Hallicrafters SX-140 Manuale di formazione

OPERATING

AND

SERVICE

INSTRUCTIONS

COMMUNICATIONS

RECEIVER

MODEL

SX-140

"The Hallicrafter's Company warrants each new radio product manu-

factured

by

it to be

free.

from defective material and workmanship

and agrees to remedy any such defect

or

to furnish a new part in ex-

change

for

any

part

of

any unit

of

its manufacture which under

nor-

mal installation, use and service discloses such defect, provided the

unit

is

delivered

by

the owner to our allthorized

raclio

dealer, whole-

saler, from whom purchased, or, authorized service center, illtact,

for

examination, with all transportation charges prepaid within ninety

days from the date

of

sale to original purchaser and provided that

such examillation discloses in our judgment that

it

is

thus defective.

This warranty does not extend to any

of

our radio products which

have been subjected to misuse, neglect, accident, incorrect wiring not

our own, improper installation,

or

to use in violation

of

instmctions

furnished by us, nor extended to units which have been repaired

or

altered outside

of

Ollr

factory or authorized service center, nor to cases

where tile serial number thereof has been removed, defacedorchanged,

nor to accessories used therewith not

of

our own manufacture.

Any

part

of

a unit al'l"oved

for

remedy

or

exchange hereunder will

be remedied

or

exchanged

by

tile allthorized radio dealer

or

whole-

saler without charge to the owner.

This warranty

is

in lieu

of

all other warranties expressed or implied

and no representative or I,erson

is

allthorized to

aSSlime

for

liS

allY

other liability in connection with the sale

of

our radio products:'

092-

010393

Figure

1.

Hal/icrafters

Model

SX-140

SECTION I

GENERAL

INFORMATION

The

new

Hallicrafters

Mo

del

SX-140

is

a

pr

ec

isi

on

built,

hi

g

hl

y

sensitive,

co

mmuni

ca

ti

o

ns

r

ec

eiver

pr o

vidin

g

co

ver

ag

e

within

the

fr

equen

cy

r

ang

e of

3.5

me

gacyc

les

to 54

me

gacyc

le

s.

For

ea

se

and

fle

x

ibili

ty of o

perati

on, a s

in

g

le

tunin

g

co

ntr

ol

is

pr

o

vid

ed which

cov

ers

the

eas

y

-to-

re

ad

slide-rule

dial

spe

c

ifi

c

all

y

ca

libr

a

ted

for

the

80,

40

, 20,

15,

10

an

d 6 me

ter

ba

nds.

Fi

ve

tube

s

p

lu

s two

sili

co

n

re

c

tifi

e

rs

are

empl

oy

ed

in

the

la

test

superheter

odyne Circ

uit

and

pr

ov

isi

on

is

made for

the

re

c

epti

on of a

mplitu

de mo

dul

a

ti

on

(A

M)

,

sin

gle

-sideband

(S

SB), and

co

ntinu

ous wa

ve

(CW) signa

ls

ov

er

the

e

ntire

tunin

g r an

ge

.

For

co

ntr

ol of sel

ec

ti

v

it

y,

a r

ege

ner a

ti

ve

int

e

rm

e

di

a

te-fre

qu

ency

st

ag

e is e

mpl

oye

d.

This

co

ntr

ol of

re

g

ener

a

ti

on al

so

pr

ovid

es

a boo

st

in

se

nsiti

v

it

y to

brin

g

in

w

eak

or d

ist

a

nt

st

a

ti

o

ns

that wo

ul

d o

rdin

a

ril

y

be

lo

st

in

th

e b

ac

kgr o

und

nois

e.

A c

arri

er le

vel

meter

pr

o

vides

an

a

id

for

a

cc

ur

a

te

tunin

g a

nd

a

me

a

ns

of

determinin

g

the

r ela

tive

strength

of

re

c

ei

v

ed

si

gna

ls.

The

a

li

g

nm

e

nt

pr

oc

edure

for

th

e r

ec

eiver

h

as

b

ee

n g

reatl

y

simplifi

ed

with

the

use of a

b

uilt-in

cr y

st

al osc

ill

ator c

ir

c

uit

to g

en

er ate

th

e

req

uir

ed

signals for a

li

g

nm

e

nt.

A 1650-KC cr y

s-

ta

l

(n

ot

supplied)

,

plu

gge

d

int

o

th

e cr

ys

tal

ca

libr

a-

tor s

oc

ket ,

will

pe

rmit

th

e

IF

tr

a

nsf

o

rm

er s to

be

a

li

g

ned

with

th

e

us

e of

th

e C

ar

ri

er Level meter

as

an o

utput

indi

ca

to

r.

Othe

r

sp

ec

ial

feat

ur

es

inc

lu

de

:

auxi

li

ar y

• 1 •

switching,

contr

o

llin

g

an

a

ntenna

changeo

ver

re-

lay,

turnin

g on

the

transmitter,

or

sh

o

rtin

g

th

e

speaker

voice

co

il

durin

g

tr

a

nsmittin

g (with

th

e

FUNCTION

co

ntr

ol

set

to STANDBY).

The

SELEC-

TI

V

ITY

-BFO

co

ntr

ol,

with

its

as

soc

iated

c

ir

c

uitr

y,

permits

co

ntinu

o

usl

y v

ari

a

ble

sele

c

ti

v

it

y on AM

re

c

epti

on to

th

e po

int

wher

e

the

BFO

starts.

Be

yon

d

this

po

int,

the

c

ir

c

uitr

y

permits

r

ec

epti

on

of CW

and

upper

or lo

wer

SSB

si

g

nals

.

The

pitch

of a CW

si

g

nal

m

ay

be

vari

ed

with

this

co

ntr

o

l.

The

cr y

stal

osc

illat

or

ci

r c

uit

utiliz

es

. a

3.5-MC

cr y

st

al

whi

ch p

ermits

th

e o

per

ato

r to

se

t

the

low

frequen

cy

end

s of

the

80,

40,

20, 15

and

10

meter

ban

ds

and

52.5

MC

on

the

6

meter

ba

nd.

NOTE

Careful

a

ttenti

on

sh

o

uld

be

dire

c

ted

to

the

INSTALLATION

and

OPERATION

instru

c

ti

o

ns.

The

y

ha

ve

been

pr

ov

ided

to

insure

satisf

a

ctory

o

per

ati

on

fr

om

this

Ha

lli

c

rafters

pre

ciSion

built

pr

o-

du

ct.

The

re

ce

iv

er

has

an

unusuall

y

hi

gh d

eg

ree

of

sensitivit

y

necessar

y to

r

ece

ive

weak

and

distant

st

a

tions.

Carele

ss

o

per

a

ti

on of

ahi

gh

sensitivit

y

r

ec

ei

ve

r m

ay

r

es

ult

in

ex

c

essi

ve no

ise

or b

ac

kgr ound

hiss.

These

undesir-

a

ble

eff

ec

ts

ca

n

be

held

to a

minimum

by

care

ful

a

djustment

of

the

SELEC-

TIVITY

, TUNING, AUDIO GAIN

andRF

GAIN

co

ntr

o

ls

as

well

as

the

proper

sel

ec

ti

on and a

rr

ang

ement

of

the

an-

te

nna.

SECTION

II

TECHNICAL

DATA

TECHNICAL SPECIFICATIONS

TUBES

.........

0 • , 0

•••••

0

••••••

0 0 0

Five,

plus

two

Silicon

Rectifiers

HEADPHONE

OUTPUT

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

..

Low

to

medium

impedance

(see

para.

3-6)

ANTENNA

INPUT.

. . . . . . . . . . . . . . . . . •

..

Single

wire

or

any

50-75

ohms,

unbalanced

POWER CONSUMPTION

..

. . • . . . . . . . . .

•.

47

watts

AUDIO

OUTPUT

IMPEDANCE

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

3.2

ohms

DIMENSIONS. . . . . . . . . . . . . . . . . . • . . .

..

13-3/8"

wide,

8-1/4"

deep,

7-3/16"

high

NET

WEIGHT

..•....................

13.5

pounds

SHIPPING

WEIGHT.

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

..

14

pounds

RECEIVER

FREQUENCY COVERAGE

BAND IN FREQUENCY INTERMEDIATE OSCILLATOR

METERS

RANGE FREQUENCY FREQUENCY

RANGE

80

3.5-4.0

MC

1650 KC 5150-5650 KC

40

7;0-7.3

MC

1650 KC

8650-8950

KC

20

14.0-14.4

MC 1650 KC

15650-16050

KC

15

21.0-21.5

MC

1650 KC

11325-11575

KC

10

28.0-29.9

MC

1650 KC 14825-15775 KC

6

50.0-54.0

MC

1650 KC 24175-26175 KC

FCC

BAND

LIMITS

3.5-4.0

MC

7.0-7.3

MC

14.0-14.35

MC

21.0-21.45

MC

28.0-29.7

MC

50.0-54.0

MC

On

some

bands

the

frequency

range

of

the

receiver

has

been

extended

above

the

actual

FCC

band

limits

to

include

the

reception

of

some

of the

special

service

frequencies.

The

oscillator

frequency

on

the

80,

40,

and

20

meter

bands

is

higher

than

the

received

sig-

nal

by

the

IF

frequency.

On

the

15

and

10

meter

bands,

the

oscillator

second

harmonic

is

used

which

is

higher

than

the

received

signal

by

the

IF

frequency.

On

the

6

meter

band,the

oscillator

second

harmonic

is

used

which

is

lower

than

the

received

Signal

by

the

IF

frequency

•

2·

SECTION

III

INSTALLATION

3-1.

UNPACKING

Mter

unpacking

the

receiver,

examine

it

closely

for

damage

which

may

have

occurred

in

transit.

Should any

sign

of

damage

be

apparent,

file

a

claim

immediately

with

the

carrier

stating

the

extent

of

damage.

Carefully

check

all

shipping

labels

and

tags

for

instructions

before

removing

or

destroying

them.

3-2.

LOCATION

The

receiver

is

equipped

with

rubber

mount-

ing

feet

for

table

or

shelf

mounting. When

locating

the

receiver,

avoid

excessively

warm

locations

such

as

those

near

radiators

and

heating

vents.

Allow

at

least

one inch of

clearance

between

the

back

of the

receiver

and the

wall

for

proper

venti-

lation.

3-3.

POWER

SOURCE

The SX-140

Receiver

is

designed

to

operate

from

a 105-125 volt, 60

cycle

AC

power

source.

Power

consumption

is

47

watts.

NOTE

If

in

doubt about

your

power

source,

contact

your

local

power

company

prior

to

inserting

the

power

cord

into

an

AC

power

outlet.

Connecting

the

receiver

to

the

wrong

power

source

may

cause

figure

2.

Single Wire

Antenna.

.

J.

extensive

damage

to

the

unit

and

costly

repairs.

3-4.

ANTENNAS

The

RF

input of

the

receiver

is

designed

for

operation

from

either

a

single-wire

antenna

(fig.

2),

a

half-wave

doublet

or

other

tuned

antenna

with

transmission

line

impedances

from

50 to

75

ohms

(fig.3 and 4.). Antenna

connections

are

made

to a

two-terminal

strip

at

the

rear

of the

receiver

marked

A (antenna) and G

(chassis

ground).

The

single

wire

antenna

(fig.

2)

may

be

used

in

an

area

where

antenna

space

is

limited.

When

using

this

antenna,

a

ground

lead

from

terminal

G to a

water

pipe

or

other

earth

ground

will

im-

prove

reception.

For

the

best

performance,

however,

a

co-

axial-fed

dipole,

tuned

to

the

center

of the

desired

band,

is

the

recommended

type of

antenna

to be

used

(fig. 3). The

impedance

of

this

antenna

is

approximately

75

ohms.

When

using

this

antenna,

the

center

conductor

of the

coax

is

connected

to

terminal

A and the

outer

conductor

(braid

shield)

is

connected

to

terminal

G.

For

further

information

regarding

antennas,

refer

to the

"A.R.R.L

..

Antenna Book",

pub-

lished

by

the

American

Radio

Relay

League,

West

Hartford,

Conn., U.S.A.

I

468.,j

4

LIFEET),

FREOUENCYIMC) I

092-0092098

figure

3.

Dipole

Antenna

Using

Coaxial

Lead-in.

468

1

r

UFEETl·

FREQUENCY

IMC j

~

50-750HM

~¥

0

o~

TWIN

LEAD

!NSULATOR [§fBi]

09Z-0092!OC

Figure 4.

Dipole

Antenna

Using Twin Lead-in.

3-5.

SPEAKER

CONNECTION

The

speaker

terminal

board

is

marked

SPKR and GND.

Internally,

the

hot

lead

from

the

output

transformer

is

connected

through

the

PHONES

jack

(J1) to

the

SPKR

terminal;

the

other

transformer

lead

is

connected

to

chassis

ground.

3-6.

HEADPHONES

The headphone

jack,

marked

PHONES,

is

located

on

the

front

panel

of

the

receiver

(as

seen

in

figure

5)

and

is

wired

to

automatically

disable

the

speaker

when

the

headphones

are

plugged

in.

The

headphone output

impedance

is

not

critical,

and any

commercial

headphones

may

be

used,

in-

cluding

crystal

types,

as

no

direct

current

flows

in

the

headphone

circuit.

For

maximum

headphone

output, the

use

of

low-impedance

magnetic

phones

(50

to

1000 ohm)

is

recommended.

3-7.

TYPICAL

SYSTEM

CONNECTION

A

four

terminal

strip

is

provided

at

the

rear

of

the

chassis

to

connect

the

Receiver

into

a

station

control

system

(see

figs. 6 and 7). With

the

FUNCTION

switch

in

the

STANDBY

position,

terminals

1 and 2

are

shorted

together

as

are

terminals

3

and

4,

thus

providing

auxiliary

switch-

ing

functions.

Figure

6

illustrates

the

receiver

controlling

the

antenna

changeover

relay

and

the

station

transmitter

(such

as

the

HT-40).

Figure

7

illustrates

the

Receiver

controlling

the

station

speaker

and

available

contacts

for

another

auxi-

liary

switching

function.

SECTION

IV

FUNCTION

OF

OPERATING

CONTROLS

4-1.

GENERAL

Each

control

of

the

receiver

performs

a

definite

function

which

contributes

to

its

reception

capabilities.

Full

appreciation

of

the

receiver

is

to

be

expected

only

after

becoming

familiar

with

each

of the

controls

and

the

effect

each

control

has

on

the

performance

of

the

receiver.

A

brief

description

of

each

control

is

con-

tained

in

the

following

paragraphs

(see

figure

5).

4-2.

FUNCTION

CONTROL

The

FUNCTION

control,

a

four-position

ro-

tary

switch,

is

used

to

select

the

desired

operating

condition of

the

receiver.

Auxiliary

switching

functions

are

also

controlled

by

this

switch,

refer

to

paragraph

3-7.

Operating

conditions

for

each

switch

position

are

as

follows:

1.

In

the

OFF

position,

no

power

is

applied.

2. In the STANDBY

position,power

is

ap-

plied

to

the

receiver;

however,

a

high

negative

bias

is

applied

to the

RF

tube

(VIA)

grid

to

prevent

the

reception

of

signals.

.4

•

3.

In

the

AMposition,

amplitude

modulated

signals

may

be

received

and the

AVC

circuit

is

activated.

4.

In

the

CW

-SSB

position,

continuous

wave

and

single-sideband

signals

may

be

received.

The

AVC

is

reduced

for

CW

and SSB

reception.

The

carrier

level

meter

is

disabled

to

prevent

damage

by

a

strong

signal.

4-3.

BAND

SELECTOR

CONTROL

The

BAND

SELECTOR

control

is

a

six-posi-

tion

rotary

switch,

permitting

the

receiver

to

receive

Signals

on

either

the

80,40,20,

15, 10,

or

6

meter

band.

4-4.

CAL-OFF

CONTROL

The

CAL-OFF

control

is

a

DPDT

slide

switch.

In

the

CAL

position,

the

3.5-MC

crystal

marker

circuit

is

actuated

and

provides

beat

sig-

nals

at

3.5,

7.0,

14.0,

21.0,

28.0, and 52.5 MC.

With

the

switch

in

the

OFF

pOSition,

the

crystal

marker

circuit

is

disabled

and no

beat

notes

will

be

heard.

PO

NT

T

r-

I

ER

ALIGNMEN

MARK

\\

CARRIER

LEVEL

MAIN

TUNING

FREQUENCY

IN

MEGACYCLES

80

M

FREQUENCY

IN

MEGACYCLES

::n

CQ

c:

...

tD

!.II

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."

...

0

::J

II

,I,

U I i

,310u1~,

rt

3;5

3,,6

3l

3;8

3.9

4.0

40

M

(Q),I

II

SIINITS

DB

OYER

sa

7.0

7

il

7.2 7.3

10

M

14

iO

I~I

I

1~3

14.4

ANT

TRIM

CAL

RESET

15

M

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2~0

2~.1

2F

21.3

2~4

2~5

0 0

10

M

• • •

21

0

2~5

29

2~.5

29.9

RECEIVER

""

~

5~O

51.0

65 P

53.0

5~0

the

hallicrafters

CD.

MODEL

5X-140

'"tI

Q

FUNCTION

PHONES

BAND

SELECTOR

CAL

R.F.

GAIN

ANL

SELECTIVITY

AUDIO

GAIN

::J

tD

20

15

B.

F.

O.

,

..

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,,"0'·

0 0 ® 0

A.M.

0

..

II

STAND

BY

OFF

h

092-0095598

S)(-140

RECEIVER

CONTACTS

OF

FUNCTION SWITCH

~AM.CW-SSB

1-',

--"';>

STANDBY

,--,--.-...

I

~~

~O

~~~H~

~~

0

0e

~G~

0

!

EXTERNAL

POWER SOURCE

'\[7

I-IT-

40

TRANSMITTER

SWITCH CONT.e.CTS SHOWN

IN

NORMAL

OR

RECEIVING POSITION

Figure

6.

Station

Control, Receiver Controlling

Antenna

Relay

and

Transmitter.

sx

-

140

RECEIVER

CONTACTS OF

FUNCTION SWITCH

AN, CW-SSB

AUXILIARY

SWITCH'''G

CONTACTS

SWITCH CONTACTS SHOWN

IN

NORMAL

OR RECEIVING POSITION

HT

-

40

TRANSMITTER

CONTACTS

OF

FUNCTION SWITCH

~

STANDBY

ElCTERNAl.

Pa..'ER SOURCE

Figure

7.

Station

Control, Transmitter Controlling

Antenna

Relay.

- 6 -

092-0096298

4-5.

ANL-OFF

CONTROL

The

ANL-OFF

control

is

a

SPDT

slide

switch.

When the

ANL-OFF

switch

is

in

the ANL

position,

the

noise

reducing

circuit

is

actuated

to

improve

reception

of

signals

in

the

presence

of

high

noise

level,

such

as,

ignition

noise,

atmos-

pheric

static,

etc.

When

placed

in

the

OFF

posi-

tion,

the

receiver

resumes

its

normal

reception

of

signals.

4-6.

RF

GAIN

CONTROL

The

RF

GAIN

control

is

a

variable

resistor

in

series

with

the cathode of the

RF

tube

VlA.

In

the

extreme

counterclockwise

position,

maximum

resistance

is

introduced

into the

cathode

circuit

thus

developing

maximum

cathode

bias

to

cut

off

the

plate

current.

In

the

clockwise

position,

mini-

mum

cathode

bias

is

developed,

plate

current

in-

creases,and

RF

gain

is

maximum.

4-7.

AUDIO

GAIN

CONTROL

The

AUDIO

GAIN

control,

a

variable

resis-

tor,

regulates

the

receiver

volume.

Clockwise

rotation

increases

the

volume;

counterclockwise

rotation

decreases

the

volume.

4-8.

SELECTIVITY-BFO

CONTROL

The SELECTIVITY

-BFO

controls

the

ef-

fective

resistance

connected

between

the

IF

tube

(V3)

suppressor

and

chassis

ground.

This

control

varies

the

regeneration

capabilities

ofthe

IF

stage

up to

and

beyond

the

point

of

oscillation.

During

the

reception

of

AM

signals,

the

selectivity

ofthe

IF

stage

can

be

varied

from

approximately

8 KC

(control

fully

counterclockwise)

to

approximately

2

KC

(control

advanced to the

point

just

below

the

point

of

oscillation).

For

the

reception

of

CW

and

SSB

signals,

advance the

control

to the

point

of

oscillation

or

beyond. By

varying

the

control

beyond the

point

of

oscillation,

the

pitch

of a

CW

signal

may

be

varied

as

desired.

4-9.

MAIN

TUNING

CONTROL

The MAIN TUNING

control

is

a

variable

capacitor

which

determines

the

oscillator

fre-

quency.

It

engages

and

moves

the

pointer

on

the

slide-rule

dial

when tuning in

stations.

4-10.

CAL

RESET

CONTROL

The CAL

RESET

control

is

a

variable

capacitor

connected

in

parallel

with

the

MAIN

TUNING

capacitor

to

permit

recalibration

of

the

dial

pointer

on

each

band.

This

may

be

considered

as

an

electrical

pointer

reset.

It

is

used

primarily

in

connection

with

the

CAL-OFF

switch

when

setting

the low

frequency

limits

of

each

band

and

the 52.5

MC

point

on the 6

meter

band.

.

7.

4-11.

ANT

TRIM

CONTROL

The ANT TRIM

control

is

a

variable

capa-

citor

which

is

connected

across

the

secondary

of the

antenna

coils

as

each

coil

is

switched

into

the

circuit.

It

maintains

perfect

tracking

of

signals

on

all

frequencies

of

each

band.

4-12.

USE

OF

THE CARRIER LEVEL METER

The

carrier

level

meter

is

useful

onlywhen

the

FUNCTION

switch

is

set

in

the

AM

position

and

permits

the

operator

to

obtain

a

relative

signal

strength

indication of

the

AM

signals

received.

When the FUNCTION

switch

is

set

to

the CW-SSB

position,

the

carrier

level

meter

is

disabled

to

prevent

the

pointer

from

being

abused.

In

the

AM

position,

the

carrier

level

meter

is

very

sensitive

and

will

permit

an

excellent

visual

display

of

the

relative

strength

of the

in-

coming

signals.

4-13.

SERVICE

OR

OPERATIONS QUESTIONS

For

any

further

information

regarding

operation

or

servicing

of the

receiver,

contact

The

Hallicrafters

dealer

from

which the

receiver

was

purchased.

The

Hallicrafters

Company

maintains

an

extensive

system

of

authorized

service

centers

where

any

required

service

will

be

performed

promptly

and

efficiently

at

a

nominal

charge.

All

Hallicrafters

Authorized

Service

Centers

display

the

sign

shown below.

For

the

location

of the one

nearest

you,

consult

the

tele-

phone

directory.

commu

nlcotlonl

equipment

Do

not

make

any

service

shipments

to the

factory

unless

instructed

to do

so

by

letter.

The

Hallicrafters

Company

will

not

accept

the

respon-

sibility

for

any

unauthorized

shipments.

The

Hallicrafters

Company

reserves

the

privilege

of

making

revisions

in

current

produc-

tion of

equipment

and

assumes

no

obligation

to

incorporate

these

revisions

in

earlier

models

.

SECTION

V

RECEIVER

OPERATION

5-1.

STANDBY

Rot

ate

the

FUNCTION

contro

l to

the

STAND-

BY po

sition

. In

this

p

os

ition

,po

wer

is

app

li

ed

to

the

re

ce

iver,

as

indi

ca

ted

by

illumination

of

the

t

uning

dial,

thus

allowing

the

r

eceiver

towarm

up

prior

to

ca

libr

ation

or

normal

ope

ration

(reception

of AM, CW or SSB

si

gna

ls).

5-2.

CALIBRATION

A

specia

l

crystal

oscillator

circ

uit

(with

cr

ysta

l)

has

been

inc

or

po

r

ated

int

o

the

re

ce

iver

to

enab

le

the

o

perat

or to

accurately

ca

libr

ate

eac

h

ba

nd.

A

3.5-MC

cr y

stal

ins

erted

int

o

the

crystal

socket

(see

fig.

8)

pr

ov

id

es

a

signa

l

that

will

zero-

beat

wit

h

the

l

oca

l

osc

illator

to

pr

ov

id

e a

ca

li

bra

-

tion

marker

at

the

low

frequen

cy

edge of

the

80,

40,

20, 15 a

nd

10

meter

bands

and at

52.5

MC

on

t

he

6

meter

band

. For

ca

libr

ation

of

the

re

c

ei

ve

r

pr

eset

the

co

ntr

o

ls

as

in

di

ca

ted:

TI

CI

ANTENNA---

TRIM

C41

CAL

RESET

V2

6U8A

C42

ANT

TRIM

. . . .

...

.

..

C

en

ter

of

ran

ge

FUNCTION

...

....

...

CW

-SSB

CAL-OFF

.

...

.......

CAL

ANL-OFF

.....

OFF

RF

GAIN ...

...

..

...

Maximum

co

unt

er

-

cl

oc

kwise

AUDIO GAIN

....

. .

..

Maximum

clockwise

BAND SE

LECTOR

.

....

80

MAIN TUNING

.......

3.5

MC

SELECTIVITY

-BFO

....

Maxim

um

cl

oc

kwise

The

band

edge

ca

libr

atio

n po

ints

for

the

80,

40, 20 , 15

and

10

meter

bands

are

3.5,

7.0

,

14.0

,

21.0,

a

nd

28.0

MC

resp

ective

ly.

These

Signals

ar

e

V5

6AW8A

V4

~+----6T8

T3

MI

LMI MAIN TUNING

V3

T2

6BA6

LM2

092-01

1

237

Figure

8.

Top

View

Alignments

.

· 8 ·

Hallicrafters SX-140 Manuale di formazione

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