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INSTRUCTION

MANUAL

FT-223

Y

AESU

MUSEN

CO.,

LTD.

TOKYO

JAPAN

TABLE

OF

CONTENTS

GENERAL

Page

1

SPECIFICATIONS

Page

4

INSTALLATION

-

General

Page

5

-

Mobile

Installation

Page

6

-

Base

Station

Installation

Page

8

CONTROLS

&

SWITCHES

Page

8

REAR

PANEL

CONNECTIONS

Page

10

OPERATION

Page

11

THEORY

OF

OPERATION

-

General

Page

12

-

Transmitter

Section

Page

12

-

Receiver

Section

Page

14

-

Tone

Burst

Circuit

Page

16

-

Tone

Squelch

Circuit

(Optional)

Page

16

MAINTENANCE

---=

-

General

Page

18

-

Routine

Maintenance

Page

19

-

Adjustments

Page

20

-

Expanding

Channel

Capabilities

Page

24

-

Trouble

-shooting

Page

26

RESISTANCE/VOLTAGE

CHARTS

Page

27

PARTS

LIST

Page

28

FT-223

2

METER

FM

TRANSCEIVER

GENERAL

The

model

FT-223

is

a

compact

transceiver

specifically

designed

to

provide

high

performance

for

amateur

VHF

/FM

service.

The

transceiver

is

completely

solid

state

with

provision

for

operation

of

up

to

23

crystal

controlled

channels

between

144

and

148

MHz.

The

advanced

circuit

design

features

prevent

damage

to

the

transistors

in

case

of

high

antenna

VSWR,

or

reversed

power

supply

polarity,

while

an

adjustable

"tone-burst"

generator

is

included

for

repeater

actuation.

An

additional

feature,

is

an

optional

tone

squelch

circuit

for

a

selective

calling

system.

The

heavy

gauge

metal

case

provides

an

extremely

rugged

package,

light

in

weight,

yet

virtually

immune

to

the

effects

of

shock

and

vibration.

The

FT-223

VHF

/FM

transceiver

is

supplied

complete

with

all

mounting

hardware,

cables,

connectors

and

accessories

required

for

a

mobile

installation,

as

shown

in

Figure

1.

- 1 -

CD

®

®

(J)

®

Figure

1.

1.

Transceiver

with

built-in

3

11

speaker

(3

channels

factory

installed).

2.

Dynamic

push-to-talk

microphone

with

retractable

coiled

cord.

3.

Universal

mounting

bracket

(with

screws,

washers

and

nuts).

4.

Power

cable

(with

cigarette

lighter

adapter).

5.

Spare

£uses.

6.

Microphone

hanger.

7.

Miniature

phone

plug

for

external

speaker.

8.

Alignment

tool.

9.

Tap

connector.

- 2 -

HOW

TO

USE

THE

TAP

CONNECTOR

Do

NOT

strip

i~

lation

from

wires.

1.

2.

3.

4.

5.

6.

The

tap

connector

will

handle

most

wire

sizes

used

in

automotive

instrument

panels.

Slide

the

"hot"

lead

into

tap

connector

as

shown.

Insert

transceiver

power

lead

3

/4

of

the

way

into

connector

(just

past

metal

connector

element).

Using

pliers,

press

the

metal

connector

element

until

it

is

FLUSH.

Fold

the

hinged

cover

over

the

connector

element

and

snap

firmly

in

place.

PLASTIC

INSULATOR

WITH

HINGED

"SNAP-IN''

COVER

CONNECTION

MADE

WITH

ANY

PLIERS

TYPE

TOOL

BY

DRIVING

ELEMENT

OVER

WIRES

_POWER

TO

TRANSCEIVER

SLOT

FOR

SIDE

ENTRY

OF

"HOT"

WIRE

Figure

2

- 3 -

~WIRES

SELF-STRIPPING

''U''

TYPE

SPRING

PRESSURE

CONNECTOR

ELEMENT

The

compact

design

of

the

FT-223

transceiver

makes

it

ideal

for

mobile

installation,

operating

directly

from

the

vehicle

's

12

Volt

battery.

For

base

station

use,

an

accessory

model

,

FP-2

Two-Way

Power

Supply,

provides

operating

voltage

plus

a

large

external

speaker.

SPECIFICATIONS

GENERAL

Frequency

Coverage

Number

of

Channels

Speaker

Microphone

Power

Requirement

Current

Consumption

Metering

Dimensions

Weight

TRANSMITTER

RF

Output

Frequency

Stability

Crystal

Multiplication

Modulation

Deviation

- 4 -

144

to

146

MHz

or

146

to

148

MHz

23

(3

channels

supplied)

an

optional

external

VFO

can

be

used

Internal

3

11

dynamic

speaker

with

provision

for

connecting

external

4

ohm

dynamic

speaker

Dynamic

push-to-talk

microphone

with

retractable

coiled

cord

13.

5

Volts

DC,

+10%

0.

45

Amp

receive

1.

2

Amp

transmit

(LOW)

2.

3

Amp

transmit

(HI)

Illuminated

front

panel

meter

indicates

relative

received

signal

strength

and

transmitter

power

output

180

(W)

x

60

(H) x

220

(D)

mm

2.

5

Kg

10

Watts

(HI)

or

1

Watt

(LOW)

into

50

ohm

load

at

13.

5

Volts

DC

+0.002%

12

times

F3

(phase

modulation)

Up

to

±_10

kHz

(factory

adjusted

at

+5

kHz)

Audio

Response

Spurious

Emissions

Tone

Burst

RECEIVER

Type

Intermediate

Frequency

Sensitivity

Selectivity

Audio

Output

+

1,

-3

dB

of

6

dB

/

Octave

pre

-emphasis

characteristic

from

300

to

2500

Hz

60

dB

below

carrier

minimum

Nominally

one

second

at

1800

Hz

(adjustable

between

1300

&

3000

Hz)

Double

conversion

superheterodyne

(

crystal

controlled)

10.

7

MHz

first

IF;

455

kHz

second

IF

-4

dB

for

20

dB

quieting

±_6

kHz

at

6

dB;

+

12

kHz

at

60

dB

2

Watts

at

4

ohms

INSTALLATION

GENERAL

The

model

FT-223

transceiver

is

designed

primarily

for

mobile

service,

requiring

only

an

antenna

and

a

13.

5

Volts

DC

power

source

for

operation.

However,

when

operated

in

conjunction

with

model

FP-2

Two-Way

Power

Supply,

the

transceiver

provides

an

efficient

compact

base

station.

The

FP

- 2

power

supply

provides

13.

5

Volts

DC

to

operate

the

transceiver

from

an

AC

power

source.

The

transceiver

has

been

factory

pre-tuned

and

requires

no

adjustments

for

normal

operation

into

a

50

ohm

load.

The

antenna

location

is

the

most

important

consideration

in

either

a

base

or

mobile

installation,

with

effective

communication

range

directly

related

to

antenna

height.

The

antenna

should

always

be

in

the

clear

and

as

high

as

possible,

however,

a

minimum

distance

of

5

feet

should

be

maintained

between

the

VHF

and

other

antennas.

Also,

in

mobile

installation,

it

is

advisable

to

locate

the

antenna

as

far

from

the

engine

as

practical,

in

order

to

minimize

ignition

noise

pick-up.

In

all

installations

ensure

that

the

antenna

VSWR

is

less

than

1.5:1.

For

mobile

installation,

the

most

popular

antenna

types

are

either

a 1

/4

wave

whip

with

unity

gain,

or

a 5 / 8

wave

affording

approximately

3.

5

dB

gain.

Mobile

antennas

are

available

from

most

dealers

who

handle

two-way

mobile

radip

equipment,

or

other

local

electronic

suppliers.

- 5 -

To

minimize

losses

in

the

antenna

system,

use

the

shortest

length

of

coaxial

cable

that

is

practical,

avoiding

any

sharp

angles

or

kinks.

Use

type

RG-8

/U

cable

if

the

transmission

line

length

exceeds

25

feet,

while

RG-58

/U

is

suitable

for

shorter

lengths.

For

all

bends,

form

the

cable

into

a

radius

not

less

than

10

times

its

diameter.

MOBILE

INSTALLATION

In

mobile

service

the

FT-223

should

be

installed

where

the

controls,

indicators,

and

microphone

are

easily

visible

and

accessible

for

operation.

The

unit

may

be

mounted

in

any

position

without

loss

of

performance

.

.Suitable

locations

are

under

the

dash,

atop

the

transmission

tunnel,

etc.

A

universal

bracket

is

supplied

with

the

transceiver

for

this

purpose.

Install

the

FT-223

as

follows

(

refer

to

Figure

3):

1.

Use

the

universal

mounting

bracket

as

a

template

to

locate

the

mounting

holes.

Use

a 3 /

16"

diameter

drill

for

these

holes

and

allow

clearance

for

the

transceiver,

its

controls

and

the

connecting

cables.

Secure

the

mounting

bracket

with

the

screws,

washers

and

nuts

supplied

as

shown

in

"3A

11

,

Figure

3A.

2.

Install

the

transceiver

in

the

mounting

bracket,

securing

with

the

four

knurled

head

screws

and

washers

as

shown

in

11

3B

11

,

Figure

3B.

- 6 -

Figure

3C

4.

The

supplied

power

cable

may

be

plugged

directly

into

the

vehicle

Is

cigarette

lighter

receptacle

for

casual

operation

if

desired.

For

a

permanent

installation,

the

lighter

plug

may

be

removed

and

the

leads

routed

directly

to

the

battery

(

red

positive,

black

negative

or

ground),

or

the

nearest

termination

to

the

battery;

i.e.

ignition

switch,

fuse

block,

etc.

If

it

is

necessary

to

extend

the

power

leads,

use

#16

AWG

insulated

copper

wire

and

do

not

extend

the

leads

further

than

required

to

prevent

excessive

voltage

drop.

CAUTION

--------------

--------------

Before

connecting

the

power

cable

to

the

transceiver,

check

the

battery

voltage

with

the

engine

running

(battery

charging).

If

the

voltage

exceeds

14

Volts

DC,

the

regulator

should

be

readjusted

so

the

highest

charging

rate

does

not

exceed

14

Volts.

Also,

be

sure

to

observe

proper

polarity

when

making

battery

connections

(

reversed

polarity

will

not

damage

the

FT-223

due

to

the

protective

circuitry

incorporated

in

the

design,

however,

the

equipment

will

not

operate

under

this

condition).

- 7 -

5.

Connect

the

power

cable

to

the

POWER

receptacle

on

the

rear

panel.

6.

Connect

the

50

ohm

antenna

cable

to

the

ANT

receptacle

on

the

rear

panel.

7.

Connect

the

microphone

cable

to

the

4-pin

microphone

receptacle

on

the

front

panel.

8.

An

external

4

ohm

speaker

may

be

connected

at

the

SP

receptacle

on

the

rear

panel

if

desired

(this

automatically

disconnects

the

internal

speaker).

Use

the

external

speaker

plug

supplied.

BASE

STATION

INSTALLATION

As

a

base

station,

the

FT-223

requires

a

source

of

13.

5

Volts

DC

at

2.

6

amperes.

This

source

may

be

obtained

from

the

accessory,

FP-2

power

supply.

CONTROLS

&

SWITCHES

The

FT-223

VHF

/

FM

transceiver

has

been

designed

for

ease

of

operation.

Be

sure

you

thoroughly

understand

the

function

of

each

control

and

indicator

before

operating

the

equipment.

The

operating

functions

are

as

follows.

FT-223

VHF

/FM

TRANSCEIVER

Figure

4.

- 8 -