Kenwood TS-680S User manual

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GOO/AN>)I

HF

TRANSCEIVER

TS-140S

MULT!

BANDER

TS-680S

INSTRUCTION

MANUAL

KENWOOD

CORPORATION

Thank

you

for

purchasing

this

new

transceiver.

IMPORTANT:

Please

read

this

instruction

Manual

carefully

before

placing

the

unit

in

service.

SAVE

THIS

INSTRUCTION

MANUAL.

The

following

explicit

definitions

apply

in

this

manual:

Note

:

If

disregarded,

inconvenience

only,

no

risk

of

equipment

damage

or

personal

in-

jury.

Caution

:

Equipment

damage

may

occur,

but

not

personal

injury.

ST

SSNS,

This

Instruction

Manual

covers

the

following

models:

TS-140S

:

HF

Transceiver

TS-680S

:

Ail

Mode

Muiti

Bander

Illustrations

show

the

TS-140S.

CONTENTS

1.

BEFORE

OPERATION

2.

SPECIFICATIONS

AND

ACCESSORIES

2-1.

SPECIFICATIONS

2-2,

ACCESSORIES

3.

INSTALLATION

AND

CONNECTION.

3-1,

INSTALLATION

3-2.

CONNECTION

4.

OPERATION

4-1.

OPERATING

CONTROLS

4-2.

RECEIVER

OPERATION...

4-3.

TRANSMITTER

OPERATIO!

4-4.

45,

ce

4-6,

REPEATER

5.

CIRCUIT

DESCRIPTIO!

5-1.

GENERAL

DESCRIPTION.

5-2.

TRANSMITTER

SECTION

5-3.

RECEIVER

SECTION...

5-4.

CIRCUIT

BOARD

DESCRIPTION

..

6.

MAINTENANCE

AND

ADJUSTMENTS.

7.

OPTIONAL

ACCESSORIES

...

8.

REFERENCE

5-5.

BLOCK

DIAGRAM

.

5-6.

CIRCUIT

DIAGRAM

6-1.

GENERAL

INFORMATION

6-2.

SERVICE...

6-3.

CLEANING

6-4.

INCASE

OF

DIFFICULTY..

6-5.

ORDERING

SPARE

PARTS.

6-6,

ADJUSTMENTS

7-1,

CW

FILTER

INSTALLATION

7-2.

TU-8

TONE

UNIT

INSTALLATION

.

7-3.

IF-10C

INTERFACE

KIT

INSTALLATION,

7-4,

OTHER

ACCESSORIES

.

8-1.

ANTENNA

INSTALLATION.

8-2.

MOBILE

OPERATION

8-3.

RADIO

FREQUENCY

ALLOCATION.

1.

BEFORE

OPERATION

Safety

precautions

Never

remove

the

case

unless

instructed

to

da

so

in

this

Manual.

If

the

internal

parts

are

touched

ac-

cidentally,

a

serious

electric

shock

might

occur.

Never

touch

internal

parts.

If

a

metal

object,

such

as

a

hair

pin

or

a

needle,

comes

into

contact

with

the

power

socket

on

the

tear

panel,

a

dangerous

electric

shock

may

result.

For

families

with

children,

never

permit

children

to

put

anything,

especially

metal,

inside

this

unit.

-~

os

3

A

Touching

the

power

plug

when

your

hands

are

wet

may

result

in

a

serious

electric

shock.

—

ne

Never

touch

with

wet

hands.

JowSx

Never

pull,

bend

or

extend

the

power

cord.

This

could

damage

the

power

cord,

resuiting

in

a

broken

cord

or

short-circuit.

~

Atways

grasp

the

plug.

em

In

case

of

abnormal

odor

If

an

abnormal

odor

or

smoke

is

detected,

immediate-

ly

turn

the

power

OFF

and

pull

out

the

power

cord,

Contact

your

dealer

or

nearest

Service

Station.

v

#

es

Notes

on

installation

Do

not

place

the

unit

in

a

place

which

is

exposed

to

direct

sunlight,

near

a

heating

appliance,

etc.

O

—

lis

En

Do

not

store

or

use

the

unit

in

a

dusty

location

or

in

a

moist

atmosphere.

Select

a

location

where

there

is

good

ventilation.

d

=n

To

maintain

good

ventilation,

do

not

put

anything

on

top

of

the

unit.

Place

the

unit

at

least

10

cm

away

from

the

walls.

Choose

a

location

that

is

relatively

free

from

vibra-

tion.

Cleaning

Do

not

use

volatile

solvents

such

as

alcohol,

paint

thinner,

gasoline,

benzine,

etc.

to

clean

the

cabinet.

Use

a

silicone

cloth

or

@

clean

dry

cloth.

Silicone

cloth

Thinner

Benzine

re,

2.

SPECIFICATIONS

AND

ACCESSORIES

2-1.

SPECIFICATIONS

Specifications

ee

TS-1408

TS-6808

ode

J3E

(LSB,

USB),

A1A

(CW),

ABE

(AM),

F3E

(FM)

Antenna

impedance

50

ohms

Power

requirement

|

12

to

16

VDC

(13.8

VDE

reference)

|

Grounding

~

Negative

l

_

Receive

made

with

no

1.5A

:

i

&

|

current

drain

input

signal

a

é

_

Transmit

mode

204

Operating

temperature

=10

to

+50°C

(+14

to

+122°F)

Frequency

stability

—

Less

than

£10

PPM

Frequency

accuracy

_

|

Less

than

+10

PPM

Dimensions

(W

x

H

xD)

(Projections

included)

|

a

ree

1O

ee

et?

"

Weight

~

6.1kg

(13.4

bs)

!

:

160

mband

1B

to

2.0

MHe

'

80

m

band

3.5

to

4.0

MHz

40

m

band

7.0

10

7.3.

MHz

30

m

band

_

10.1

1010.15

MHz

crequeney

range

20

m

band

“14.0

1014.35

MHz

17

m

band

18.068

to

18.168

MHz

18

m

band

21.0

1021.45

MHz

12

m

band

24.89

to24.99

MHz

10

m

band

28.0

to29.7

MHz

6

m

band

——

|

50.010

54.0

MHz

[

sss

HOW

1

100W

160

m

band

~

cw

100W

#t

H

15

m

band

eee

AM

40W

4

5

12

m

band

388.

ow

=

100

W

ae

=

[

-

AM

i

_40w

&

Output

power

|

_SS8

100

W

95

Ww

—

cw

95

W

10

m

band

FM

50

W

AM

;

_

40w

&

mband

___SSB.

CW

-

FM

—

10

W

i

AM

—

aw

LSB,

USB

Balanced

modulation

Modulation

FM

Reactance

modulation

aM

Low

level

modulation

|

Spurious

radiation

(Cw

_

1.9

MHz

to

29.7

MHz

__Less

than

—

40

48

50

MHz

to

54

MHz

—

Less than

—60

dB

Carrier

suppression

More

than

40

dB

(with

1.5

kHz

reference)

Unwanted

sideband

suppression

More

than

50

dB

(with

1.5

kHz

reference)

Maximum

frequency

deviation

(FM)

£5

kHz

Frequency

response

{—6

dB)

_

400

to

2600

Hz

Microphone

impedance

;

500

ohms

to

50

ka

Specifications

ne

Model

Ts-1408

Ts-6808

|

circuitry

:

Double

conversion

superheterodyne

"

Frequency

range

500

kHz

to

30

MHz

ane

a

2

we

intermediate

frequency

1st:

40.055

MHz,

2nd:

455

kHz

I

800

kH?

to

1.6

MHz

“Less

than

3.98

nV

|

LSB,

USB,

CW

[1.6

MHz

to

21.5

MHz

____Less

than

0.26

wv

|

fat

10

dB

S+N/N)

[21.6

MHz

to

30

MHz

|

Less

than

0.25

xV_|

Less than

0.18

pV

»2

i

60

MHzta54MHz

|)

Less than

0.16

pV

+2

_

[

600

kHz

to

1.6

MHz

Less than

39.8

pV

~

Sensitivity

AM

1.6

Mez

to

21.5

Miz

Less

than

2.5

nV

|

(at

10.d8S+N/N)

|

21.5

MHz

to30

MHz

|

Less

than

2.5

.V_|

Less

than

1.78

pV

«2

.

|

50

MHz

to

54

MHz

=

Less

than

1.58

xV

«2|

2)

FM

21.5

MHz

to

30

MHz_|

Less

than

0.35

»V_|

Less

than

0.18

pV

«2

ce

(at

12

dB

SINAD)

~—

|

50

MHz

to

54

MHz

—

Less

than

0.18

pV

+2

;

LSB,

USB,

CW

6

dB:

2.2

kHz,

—60

dB:

4.4

kHz

Selectivity

7

AM

=6

dB:

6

kHz,

—50

dB:

18

kHz

—

FM

i

—6

dB:

12

kHz,

—

50

dB:

25

kHz

Image

ratia

More

than

50

dB

——

ae

|

Ist

IF

rejection

More

than

50

dB

IF

SHIFT

variable

range

More

than

+1.2

kHz

~

10

Hz

STEP

"More

than

£

1.2

kH?

RIT

variable

range

a

po

nse

20

Hz

STEP

More

than

*2.5

kHz

Squelch

sensitivity

(EM)

Less than

0.32

4V

'

Output

1.5

W

across

8

ohms

load

(10%

distortion)

Output

load

impedance

_

7

_

8

~

16

ohms

Notes:

-

soe

n=:

1.

*1:

The

output

power

on

the

160

m

band

is

limitted

to

10

W

depending

on

local

regulations.

2.

*2:

This

is

valuable

when

the

RF

AMP

switch

is

turned

ON.

3.

Circuit

and

ratings

are

subject

to

change

without

notice

due

to

advancements

in

technology.

2-2.

ACCESSORIES

Unpack

your

TS-140S/680S

carefully

and

confirm

that

it

is

supplied

with

the

following

accessories.

Dynamic

microphone

(Except

European

and

U.K.

version)

.191-0352-05..

ea.

DIN

plug

(7-pin)

-E07-0751-05

ea.

DIN

plug

(13-pin).

-E07-1351-05

ea.

DC

power

cable

assembly

-E30-2065-05

ea.

Calibration

cable.

-E31-2154-05

ea.

Fuse

(20A)....

-FO5-2036-05

..

ea.

Instruction

manual

-B50-8199-XX

.

copy

Warranty

card...

ea.

After

unpacking

Shipping

container:

Save

the

boxes

and

packing

in

the

event

your

unit

needs

to

be

transported

for

remote

operation,

maintenance,

or

service.

3.

INSTALLATION

AND

CONNECTION

3-1.

INSTALLATION

3-1-1.

Bail

The

transceiver

can

be

elevated

for

operating

conve-

nience.

Caution:

Do

not

use

the

bail

to

carry

the

transceiver.

3-2.

CONNECTION

3-2-1.

Fixed

Station

The

TS-140S/680S

requires

more

than

20A

at

13.8

VDC

when

transmitting

at

full

power.

Use

the

PS-50

or

PS-430

power

supply

far

fixed

station

operation.

A.

Rear

Panel

To

antenna

“chee

1S-1408_

SP-430

To

the

external

appiiences

———$=_———|

¥§

y

To

AC

outlet

To

antenna

tuner

By

Orne

Data

communications

device

SS

EXCITER,

TS-140/680S

j

Ha

CECE

bono

265

iy

JoGe

=e

;

Z

~~]

ot

BLACK

AC

LINE

AED

GROUND

BUSS

RF

OUTPUT

(AUTON:

Do

not

connect

the

power

cable

unless

the

‘TL-922A

POWER

switch

is

set

to

the

OFF

TL-922A

Interconnection

to

TS-140S/680S

—

Peston:

(1)

Antenna

Caution:

Protect

your

equipment—Use

a

LIGHTNING

AR-

RESTER.

The

type

of

antenna

that

is

used

will

greatly

affect

the

performance

of

the

transceiver.

Use

a

properly

adjusted

antenna,

of

good

quality,

to

enable

your

transceiver

to

perform

at

its

best.

The

antenna

input

impedance

is

50

ohms.

Use

50-ohm

coaxial

cable

such

as

5D-2¥V

for

this

connection.

If

the

antenna

is

far

from

the

transceiver

the

use

of

low

loss

coaxial

cable,

such

as

5D-2V

is

recommended.

Match

the

impedance

of

the

coaxial

cable

and

that

of

the

anten-

na so

that

the

SWR

is

less

than

1.5

to

t.

The

protec-

tion

circuit

in

the

transceiver

will

activate

if

the

SWR

is

particularly

poor

(greater

than

3

to

1}.

High

SWR

value

will

cause

transmitter

output

to

drop,

and

may

lead

to

TVI

or

BCI

reports.

(2)

Grounding

Caution:

Never

use

a

gas

pipe

or

electrical

conduit

pipe.

Notes:

1.

A

ground

connection

that

is

a

1/4

wavelength

or

its

multiple

may

provide

a

goad

DC

ground,

but

it

will

nat

provide

a

good

AF

ground.

2.

A

city

water

pipe

cannot

be

used

as

a

goad

earth

in

some

cases.

Making

a

good

earth

connection

is

important

for

preventing

dangers

such

as

electric

shock

and

for

emitting

a

high

quality

signal

with

minimum

spurious

radiation,

Bury

a

commercially

available

ground

rod

or

copper

plate

under

the

ground

and

connect

it

to

the

GND

terminal.

A

thick

wire,

cut

as

short

as

possi-

ble,

should

be

used

for

the

connection.

To

make

a

good

earth

connection,

connect

the

GND

terminal

to

a

grounded

metal

water

pipe.

{3}

External

speaker

The

TS-140S/680S

includes

a

built-in

speaker.

If

you

would

like

to

use

an

external

speaker,

such

as

the

SP-430,

it

may

be

connected

to

the

EXT

SP

jack

on

the

rear

of

the

radio.

The

speaker

may

be

any

good

8

chm

permanent

magnet

type

speaker.

The

diameter

should

be

at

least

4

inches

for

good

audio

quality.

If

you

plan

on

using

a

speaker

other

than

the

SP-430

it

should

be

equipped

with

a

miniature

phone

jack

plug.

The

internal

speaker

is

disabled

when

the

external

speaker

plug

is

inserted

into

the

receptacle.

(4)

Key

connection

Your

key

should

be

connected

as

illustrated

in

the

figure

below.

When

using

an

electronic

keyer,

make

sure

that

polarity

is

set

for

positive.

Always

use

shielded

line

from

the

key

to

transceiver.

Before

connecting,

check

that

the

polarity

is

correct.

The

KEY

jack

pro-

vides

+5.5

V.

Use

shielded

cable.

Key

connection

x

5

a

é

¢

g

a

a

g

B.

Front

Panel

O)

Headphones

e

a

Microphones

(1)

Headphones

Any

low-impedance

(4~

16

ohms)

headphones

may

be

used

with

the

transceiver.

Connect

the

head-

phones

to

the

front

panel

phone

jack.

The

optional

HS-5

or

HS-6

headphones

are

best

suited

for

use

with

the

transceiver.

Stereo

type

headphones

can

also

be

used.

(2)

Microphones

Any

microphone

with

an

impedance

between

500

and

50

kf

may

be

used

with

this

transceiver.

The

KENWOOD

microphones

MC-43S

(handheld),

MC-60A,

MC-80,

MC-85

(table-top

type)

are

recommended.

You

can

switch

send/receive

by

voice

if

a

voice

con-

troller

is

connected.

(TS-680S

only)

(3)

Voica

Controller

{TS-680S

only)

We

recommend

the

use

of

VOX-4.

Simply

connect

the

MIC

cable

to

the

MIC

jack.

7

3-2-2.

Mobile

Antenna

SP-50B

or

SP-40

(For

use

external

speaker!

A.

Battery

connection

Connect

the

supplied

power

cable

with

fuse

directly

to

the

battery

terminals.

Connecting

to

the

cigarette

lighter

socket

can

cause

a

poor

connection,

and

ex-

cessive

voltage

drop.

Cautions:

1.

Before

installing

the

power

cable,

be

sure

to

remove

the

negative

lead

from

the

battery

for

safety.

2.

After

installation

and

wiring,

be

sure

to

double

check

for

correct

installation

before

reconnecting

the

negative

lead

to

the

battery

terminal.

3.

If

the

fuse

opens,

be

sure

to

check

that

each

con-

ductor

has

not

been

damaged

by

short-circuiting,

etc.

Then

replace

with

a

new

fuse

of

the

same

rating.

4,

After

completing

the

wiring,

wrap

the

fuse

holder

with heat

resistant

tape

to

protect

against

heat

and

moisture.

5.

Do

not

remove

the

fuse

even

if

the

power

cable

is

too

long.

B.

Ignition

Noise

The

transceiver

has

been

designed

to

suppress

igni-

tion

noise;

if

excessive

noise

is

present,

it

may

be

necessary

to

use

suppressor

spark

plugs

(with

resistors).

Accessories

DC

cable

‘Transcerver

Ce

alletiA

Rin

if

ee

le

wes

i

Rubber

grommet

To

battery

@

Consider

ease

of

operation

and

safety

when

selecting

the

installation

location

when

installing

the

transceiver

in

a

vehicle.

White/Red

Fuse

Make

sure

the

positive

(+)

and

negative

(—)

lead

polarity

are

correct

when

wiring

to

the

battery.

Engine

compartment

TH

Passenger

compartment

Black/Gray

is]

y

To

the

transceiver

f

“TT

@e

Select

the

location

where

the

power

cable

Battery

is

protected

from

heat,

moisture

or

abrasion

secure

the

cable.

Chassis

oF

fice

wall

7

Make

sure

the

cabie

does

not

directly

con-

tact

the

edge

of

the

hole

by

using

a

grommet.

4.

OPERATION

4-1.

OPERATING

CONTROLS

4-1-1.

Front

Panel

®

®

®

©

O®

Note:

All

segments

on

the

Display

Panel

and

Indicators

are

shown

on

for

this

explanation.

@

@

O

OOM

@

arbor

ber

|

Power

eters

som

cf

wonscan

auro8

shut

NL

|

fore

SR

eu

Co

eat

ee

Aunt

6668.8.

BBBB_

-al

|||

Ga

=0N

GOFF

E.

KENWOOD

=

fu"ehod.

=

40s

-

PHONES

(“MEMORY

McH¥FO

CH

SS

an

froFre

we

‘ 8

RF

GAIN

Magy

——AX.

NB

LEVEL

Coreaaerrey

EAD

eanoOB

|

we

er

net

naz

89eQesd

Mic

CY:

ean

Bo

Hl

a

Lt

=

2

@

GP

Be

|

a

ace

Petry

Ce

@

POWER

switch

Press

to

turn

the

power

ON

or

OFF.

@

Program

keys

F.LOCK

:

The

selected

dial

frequency

and

mode

are

locked.

MrV

:

Used

to

transfer

a

frequency

from

memory

to

the

VFO.

M.IN

:

Used

to

enter

data

into

a

memory

channel.

VFO/M_:

Used

to

switch

between

memory

or

VFO

operations.

SCAN:

Pressing

during

VFO

operation

will

initiate

Program

scan,

and

pressing

during

memory

operation

will

initiate

memory

scan.

:

Used

when

reentering

memory

channel

data,

erasing

a

memory

channel,

clearing

scan,

or

when

specifying

the

channels

that

will

be

skipped

during

scan

opera-

tions.

CLEAR

@

Meter

During

receive

the

meter

is

used

as

an

S-meter.

Dur-

ing

transmit

the

function

of

the

meter

is

controlled

by

the

Meter

switch

@?

,

and

provides

either

ALC

level,

or

PWR

(power)

readings.

@

M.CH/VFO

CH

(Memory

channel/VFO

channel)

control

This

control

is

used

to

change

the

frequency

in

10

kHz

steps

during

VFO

operations.

This

is

convenient

when

large

changes

in

the

operating

frequency

are

(With

the

TS-680S]]

i

22)

2

2D 49

18

required

and

for

FM

operations.

This

control

is

also

used

to

select

the

desired

memory

channet

during

Memory

Channel

Operation.

®

Indicators

ON

AIR

:

Lights

during

transmit.

M.SCR

:

Lights

when

the

M.IN

key

is

pressed.

When

the

memory

scroll

function

is

active

you

can

review

the

contenis

of

the

Memory

channels

without

a

loss

of

the

in-

coming

receive

frequency.

F.LOCK

:

Lights

when

the

F.LOCK

key

is

ON.

1MHz_:

Lights

when

the

1

MHz

step

switch

is

ON.

(©

MODE

keys

These

keys

are

used

to

select

the

desired

mode

of

operation.

In

CW

mode

the

CW/N

key

is

also

used

to

select

the

desired

filter

bandwidth.

When

a

MODE

key

is

pressed

the

first

character

of

that

mode

will

be

sounded

in

Morse

code

thru

the

internal

speaker.

This

announcement

can

be

inhibited

by

following

the

instructions

in

Section

4-2-8.

LSB/USB

key

:

Press

the

LSB/USB

key

to

alternate

between

LSB

and

USB.

:

Press

the

CW/N

key

to

alternate

be-

tween

CW

(SSB

filter)

and

N

(nar-

row).

Note.

——_________

There

will

be

no

audio

from

the

speaker

in

the

CW

narrow

position

if

no

optional

CW

filter

is

installed.

:

Press

the

AM/FM

key

to

alternate

between

AM

and

FM.

CWIN

key

AMI/FM

key

@®

Display

Panel

The

fluorescent

display

tube

displays

operational

in-

formation

such

as

the

operating

frequency,

memory

channel

information,

and

RIT

information.

(See

page

13.)

@®

FUNCTION

keys

A/B_

:

Selects

VFO

A

or

VFO

B.

SPLIT:

For

split

frequency

operations;

A-R,

B-T

(A

receive,

B

transmit},

or

B-R,

A-T.

A=B

:

Equalizes

the

frequencies

and

modes

of

VFO

A

and

VFO

B.

@®_

RIT

control

When

the

transmit

frequency

of

the

distant

station

drifts

a

little

bit

during

the

QSO,

but

you

do

not

wish

to

alter

your

transmit

frequency

ta

compensate,

you

may

wish

to

make

use

of

the

RIT

control

function.

This

control

allows

shifting

the

receive

frequency

without

shifting

the

transmit

frequency.

The

RIT

control

allows

you

to

shift

the

receiver

frequency.

This

control

is

also

useful

far

pileups

when

the

DX

station

is

transmitting

a

little

above

or

belaw

his

receive

frequency.

The

RIT

step

size

is

either

10

Hz

or

20

Hz.

Please

refer

to

Section

4-2-8

for

information

on

how

to

select

the

desired

step

size.

Notes:

-

1.

The

RIT

offset

is

displayed

on

the

main

display.

You

can

therefore

preset

the

offset

before

you

actually

need

to

use

it.

When

you

move

to

another

station

make

sure

you

turn

OFF

the

RIT

switch,

2.

The

figure

at

the

right

illustrates

that

the

RIT

display

and

the

VFO

display

may

not

agree

exact-

ly

in

all

instances

since

the

RIT

and

VFO

tune

in

10

Hz

steps.

The

normal

resolution

of

the

VEO

is

100

Hz,

so

if

the RIT

or

VFO

is

turned

slowly

the

associated

display

may

not

update

immediately.

You

will

have

to

tune

100

Hz

to

see

the

display

actually

change.

40

IF

SHIFT

control

The

IF

SHIFT

control

allows

you

to

shift

the

IF

pass-

band

of

the

receiver,

without

changing

the

actual

center

frequency

of

the

receiver.

This

control

is

useful

when

there

is

interference

near

your

center

frequency.

*

USB

mode

Interference

from

lower

frequencies

can

be

teduced

or

eliminated

by

rotating

the

IF

SHIFT

control

in

the

@

direction.

This

will

cause

the

resulting

audio

frequencies

to

have

a

slightly

tre-

ble

response,

i.e.low

cut

filter

(low

frequencies

attenuated).

Interference

from

higher

frequencies

can

be

reduced

or

eliminated

by

rotating

the

IF

SHIFT

control

in

the

©

direction.

This

will

cause

the

resulting

audio

frequencies

to

sound

a

little

bassy,

i.e.high

cut

filter

(high

frequencies

at-

tenuated}.

¢

LSB

mode

Interference

from

lower

frequencies

can

be

reduced

or

eliminated

by

rotating

the

IF

SHIFT

control

in

the

@

direction.

This

will

cause

the

resulting

audio

frequencies

to

sound

a

little

bassy,

just

the

opposite

of

the

effect

in

the

USB

mode.

Interference

from

higher

frequencies

can

be

reduced

or

eliminated

by

rotating

the

IF

SHIFT

control

in

the

©

direction.

This

will

cause

the

resulting

audio

frequencies

to

appear

a

little

on

the

high

side,

again

just

the

opposite

of

the

USB

mode,

Note:

-

-

The

IF

SHIFT

control

does

not

function

in

the

AM

or

FM

modes.

‘Turned

counterclockwise

IF

titer

passbang

=

charactenstic

Turned

clockwise

®

Signal

?

Signal

Signal

/

©

intertering

signal

©

Interfering

signal

O

RIT

-@-1F

SHIFT

RIT_@-IF

SHIFT

=

RIT_-@-iF

SHIFT

ES

Turn

the

knob

counterclock-

wise

to

eliminate

interference

trom

signal

@).

Turn

the

knot

clockwise

to

eliminate

interference

from

signal

@).

IF

SHIFT

operation