Yaesu FT-560 Manual de usuario

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INSTRUCTION

MANUAL

YAESU

MUSEN

CO.,

LTD.

TOKYO

JAPAN

SPECIFICATIONS

ИННИИ

еее

и.

SSB

(USB

апа

LSB

selectable)

CW

nn

560

watts

PEP

maximum,

500

watts

CW

AO

1...

e.

oe

e

ns

3.5-4.0,

7.0-7.5,

14.0-14.5,

21.0-21.5,

28.0-30.0

MHz

10.0—10.5(RX

only)

(2

extra

bands

can

be

added)

РАР

AN

After

warmup

100

Hz

for

any

30

min.

СЕ

Се............;.

m

RR

Rm

RR

R

RR

MIL

50

to

120

ohms

unbalanced

Carrier

озеп

A

A

Ap

ТТЫ

Ыр;

Better

than

-40

db

ION...

Better

than

-50

db

at

1000

Hz

RSS

ANS

NR

Better

than

-25

db

EN

....

...

..

..

....

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

O.5,

V

S/N

20db

at

14

MHz

SSB

EM

uus

"i.

2.4

KHz

at

—6db,

4.2

KHz

at

—

60

db

REM

eee

600Hz

at

—6db,

1.2

KHz

at

--60

db

ЕЕ

A

Со...

id

соо.

ины

ИЛЫ

АЙ

50 db

MEE

S

M

Е

о

о,

yy

1

watt

EE

7

7

eee)

yg

E

EE

RR ER

ш...

8

ohms

Иепе

..

..

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

АС

117

or

220

volts

at

50/60

Hz

ee

.........:...............

1534”

wide,

64”

high,

1334”

deep

EE

A

ds

ea

RII

approximately

(40

Ibs.)

x

Option

CONGRATULATIONS!

You

have

just

purchased

one

of

the

finest,

high

performance

transceivers

available

to

the

amateur

today.

To

fully

appreciate

the

features,

flexibility,

and

efficient

operating

procedures

available

with

your

new

transceiver,

we

recommend

that

the

in-

struction

manual

be

studied

thoroughly

prior

to

operation.

GENERAL:

The

FTdx560

Single

Sideband

Transceiver

is

a

pre-

cision

built

transceiver

providing

SSB

(USB

and

LSB),

and

CW

modes

of

operation.

This

transceiver

operates

at

a

maximum

input

of

(560)

watts

PEP

for

SSB,

and

(500)

watts

CW

on

all

bands,

80

through

10

meters.

In

addition

to

the

high

output

power

of

the

trans-

ceiver,

many

features

that

have:

previously

been

consid-

ered

extra

cost

options

are

included

as

standard

equip-

100/25KHz

ment

on

the

FTdx560

Standard

equipment

includes

built-in

solid

state

power

supply,

noise

blanker,

fully

adjustable

VOX,

break-in

СУУ

operation,

adjustable

CW

side

tone,

clarifier

control

provides

+

5

KHz

off-set

receiver

operation,

dual

calibration

markers

at

100

and

25

KHz,

10

MHz

WWV

Band,

provision

for

two

additional

transceive

bands

outside

the

amateur

bands

between

3.5

and

30

MHz,

and

front

panel

external

VFO

switching.

ЕУ401

External

VFO

The

companion

FV401

External

VFO

allows

cross-

band

DX

operation

and

has

the

effect

of

providing

the

operator

with

split

frequency,

separate

receiver-trans-

mitter

operation,

controlled

by

VFO

or

X-tal.

The

FTdx560

has

been

designed

to

anticipate

the

amateur’s

future

operating

requirements

and

will

provide

many

hours

of

trouble

free

service.

MARKER

З

art

a=

E

IST

MIX.

GATE

CONT.

3180KHz

(1/2)

FREQ.(MHz)

|

80

9.52

|

|

p

USB

САЯН(05С.

LSB

TONE

40

13.02

LOCAL|OSC.

|

BUFF.

SETIR

|

20

2002

ПЕ

esas

ввдё

[т

——[;

—O

ExT.

VFO

-ІП

12447

СПЕ

КЕ

т

4

|

3178.5KHz

|

3181.5KHz

IOA

3402

|

|

ER

108

3452

ос

35.02

|

250735

RECEIVE

|

—

—

—

TRANSMIT

100

35.52

|

|

ЕТГІ

ММУ

16.02

|

===

RECEIVE

6

|

|

|

BAL.(MOD.

МІС.

AMP

МІС.

1

=|

4

=

|

|

DRIVER

2ND

ç

MIX.

Г.

|

{оке

јално

|

s

Ж

Я

|

ALC

RECT.

RY

TUBE

VOX{AMP.

=

1

ALC

I2AT7

I2AT7

>=

RELAY

[+7

1⁄2)

BLOCK

DIAGRAM

1---

PRINCIPLES

ОҒ

OPERATION

The

block

diagram

and

the

circuit

description

pro-

vides

you

with

a

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

crys-

tal

filter,

and

common

IF

stages.

The

low

frequency

IF

is

3,180

KHz.

The

high

frequency

IF

is

pass

band

tuned

to

cover

5,520

to

6,020

KHz.

RECEIVER

CIRCUIT:

A

signal

from

the

antenna

passes

through

the

antenna

relay

and

trap

coil,

(tuned

to

5,770

KHz),

then

to

the

tuned

circuit

and

is

applied

to

the

grid

of

the

RF

ampli-

fier,

УІ,

6BZ6.

;

The

high

frequency

oscillator

injection

signalis

also

fed

to

the

cathode

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

high

IF

pass

band

transformer.

Output

of

this

transformer

(5,520

to

6,020

KHz)

is

ap-

plied

to

the

grid

of

the

second

receiver

mixer,

V203,

6BE6.

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

KHz

difference

product

is

fed

from

the

V203

plate

circuit

to

the

Noise

Blanker

Unit.

The

output

from

V203

is

fed

to

the

base

of

the

IF

amplifier

TR351,

2SC711

and

the

base

of

the

noise

amp-

lifier

TR352,

2SC711.

The

output

from

TR351

is

fed

to

the

crystal

filter

through

the

noise

blanker

diodes

D351

and

D352,

1S1007.

The

diodes

disconnect

the

input

of

the

crystel

filter

each

time

there

is

noise

pulse.

The

diode

switch

is

driven

by

TR354.

The

switching

level

is

adjusted

by

the

noise

blanker

threshold

control

VR351.

D1301

through

D1304

are

diode

switches

which

select

the

crystal

filter

for

SSB

or

CW

operation.

The

600Hz

CW

filter

XF-31C

is

an

optinal

feature

available

at

additional

cost

from

your

dealer.

The

diode

|

switch

selects

the

CW

filter

automatically

when

the

MODE

switch

is

set

to

CW

position.

The

output

from

the

filter

is

applied

to

the

grid

of

the

first

IF

amplifier,

V204,

6BZ6.

The

signal

is

amplified

by

V204

and

V205

and

applied

through

T205

to

the

AGC

rectifier

diodes,

and

the

grid

of

product

detector

V213,

12AU7.

The

beat-frequency

oscillator

signal

which

is

generated

in

V206,

12AU7

is

applied

to

the

cathode

of

V213,

12AU7

and

the

result

is

the

detected

audio

signal.

Output

of

the

AGC

rectifier

circuit

is

applied

to

the

grid

circuit

of

the

RF

amplifier

tube

and

IF

amplifier

tubes

to

control

the

gain

of

the

receiver

automatically

and

prevent

overload-

ing.

Output

from

the

product

detector

is

applied

to

the

noise

limiter

circuit

by

a

switch

on

the

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,

which

drives

the

output

transformer

T1.

TRANSMITTER

CIRCUIT:

The

microphone

input

is

connected

to

the

grid

of

the

first

microphone

amplifier

V208A,

12AX7,

and

then

coupled

to

the

grid

of

the

second

amplifier,

V208B,

the

other

half

of

the

tube.

Output

from

V208B

is

coupled

to

the

beam

deflection

electrode

of

У207,

7360,

through

the

MIC

GAIN

control,

VR-6.

In

the

CW/TUNE

position

of

the

MODE

switch,

out-

put

from

the

tone

oscillator,

V212,

6U8,

is

fed

to

the

grid

of

the

receiver

power

amplifier

tube,

У210.

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,

У204,

6BZ6,

through

the

crystal

filter,

XF-201

of

which

the

passband

is

centered

at

3,180

KHz.

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

T204

to

the

grid

of

transmitter

VFO

mixer,

V201,

6CB6.

The

plate

circuit

of

the

first

mixer

is

connected

to

the

pass-

band

tuning

transformer

BPF5,

and

converts

the

3,180

KHz

sideband

signal

to

a

5,520

to

6,020

KHz

single

side-

band

signal.

The

passband

tuning

is

so

designed

that

it

provides

excellent

spurious

reduction.

The

output

signal

from

the

passband

network

is

fed

to

the

grid

of

the

second

mixer,

V3,

6AH6,

and

the

high

frequency

injection

signal

from

crystal

oscillator,

V2,

6BA6

is

also

fed

to

the

grid

of

V3.

This

arrangement

converts

the

IF

signal

to

the

de-

sired

transmitting

frequency.

Output

from

the

second

mixer

is

fed

through

a

tuned

circuit

to

the

grid

of

the

driver

tube,

V4,

6GK6

and

amplified

to

a

level

sufficient

todrive

the

final

linear

amplifier,

V5

and

V6,

6KD6s.

Final

output

from

V5

and

V6

is

fed

to

a

pi-section

network

consisting

of

L15

and

PLATE

and

LOAD

capa-

citors.

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

PLATE

and

LOAD

capacitor

on

the

lower

bands.

Output

from

the

pi-network

is

fed

to

the

antenna

through

the

contacts

of

the

antenna

relay.

Both

the

driver

and

final

stages

are

neutralized

to

ensure

stability.

А

section

of

the

band

switch

selects

the

capa-

citors

to

the

corerct

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

then

rectified.

by

the

ALC

rectifier,

which

in

turn

produces

a

negative

DC

voltage.

The

voltage

is

filtered

by

C61

and

R-29,

which

also

determines

the

time

constant,

and

controls

the

gain

of

V204.

This

system

allows

a

high

average

of

modulation

without

increased

distortion.

The

output

voltage

from

the

second

microphone

am-

plifier,

V208,

is

coupled

through

the

VOX

GAIN

control

to

the

grid

of

V209A,

12AT7,

and

fed

to

the

VOX

recti-

fier.

The

positive

DC

output

voltage

of

the

VOX

rectifier

is

applied

to

the

grid

of

VOX

relay

amplifier

tube,

У209В,

12AT7,

causing

it

to

conduct

current

and

actuate

the

VOX

relay

RL1.

The

relay

tube

is

so

biased

that

the

relay

is

actuated

by

the

VOX

GAIN

switch

in

the

MOX

position.

Contacts

on

the

relay

switch,

—70

volts

DC

muting

and

bias

voltage,

the

metering

circuit

from

receive

to

transmit,

the

clarifier

and

antenna

relay.

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,

VRS,

to

a

rectifier.

Negative

DC

output

voltage

from

the

ANTITRIP

rectifier,

connected

to

the

grid

of

the

VOX

tube

V209B,

12AT7,

provides

the

necessary

antitrip

threshold.

ANTITRIP

control

VR8

adjusts

the

value

of

the

antitrip

voltage

threshold

so

that

the

loudspeaker

out-

put

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.

VR13

provides

coarse

adjustment

for

relay

tube

sensitivity.

Relay

hold time

will

be

determined

by

DELAY

con-

trol,

located

on

chassis

rear

apron.

OSCILLATORS

Тһе

transceiver

contains

5

oscillators.

They

are

the

carrier

oscillator,

the

high

frequency

crystal

oscillator,

the

variable

frequency

oscillator,

the

tone

oscillator,

and

the

crystal

calibrator.

Carrier

Oscillator

The

carrier

oscillator

is

crystal

controlled

at

either

3,178.5

or

3,181.5

KHz,

depending

upon

whether

X201

or

X202

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,

to

place

the

carrier

fre-

quency

approximately

20db

down

on

the

skirt

of

the

fil-

ter

response.

The

3,178.5

KHz

crystal

frequency

is

shifted

into

the

filter

response

range

to

insert

the

carrier

for

CW/TUNE

operation.

High

Frequency

Oscillator

The

band

determining

oscillator,

V2,

6BA6,

is

crystal

controlled

by

one

of

the

9

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,

V3,

6AH6.

The

output

fre-

quency

of

this

oscillator

is

always

6,020

KHz

higher

than

the

lower

edge

of

the

selected

band.

The

output

signal

from

this

oscillator

is

the

crystal

fundamental

frequency

for

80

and

40

meters,

but

for

higher

bands,

the

crystal

frequency

isdoudledin

the

plate

circuit

of

the

oscillator.

Variable

frequency

oscillator

The

VFO

uses

a

FET

transistor,

TR401,

3SK22G,

as

the

oscillator,

and

TR402,

first

buffer

and

TR403

buffer

amplifier.

The

VFO

oscillating

frequency

is

8,700

to

9,200

KHz

to

provide

500

KHz

Band

coverage.

Varactor

diode

15145

is

in

series

with

capacitor,

C415

and

is

switched

into

the

circuit

by

the

CLARIFIER

switch

and

relay

contacts

to

shift

the

VFO

frequency.

Output

from

TR403

is

fed

through

the

SELECT

switch

to

VFO

buffer

tube

V211.

Crystal

calibrator

The

100

KHz

crystal

oscillator,TR301,2SC735Y

is

used

for

dial

calibration.

Output

from

the

oscillator,

TR301

is

fed

into

the

25

KHz

multivibrator

which

generates

a

marker

signal

every

25

KHz.

Tone

oscillator

The

tone

oscillator

operates

when

the

MODE

switch

is

in

CW/TUNE

position.

It

is

a

phase

shift

oscillator

operating

at

approximately

800Hz.

The

output

is

applied

to

the

receiver

audio

amplifier

for

sidetone

monitoring

in

CW

operation.

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

(600V

DC)

is

sup-

plied

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,

D513,1S1943

The

plate

voltage

for

all

oscillator

tubes

is

regulated

with

a

VR-105

MT,

stabilizer

tube.

сл

.

MODE

.

VOX

GAIN

AF

GAIN

.

CLARIFIER

.

MAIN

TUNING

.

LOADING

‚

PLATE

.

MIC

GAIN

CARRIER

.

PRESELE

USB/LSB:

Side

Band

selection.

CW/TUNE:

Use

transmitter

tune-up

and

code

operation.

Controls

the

VOX

gain

and

functions

for

push

to

talk,

stand-

by

or

manual

operation.

Varies

the

gain

of

receiver

audio

amplifier,

and

noise

blanker

is

connected

at

pull

position.

Varies

the

VFO

frequency

slightly

for

receiver

incremental

tuning.

Controls

operating

frequency.

Tunes

the

output

circuit

of

РІ

network.

Tunes

the

plate

circuit

of

PA

tubes.

Controls

microphone

gain

for

transmitting,

and

carrier

input

for

CW

and

tune-up.

Pretunes

signal

circuits

for

both

transmit

and

receive

condition.

10.

ТТ;

mx

6

О

Selects

operating

Бапа.

Controls

the

gain

of

RF

and

IF

stages.

Main

switch

Selects

the

meter

to

read

PA

cathode

current,

relative

power

output,

or-cathode

current

of

ALC

controlled

stage.

100

KHz:

100

KHz

calibration

25

KHz:

25

KHz

multivibration

NOR:

Operating

frequency

is

controlled

by

main

tuning

dial.

RX-EXT:

Receiving

frequency

is

controlled

by

external

VFO.

.

TX-EXT:

Transmitting

fre-

quency

is

controlled

by

external

BAND

HF

GAIN

.

POWER

.

HEADPHONE

JACK

.

MICROPHONE

JACK

.

METER

.

CALIBRATOR

on.

on.

"

SELECT.

VFO.

AGC

Changes

receiver

AGC

release

time.

RF

OUT

(B

ANT

@

GND

@

ACC

@

6000

Ф

PATCH

DELAY

i

Output

from

driver

stage

may

be

obtained

for

the

use

of

optional

equipments,

such

as

our

FTV-650

transverter.

Coaxial

connector

for

antenna.

Ground

connection.

Accessory

socket.

Pins

|

and

2

shorted

by

ACC.

plug

(11ріп

male

plug)

when

oper-

ating

without

transverter.

Receiver

output

at

600

ohm

imped-

ance

to

be

used

for

phone

ratch.

Speech

input

terminal

for

phone

patch

connection.

Impedance

is

50

kilo-ohms.

Adjusts

"hold-in"

time

of

VOX.

ANTITRIP

RELAY

S-ADJ

ALC

KEY;

VFO

BIAS

802

VFO

POWER

FUSE

FAN

тее

6

00

e

ы

©

0000000

Adjusts

VOX

anti-trip

level.

Adjusts

operating

level

of

УОХ

relay

Adjusts

S-meter

zero

setting.

Adjusts

ALC

limiting

action.

Key

jack

for.code

operation.

Input

jack

for

external

У.

Е.

О.

Adjusts

bias

on

PA

tubes.

Receiver

output

at

80hm

impedance

for

loud

speaker.

Source

for

external

V.

F.

O.

SHORT

plug

(7

pin

male

plug)

should

be

inserted

when

operating

without

external

V.

F.O..

shorting

Pins

3

and

4.

Fuse

holder.

IOamps.

for

117volts,

6amps.

for

220volts

operation.

Power

outlet

for

optinal

cooling

fan.

INSTALLATION

It

is

recommended

that

an

excessively

warm

location

be

avoided.

The

transceiver

should

be

placed

in

a

loca-

tion

that

has

adequate

space

to

permit

free

air

circulati-

on

through

the

cabinet

openings.

І

Тһе

transceiver

should

Бе

connected

to

а

good

ground

by

a

heavy

lead

to

the

terminal

marked

GND

on

rear

apron

of

the

chassis.

It

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.

OPERATION

INITIAL

CHECK

Prior

to

connecting

the

transceiver

to

power

outlet,

carefully

examine

for

any

visable

damage,

check

that

all

tubes

and

crystals

are

properly

seated

in

their

sockets,

and

check

tuning

controls

and

switches

for

complete

freedom.

Connect

the

speaker

to

jack

marked

8

ohms

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.

Insert

АСС

plug

(II

pin

male

plugshorting

pins

|

and

2)

into

ACC

socket

on

the

rear

apron

of

the

chassis,

and

check

that

SHORT

plug

(7

pin

male

plug

shorting

pins

3

and

4)

15

inserted

into

VFO

POWER

socket

on

the

rear

apron

of

the

chassis.

RECEIVER

TUNING

Set

the

controls

as

follows:

POWER

OFF

VOX

GAIN

STBY

MODE

Desired

operation

mode

BAND

Desired

Band

MIC

GAIN

Fully

counterclockwise

RF

GAIN

Fully

clockwise

SELECT

NOR

CLARIFIER

OFF

AGC

FAST

Press

the

power

switch

to

ON

position,

then

adjust

the

AF

GAIN

control

until

some

receiver

noise

is

heard

in

speaker.

Peak

the

PRESELECTOR

for

maximum

S-meter

reading,

and

tune

slowly

for

desired

signal.

INITIAL

ADJUSTMENTS

Dial

Calibration:

Set

CALIBRATION

switch

to

100

KHz

position.

Ro-

tate

tuning

knob

to

nearest

100

KHz

mark

as

indicated

on

the

lighted

main

tuning

dial.

An

audio

tone

will

be

heard

as

tuning

knob

is

rotated

through

each

100

KHz

dial

point.

Very

slowly

rotate

tuning

knob

in

the

direction

that

causes

audio

tone

to

decrease

in

frequency,

until

tone

is

just

in-

audible.

(Zero

Beat)

Hold

tuning

knob

firmly

at

this

point

and

rotate

skirt

vernier

dial

-to

zero

position.

The

skirt

vernier

dial

surrounds

the

tuning

knob

and

is

held

in

position

by

a

friction

locking

device.

This

dial

is

easily

movable

by

hand

but

will

retain

its

position

after

adjust-

ment.

The

transceiver

must

be

recalibrated

when

changing

mode

of

operation

to

LSB,

USB,

or

CW.

METER

ADJUSTMENTS:

The

transceiver

features

four

separate

meter

functions;

S-meter,

ALC

(Automatic

Limiter

Control

Indication),

IC

(Cathode

Current

of

Final

Amplifier

Tubes),

and

PO

(Relative

Power

Output

Indication).

These

functions

are

controlled

from

the

METER

switch

on

the

front

panel

and

are

adjusted

for

zero

settings

by

means

of

two

variable

potentiometers

on

the

rear

apron

of

the

chassis.

S-Meter

Adjustments

Set

VOX

GAIN

switch

to

STBY

position,

and

R.

F.

GAIN

control

to

fully

clockwise,

disconnect

antenna,

then

adjust

S-meter

control

on

chassis

rear

apron

until

meter

reads

zero.

Reconnect

antenna.

ALC

Adjustment

When

METER

switch

on

the

front

panel

is

set

to

ALC

position

the

meter

will

indicate

limiting

action.

To

adjust

meter

to

zero,

set

controls

as

follows:

MODE

USB

MIC

GAIN

Fully

counterclockwise

VOX

GAIN

МОХ

If

meter

reads

other

than

zero,

adjust

ALC

control

on

rear

apron

of

chassis

for

zero

indication.

Return

VOX

GAIN

to

STBY

position.

BIAS

ADJUSTMENT

After

warmup,

set

MODE

switch

to

USB,

METER

to

IC,

and

the

VOX

GAIN

switch

to

MOX

for

transmit

condition.

The

meter

will

indicate

PA

plate

current.

The

needle

of

the

meter

should

rise

to

IDLE

position

which

is

approximately

50

ma.

If

plate

current

is

other

than

50

ma,

adjust

BIAS

potentiometer

on

fear

apron.

VOX

ADJUSTMENT

VOX

controls

have

been

preset

for

normal

operation

settings

at

the

factory,

however,

in

the

event

of

V209

tube

replacement

it

may

be

necessary

to

readjust

controls.

Set

ANTITRIP

and

DELAY

control

on

rear

ap-

ron

of

chassis

to

end

of

counter-clockwise

travel.

Remove

microphone

from

mic

jack.

Set

VOX

GAIN

control

to

fully

clockwise

position.

|

Set

MODE

switch

to

USB

ог

LSB.

Advance

VRI3

marked

“RELAY”

clockwise

until

,

relay

activates.

Then,

decrease

slowly

the

setting

of

VR13

counter-clockwise

to

the

point

where

the

transceiver

again

turn

into

receive.