

transmitter

offsets.

Please

see

the

accompanying

chart

for

additional

information.

You

can,

of

course,

override

this

by

using

the

SHIFT

function,

if

desired.

'S:

Simplex

Channel

146.00

146.60

147.40

148.00

144.00

145.10

sTs

=

s_y[st=

Gist

—

Ts

145150

146.40

147.00 147.60

220.000

223.920

224.995

si

5

L=

ts

20

4-4-2.

REVERSE

FUNCTION

Some

repeaters

utilize

a

‘‘Reverse

pair’,

i.e.

the

transmit/

receive

frequencies

are

exactly

the

reverse

of

another

repeater.

For

example

repeater

A

uses

146.000

for

a

transmit

frequency

(OUTPUT)

and

146.600

for

receive

(INPUT).

Repeater

B

uses

146.000

for

its

receive

and

146.600

for

its

transmit

frequency.

It

would

be

inconve-

nient

to

have

to

reprogram

the

transceiver

each

time

if

you

were

in

range

of

both

repeaters.

The

REV

key

allows

you

to

reverse

the

transmit

and

receive

frequencies.

To

use

the

REVERSE

function

press

the

REV

key.

The

offset

indicator

(

+

or

~—

/

—

or

—

)

will

flash

OFF

and

ON

in

the

display

to

remind

you

that

you

are

working

a

reverse

repeater

pair.

To

return

to

normal

offsets

press

the

REV

key

again.

This

function

is

also

useful

to

check

the

input

frequency

of

the

repeater,

so

that

you

can

determine

if

you

are

within

SIMPLEX

communications

range.

4-4-3.

TONE

OPERATION

Some

repeaters

require

the

use

of

a

control

signal

to

ac-

tivate

the

repeater.

Several

versions

are

currently

in

use

worldwise.

In

the

United States

sub-audible

tones

are

sometimes

used.

With

the

TM-621A/721A,

38

different

sub-audible

tone

frequency

selections

are

possible.

With

the

use

of

the

optional

sub-audible

tone

en-

coder/decoder

(TSU-6)

also

allows

for

CTCSS

(Tone

Squelch)

operations.

When

this

option

is

activated

the

squelch

of

the

SUB

band

will

only

open

when

the

proper

sub-audible

tone

is

received.

Kenwood TM-621A User manual

Popular Transceiver manuals by other brands