MFJ MFJ-201 Bedienungsanleitung

ITF]

1.5-250

MHz

DIP

METER

Model

MFJ-201

Operation

Manual

GENERAL

This

unit

transistorized:dip

meter

for

rapidly

checking

circuits

and

components

receivers,

transmitters,

antennas,

etc.;

in:

the

1.5

250MHz

range.

designed

for

many

applications

Amateur

Radio

stations

and-service:shops.

SPECIFICATIONS

‘

Frequency

Range

1.5

250MHz

with

six

plugin

coils:

Band

Range

1.5-—

4MHz

3.3-

8MHz

6.8—

18MHz

18—

47MHz

—

110MHz

100

—

250MHz

Modulation

Approx.

2kHz;

sine

wave

Crystal

Oscillator

1-15MHz,

crystal

FT-243

holder

Power

Supply

volt

battery

Current

Consumption

2mA,

maximum

Semiconductor

Complement

transistors

and

diode

PANEL

CONTROLS

Frequency

dial

Six

frequency

scales

calibrate

according

bands

and

color

the

coil

use.

Meter

For

indicating

resonance

and

for

battery

check.

Function

switch

Three

positions

OSC:

For

use

dip

meter

absorption

wave-

meter.

MOD

Applies

2kHz

the

carrier

output.

BATT

For

checking

condition

CHECK

internal

battery.

SENSITIVITY

Adjusts

the

output

level

the

oscillator;

OFF,

the

power

supply

cut

off

and

the

instrument

can

used

absorption

wavemeter.

Earphone

jack

For

monitoring

signals

with

crystal

earphone

(not

supplied).

CIRCUIT

DESCRIPTION

The

oscillator

Colpitts

type

using

silicon

transistor.

The

voltage

rectified

with

diode

and

the

current

indicated

the

meter.

When

the

dip

meter

frequency

resonance

with

the

external

circuit,

the

meter

pointer

will

dip.

The

strength

the

oscillator

output

controlled

with

the

SENSITIVITY

adjuster.

When

required,

amplitude

modulation

can

applied

the

oscillator

output.

twin-

type

circuit

used

for

the

2kHz

source.

the

absorption

wavemeter

function,

the

oscillator

Power

cut

off

and

the

tuned

and

diode-meter

circuits

are

used.

PRECAUTIONS

OPERATION

During

standby

periods

when

the

dip

meter

not

use,

set

SENSITIVITY

adjuster

OFF

(clicked).

This

will

Prolong

battery

life.

Handle

the

coils

carefully

when

inserting

removing

same

from

the

socket.

During

measurements,

the

coil

should

loosely

coupled

the

test

circuit.

The

coupling

must

loose

possible

obtain

proper

meter

indication.

coupling

will

in-

troduce

errors

measurement.

IMPORTANT!

When

checking

transmitting

equipment,

coupling

will

damage

the

diode

detector

overload.

Disconnect

the

battery

from

the

internal

circuit

when

the

dip

meter

not

use

for

long

periods.

OPERATION

Battery

Check

and

Replacement

Set

FUNCTION

BATT

CHECK.

Advance

SENSITIVITY

power

on.

The

meter

pointer

should

swing

the

BATT

portion

the

scale.

not,

renew

the

battery.

NOTE:

install

replace the

battery,

remove

the

covers

follows:

Remove

the

two

screws

each

the

right

and

left

sides

the

instrument;

take

off

the

covers.

Loosen

the

battery

clamp

screw

center

the

chassis

and

take

out

the

battery.

Remove

the

snap

terminals

from

the

battery.

install;

reverse

steps.

Tighten

the

clamp

screw

and

put

the

side

covers.

After

this

check,

set

SENSITIVITY

OFF.

Use

Dip

Meter

Plug

the

coil

for

the

band

use

the

socket.

Set

FUNCTION

OSC.

Advance

SENSITIVITY

past

the

click

point

that

the

meter

pointer

swings

about

0.8.

NOTE:

When

the

“F”

coil

used,

there

will

some

variation

the

meter

deflection

the

frequency

dial

rotated.

This

effect

will

present

when

the

coil

not

coupled

the

test

circuit.

Care

must

taken

during

use

not

confuse

this

condition

with

the

actual

dip

caused

the

test

circuit.

Couple

the

coil

loosely

the

test

circuit

and

rotate

the

frequency

dial

small

steps

until

dip

observed

the

meter.

(When

there

are

two

dips

together,

place

the

coil

farther

from

the

test

circuit.)

Adjust

the

frequency

dial

until

the

maximum

dip

obtained.

Note

the

frequency

the

frequency

dial.

Set

SENSITIVITY

OFF

after

the

tests.

Examples

typical

coupling

methods

are

shown

Fig.

NOTE:

important

that

the

power,

applied,

the

test

circuit

turned

off,

aby

see

enon

Fig.

—1

Dip

meter

coupling

methods.

AandB_:

Director

link

types.

For

shielded

circuits;

the

coupling

capacitor

should

small

possible.

D_:

Determination

resonant

frequency

antenna;

use

1-turn

coil

the

antenna.

(For

vertically

grounded

antennas,

not

forget

make

the

ground

connection.)

Determination

electrical

length

quarer-wave

and

half-wave

coaxial

feeders.

Use

Absorption

Wavemeter

When

the

coil

coupled

the

coil

oscillator,

tank

coil

transmitter,

the

Plug

the

coil

for

the

band

use

the

socket.

Set

SENSITIVITY

OFF.

Set

FUNCTION

OSC.

meter

pointer

will

swing

upward

when

tuned

resonance.

The

amount

the

swing

depends

the

strength

the

oscillations

and/or

coupling

distance.

NOTE:

checking

transmitters,

take

care

that

the

energy

picked

will

not

overload

the

instrument,

otherwise

the

diode

detector

will

damaged.

Further,

not

touch

any

the

high

voltage

points

within

the

transmitter;

safety

important.

Read

the

frequency.

Typical

application

are

shown

Fig.

—2

Absorption

wafemeter

applications.

Measurement

oscillator

frequency.

Measurement

frequency

the

transmitter

output.

check

for

harmonics

parasitics,

slowly

rotate

the

frequency

dial

for

the

indications;

change

the

coils

are

necessary.

The

meter

deflection

will

indicate

the

relative

strength

these

signals.

Neutralizing

adjustments

can

made

first

cutting

off

supply

the

plate

and

screen

grid

circuits.

The

tank

circuit

then

tuned

for

maximum

indication.

the

neutralizing

capacitor,

CN,

adjusted

for

minimum

indication.

Use

field

strength

meter

shown.

short

antenna

coupled

the

coil

for

signal

pickup.

When

the

wavemeter

tuned

the

operating

frequency

and

different

positions

around

the

antenna,

the

relative

field

strength

will

indicated

the

meter.

Short

Wave

Receiver

Testing

this

application,

the

dip

meter

used

simple

test

oscillator,

with

without

amplitude

modulation.

The

test

frequency

set

with

the

suitable

coil

and

frequency

dial.

The

dip

meter

placed

near

the

receiver;

the

“input

signal

strength”

can

varied

with

the

distance

between

the

dip

meter

and

the

receiver.

For

operation,

set

SENSITIVITY

for

output.

Communications

receivers

with

best

oscillators

can

tested

setting

FUNCTION

OSC

for

the

signal.

When

signal

required,

set

FUNCTION

MOD.

tone

approximately

2kHz

will

heard

the

loudspeaker.

Adjustments,

required,

can

made,

with

the

respective

signals,

the

receiver

circuits,

Monitoring

Phone

Signals

The

wavemeter

application,

see

Sect.

5.3,

can

used

for

monitoring

phone

signals.

crystal

earphone

connected

the

earphone

plug

and

the

plug

inserted

the

PHONE

jack.

Tune

the

test

frequency

using

the

proper

coil.

For

“remote”

indication

the

modulated

output,

the

meter

can

connected

the

ear-

phone

plug;

the

inner

contact

the

side.

Use

Crystal

Oscillator

place

the

coil,

quartz

crystal,

—

15Mhz,

the

FT-243

holder,

inserted

the

socket

will

produce

output

the

crystal

frequency.

Set

FUNCTION

OSC

and

SENSITIVITY

required

for

the

output.

The

frequency

dial

rotated

until

the

most

stable

condition

obtained.

Set

the

dip

meter

near

the

receiver

for

signal

pickup.

For

modulated

output,

set

FUNCTION

MOD.

Audio

Signal

Output

Set

the

instrument

for

dip

meter

operation,

see

Sect.

with

coil

the

socket

(However,

the

not

used.)

Set

FUNCTION

MOD.

Audio

output

approximately

2kHz

available

the

PHONE

jack.

The

plug

connections

are

follows:

Inner

contact

for

the

“hot”

side

and

the

sleeve

for

ground.

This

signal

can

used

for

checking

audio

circuits.

Inductance

and

Capacitance

Measurements

Unknown

inductances

and

capacitances

can

determined

with

use

the

dip

meter,

see

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