Yaesu Ft-901dm Manual

MAINTENANCE

SERVICE

MANUAL

FT-901DM

YAESU

MUSEN

CO.,LTD.

C.P.0.

BOX

1500

YAESU

ELECTRONICS

CORP.

P.O.

BOX

498

PARAMOUNT,

CALIFORNIA,

90723

(Page)

FOREWORD)

26

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SECTION

1

—

GENERAL

DESCRIPTION:

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SPECIFICATIONS

RECOMMENDED

ACCESSORIES

CONTROLS

AND

SWITCHES

..........

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INTERCONNECTION

DIAGRAMS

INSTALLATION

(0):

150.

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(9),

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MICROPHONE

CONNECTIONS

SECTION

2

—

TECHNICAL

NOTES

PARTS

DESIGNATIONS

ON

CIRCUIT

BOARDS

SIGNAL

TRACING

IN

THE

FT-901

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OF

ACCESSORIES

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UNITS

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20.0.0

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3-6

FM

UNIT

COOLING

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AND

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3-10

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TRACE

REPAIR

...

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3-11

MODIFICATIONS

VFO

DRIFT

IN

PRESENCE

OF

NEARBY

VHF

TRANSMITTER............+-+++

3-13

MEMORY

UNIT

HUM,

MR

MODE

............06

25

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3-14

COUNTER

UNIT

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SUPPLY

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.........-

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FREQUENCY

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3-18

MOSFET

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PROCESSOR/XTAL

UNIT

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SW.

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SECTION

4

—

REPAIR

PARTS

EIST

AND)

ORDERING:

DABA

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2:3

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4-5

FOREWORD

The

purpose

of

this

manual

is

to

provide

the

reader

with

the

information

required

to

keep

his

or

her

FT-

901

transceiver

in

top

operating

condition.

While

we

have

made

every

effort

to

provide

an

in-depth

technical

analysis

of

the

workings

of

this

equipment,

we

have

attempted

to

tailor

this

manual

toward

the

technician

or

owner,

rather

than

the

design

engineer.

To

this

end,

we

have

relied

heavily

on

drawings

and

diagrams.

Use

of

this

manual

is

entirely

at

the

owner’s

risk.

While

we

believe

that

the

information

presented

herein

is

correct

and

factual,

we

assume

no

responsibility

for

damage

to

your

equipment

when

this

manual

is

used

as

reference.

Moreover,

if

your

test

equipment

is

not

equal

to

the

task

of

performing

alignments

the

right

way,

we

would

strongly

urge

you

to

refer

the

unit

to

a

qualified

service

center.

We

truly

hope

that

the

test

information,

parts

location

data,

and

modification

information

presented

herein

will

be

sufficient

to

your

needs.

The

author

wishes

to

express

his

gratitude

to

the

engineering

and

service

staffs

of

Yaesu

Musen

Co.,

Ltd.

and

Yaesu

Electronics

Corporation,

whose

skill

and

insights

have

contributed

significantly

to

the

completion

of

this

manual.

Special

thanks

go

to

Mr.

Y.

Morii

for

his

help

in

assembling

the

technical

materials

presented

herein.

CL

Muay

Chip

Margelli,

K7JA

Public

Relations

Manager

Yaesu

Musen

Company,

Ltd.

Tokyo,

Japan

Copyright

©

1979

Yaesu

Musen

Co.,

Ltd.

All

rights

reserved.

No

portion

of

this

manual

may

be

reproduced

without

the

permission

of

Yaesu

Musen

Co.,

Ltd.

Printed

in

Japan.

A

BRIEF

HISTORY

OF

THE

FT-901

SERIES

The

FT-901

transceiver

first

appeared

in

the

USA

early

in

1978

and

immediately

established

a

position

of

pre-eminence

among

“top-of-the-line”

transceivers

on

the

market.

The

FT-901

series

has

brought

a

number

of

never-before-possible

technical

features

to

the

amateur

community,

along

with

traditional

Yaesu

quality

design

and

purity

of

emissions.

The

receiver

section,

in

particular,

has

impressive

credentials.

A

dual-filter

variable

IF

bandwidth

control

allows

continuous

variation

of

the

IF

passband,

from

2.4

kHz

down

to

300

Hz.

Also

included

is

a

rejection

tuning

control,

for

nulling

out

of

any

interfering

signal

within

the

remaining

IF

passband.

For

CW,

and

audio

peak

filter

(APF)

provides

a

significant

reduction

in

background

noise,

in

addition

to

razor-

sharp

selectivity.

The

receiver

dynamic

range

—

typically

well

in

excess

of 85

dB

in

CW

bandwidth

—

is

the

best

ever

achieved

in

a

production-line

amateur

solid-state

receiver.

The

transmit

side

includes

RF

negative

feedback

for

purity

of

emissions.

A

Curtis

8043

IC

keyer

is

built-in

on

the

FT-901DM/DE

models,

providing

high

reliability

and

immunity

to

RF

interference.

Another

innovation

is

the

10-second

TUNE

button,

which

activates

the

transmitter

for

10

seconds

for

tuning

purposes,

then

returns

the

rig

to

receive,

thus

saving

the

final

tubes

from

excessive

key-down

time.

The

most

exciting

feature

of

the

FT-901

series

is

the

memory

system,

which

provides

for

storage

and

recall

of

any

frequency

for

control

on

transmit,

receive,

or

transceive.

This

one

feature

largely

eliminates

the

need

for

an

external

VFO

in

the

traditional

sense.

That

the

FV-901DM

synthesized

scanning

external

VFO

is

hardly

traditional

bears

this

point

out.

With

coverage

on

all

modes

(SSB,

CW,

AM,

FSK,

and

FM)

on

all

bands

from

160

through

10

meters,

the

FT-901

series

is

destined

to

maintain

its

position

of

dominance

among

top

transceivers

on

the

market.

With

some

2800

components

assembled

in

one

box,

for

a

finite

price

tag,

the

FT-901

offers

more

performance

per

dollar

than

any

other

piece

or

collection

of

equipment

on

the

market.

GENERAL

ALL

MODE

HF

TRANSCEIVER

FT-901DM

GENERAL

DESCRIPTION

The

FT-901DM

is

a

precision

engineered,

high-

performance

HF

transceiver

of

advanced

design,

providing

all

band

coverage

(160

-

10

meters)

on

all

modes

of

operation:

LSB,

USB,

CW,

FSK,

AM,

and

FM.

This

transceiver

operates

at

an

input

power

of

180

watts

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

display

LED

digits,

a

built-in

Curtis

8043

IC

electronic

keyer,

and

memory

frequency

control

circuitry.

State-of-the-

art

receiver

performance

features

include

rejection

tuning,

dual-filter

variable

IF

bandwidth

tuning.

and,

for

CW,

an

audio

peak

filter

(APF)

for

un-

surpassed

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

RF

attenuator

for

protection

against

receiver

overload.

All

circuits,

except

the

transmitter

driver

and

final

amplifier

stages,

are

solid

state,

utilizing

modern

plug-in

printed

circuit

boards,

thus

per-

mitting

easy

maintenance.

The

FT-901DM

tained,

requiring

only

an

antenna

and

power

source

for

operation.

For

base

station

operation,

AC

es

of

100/110/117/200/220/234

VAC

may

be

chosen,

though

the

unit

normally

is

sup-

plied

with

117

volt

capability.

A

DC-DC

converter

unit

provides

for

mobile

or

portable

operation.

Selection

of

AC

or

DC

power

source

is

automati-

cally

made when

the

proper

line

cord

is

inserted.

transceiver

is

entirely

self-con-

power

vo

For

mobile

operation

a

separate

switch

is

provided

on

the

front

panel

to

turn

off

the

tube

heaters

the

receive

mode.

With

the

heaters

off,

while

in

current

consumption

is

only

1.1

amp.

Among

the

available

options

on

economy

models

FT901D/SD/DE

are

the

memory

unit,

the

keyer

unit,

the

DC-DC

converter,

the

FM

unit,

and

the

cooling

fan.

Optional

equipment

on

all

models

are

the

600

Hz

CW

filter

and

the

6

kHz

AM

filter.

The

entire

FT-901DM

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.

GENERAL

SPECIFICATIONS

GENERAL

TRANSMITTER

Frequency

coverage:

Emission:

160m

1.8

-

2.0

MHz

80m

3.5

-

4.0

MHz

40m

7.0

-

7.5

MHz

20m

14.0

-

14.5

MHz

15m

21.0

-

21.5

MHz

10mA

28.0

-

28.5

MHz

10mB

28.5

-

29.0

MHz

10mC

29.0

-

29.5

MHz

10mD

29.5

-

29.9

MHz

WWV/JJY

15.0-

15.5

MHz,

RX

only

Power

requirements:

AC

100/110/117/200/220/234

V,

50/60

Hz

DC_

13.5

V,

negative

ground

(DC

option

FT-901D/SD/DE)

Power

consumption:

(FT-901DM/D/DE)

AC

117V:

70

VA

receive

(45

VA

HEATER

OFF)

320

VA

transmit

(max)

55

VA

receive

(45

VA

HEATER

OFF)

105

VA

transmit

(max)

DC

13.5

V:

(FT-901S)

AC

117V:

55

watts

receive

(45

watts

HEATER

OFF)

105

watts

transmit

(max)

3.8

A

receive

(0.8

A

HEATER

OFF)

7.5

A

transmit

(max)

DC

13.5

V:

Size:

342

(W)

x

154

(H)

x

324

(D)

mm

Weight:

18

kg

LSB,

USB

(A3j),

CW

(Al),

AM

(A3h),

FM

(F3)

(option

FT-901SD/DE),

FSK

(F1)

PA

input

power:

FT-901DM/D/DE

SSB/CW:

180

watts

DC

AM/FSK/FM:

80

watts

DC

FT-901SD

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

Stability:

Less

than

300

Hz

drift

from

a

cold

start;

less

than

100

Hz

drift

over

a

30

minute

period

after

warm-up

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-901SD/DE)

Antenna

output

impedance:

50-75

Ohms,

unbalanced

Microphone

input

impedance:

500

-

600

Ohms

RECEIVER

Sensitivity:

SSB/CW/FSK

0.25

pV

for

S/N

10

dB

AM

1

pV

for

S/N

10dB

FM

0.3

wV

for

20

dB

quieting

Image

rejection:

1.8

-

21

MHz

-

Better

than

60

dB

28

MHz

-

Better

than

SO

dB

IF

rejection:

Better

than

70

dB

Selectivity,

WIDTH

control

at

“0”

SSB:

-—6dB/2.4kHz

—60

dB/4.0

kHz

*CW:

—6dB/0.6kHz

-—60

dB/1.2

kHz

*AM:

—6dB/6.0kHz

—60dB/12.0

kHz

**FM:

—6

dB/12.0

kHz

—60

dB/24.0

kHz

*AM

and

CW

filters

are

optional,

all

models

**FM

UNIT

optional

on

FT-901SD/DE

GENERAL

Passband

tuning:

Continuous

from

2.4

kHz

to

300

Hz

Two-tone

dynamic

range:

Typically

well

in

excess

of

85

dB

(20

kHz

spacing,

14

MHz,

600

Hz

bandwidth)

APF

response:

Within

3

dB

from

400

-

900

Hz

Audio

output:

Better

than

3

watts

@

10%

THD

Audio

output

impedance:

4-16

Ohms

FT-901D/SD/DE/DM

MODEL

DIFFERENCES

O

=

Built-in

feature

X

=

Available

option

FEATURE

FT-901D

FT-9018D

|

FT-901DE

|

FT-901DM

BAND

CRYSTAL

160m

° °

°

BAND

CRYSTAL

80m

° °

BAND

CRYSTAL

40m

°

O°

°

BAND

CRYSTAL

15m

°

|

°

BAND

CRYSTAL

__10mA

eS

i.

6

oi

O

BAND

CRYSTAL

_10mB

°

oe

|

°

BAND

CRYSTAL

10m

eo

_

|

° ° °

BANDCRYSTAL

—_10mD

re)

|

°

BAND

CRYSTALWWV/JY

RCV.

|

OO

3

°

VOX/MARKER

UNIT

°

FM

UNIT

°

|

x

a.

|

°

RF

SPEECH

PROCESSOR

[0

° ° °

AM

FILTER

x x

x

X

CW

FILTER

x

KEYER

UNIT

x

|

x

lo)

°

MEMORY

UNIT

x

3

DC-DC

CONVERTER

x x x

°

COOLING

FAN

3

x

°

3

POWER

OUTPUT

100

W

10

W

100

W

100

W

GENERAL

TUBES

AND

SEMICONDUCTORS

TUBE

COMPLEMENT

FET:

MSMSS01

1

Varactor

diodes:

2SK19GR

15

MSM5562

1

1$2209

2

12BY7A

1

2SK19BL

8

MSMS564

1

182236

1

6146B

2.

2SK34E

1

SN75450B

1

FC63

1

3SK40M

14

SN76514N

1

MV

104

10

SEMICONDUCTOR

3SKS9Y

1

SN74LSOON

2

7

;

:

COMPLEMENT

3SKS9GR

1

SN74L04N

3

Silicon

varistor

diodes:

JF1033B

5

SN74LS90N

1

MVI3

!

Germanium

transistors:

SN74LS123N

1

Zener

diodes:

T20A6

z

Ic

SN74LS192N

5

wz0s0

2

=n

F

BOD

u

TA7060P

1

WZ090

4

Silicon

transistors:

uPC78LOS

2

2SAS64A

2

uPC78L08

gi.

—

seiOa

lee

5

Wzu0

?

i

TA7063P

2

2SA639

1

wPC14305

2

TA7080M

|

__

Light-emitting

diodes:

2SA733

4

uPC14308

2

EAT205AP

|

GD4-203SRD

Hl

peels

205

28C372Y

3

wPC14312

1

TA7310P

1

.

ase

28C373

10

F4024CP

1

TC5032P

i

Light-emitting

display:

2SC535A

1

F40192

2

mice:

HPS082-7740

6

2SC735Y

3

LM308

1

Germanium

diodes:

2SC7850

5

MCI416P

1

IN60

17

28C945

3.

_MC3403P

1

1S188FM

6

2SC1000GR

5

MC4044P

2

1$1007

(GB)

22

2SC1815GR

2

(HPC1008C)

(1N270)

2SC1815Y

49

MC14011B

3

2N4427

I

MC14042B

5

Silicon

diodes:

MPSA13

1

MM74C90

1

181555

89

MSL980Y7

!

10D1

7

MSL980Y4

1

10D10

8

MSMS61

3

VO6B

2

Specifications

subject

to

change

without

notice.

GENERAL

RECOMMENDED

ACCESSORIES

FV-901DM

SYNTHESIZED,

SCANNING

REMOTE

VFO

The

FV-901DM

external

VFO

provides

a

PLL-

synthesized

control

system

for

your

FT-901DM

station.

A

three-speed

scanner

will

take

you

anywhere

in

the

band

instantly,

and

the

auto-

scan

feature

will

sweep

the

band

until

it

finds

a

signal,

then

it

will

halt.

PLL

synthesis

in

100

Hz

steps

is

coupled

to

a

40-

frequency

memory

bank,

allowing

wide

versatility

for

contest,

DX,

or

net

operation.

The

TX/RX

clarifier

allows

offset

from

either

dial

or

memory

frequencies,

for

precise

tuning.

For

the

CW

operator,

the

use

of

the

FV-901DM,

along

with

the

FT-901DM

audio

peak

filter,

means

that

one

step

of

the

synthesizer

will

eliminate

a

signal

from

the

passband.

1-5

FTV-901R

VHF/UHF

TRANSVERTER

In

another

Yaesu

“‘first’,

the

FTV-901R

brings

three

bands

in

the

UHF

and

VHF

regions

together

in

one

compact

case.

The

basic

FTV-901R

comes

equipped

for

144—148

MHz,

and

the

6

meter

and

70

cm

modules

can

be

added

as

options.

The

satellite

1—3

bands

provide

operation

on

OSCAR

Modes

A/B/J,

on

full

duplex,

when

an

external

receiver

is

used.

Of

course,

the

FT-225RD

or

FT-221R

transceivers

can

also

be

used

for

transmission

on

the

OSCAR

145

MHz

uplink.

In

this

case,

your

FT

V-901R

can

be

used

for

instant

QSY

between

29

MHz,

145

MHz,

and

435

MHz.

Repeater

split

is

provided

on

50

and

144

MHz.

This

means

that

you

can

use

the

FM

capability

of

your

FT-901DM

to

full

advantage

on

these

bands.

Yaesu FT-901DM Manual

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