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INSTRUCTION

MANUAL

FT-902DM

YAESU

MUSEN

CO.,

LTD.

TOKYO

JAPAN

ALL

MODE

HF

TRANSCEIVER

FT-902DM

el

—_—

~~

SSS

SSS

Ss

[SESS

:

SSA

=

4a

GENERAL

DESCRIPTION

The

FY-902DM

is

a

precision

engineered,

high

per-

formance

HF

transceiver

of

advanced

design,

pro-

viding

all

band

coverage

(160,

80.40,

30.

20,

17,

15,

|2,and

|]Ometers)

on

all

modes

of

operation:

LSB,

USB,

CW,

FSK,

AM,

and

FM.

This

trans-

ceiver

operates

alan

input

power

of

180

watts

on

SSB/CW

and

80

watts

on

AM,

FM,

and

FSK.

Advanced

features

include

PLL

(Phase

Locked

Loop)

frequency

derivation,

digital

plus.

analog

frequency

readout

with

large

displuy

LED

digits,

a

built-in

Curtis

8044

IC

electronic

keyer,

and

memory

frequency

control

circuilry.

Staite-of-the-

art

receiver

performance

features

Include

rejection

tuning,

dualfilter

variable

IF

bandwidth

tuning,

and,

for

CW,

audio

peak

frequency

(APF)

tuning

for

unsurpassed

rejection

of

unwanted

signals.

Other

built-in

features

include

VOX,

semi-break-

in

CW

with

sidetone,

25

kHz

calibrator,

advanced

noise

blanker,

RF

speech

processor.

and

a

20

dB

RE

attenuator

for

protection

against

receiver

overload,

All

circuits,

except

the

transmilter

driver

and

final

amplifier

stages,

are

solid

state,

utilizing

modern

plug-in

printed

circuit

boards,

thus

per-

mitting

easy

maintenance.

The

FT-902DM

transceiver

is

entirely

self-con-

lained,

requiring

only

an

antenna

and

power

source

for

operation.

For

base

station

operation,

AC

power

voltages

of

LOO/110/117/200/220/234

VAC

may

be

chosen,

though

the

unit

normally

is

sup-

plied

with

117

volt

capability.

A

DC-DC

converter

unil

provides

fer

mobile

or

portable

operation.

Selection

of

AC

or

DC

power

source

is

automati-

cally

made

when

the

proper

line

cord

is

inserted.

For

mobile

operation

a

separate

switch

is

provided

on

the

front

panel

to

turn

olf

the

tube

heaters

while

in

the

receive

mode.

With

the

heaters

off,

current

consumption

is

only

1.1

amp.

Among

the

available

options

on

economy

models

FT-902D/SD/DE

are

the

memory

unit,

the

keyer

unit,

the

DC-DC

converter,

the

FM

unil,

and

the

cooling

fan.

Optional

equipment

on

all

modets

are

the

600

[lz

CW

filter

and

the

6

KHz

AM

filter.

The

entire

PT-902DM

transceiver

weighs

approxi-

mately

18

kg.,

and

is

342

mm

wide,

154

mm

high,

and

324

mm

deep.

A

diecast

front

panel

and

heavy-duty

case

provide

maximum

protection

against

damage

from

shock

and

vibration

during

travel

use.

SPECIFICATIONS

©

GENERAL

Frequency

coverage:

160m

1.8

-

2.0

MHz

80m

3.5

-

4.0

MHz

40m

7.0-

7.5

MHz

30m

10.0

-

10.5

MHz

20m

14.0

-

14.5

MHz

17m

18.0

-

18.5

MHz

15m

21.0

-

21.5

MHz

12m

24.5

-

25.0

MHz

10mA

28.5

-

28.5

MHz

10mB

28.5

-

29.0

MHz

10mC

29.0

-

29.5

MHz

10mD

29.5

-

29.9

MHz

Power

requirements:

AC

100/110/117/200/220/234

V,

50/60

Hz

DC

13.5

V,

negative

ground

(DC

option

FT-902D/SD/DE)

Power

consumption:

(FT-902DM/D/DE)

AC

117

V:

70

watts

receive

(45

watts

HEATER

OFF)

320

watts

transmit

(max)

DC

13.5

V:

5A

receive

(1.1

A

HEATER

OFF)

21

A

transmit

(max)

(FT-902SD)

AC

117V:

55

watts-receive

(45

watts

HEATER

OFF)

105

watts

transmit

(max)

DC

13.5

V:

3.8

A

receive

(0.8

A

HEATER

OFF)

7.5

A

transmit

(max)

Size:

342

(W)

x

154

(H)

x

324

(D)

mm

Weight:

I8kg

TRANSMITTER

Emission:

LSB,

USB

(A3j),

CW

(Al),

AM

(A3h),

FM

(F3)

(option

FT-902SD/DE),

FSK

(F1)

PA

input

power:

FT-902DM/D/DE

SSB/CW:

180

watts

DC

AM/FSK/FM:

80

watts

DC

FT-902SD

SSB/CW/FSK/FM:

20

watts

DC

AM:

5

watts

DC

:

Carrier

suppression:

Better

than

40

dB

Unwanted

sideband

suppression:

Better

than

40

dB

@

1000

Hz

Spurious

radiation:

Better

than

40

dB

below

rated

output

Transmitter

frequency

response:

300

-

2700

Hz

(6

dB)

Third

order

distortion

products:

Better

than

31

dB

below

rated

output

Transmitter

frequency

stability:

Less

than

300

Hz

after

10

minute

warmup:

less

than

100

Hz

after

30

minute

warmup.

Negative

feedback:

6

dB

at

14

MHz

Modulation:

A3J:

Balanced

modulator

A3h:

Amplitude

modulation

of

a

low

power

stage

F3:

Variable-reactance

frequency

modula-

tion,

max.

deviation

+5

kHz

(F3

fea-

ture

optional

on

FT-902SD/DE)

Antenna

output

impedance:

50-75

Ohms,

unbalanced

Microphone

input

impedance:

500

-

600

Ohms

RECEIVER

Passband

tuning:

Continuous

from

2.4

kHz

to

300

Hz

Sensitivity:

SSB/CW/FSK

0.25

pV

for

S/N

10

dB

Intermodulation:

AM

1

uv

for

S/N

10

dB

Better

than

80

dB

immunity

at

20

kHz

offset

FM

0.3

uV

for

20

dB

quieting

20

dB

inputs

at

14

MHz

Image

rejection:

Desensitization:

1.8-

25

MHz

-

-

Better

than

60

dB

Better

than

100

dB

immunity

at

20

kHz

off

28

MHz

-

-

Better

than

50

dB

20

dB

input

at

14

MHz

IF

rejection:

APF

response:

Better

than

70

dB

Within

3

dB

from

400

-

900

Hz

Selectivity,

WIDTH

control

at

“0”

Audio

output:

SSB:

-6

dB/2.4kHz

—60

dB/4.0

kHz

Better

than

3

watts

@

10%

THD

*CW:

-—6dB/0.6kHz

—60dB/1.2

kHz

*AM:

—6dB/6.0kHz

-—60

dB/12.0

kHz

Audio

output

impedance:

**FM:

—6

dB/12.0

kHz

—60

dB/24.0

kHz

ALAS

Ohms

*AM

and

CW

filters

are

optional,

all

models

**FM

UNIT

optional

on

FT-902SD/DE

FT-902D/SD/DE/DM

MODEL

DIFFERENCES

O

=

Built-in

feature

X

=

Available

option

FEATURE

"

FT-9020

|

FT-902SD

|

FT-902DE

'

FT-902DM

—

BANDCRYSTAL

160m

OO

O

See

ae

Oe.

BAND

CRYSTAL

80m

ss

O

om

cm

oO

|

BAND

CRYSTAL

40m

|

fe)

O

eo

if

oO

BAND

CRYSTAL

30m

|

eee

OT

ee

2

“BAND

CRYSTAL

20m

G2.

oO

|

O

Oo.

BAND

CRYSTAL

17m

Oo

|

om

30

ic)

-BANDCRYSTAL

15m

=|

O..—

O

Ge.

|

Onc!

BAND

CRYSTAL

12m

|

Or.

fon

it

ee

Oo.

|

BAND

CRYSTAL

—-10mA__

O

O

oO

oan

BAND

CRYSTAL

10mB

leg

Orch

—

JO

o.

-|.

=-6

_BAND

CRYSTAL

__10mC

“Or,

=

lit

OL

I

Or).

-

Oe

BAND

CRYSTAL

—_10mD

io

“©

O

0

-VOX/MARKER

UNIT

0

O

on

O-

FM

UNIT

as

em

al

oa

a

ae

%

O.

|

_RF

SPEECH

PROCESSOR

_

oO

O

sue),

i

Os

AM

FILTER

7

x

x x

XP

CW

FILTER

|

—,

x

Ne

x

4

FM

FILTER

=

x

.

a

a

x

_KEYER

UNIT

;

|

x

-.

or

eas)

MEMORY

UNIT

;

|

x

x

=

oe

ee

Cs

_DC-DC

CONVERTER

-

|

x

x

x

O

COOLING

FAN

o

|...

&

ec

or

|i

_POWER

OUTPUT

=

=

=—S

|s~Ss«100

W

10W-

100

W

100

W

TUBE

COMPLEMENT

12BY7A

1

6146B

2

SEMICONDUCTOR

COMPLEMENT

Germanium

Transistor:

T20A6

2

Silicon

Transistor

:

2SA496Y

2

2SA564A-R

2

2SA639

1

28A733

3

2SA952L

13

28C372Y

4

2SC380TM-Y

15

2SC535A

1

2SC732TM

5

2SC735Y

3

2SC785-O

3

2SC1674L

1

2SC1815Y

29

2SC1815GR

11

2S8C2407

2

MPSA13

1

FET:

2SK19GR

11

2SK19TM-BL

10

2SK34E

1

3SK40M

3

3SK51-03

9

3SK59Y

1

3SK59GR

1

3SK73

1

JF1033B

4

J310

1

Ic:

MC3403P

MC14011BCP

MC14042BCP

MC4044P

(uPC1008C)

TA7205AP

1

TA7063P

2

TA7061AP

2

TA7310P

|

TA7089M

1

TA7060P

1

I

2

3

1

1

]

NON

TC503

2P

uPC14305

uPC14308

uPC14312

uPAS4H

SN75450B

Specifications

subject

to

change

without

notice.

SN74LS192N

SN74LSO0ON

SN74LS04N

SN74LS123N

MSM5562

MSM9520RS

MM74C90N

NJM78LOS5A

NJM78L08

LM308

8044

34024PCQM

Germanium

Diode:

1N60

1S188FM

181007

Silicon

Diode:

181555

1SS53

10D1

10D10

VO6B

SM1-12

—

i

OND

Ss

RE

OND

SO

12

6

30

101

ee

WN

wo

ON

Varactor

Diode:

182209

2

182236

]

FC63

]

MV104

12

Zener

Diode:

WZ050

2

WZ060

1

WZ090

5

WZ110

2

Schottky

Barrier

Diode:

ND487C2

1

LED:

GD4-203SRD

12

LED

Display:

HP5082-7623

6

CONTROLS

AND

SWITCHES

This

transceiver

has

been

specifically

designed

for

ease

of

operation

and

versatility.

The

operator

may,

however.

be

unfamiliar

with

the

operation

of

the

controls,

and

improper

adjustment

thereof

may

result

in

poor

transceiver

performance.

Thus,

be

certain

that

you

understand

the

function

of

every

control

before

operating

the

transceiver,

The

various

front

panel

controls

and

switches

are

described

in

the

following

section,

/

(1)

MODE

The

MODE

switch

has

six

positions

for

selection

of

the

operating

mode

desired!

LSB,

USB,

CW.

FSK,

AM,

or

FM.

(2)

REJECT-WIDTH

The

REJECT

und

WIDTH

controls

are

mounted

on

concentric

shafts:

The

rejection

tuning

control

(REJECT).

when

activated

by

pressing

the

small

the

left

of

the

REJECT

knob,

provides

u

variable

IF

notch

filter

action

for

nulling

Oul

a

particular

interfering

signal,

silver

pushbutton.

to

The

WIDTH

control

varies

the

signal

across

the

passband

of

one

of

the

two

IF

8-pole

crystal

band-

pass

filters

used

in

this

circuit.

thus

providing

a

variable

IF

bandwidth

for

rejection

of

signals

above

or

below

the

desired

signal,

(3)

M

The

M

button

is

pressed

to

store

a

frequency

in

the

memory

circuitry.

Whatever

lrequency

is

being

read

out

on

the

digital

display

will

be

the

lrequency

stored

when

the

M

button

is

pushed.

mA

*

Tololeloioroy

mes

AH)

SEES

FOG

(4)

EXT

When

pushed,

the

EXT

button

transfers

frequency

control

from

the

FT-902DM

to

an

external

VFO,

such

as

the

FV-901DM

fully

synthesized

scanning

VFO.

(5)

VEO

When

the

VFO

button

is

pushed,

frequeney

con-

trol

is

transfered

from

EXT

or

memory

control

to

the

FT-902DM

internal

VFO,

(6)

TX-MR-RX

Once

a

frequency

has

been

stored

by

the

memory

(M)

button,

that

frequency

may

be

recalled

for

control

of

either

the

transmit

or

reeeive

frequency

by

pushing

either

the

TX

or

RX

MR

_

button,

respectively,

(7)

MR

Once

a

frequency

has

been

stored

by

the

memory

(M)

button,

that

frequency

may

be

recalled

for

control

of

the

transceive

frequency

by

pushing

the

MR

button.

(8)

PRESELECT

This

control

pretunes

the

signal

circuits

for

both

transmit

and

receive.

The

PRESELECT

circuit

provides

continuous

permeability

tuning

through-

out

the

frequency

range

of

the

transceiver.

(9)

BAND

The

BAND

switch

provides

selection

of

the

band

desired,

160

through

10

meters.

(10)

RF

GAIN/CLARIFIER

The

RE

GAIN

and

CLARIFIER

controls

are

mounted

on

concentric

shafts.

The

RF

GAIN

control

provides

manual

control

of

the

gain

levels

of

the

RF

and

IF

amplifiers

on

receive.

The

CLARIFIER

control

allows

manual

offset

of

42.5

kHz

of

either

the

transmit

or

receive

fre-

quency.

Selection

of

transmit

or

receive

clarifier

is

made

hy

the

two

silver

pushbuttons

to

the

left

of

the

CLARIFIER

control.

(11)

ATT

The

ATT

(RF

attenuator)

button

provides

inser-

tion

of

a

20

dB

attenuator

in

the

incoming

signal

path

to

minimize

receiver

cross

modulation

caused

by

extremely

strong

local

signals.

(12)

PROC

LEVEL/AF

GAIN

The

PROC

LEVEL

and

AF

GAIN

controls

are

mounted

on

concentric

shafts.

The

PROC

LEVEL

control

allows

manual

control

of

the

output

level

of

the

RF

speech

processor.

The

processor

is

actuated

by

pressing

the

silver

pushbutton

to

the

left

of

the

PROC

LEVEL

control.

The

AF

GAIN

control

adjusts

the

audio

output

level

at

the

speaker

and

phone

jack.

Clockwise

rotation

increases

the

audio

output.

(13)

TUNE

This

pushbutton,

when

depressed,

places

the

trans-

mitter

in

the

“tune”

condition

for

ten

seconds

for

tuning

purposes.

After

ten

seconds,

the

trans-

ceiver

is

returned

to

the

receive

mode

so

as

to

prevent

damage

to

the

final

amplifier

tubes

caused

by

excessive

“key

down”

time

during

tune-up.

(14)

LOADING

This

control

tunes

the

output

circuit

of

the

pi

net-

work

to

match

the

antenna/feedline

impedance.

(15)

PLATE

This

control

tunes

the

plate

circuit

of

the

final

amplifier.

(16)

DIM

This

control

allows

dimming

of

the

meter

and

dial

lamps.

(17)

CARR/KEYER

The

CARR

and

KEYER

controls

are

mounted

on

concentric

shafts.

The

CARR

control

varies

the

amount

of

carrier

in

the

CW,

AM,

FSK,

and

FM

models

of

operation.

The

KEYER

control

varies

the

speed

of

the

built-in

Curtis

8044

IC

electronic

keyer.

(18)

VOX

GAIN

This

control

selects

MOX/PTT/VOX

transmitter

relay

control

as

well

as

adjusting

the

sensitivity

of

the

VOX

circuitry.

The

PTT

position

provides

push-to-talk

operation

from

a

microphone

PTT

switch

or

a

footswitch.

The

MOX

position

provides

manual

transmit.

It

must

be

returned

to

the

PTT

position

for

receiver

recovery.

(19)

APF

FREQ

This

knob,

when

actuated

by

turning

on

the

APF

switch,

provides

manual

control

for

peaking

the

audio

peak

filter

(APF)

circuit

on

the

desired

signal.

This

control

will

find

its

chief

usefulness

on

CW,

because

its

bandwidth

is

much

too

narrow

for

normal

SSB

reception.

(20)

SQL/MIC

GAIN

The

SQL

and

MIC

GAIN

controls

are

mounted

on

concentric

shafts.

The

SQL

control

sets

the

squelch

threshold

level

for

FM

reception.

The

MIC

GAIN

control

varies

the

audio

level

from

the

microphone

amplifier

stage.

The

control

has

sufficient

range

to

permit

the

use

of

any

low

im-

pedance

(500

-

600

Ohm)

crystal

or

dynamic

microphone.

Clockwise

rotation

increases

the

level

of

output

from

the

microphone

amplifier

stage.

(21)

FUNCTION

SWITCHES:

AMGC,

APF/MONI,

AGC,

PO/IC/ALC,

and

NB/MARK

The

AMGC

switch

activates

a

microphone

gain

threshold

circuit

which

requires

a_

particular

minimum

input

level

from

the

microphone

to

trigger

the

microphone

amplifier.

Low-level

back-

ground

noise

will

not

activate

the

transmitter

with

the

AMGC

in

operation.

This

circuit

may

be

considered

a

‘“‘microphone

squelch”

system.

The

M

GAIN

control

functions

normally

with

the

AMGC

system

in

operation.

When

the

APF/MONI

switch

is

in

the

APF

posi-

tion,

the

audio

peak

filter

(APF)

circuitry

is

activated.

The

exact

frequency

of

the

audio

peak

is

set

by

the

APF

FREQ

knob.

When

this

switch

is

placed

in

the

MONI

position,

monitor-

ing

of

the

microphone

level

may

be

accomplished

for

operator

convenience

or

tape

recording

both

sides

of

a

QSO.

In

the

CW

mode,

CW

sidetone

will

be

heard

regardless

of

the

position

of

the

APF/MONI

switch.

The

AGC

switch

controls

the

length

of

the

re-

covery

time

for

the

receiver

AGC

circuitry.

This

switch

provides

slow

or

fast

recovery,

and

will

also

turn

off

the

AGC

if

desired.

The

PO/IC/ALC

switch

will

hereafter

be

referred

to

as

the

METER

switch.

In

the

PO

position,

relative

transmitter

output

power

can

be

observed.

In

the

IC

position,

transmitter

final

amplifier

cathode

current

may

be

measured.

In

the

ALC

position,

transmitter

ALC

voltage

may

be

read.

When

the

FT-902DM

is

in

the

receive

mode,

the

meter

functions

as

an

“‘S”’

meter.

The

NB/MARK

switch

provides

for

actuation

of

either

the

Noise

Blanker

(NB)

or

crystal

calibrator

(MARK).

The

marker

oscillator

can

produce

cali-

bration

signals

at

intervals

of

either

25

kHz

or

100

kHz

by

proper

positioning

of

a

switch

inside

the

cabinet.

(22)

POWER

This

is

the

main

on/off

switch

for

the

transceiver.

In

the

OFF

position,

the

memory

circuits

are

disabled,

so

that

when

the

transceiver

is

turned

to

ON

again,

the

memory

circuits

will

have

to

be

reset.

(23)

HEATER

With

the

HEATER

switch

in

the

down

position,

the

transmitter

tube

heaters

are

turned

off.

This

reduces

battery

drain

to

1.1

amp

and

thus

permits

long

periods

of

listening

without

excessive

battery

drain.

Placing

this

switch

in

the

up

position

pro-

vides

supply

voltage

to

the

tube

heaters,

and

after

30

seconds

of

warmup

the

transmitter

is

ready

for

operation.

This

switch

operates

in

both

the

AC

and

DC

modes.

(24)

PHONES

This

is

a

standard

1/4”

phone

jack

for

accom-

modation

of

headphones.

The

internal

speaker

is

disabled

when

headphones

are

plugged

into

this

jack.

(25)

MIC

This

four-conductor

jack

accommodates

the

microphone

plug

for

microphone

input

as

well

as

for

PTT

actuation.

MIC

Mic

plug

Headphone

plug

REAR

APRON

CONNECTIONS

(1)

GND

Threaded

lug

for

ground

connection.

(2)

RF

OUT

Signal

frequency

output

from

the

driver

stage

may

be

obtained

at

this

jack

for

use

with

optional

equipment,

such

as

the

FTY-90O1R

transverter.

(3)

ANT

Coaxial

conneclion

for

antenna.

(4)

PO

ADJ

Sets

PO

meter

sensitivity.

(S)

RCV

ANT

A

second

receiver

receives

its

antenna

connection

through

this

jack,

(6)

ACC

Accessory

socket.

Provides

access

to

transceiver

operating

voltages

and

relay

contacts.

(7)

KEY

Three-conductor

jack

for

connection

to

keyer

paddle

or

external

key,

(8)

EXT

VFO

Connections

for

external

VFO.

ral

(9)

FUSE

Fuse

holder

requires

5

amp

fuse

for

117

volt

or

3

amp

fuse

for

220

volt

operation,

For

12

volt

DC

operation,

a

20

amp

fuse

ts

installed

in

the

power

cable,

When

replacing

fuses,

be

certain

to

install

a

fuse

of

the

proper

rating.

The

caused

by

improper

fuse

warranty

does

not

cover

damage

replacement.

(10)

POWER

Power

receptacie.

Both

AC

and

DC

cables

are

supplied.

(11)

TONE

Sidetone

output

for

second

receiver

(if

used).

(12)

IF

OUT

2

Wide-bandwidth

8.9

MHz

IP

signal

for

connection

to

a

spectrum

analyzer,

ete,

(13)

PATCH

Speech

input

terminal

for

phone

patch

connection.

Impedance

is

500

ohms,

(14)

A-TRIP

Anti-trip

input

from

second

receiver

(if

used).

(15)

SP

Audio

output

is

provided

at

this

jack

for

an

ex-

ternal

speaker.

Outpul

impedance

ts

4

ohms,

and

the

internal

speaker

will

be

disabled

when

plug

is

inserted.

(16)

PTT

This

jack

may

be

used

for

external

actuation

of

the

transmitter.

As

an

example,

a

footswitch

may

be

connected

to

this

jack

to

provide

remote

con-

PIN

No.

;

;

1

HEATER

trol

of

the

transmitter

relay,

leaving

the

operator’s

2

HEATER

hands

free

for

writing

and

tuning

purposes.

4

+300V

5

+800V

6

—100V

7

ALC

(17)

FSK

9

TX

GND

.

10

RX

GND

Input

from

the

FSK

terminal

may

be

made

WNC

through

this

jack.

The

FT-902DM

is

set

up

for

1

170

Hz

shift.

eens

(18)

IF

OUT

1

Narrow

bandwidth

8.9

MHz

IF

output

is

avail-

KN

able

for

use

with

an

IF

monitorscope,

etc.

PExTIN

3

EXT

OV

(19)

REMOTE

4

AGC

OUT

5

TX12V

6

GND

Provides

switched

13.5

VDC

for

relay

control

for

external

low-pass

filter

units,

etc.

As

the

band-

EXT

VFO

PLUG

switch

is

rotated,

13.5

VDC

will

appear

at

various

pins

on

the

REMOTE

jack.

Use

a

VOM

to

deter-

mine

the

proper

pin

for

the

band

in

use.

—

i

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MMON

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plug

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fan

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speaker

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