Lafayette HE-74 Bedienungsanleitung

Inhaltsverzeichnis

Andere Lafayette Laborausrüstung Handbücher

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VARIABLE

FREGUENCY

OSCILLATOR

OPERATING

MANUAL

TECHNICAL

SPECIFICATIONS

FREQUENCY

COVERAGE.,

FUNDAMENTAL

OSCILLATOR

FREQUENCY

....

OUTPUT

FREQUENCY

Ce

OUTPUT

POWER

......

eS

OUTPUT

IMPEDANCE.,.......

a

TUBE

COMPLEMENT

Ce

ey

Ce

Ce

3.5-

4,00

Me.

7.0-

7,30

Mc,

14.0-14,35

Mc.

21.0-21.45

Mc.

28,0-29.70

Mc,

50.0-54,00

Mc,

3.5

-4,0

Mc

for

80M

and

10M

bands,

3.5

-3.65

Me

for

40M,

20M

and

15M

bands

4,.16-4.50

Mc

for

6M

band.

80M

band:

3.5

-4.00

Mc.

40M

band:

7,0

-7,.30

Me.

20M

band:

7.0

-7.175

Me,

15M.

band:

7,0

-7,15

Me,

10M

band:

7,0

-7,425

Mc,

6M

band:

8,333-9,00

Mc,

10-30

volis

RMS

LOW

52

ohms,

HIGH

50K

ohms,

Vl

6BA6

Series-tuned

Clapp

Oscillator,

V2°6BA6

Broad-Band

Buffer-Amplifier.

V3

6AQ5

Output

Amplifier,

V4

VRI50MT/OA2

Voltage

Regulator

117

volts

50-60

cps

AC,

Height

7-3/4";

Width

8-3/4";

Depth

10",

13-1/4

lbs,

COPYRIGHT

1963

BY

LAFAYETTE

RADIO

ELECTRONICS

CORP.

Printed

in

U.S.A,

IM-360

6/63

IM/K

GENERAL

DESCRIPTION

The

HE-74

is

a

rugged

Variable

Frequency

Oscillator

designed

for

dependable,

stable

operation

on

all

bands

from

80

through

6

meters,

with

sufficient

output

to

drive

any

multi-estage"transmitter

of

modern

design,

For

high

stability,

the

VFO

employs

a

series-tuned

Clapp

oscillator,

incorporating

special

tempera-

ture-compensating

capacitors.

The

oscillator

uses

three

fundamental

tuning

ranges

to

provide

suit-

able

outputs

for

the

six

amateur

bands,

The

fundamental

tuning

ranges

are

as

follows:

(1)

3.50-4.00

Mc.

(2)

3.50-3,65

Mc,

(3)

4.16-4,50

Mc,

The

chart

below

shows

how

these

basic

tuning

ranges

are

used;:-

FUNDAMENTAL

OSCILLATOR

VFO

TUNING

OUTPUT

3,50

-

4.00

(2)

3,50

-

3.65

Mc

(2)

3,50

-

3.65

Mc

(2)

3,50

-

3.65

Mc

(1)

3.50

-4,00

Mc

(3)

4,16-4,50

Me

3,50

-4,00

Mc

(Fundamental

used)

7,00

-7,30

Me

(2nd

Harmonic

used)

7.00

-7,175

Mc

(2nd

Harmonic

used)

7,00

-7.15

Me

(2nd

Harmonic

used)

7.00

-7.425

Mc

(2nd

Harmonic

used)

8.333

-9,00

Mec

(2nd

Harmonic

used)

The

second

stage

performs

as

a

broad-band

buffer-amplifier

on

80

through

6

meters,

It

offers

good

isolation

between

the

output

and

the

oscillator

and

thus

prevents

any

frequency

shift

due

to

load

varia-

tions,

A

special

switch

position

also

permits

this

stage

to

function

as

a

crystal

oscillator

to

provide

an

output

for

calibrating

purposes,

The

output

stage

operates

as

an

amplifier

to

provide

a

high

output

signal

level

for

connection

to

the

transmitter,

The

plate

circuit

is

arranged

to

provide

optimum

tuning

to

the

fundamental

oscillator

frequency

on

80

meters

and

to

the

second

harmonic

on

40

through

6

meters

(see

table

above).

The

out-

put

terminates

in

two

coaxial

connectors

--

one

providing

a

low

impedance

output,

the

other

a

high

im-

pedance

output,

The

power

supply

uses

a

low-heat

silicon

rectifier

in

a

half-wave

circuit

with

good

filtering.

A

voltage

regulator

tube

maintains

stability

by

eliminating

any

effect

on

the

oscillator

due

to

line

voltage

variations

Rigid

mechanical

construction

has

been

employed

throughout.

Double-bearing

construction

is

used

on

the

tuning

capacitor,

All

frequency

determining

components

are

enclosed

in

a

separate

compartment

to

maintain

rigidity,

shielding,

and

provide

isolation

from

heat-producing

elements

in

the

circuit,

Although

the

HE-74

is

compatible

with

most

amateur

transmitters

having

a

VFO

input,

it

was

designed

primarily

to

match

the

LAFAYETTE

KT-390

Transmitter,

both

electrically

and

in

styling.

Any

questions

regarding

the

compatibility

of

this

VFO

with

units

which

do

not

have

a

VFO

input

should

be

directed

to

the

transmitter

manufacturer,

who

is

best

qualified

to

give

such

information.

INSTALLATION

POWER

The

VFO

operates

from

105-120

volts,

50-60

cycles

AC.

Do

not

use

on

any

other

power

source,

OUTPUT

CONNECTIONS

The

VFO

is

equipped

with

two

outputs,

One

is

a

high

impedance

output,

while

the

other

is

a

low

imped-

ance

output,

In

cases

where

it

is

necessary

to

use

a

connecting

cable

longer

than

36

inches

between

the

VFO

and

transmitter,

use

the

low

impedance

output.

For

cable

lengths

of

36

inches

or

less,

use

the

high

impedance

output,

Note,

however,

that

when

using

the

low

impedance

output,

it

will

be

necessary

to

add

a

decoupling

capacitor

of

about

2000

upyf

in

series

with

the

VFO

input

on

the

transmitter.

irordé¥

to

connect

the

VFO

to

your

transmitter,

you

will

need

coaxial

cable

and

terminating

plugs,

as

indicated

below;

RG-62/U

coaxial

cable,

PL-259

type

connector,

UG-175/U

type

adaptor,

RCA-type

phono

plug

(for

VFO

input

on

transmitter),

Instructions

for

attaching

a

coaxial

connector

to

one

end

of

coaxial

cable,

anda

phono-type

plug

to

the

other

end

(if

your

transmitter

VFO

input

has

a

phono

jack),

have

been

included

for

your

convenience,

LOCATION

Install

the

VFO

as

close

to

the

transmitter

as

possible,

Avoid

very

warm

locations

and

allow

at

least

one

inch

between

the

rear

of

the

VFO

anda

wall,

DIAL

CALIBRATIONS

The

VFO

dial

uses

six

calibrated

scales

for

tuning

on

80,

40,

20,

15,

10

and

6

meters,

The

calibration

indicate

the

RF

carrier

frequency

of

the

transmitter

Output

stage,

not

the

VFO

output,

The

table

below

shows

how

each

scale

is

calibrated:

VFO

Scale

80M

40M

20M

15M

10M

6M

Minor

Calibrations

Every

Major

Calibrations

Every

OPERATING

INSTRUCTIONS

1,

Set

the

VFO

Function

switch

to

STANDBY

and

set

the

Band

switch

to

the

desired

band

of

operation,

2,

Place

the

transmitter

in

the

Standby

position

and

allow

both

units

to

warm

up

for

30

minutes,

3,

Tune

the

VFO

to

the

desired

frequency

as

indicated

on

the

calibrated

dial,

Refer

to

the

chart

below

which

shows

the

actual

VFO

output

frequencies

for

various

dial

settings,

Also

indicated

is

the

transmitter

multiplication

necessary

in

each

case

to

produce

an

RF

carrier

output

which

matches

the

VFO

dial

tuning,

If

operation

on

14,00

Mc

were

desired,

for

example,

the

VFO

band

switch

should

be

set

to

20M

and

the

VFO

tuned

to

14,00

on

the

20M

scale,

The

output

frequency

of

the

VFO

would

actually

be

7,00

Mc,

However,

setting

the

band

switch

on

the

transmitter

to

20M

oper-

ation

will

normally

provide

a

doubling

action

and

thus

produce

a

14,00

Mc

RF

carrier

output,

CHART

MULTIPLICATION

AMATEUR

VFO

DIAL

ACTUAL

VFO

REQUIRED

BY

BAND

SCALE

OUTPUT

FREQ.

TRANSMITTER

80M

3.50-

4,00

Mc*

3,50

-4,00

Me

None

40M

7,00-

7.30

Mc

7.00

-7,30

Me

None

20M

14,00

-

14,35

Mc

7.00

-7,175

Mc

X2

15M

21,00

-

21,45

Mc*

7.00

-7.15

Mc

x3

10M

28,00

-

29,70

Mc%

7.00

-7.425

Mc

xX4

6M

50.00

-

54,00

Mc

8.333-9,00

Me

X6

*

The

VFO

calibrations

actually

extend

beyond

these

band

Limits.

However,

the

range

shown

covers

only

the

amateur

band

in

each

case.

4,

Set

the

VFO

to

SEND.

5,

Switch

the

transmitter

to

its

operating

position

and

follow

the

manufacturers

recommended

tuning

procedure,

;

VFO

CALIBRATION

The

VFO

has

been

carefully

aligned

at

the

factory

and

should

therefore

offer

accurate

calibration

at

all

dial

settings,

Remember,

however,

that

it

is

always

the

operator's

responsibility

to

guard

against

operation

outside

of

the

amateur

band

limits.

A

procedure

for

checking

and

adjusting

the

calibration

is

provided

in

the

section

headed

"VFO

CALIBRATION".

VFO

CALIBRATION

The

HE-74

was

accurately

calibrated

at

the

factory

before

shipment.

However,

with

prolonged

use

or

after

servicing,

it

may

become

necessary

to

readjust

to

VFO

for

accurate

calibration,

OUTPUT

ADJUSTMENT

1,

Connect

a

#47

pilot

lamp

across

the

LOW

output

jack

as

indicated

below,

attach

under

¥47PL

screw

head

solda

Insert

in

center

contact

of

jack

2,

Turn

the

VFO

function

switch

to

SEND,

band

switch

to

80M

and

set

tuning

pointer

to

3.50

Mc,

3,

Adjust

TC4

for

maximtim

brilliance

of

the

pilot

lamp.

See

bottom

of

VFO

fer

adjustment

points,

4,

Disconnect

the

pilot

lamp.

CALIBRATING

ADJUSTMENTS

The

calibrating

procedure

is

a

relatively

simple

one

which

can

be

carried

out

using

a

3.5

Mc

and

an

8.333

Mc

crystal,

As

an

example,

the

procedure

for

checking

calibration

on

the

80M

band

is

given

below,

)

1,

Closely

couple

the

VFO

output

to

the

receiver

antenna.

Do

not

make

a

direct

connection,

however.

All

adjustment

points

are

indicated

on

the

underside

of

the

VFO,

Make

adjustments

through

the

holes

provided,

using

a

non-metallic

alignment

tool,

2,

Insert.

a

3.50

Mc

crystal

into

the

socket

in

the

VFO,

3,

Set

the

VFO

Function

switch

to

STAND

BY

and

allow

the

VFO

and

your

receiver

to

warm

up

for

about

30

minutes.

4,

Set

the

VFO

Function

switch

to

CAL,

band

switch

to

80M,

Detune

the

VFO

--

away

from

the

crys-

tal

frequency

or

any

of

its

harmonics,

5,

Tune

the

receiver

to

the

crystal

oscillator

signal

on

3,5

Mc,

6,

Set

the

VFO

tuning

pointer

(exactly)

to

3.50.

If

VFO

tuning

is

precisely

on

frequency,

the

signals

of

the

main

VFO

oscillator

and

the

crystal

oscillator

will

produce

a

''zero

beat"

in

the

receiver.

Check

this

by

slightly

detuning

the

VFO,

If

a

"zero

beat"

is

not

obtained

when

the

VFO

pointer

is

set

exactly

to

3,50,

the

calibration

is

slightly

off

and

you

should

adjust

TCl

as

indicated

in

the

VFO

Calibration

Chart.

7,

Follow

this

same

general

procedure

on

80,

40

and

6M

bands

bration

and

make

adjustments

where

necessary,

VFO

CALIBRATION

CHART

Function

Switch

to

CAL

CAL

CAL

Band

Switch

VFO

Pointer

Set

to

Receiver

Tuned

to

3,50

Me

7,00

Me

8.333

Mc

Remarks

Adjust

for

"zero

beat''

in

receiver

*

This

adjustment

also

brings

the

10M

band

into

line.

**

This

adjustment

also

brings

the

20

and

15M

bands

into

line.

ATTACHING

COAXIAL

CONNECTOR

&

ADAPTOR

TO

COAX

CABLE

(RG-58/U,

29/U,

62/0)

en

3

*

32

COUPLING

RING

ADAPTER

1,

Cut end

of

cable

even,

Remove

vinyl

jacket

21/32''--

don't

nick

braid,

Slide

coupling

ring

and

adaptor

on

cable,

2,

Fan

braid

slightly

and

fold

back

over

cable,

3.

Compress

braid

around

cable,

Posi-

tion

adaptor

to

dimension

shown,

Press

braid

down

over

body

of

adaptor

to

dimen-~

sion

shown,

Press

braid

down

over

body

.of

adaptor

and

trim,

4,

Bare

1/2"

of

center

conductor

-~-

don't

nick

conductor,

Pre-tin

exposed

center

conductor,

SOLDER

HOLE

5,

Screw

the

plug

assembly

on

cable,

Solder

plug

assembly

to

braid

through

solder

holes,

Solder

conductor

to

con-

tact

sleeve,

Remove

1"

of

outer

insulation,

It

may

be

necessary

to

slit

the

insulation

lengthwise

to

remove,

Take

care

not

to

cut

shield

wires,

Push

the

shield

back

as

far

as

it

will

go

and

strip

off

3/4"

of

insulation

from

the

inner

conductor.

Place

phono

connector

on

cable

firmly

against

inner

insulation,

Solder

inner

conductor,

Dress

shield

up

on

base

of

connector

and

solder,

Then

trim

inner

conductor

from

tip,

(as

shown

in

the

chart)

to

check

cali-

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