Sommerkamp Ft dx-500 User manual

С

FT

px-500

SSB

TRANSCEIVER

SOMMERKAMP

ELECTRONICS

GMBH

GERMANY

Downloaded

by

RadioAmateur.EU

GENERAL:

.

The

model

FT-DX-400/500

Single

Sideband

Transceiver

is

a

precision

built

high

performance

transceiver

providing

SSB

(USB

and

LSB

selectable),

CW,

and

AM

modes

of

operation.

This

transceiver

operates

at

a

maximum

input

оҒ

500

watts

РЕР

for

SSB,

440

watts

for

CW

and

125

watts

AM

on

all

bands,

80

through

10

meters.

Тһе

FT-DX-400/500

transceiver

18

capable

of

400

watts

PEP

input

under

steady

state

two-tone

test

conditions

before

flat-topping,

however

the

Peak

Envelope

Power,

when

voice

modulated,

is

more

than

500

watts.

The

transceiver

is

self-contained

in

that

it

requires

only

а

microphone,

a

speaker,

and

an

antenna.

A

specially

designed

high

frequency

crystal

lattice

filter

is

utilized

for

the

sideband

generation.

The

clarifier

is

provided

to

shift

the

receiver

frequency

approximately

5

Kc

either

side

of

the

transmitting

frequency.

Тһе

clarifier

may

be

switched

so

that

it

will

lock

the

receiver

frequency

to

the

transmitting

frequency.

It

may

also

be

used

for

vernier

tuning

of

the

main

dial.

Provisions

have

been

made

for

the

use

of

an

external

VFO

unit.

A

switch

on

the

front

panel

selects

the

transmitter

to

an

external

VFO

control

mode.

"This

feature

provides

the

operator

with

independent

transmitting

and

receiving

frequency

operation.

Moreover,

this

switch

can

also

select

four

crystals

for

crystal

control

operation.

In

addition

to

the

reception

of

normal

amateur

bands,

it

1s

possible

to

operate

3

extra

500

Kc

bands

as

|

provided

by

the

band

switch.

|

Other

features

include

a

built-in

voice

control

system,

100Kc/25Kc

multivibrator

calibrator

circuitry,

and

provision

has

been

made

for

using

our

linear

amplifier

FL-2000.

SPECIFICATIONS

Emission

type

225

ee

rient

era

qaaa

aue

Pe

Ley

жана

sesse

sns

SSB

(USB

and

LSB

selectable),

CW,

AM

Тараг

POWER

«atreve

bri

IPIE

Lipa

rias

на

тан

най

асо

500

watts

PEP

maximum,

125

watts

for

AM

440

watts

CW.

Frequency

range

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

a...

3.

5—4.0,

7.0—7.5,

14.

0—14.

5,

21.

0—21.

5,

28.

0—30.

0

Mc

|

(3

extra

bands

can

be

added).

Frequency

stability..............................................

After

warmup

100

cps

for

any

30

min.

Antenna

Impedance

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

...90

to

120

ohms

unbalanced

Carrier

suppression

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

КЕНГЕ

M

PT

More

than

—40

db

Sideband

suppression

———

E

—

ТО

More

than

—50

db

at

1000

cps

Distortion.

producta

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

a...

ka

po

neue

сөс

Better

than

—25

db

Receiver

sensitivity

...........

с

——

А

‚.б.5н\у'

S/N

20db

at

14

Mc

SSB

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by

RadioAmateur.EU

(1)

Ф$РЕСТЕ1ЇСАТЮХМ8

CONT

:

ааа

ОТСОН

da

банды

И

2.3

Kc

at

—6

db,

3.7

Kc

at

—55

db

Image

тетёспоп

Me

50

db

Audio

outpüt

э...й

Йа

анна

елена

а

ы

а

ақы

ақылына

1

watt

at

5%

distortion

Output

impedance

оао

ЫЕ

ded

Y

Ra

dida

ШЕ

4

and

600

ohms

Power

Теге

ейт

сабады

ы

i

FRI

ERRARE

SVO

ERN

aaka

EAE

IR

aE

аага

б.

AC

117

or

220

volts

at

50/60

cps

Dimensión:

алар

ы

ыы

аманы

ыш

ында

a

u

pu

utu

a

Moe

DUE

15

3/4”

wide,

6

1/4”

high,

13

3/4”

deep

Weight

сылы

олы

qu

ООЛО

КОКТУ

ЛЕУ

ана

approximately

(50

Ibs)

BLOCK

DIAGRAM

ANT

AGG

LINE

AGG

TXIsiMIX

5220-5720КС,

НЕСТ

S

NO

AMDET

AF

SSBDET

6BM8&(T)

6BMB(P)

резер,

|

12AU7

3.5MG

9,220KC

И,

sss

tz

sa

cud.

I

1

BUFF

Fix

CH

OSC

7

MC

12.720КС

!

LOCAL

OSC

14

МС

19,

720KC

|

5!

©

гі

МС

25.720КС

БВА6

C3!

6BA6

250372

АЕН

БЕ

28

МО

А3З3.720КС

—

EXT

VFO

|

І

!

|

h

t

1

š

z

3178.

акс

3181.6KC

А

F

FF

B34.220KC

П

RM

š

vFO

BU

C34.

T20K

C

D35.220KC

VFO

OSC

ACHANNEL

USB LSB

1

I

t

I

i

І

:

|

—

zu

E

280372

c

l

1

i2AU7

=

-

[

t

Т

І

}

1

!

|

Tx

290372

|

I

METER

|

2nd

(Б)

RX

S

r

6KD6

le

|

MIX

—

8400—

8900K

C

TX.

PO

ds

МІС

AMP

:

ic

Е

|

ALG

-...---

--

7360

pee

PS

Mio

|

p

L

6KD6

REALY

TUBE

VOX

AMP

|

[nex

мл,

KEY

ALC

LINE

[REALY

|

d

к

PRINCIPLES

ОЕ

ОРЕКАТІОМ

The

block

diagram

and

the

circuit

description

provides

you

with

а

better

understanding

of

this

transceiver.

The

transceiver

consists

of

a

double-conversion

receiver

and

a

double-conversion

exciter-transmitter.

Receiver

and

transmitter

circuits

use

common

oscillators,

common

crystal

filters,

and

common

IF

stages.

The

low

frequency

IF

is

3,

180

Ke,

and

high

frequency

IF

is

5,220

to

5,720

Кс.

The

high

frequency

IF

is

tunable

and

covers

500

Ke.

RECEIVER

CIRCUIT

;

A

signal

from

the

antenna

passes

through

the

antenna

relay

and

trap

coil

to

the

tuned

circuit

and

is

applied

to

the

grid

of

the

RF

amplifier,

VI,

6BZ6.

This

trap

circuit

minimizes

interference

caused

by

the

signals

in

the

first

IF

range.

Amplified

signals

from

V1

are

applied

from

the

tuned

circuit

consisting

of

C10

and

band

switch

selected

coils

to

the

grid

of

the

receiver

first

mixer

V201,

6CB6.

The

high

frequency

oscillator

injection

signal

is

also

fed

to

the

grid

of

the

first

mixer

from

the

local

oscillator

V2,

6BA6.

The

product

of

the

first

mixer

is

applied

from

the

plate

of

the

tube

to

the

variable

IF

transformer.

Output

of

this

transformer

(5,

220

to

5,

720

Kc)

is

applied

to

the

grid.

of

the

second

receiver

mixer,

V203,

GBE6.

When

the

signal

is

applied

to

the

grid

of

V203,

and

the

VFO

injection

signal

is

applied

to

another

grid

of

the

tube,

the

3,

180

Kc

difference

product

is

fed

from

the

V203

plate

to

the

crystal

filter.

The

output

(2).

mgp

from

the

filter

is

applied

to

the

grid

of

the

first

IF

amplifier,

V204

6BA6.

The

signal

is

amplified

by

V204

and

V205

and

applied

through

L205

to

the

AM

detector,

AVC

rectifier

diodes,

and

the

grid

of

product

detector

V213,

12AU7.

The

beat-frequency

oscillator

signal

which

is

delivered

from

V206,

12AU7

is

applied

to

the

cathode

of

V213,

and

the

result

is

the

detected

audio

signal.

Output

of

the

AVC

rectifier

circuit

is

applied

to

the

grid

circuit

of

RF

amplifier

tube

and

IF

amplifier

tube

to

control

the

gain

of

the

receiver

automatically

and

prevents

overloading.

Output

from

the

AM

detector

or

the

product

detector

is

applied

through

MODE

switch

to

the

noise

limiter

circuit

by

a

switch

in

front

panel.

Output

from

the

noise

limiter

circuit

is

applied

through

the

AF

GAIN

control,

VR9,

to

the

grid

of

the

first

AF

amplifier

tube,

triode

section

of

V210,

6BM8.

Amplified

audio

output

of

the

triode

section

is

coupled

to

the

grid

of

the

AF

output

amplifier,

pentode

section

of

V210,

of

which

the

plate

is

connected

to

the

output

transformer

ТЇ.

TRANSMITTER

CIRCUIT:

The

microphone

input

is

connected

to

the

grid

of

the

first

audio

amplifier

V208A,

12АХ7,

and

then

coupled

to

the

grid

of

the

second

audio

amplifier,

V208B,

the

other

half

of

the

tube.

Output

from

V208B

is

coupled

to

the

beam

deflection

electrode

of

V207,

7360,

through

the

MIC

GAIN

control,

VR-6.

In

the

TUNE

position

of

the

MODE

switch,

output

from

the

tone

oscillator,

V212,

6U8,

is

fed

to

the

grid

of

the

second

audio

amplifier.

This

signal

is

also

fed

to

the

grid

of

the

first

receiver

A-F

amplifier

tube,

V210,

through

the

AUDIO

GAIN

control.

The

carrier

signal

generated

in

V206,

12AU7,

is

fed

to

the

control

grid

of

V207.

Output

from

the

balanced

modulator

V207

coupled

to

the

grid

of

the

IF

amplifier,

V204,

6BA6,

through

the

crystal

filter,

XF-201

of

which

the

passband

is

centered

at

3,180

Kc.

This

passes

either

the

upper

or

lower

sideband,

depending

upon

the

sideband

selected

when

the

MODE

‘switch

is

set-to

carrier

crystal

X201

or

X202.

The

output

from

the

IF

amplifier

is

fed

through

L204

to

the

grid

of

transmitter

VFO

mixer,

V201,

6CB6.

The

plate

circuit

of

the

first

mixer

is

connected

to

the

tunable

IF

coil

L202,

and

converts

the

3,

180

Kc

sideband

signal

to

a

5,220

to

5,720

Kc

single

sideband

signal.

The

tunable

IF

network

is

so

designed

that

it

provides

excellent

spurious

reduction.

The

output

signal

from

the

tunable

IF

network

is

fed

to

the

grid

of

the

second

mixer,

УЗ,

6AH6,

and

the

high

frequency

injection

signal

from

crystal

oscillator,

V2,

6ВА6

is

also

fed

to

the

grid

of

V3.

This

arrangement

converts

the

IF

signal

to

the

desired

transmitting

frequency.

Output

from

the

second

mixer

is

fed

through

a

tuned

circuit

to

the

grid

of

the

driver

tube,

V4,

5763,

and

amplified

to

a

level

sufficient

to

drive

the

final

linear

amplifier,

V5

and

V6,

6KD6s.

Final

output

from

V5

and

V6

is

fed

to

а

pi-section

network

consisting

of

L15

and

PLATE

and

LOAD

capacitors.

А

section

of

the

bandswitch

adjusts

the

inductance

of

L15

to

the

correct

value

for

each

band,

and

adds

fixed

amounts

of

capacity

to

the

LOAD

capacitor

on

the

lower

bands.

Output

from

the

pi-network

1s

fed

to

the

antenna

through

contacts

of

the

transmit

and

receive

relay,

Both

the

driver

and

final

stages

аге

neutralized

to

ensure

stability.

А

section

of

the

band

switch

selects

the

capacitors

to

the

correct

value

for

perfect

neutralization

on

each

band.

The

ALC

circuit

is

placed

in

the

grid

circuit

of

the

final

tubes.

When

RF

driving

voltage

to

the

final

tubes

becomes

sufficient

to

drive

the

grids

positive,

the

grids

begin

to

draw

current

and

the

signal

is

detected.

This

produces

an

audio

envelope.

The

audio

is

rectified

by

the

ALC

rectifier,

which

in

turn

produces

a

negative

DC

voltage.

The

voltage

is

filtered

by

C61,

C62,

R29

and

R30,

which

also

determines

the

time

constant,

and

is

used

to

control

the

gain

of

V204.

The

ALC

voltage

is

grounded

by

the

mode

switch

on

CW

and

TUNE

positions.

This

system

allows

a

high

average

level

of

modulation

without

increased

distortion.

(3)

Wu

T4

:

4

Audio

output

voltage

from

the

second

microphone

amplifier,

V208,

is

coupled

through

the

VOX

GAIN

control

to

the

grid

of

V209A,

12AU7,

and

fed

to

the

VOX

rectifier.

The

positive

DC

output

voltage

of

the

VOX

rectifier

is

applied

to

the

grid

of

VOX

relay

amplifier

tube,

V209B,

12AU7,

causing

it

to

conduct

current

and

actuate

the

VOX

relay

RL1.

The

relay

tube

is

so

biased

that

the

relay

is

actuated

by

the

FUNCTION

switch

in

the

MOX

position.

Contacts

on

the

relay

switch,

—

100

volts

DC

muting

and

bias

voltage,

the

metering

circuit

from

receive

to

transmit,

the

clarifier

circuit,

and

a

of

the

remote

socket

to

the

ground

on

transmit.

Plate

current

of

V4

and

V1

actuates

the

antenna

relay

RL2.

The

antenna

relay

also

operates

the

FUNCTION

switch

in

the

CAL

position

to

disable

the

receiver

RF

amplifier

tube

for

easy

and

clear

calibration.

The

ANTITRIP

circuit

provides

a

threshold

voltage

to

prevent

the

loud

speaker

output

from

tripping

the

transceiver

into

the

transmit

function.

The

receiver

output

audio

voltage

is

connected

through

ANTITRIP

control,

VR8,

to

a

rectifier.

Negative

DC

output

voltage

from

the

ANTITRIP

rectifier,

connected

to

the

grid

of

the

VOX

tube

V209B,

12AU7,

provides

the

necessary

antitrip

threshold.

ANTITRIP

control

VR8

adjusts

the

value

of

the

antitrip

voltage

threshold

so

that

the

loudspeaker

output

will

not

produce

too

much

positive

DC

output

from

the

VOX

rectifier

so

as

to

exceed

the

negative

DC

output

from

the

antitrip

rectifier

and

cause

V209B

to

actuate

the

relay.

However,

the

microphone

input

will

cause

the

positive

voltage

to

overcome

the

negative

voltage

and

actuate

the

relay.

Relay

hold

time

will

be

determined

by

DELAY

control

under

top

cover.

OSCILLATORS

The

transceiver

contains

six

oscilators.

They

are

the

carrier

oscillators,

two

high

frequency

crystal

oscillators,

the

variable

frequency

oscillators,

the

tone

oscillator,

and

the

crystal

calibrator.

Carrier

oscillator

The

carrier

oscillator

is

crystal

controlled

at

either

3,178.

4

or

3,

181.5

Kc,

depending

upon

whether

V201

or

V202

is

selected

by

the

MODE

switch.

The

mode

switch

disconnects

the

cathode

circuit

of

either

tube

when

not

in

use.

These

crystal

frequencies

are

matched

to

the

pass

band

of

the

crystal

filter,

so

that

the

carrier

frequency

is

placed

approximately

20

db

down

on

the

skirt

of

the

filter

respons».

The

3,181.

5

Kc

crystal

fre-

quency

is

shifted

into

the

filter

response

range

to

insert

the

carrier

on

AM

and

CW

position

of

MODE

switch.

High

frequency

oscillators

One

of

the

high

frequency

oscillators

is

used

instead

of

the

variable

frequency

oscillator

for

crystal

controlled

operation.

А

silicon

transistor,

TR

701,

25C

372,

is

used

for

the

crystal

controlled

oscillator,

and

its

output

is

fed

to

the

VFO

buffer,

V211,

6BA6,

through

the

SELECT

switch.

The

relation

between

the

operating

frequency

and

the

crystal

frequency

is

shown

on

the

table,

page

15.

The

other

is

used

to

set

the

desired

band.

This

oscillator,

V2,

6BA6,

is

crystal

controlled

by

ome

of

8

crystals

selected

by

the

BAND

switch.

Output

from

the

oscillator

is

fed

to

the

cathode

of

the

receiver

first

mixer

V202,

6CB6,

and

the

grid

of

the

transmitter

second

mixer,

УЗ,

6АН6.

The

output

frequency

of

this

oscillator

is

always

5,720

Kc

higher

than

the

lower

edge

of

the

selected

band.

The

output

signal

from

this

oscillator

is

the

crystal

fundamental

frequency

for

80

and

40

meter,

but

for

higher

bands,

the

crystal

frequency

is

trippled

in

the

plate

circuit

of

the

oscillator.

Variable

frequency

oscillator

The

VFO

uses

a

silicon

transistor,

TR401,

25С372,

as

the

oscillator,

and

TR402,

2SC372

as

the

buffer.

The

oscillating

frequency

is

8,

400

to

8,900

Kc,

and

the

variable

capacitor

is

ganged

to

the

tunable

IF

stage.

Varactor

diode

IS145

is

in

series

with

capacitor,

C402,

and

is

switched

into

the

circuit

by

the

CLARIFIER

select

switch

and

relay

contacts

to

shift

the

VFO

frequency.

Output

from

ТЕ402

is

fed

through

the

SELECT

switch

to

(4)

Downloaded

by

{рО

buffer

tube

V211.

:

RadioAmateur.EU

Tone

oscillator

The

tone

oscillator

operates

when

the

MODE

switch

is

in

CW

or

TUNE

position.

It

is

a

phase

shift

oscillator

operating

at

approximately

8000

срз.

The

output

is

fed

to

the

transmitter

audio

circuit

for

tuneup

of

the

transmitter.

Some

of

the

output

from

the

tone

oscillator

is

applied

to

the

receiver

audio

amplifier

for

sidetone

monitoring

in

CW

operation.

Crystal

calibrator

The

100

Kc

crystal

oscillator,

TR301,

28C367

is

used

for

dial

calibration.

Output

from

the

buffer

transistor,

TR302

is

fed

into

the

25

Kc

multivibrator

which

generates

a

marker

signal

at

every

25

Kc.

POWER

SUPPLY

The

built-in

power

supply

is

an

all

solid

state

bridge-type,

delivering

4

different

DC

voltages

and

also

AC

heater

supply

for

all

tubes.

The

power

transformer

has

two

primary

windings

for

operation

from

either

117

or

220

volt

AC

supply.

The

power

amplifier

plate

voltage

(800

V

DC)

is

supplied

from

bridge

connected

silicon

rectifiers.

300

volts

DC

is

delivered

to

the

plates

of

the

other

tubes,

and

150

volt

DC

supply

is

provided

through

the

center

tap

of

the

medium

voltage

supply.

Bias

is

supplied

from

a

half

wave

rectifier,

D513,

SH-1.

The

plate

voltage

for

all

oscillator

tubes

is

regulated

with

a

VR-105

MT,

stabilizer

tube.

METER

CIRCUIT

The

same

meter

is

used

for

both

transmit

and

receive.

In

the

RECEIVE

position

it

functions

as

an

5

meter.

In

the

TRANSMIT

position

by

selection

it

will

indicate

total

cathode

current

of

the

PA

stage,

A.L.C.,

or

may

be

used

to

show

relative

power

output.

INSTALLATION

It

is

recommended

that

an

excessively

warm

location

be

avoided.

The

transceiver

should

be

placed

in

a

location

that

has

adequate

space

so as

to

permit

free

air

circulation

through

the

cabinet

openings.

Check

the

primary

input

voltage

of

the

transceiver

before

connecting

to

the

power

outlet.

The

peak

power

consumption

is

approximately

600

watts.

The

transceiver

should

be

connected

to

a

good

ground

by

a

heavy

lead

to

the

terminal

marked

GND

on

rear

apron

of

the

chassis.

И

is

not

recommended

that

a

gas

pipe

or

electrical

conduit

pipes

be

used.

The

ground

lead

should

be

as

short

as

possible.

Impedance

of

the

antenna

is

designed

to

match

a

50

to

120

ohm

load.

Most

commercial

antenna

and

feeders

are

designed

between

50

and

75

ohms.

If

the

impedance

is

far

from

this

value,

an

antenna

matching

device

should

be

placed

between

the

antenna

terminal

and

the

feeder.

(S)

(5

A

(

гелі!

—

|

{се

|

De

'

"d

ACA

im

=)

uy

E

=,

[

Di

E

Y

SELECT

FUNCTION

)

MODE

|

RF

GAIN

AF

GAIN

т)

MAIN

TUNING

BAND

CLARIFIER

METER

MIC

GAIN

AGC

PRESELECT

PLATE

LOADING

INT:

Operating

frequency

is

determined

by

main

tuning

dial.

EXT:

Receiver

frequency

is

determined

by

the

main

dial,

and

transmitter

frequency

by

an

external

ҰТО.

СП-1

to

CII-1:

Crystal

controlled

operation.

ОРТ:

Linc

voltage

to

transceiver

18

off.

STBY:

All

voltages

are

applied

to

transceiver.

CAL

100

KC:

100

Ke

calibrator

is

on.

CAL

25

KC:

25

Ke

multivibrator

is

on.

МОХ:

АП

circuits

for

transmit

are

energized,

PTT:

Ready

to

transmit

with

PTT

switch

on

the

microphone.

VOX:

Ready

to

transmit

for

voice

operation.

USB;LSD:

Side

band

operation,

TUNE:

Use

for

transmitter

tune-up.

CW:

Code

operation,

w

АМ:

Carrier

and

one

sideband

operation,

Contrals

the

gain

oí

RF

and

IF

stages.

Varies

the

gain

of

receiver

audio

amplifier,

and

automatic

noise

limiter

is

disconnected

at

pull

position.

Determines

operating

frequency.

Selects

the

coils

for

desired

band

operation.

Varies

the

УГО

frequency

slightly

for

receiver

incremental

tuning,

and

is

also

used

as

the

vernier

of

main

dial.

Selects

the

meter

to

read

PA

cathode

current,

relative

power

output

or

plate

current

of

ALC

controlled

stage.

Controls

microphone

gain

for

transmitter,

and

tone

signal

input

for

tune-up.

Changes

receiver

AGC

release

lime

constants.

Preselector

for

receiver

and

also

tuning

of

driver

stages

for

transmitter.

Tunes

the

plate

circuit

of

PA

tubes.

Tunes

the

output

circuit

of

PI

network.

(6)

OPERATION

INITIAL

CHECK

Prior

to

connecting

the

transceiver

to

power

outlet,

carefully

examine

Юг

any

visable

damage,

check

that

all

tubes

and

crystals

are

properly

seated

in

their

sockets,

and

check

tuning

controls

and

switches

for

complete

freedom

of

action.

Connect

the

speaker

cable

to

socket

marked

SP

on

rear

apron

of

the

chassis,

and

an

antenna

cable

to

the

coaxial

cable

connector.

Make

sure

that

supply

voltage

is

the

same

as

the

voltage

marked

on

the

rear

apron

of

the

chassis

before

connecting

to

power

outlet.

Set

FUNCTION

switch

to

OFF.

Set

MIC

GAIN

control

fully

counterclockwise.

Set

the

FUNCTION

switch

to

STBY.

The

transceiver

is

now

in

the

receive

condition

during

the

warmup,

and

the

S-meter

will

slowly

come

up

to

full

scale.

METER

ADJUST

Turn

meter

switch

to

the

ALC

position,

and

thes

adjust

ALC

control

until

meter

reading

shows

exactly

full

scale.

S-meter

adjustment:

Disconnect

antenna.

Adjust

S-meter

control

under

top

cover

until

meter

reads

exactly

full

scale.

Reconnect

antenna

for

normal

operation.

BIAS

ADJUST

|

After

warmup,

set

MODE

switch

to

USB,

METER

to

IC,

and

the

FUNCTION

switch

to

МОХ

for

transmit

condition.

The

meter

will

indicate

PA

plate

current.

It

should

be

approximately

50

ma.

If

plate

current

is

other

than

50

ma,

adjust

BIAS

potentiometer

under

top

cover.

RECEIVER

TUNING

Set

the

controls

as

follows:

FUNCTION

STBY

MODE

->

Desired

operation

mode

BAND

Desired

band

MIC

GAIN

Fully

counterclockwise

RF

GAIN

Fully

clockwise

SELECT

INT

CLARIFIER

OFF

AGC

FAST

Adjust

the

AF

GAIN

control

until

some

receiver

noise

is

heard

in

speaker.

Peak

the

PRESELECTOR

for

maximum

S-meter

reading.

For

calibration,

turn

the

FUNCTION

switch

to

CAL

100.Кс

position’

Rotate

the

dial

to

nearest

100

Ke

point

and

carefully

adjust

tuning

for

zero

beat.

Holding

the

outer

tuning

knob

tightly,

rotate

the

subdial

(skirt)

to

the

zero

mark.

The

red

scale

on

the

main

dial

corresponds

to

the

band

marked

іп

red

оп

the

BAND

switch

and

starts

from

500

Кс.

For

example,

if

the

hairline

is

at

500

red

on

the

10B

band,

the

receiving

frequency

is

28,500

Ke.

FUNCTION

switch

at

CAL

25

Kc,

marker

signal

is

heard

every

25

Кс.

For

SSB

or

CW

operation,

the

AGC

switch

is

usually

set

to

SLOW.

(7)

1

SELECT

INTERNAL,

"de

а

одоно

ғ

POSITIONS

|

FUNCTION

STBY

`

BAND

ue

жаа

meo

MODE

<>.

|

УА

TUNE.

x

A

MN

ТЕК

Lo)

1

MIC

GAIN

Fully

counter

clockwise

77.

“АО

ен

ee

y

и

5.

АЕ

GAIN

Normal

listening

level

Bnri

uun

“

METER

IC

Position

а

CLARIFIER

OFF

o

1ОВ....

кла

ск

бе

кета

оғада

а

n

e

BAND

Desired

band

а.

PLATE

Desired

band

К

A

LU

н

8

бы

LOADING

To

position

shown

in

table

|.

о

E

m

47

ы

м

eph

PROCEDURE

TRANSMITTER

TUNING

Set

controls

as

follows:

Se,

ME

1

Adjust

PRESEL

for

maximum

receiver

noise

level.

2.

Tum

FUNCTION

switch

to

MOX

position

with

meter

in

IC

position.

3.

Rotate

MIC

GAIN

control

until

meter

rises

just

above

normal

idling

current.

(50MA)

4.

Rotate

PRESEL

control

for

maximum

meter

reading.

(Caution:

if

meter

reading

exceeds

0.2

reduce

MIC

GAIN

control)

Rotate

PLATE

control

for

minmum

meter

reading.

(Dip

plate).

6.

Retum

FUNCTION

switch

to

STBY.

The

transmitter

is

now

pre-tuned

to

the

desired

frequency.

Final

peak

tuning

is

accomplished

by

carefully

л

following

the

final

tuning

procedure.

FINAL

TUNING

CAUTION

EXCEEDING

THE

TIME

LIMITS

NOTED

DURING

FINAL

TUNING

WILL

RESULT

INDESTRUC-

TION

OF

THE

FINAL

OUTPUT

TUBES.

1

Set

meter

to

P.O.

position,

FUNCTION

switch

to

STBY,

MODE

switch

to

CW.

2.

Momentarily

set

FUNCTION

switch

to

MOX

(10

seconds

maximum),

adjust

PRESEL

for

maximum

meter

reading.

Retun

FUNCTION

switch

to

STBY.

3.

Momentarily

set

FUNCTION

switch

to

МОХ

(10

seconds

maximum),

increase

or

decrease

LOADING

slightly

for

maximum

meter

reading.

Return

FUNCTION

switch

to

STBY.

4.

Momentarily

set

FUNCTION

switch

to

МОХ

(10

second

maximum),

adjust

PLATE

for

maximum

meter

reading.

Return

FUNCTION

switch

to

STBY.

5.

Repeat

steps

Запі

4

until

maximum

meter

reading

is

obtained.

‘The

transmitter

is

now

peaked

to

maximum

output.

Return

meter

to

IC

position

and

set

MODE

switch

to

desired

operating

position.

SSB

OPERATION

NOTE:

Key

jack

must

be

removed

from

transmitter

when

operating

in

the

side

band

ог

AM

mode.

Set

up

the

transceiver

operation

as

previously

described.

Set

the

METER

switch

to

ALC

position.

Set

the

FUNCTION

switch

to

MOX

and

adjust

the

MIC

GAIN

control

until

the

meter

kicks

up

to

midscale

of

green

colored

portion

speaking

into

the

microphone

normally.

Set

the

FUNCTION

switch

to

desired

operation,

MOX

(manual),

PTT

(push-to-talk),

or

VOX

(voice

control).

For

VOX

operation,

set

the

FUNCTION

switch

to

VOX

position.

and

advance

VOX

GAIN

control

under

top

cover

until

voice

actuates

the

transceiver,

If

the

VOX

relay

actuates

with

the

output

from

the

speaker,

increase

the

ANTITRIP

control

to

the

minimum

point

to

prevent

the

speaker

output

is

tripping

the

VOX.

Do

not

use

more

VOX

gain

or

more

ANTITRIP

gain

than

necessary.

Adjust

the

DELAY

control

under

top

cover

for

suitable

release

time

constant.

(8)

PENEI

OT

RENE

ERARA

Res

ДАЛ

_

NOTE.

~The

meter

can

not

follow

speech

speed,

so

the

reading

will

show

only

around

250

ma

for

normal

speech

conditions,

however,

peak

current

is

approximately

2

times

the

meter

reading.

CW

OPERATION

Using

the

two

contact

jack

supplied

with

the

accessory

pack,

connect

key

as

shown

in

illustration

on

page

12.

Most

relay

type

automatic

keyers

can

be

connected

into

the

FT

sx

400

for

break-in

operation

without

modifica

-

cation.

SIDETONE

ADJUSTMENT

CW

sidetone

level

may

be

adjusted

by

rotating

the

tone

level

potentiometer

located

on

the

main

circuit

board

under

the

top

cover.

NOTE:

Ро

пої

disturb

setting

of

adjacent

paint

marked

controls.

NOTE:

Insertion

of

key

jack

automatically

disconnects

bias

supply

to

final

output

tubes,

therefore,

with

key

jack

‘installed

bias

idlying

current

will

not

be

indicated

on

meter.

AM

OPERATION

NOTE:

Key

jack

must

be

removed

from

transmitter

when

operating

in

the

side

band

or

AM

mode.

Set

up

the

transceiver

as

described

in

transmitter

tuning.

Set

meter

to

IC,

MODE

switch

to

AM

position

Momentarily

set

FUNCTION

switch

to

MOX.

Meter

should

read

150

ma.

If

meter

indicates

other

than

150

ma

adjust

the

AM

control

under

top

cover

until

the

correct

reading

is

obtained.

Adjust

the

MIC

GAIN

control

until

the

meter

reading

kicks

slightly

on

speech

peaks.

Do

not

draw

more

than

150 ma,

otherwise

the

PA

tube

will

be

damaged

immediately.

TUNING

PROCEDURE-CW

Set

up

transceiver

as

described

in

transmitter

tuning.

After

completion

of

final

tuning,

install

key

jack

in

rear

apron

of

transceiver.

Set

MODE

switch

to

CW

and

FUNCTION

switch

to

MOX.

The

transceiver

is

now

set

up

for

manual

CW

operation.

After

completing

a

transmission

the

FUNCTION

switch

must

be

returned

to

STBY

position

for

receive

operation.

For

break-in

operation,

simply

set

FUNCTION

switch

to

VOX

position

for

trans-

mit

and.

receive.

SERVICE

INSTRUCTIONS

WARNING

Dangerous

voltages

are

present,

therefore

extreme

care

is

essential.

Be

sure

that

all

power

is

disconnected

before

working

in

the

chassis.

Check

the

high

voltages

in

the

capacitors

by

shorting

the

high

voltage

line

to

ground

with

an

insulated

screw

driver.

The

transceiver

has

been

aligned

and

calibrated

at

the

factory

with

proper

test

instruments

and

should

not

require

realignment.

Service

or

replacement

of

a

major

components

may

require

subsequent

realignment,

but

do

not

attempt

to

make

any

alignment

unless

the

operation

of

the

transceiver

is

fully

understood.

To

remove

the

transceiver

chassis

from

the

cabinet,

remove

the

six

screws

around

the

cabinet

and

two

screws

on

the

bottom

of

the

cabinet.

From

the

rear,

push

the

chassis

forward

until

front

frame

slides

out

of

the

cabinet.

Holding

the

front

panel

at

the

edge,

carefully

slide

the

chassis

out

of

the

cabinet.

VOLTAGE

AND

RESISTANCE

MEASUREMENTS

The

table

lists

voltages

and

resistances

at

all

tube

sockets.

These

values

are

measured

with

a

УТУМ

with

all

tubes

installed

in

their

respective

sockets.

All

measurements

should

be

made

from

socket

pins

to

ground.

Adjust

transistor

voltage

stabilizer

to

exactly

9

volts

with

VR-202

on

the

printed

board.

>

TEST

EQUIPMENT

REQUIRED

A

signal.

generator,

a

vacuum

tube

volt

ohm

meter

with

RF

probe,

a

general

coverage

communication

receiver,

and

a

500

watt

dummy

load.

(9)

TRANSMITTER

ALIGNMENT

1)

2)

3)

4)

5)

6)

7)

8)

9)

10)

11)

12)

13)

14)

15)

16)

Disconnect

the

high

voltage

(860

volts)

by

unsoldering

the

lead

at

rectifier

socket,

and

also

the

screen

voltage

by

unsoldering

the

connection

at

3

of

the

two

tube

sockets.

Connect

УТУМ

RF

probe

to

5

of

V5.

Set

the

MODE

switch

to

USB

or

LSB,

and

the

FUNCTION

switch

to

MOX

position.

Adjust

carrier

balance

potentiomenter

VR,

201

on

the

main

print

board

for

minimum

VTVM

indication.

Advance

MIC

GAIN

control

two

positions,

and

turn

the

MODE

switch

to

TUNE.

Adjust

PRESELE

control

for

maximum

VTVM

reading.

=

Adjust

the

MIC

GAIN

control

during

transmitter

alignment

to

keep

VTVM

reading

at

15

volts

to

avoid

saturation

of

the

circuits.

Start

with

both

slugs

of

1.203

nearly

out

and

peak

primary

and

secondary

of

L203

for

peak

VT VM

reading.

Same

as

in

7,

adjust

slugs

of

L204.

Set

main

tuning

dial

to

center

ie.

250

Kc,

and

adjust

top

slug

of

L202

for

peak

VTVM

reading.

Set

the

main

tuning

dial

to

upper

end

(500

Кс),

and

adjust

bottom

slug

for

peak

VTVM

reading.

Repeat

this

procedure

two

or

three

times.

Set

the

BAND

switch

to

the

80

meter

band,

the

main

tuning

dial

to

the

center

(250

Кс),

and

the

PRESELE

control

at

center.

Adjust

the

slugs

of

L901

&

1.1001

for

peak

УТУМ

reading.

Adjust

the

slugs

on

all

appropriate

bands

from

40

to

15

meters

using

the

same

procedure.

Set

the

BAND

switch

to

10B

and

the

main

tuning

фа!

at

upper

edge,

and

adjust

1.905

and

1,1005

for

peak

VTVM

readings.

Disconnect

the

УТУМ

from

5

of

V5,

and

connect

it

to

2

of

V202.

Set

the

BAND

switch

to

10D and

adjust

slug

of

L3

for

peak

VTVM

reading.

Set

the

BAND

switch

to

10C

and

adjust

TC1101

for

peak

VTVM

reading.

Adjust

TC1102

for

10B,

TC1103

for

10^,

TC1104

for

15

and

TC1105

for

the

20

meter

band,

for

peak

УТУМ

reading.

For

the

40

meter

band,

adjust

L4

for

peak

VTVM

reading.

For

the

80

meter

band,

adjust

ТС-1106

for

peak

VIVM

reading.

Disconnect

VT

VM.

Connect

VTVM

RF

probe

from

1

of

V203

to

ground.

Set

the

main

tuning

dial

at

center.

Adjust

L207

for

peak

VTVM

reading.

Disconnect

VTVM

from

1

of

V203

socket.

Turn

the

FUNCTION

switch

to

OFF.

Restore

unsoldered

PA

screen

grid

and

high

voltage

wire.

Connect

the

transceiver

output

to

a

50

or

75

ohms

dummy

load.

Set

the

main

tuning

dial

at

center,

and

tuneup

the

transceiver

on

80

meter

band

as

described.

Adjust

MIC

GAIN

control

setting

to

keep

PA

current

less

than

100

та.

Readjust

1.1001

for

peak

meter

reading.

Readjust

1.1001

to

L1005

for

appropriate

BAND

settings.

Tune

the

transceiver

to

maximum

output

on

any

band,

then

turn

MODE

switch

to

LSB

or

USB.

Discon-

nect

dummy

load

from

output.

IC

shows

idle

current

approximately

50

ma.

Rotate

PLATE

control,

LOADING

control,

and

PRESELE

control

through

range.

Proper

neutralization

is

indicated

when

по.

change

of

meter

reading

is

observed.

If

it

is

not

so,

the

adjustment

of

TC1

is

required.

The

n»utralizing

capacitor

ТСІ

must

be

adjusted

in

small

increments

on

an

adjust

and

try

basis.

The

driver

stage

is

neutralized

by

a

small

capacitor

made

by

twist

two

wires.

Tune

the

transceiver

to

maximum

output

at

14,180

Кс.

To

measure

spurious

radiation,

use

(һе

S-meter

of

other

receiver

and

tune

it

to

14,220

Кс

where

a

spurious

radiation

can

be

heard.

Adjust

Tc-203

for

minimum

S-meter

reading

without

decreasing

power

output

of

the

transceiver.

Adjust

TL-401

for

minimum

S-meter

reading.

(10)

RECEIVER

CIRCUIT

ALIGNMENT

If

the

transmitter

circuits

are

aligned

first,

the

most

alignments

will

be

completed

for

the

receiver.

The

only

alignment

remaining

for

the

receiver

circuits

are

the

last

IF

stage

transformer

L205,

antenna

input

transformer

L801

to

L805,

trap

coils

L806

and

L906,

and

S

meter

zero

set.

1)

Connect

signal

generator

output

to

the

antenna

terminal.

Set

the

BAND

switch

to

80

meters,

and

receive

3,750

Ke

signal

from

signal

generator.

Adjust

PRESELE

control

for

peak

S

meter

reading.

Adjust

L801

for

peak

S

meter

reading.

Adjust

coils

L802

to

L805

at

7,250,

14,

250,

21,

250,

29,

000

Kc

respectively

for

peak

S

meter

reading.

2)

Tune

the

receiver

circuit

to

7,

500

Kc

incoming

signal,

and

leave

controls

as

is.

Apply

5,700

Kc

signal

generator

output

to

antenna

terminal

Adjust

L806

and

L906

for

minimum

S-meter

reading.

3)

Tune

the

receiver

to

incoming

signal

at

any

band,

and

adjust

slugs

of

L205

for

peak

S-meter

reading.

4)

Disconnect

signal

generator

from

antenna

terminal,

and

set

the

RF

GAIN

control

to

fully

clock

wise.

Adjust

S-meter

zero

set

under

the

top

cover

until

the

S-meter

indicates

full

scale,

i.

e.

S

zero.

TRANSMITTER

SIGNAL

LEVEL

The

follwing

table

shows

the

measuring

points

and

normal

signal

levels.

Before

making

measurements,

set

MODE

switch

to

CW

and

unsolder

the

lead

from

3

of

V5,

and

V6

sockets.

Set

the

FUNCTION

switch

to

MOX.

Plug-in

key

to

key-Jack

and

close

key

to

measure

the

signal

level.

TEST

POINT

FREQUENCY

VOLTAGE

V207

—

3

3,178.4

Kc.

1

volt

V201—

œ

1

Variable

0.6

volts

Function

sw.

STBY

УЗ

—

r

1

X-tal

frequency

selected

0.5

—

1

volts

"

V207

—

7

3,178.4

Kc.

5.5

volts

V204

—

”

1

я

0,03

volts

V204

—

»

5

,

5.5

volts

\201

—

,

5

Variable

IF

9.0

volts

ҰЗ

--»

5

Transmit

frequency

10.0

volts

V5

—

„5

,

33.0

volts

Voltages

given

in

the

table

are

nominal

and

may

vary

4-204.

RECEIVER

SIGNAL

LEVEL

The

following

table

shows

test

points

and

nominal

signal

level

to

produce

S-9

reading

on

S

meter.

Downloaded

by

RadioAmateur.EU

(11)

SIGNAL

GENERATOR

SIGNAL

GENERATOR

SIGNAL

GENERATOR

CONNECTION

POINT

FREQUENCY

OUTPUT

LEVEL

V205

—

ріп

1

3,180

Kc

100

db

V204

—

„

”

75

db

V203

—

»

7

5,70

Kc

77

db

ү01

=,

`

,

50

аЬ

VE

du

d

|

14,255

Kc

47

db

Antenna

terminal

> 2 |

"

34

db

Ocsillator

injection

voltages

V213

—

r

7

Е:

3,178.4

4

volts

№203

—

»

1

;

Variable

3

>»

V202

—

»

1.

|

Crystal

selected

1—2

volts

The

receiver

was

tuned

to

14.255

Кс

for

these

measurements

and

the

test

signal

injected

at

indicated

test

points.

Signal

generator

output

levels

are

taken

from

signal

generator

attenuator.

АП

values

are

nominal

апа

тау

vary

+20%

without

degrading

performance.

connection..

..

ws

E

|

bod

.

ыза

-

е

4:

ие

£

d

o£)

RUNE

T

V

d

E

c

EM

Sd

Doe-

a4

Ground

lead

for

microphone

should

be

wired

separately

and

connected

together

to

the

ground

lead

of

PTT

switch

at

plug

terminal.

(12)

ОЕЕЕСТ

TROUBLE

SHOOTING

GUIDE

POSSIBLE

CAUSE

PA

idling

current

unstable:

Insufficient

load:

Insufficient

carrier

suppression:

Distorted

transmitted

signal:

Insufficient

drive

or

no

drive:

Low

receiver

sensitivity:

VOX

unstable:

з

л

@

N

=

ы

оғ,

e

ON

қ-ғ.

M

Defective

V5

and

V6.

Defective

Bias

supply

including

bias

potentiometer.

PRESELE

improperly

tuned.

.

BAND.

switch

improperly

set.

Antenna

not

resonant

at

frequency.

Defective

antenna

or

transmission

line.

V3,

V4,

V5,

V6

defective.

Defective

rectifier.

Defective

V207.

Carrier

balance

control

improperly

set.

Defective

crystal

X201

or

X202.

Carrier

frequency

improperly

set.

Excessive

MIC

GAIN

adjust.

_

V7

defective.

D2,

D3

defective.

Incorrect

neutralization.

Defective

rectifier.

Defective

V204, V201,

V3,

V4,

V5.

Defective

crystal.

Antenna

relay

back

contacts

defective.

Defective

V1,

V201,

V203,

V204,

V205

Defective

V209

Improper

setting

of

VOX

GAIN

&

ANTITRIP

controls.

Downloaded

by

RadioAmateur.EU

(13)

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FREQUENCY

TABLE

(Ke)

арго

Plt?

VFO

Frequency

8800

8700

8508

8500 8400

Local

Frequency

3500 3600 3700

3800 3900

4000

7000

7100

7200

7300

7400

7500

14000

14100

14200 14300

14400

14500

21000

21100

21200

21300

21400

21500

28000

28100

28200

28300

28400

28500

28600

28700

28800

28900

29000

29100

29200

29300

29400

29500

Operating

Frequency

29500

29600

29700

29800

29900

30000

*

Operating

frequency=Carrier

frequency+1.5Ke

for

LSB

Carrier

frequency

—1.5

Kc

for

CW,

USB

&

АМ

Xtal

frequency

for

crystal

controlled

operation

is

determined

by

following

formula;

X=Local

frequency

—Operating

frequency

+3180

Kc

(15)

ТОМЕ

Cw

LSB

XTAL

SOCKET

USB

AUX

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TC1107

TC40i

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Sommerkamp FT DX-500 User manual

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