Mfj Mfj-802b User manual

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ME)

Field

Strength

Meter

Model

MFJ-802B

INSTRUCTION

MANUAL

CAUTION:

Read

All

Instructions

Before

Operating

Equipment

MFJ

ENTERPRISES,

INC.

300

Industrial

Park

Road

Starkville,

MS

39759

USA

Tel:

662-323-5869

Fax:

662-323-6551

COPYRIGHT

@

1099

MFJ

ENTERPRISES,

INC.

MFJ-802B

Instruction

Manual

INTRODUCTION

Thank

you

for

purchasing

the

MFJ-802B.

A

field-strength

meter

(or

FSM)

is

one

of

the

most

practical

pieces

of

ham

test

equipment

you

can

own,

and

the

MFJ-802B

has

some

special

features

we

think

you'll

like,

For

example,

it

has

a

huge

high-resolution

meter

with

a

robust

0-

100

scale

that's

easy

to

read

from

several

feet

away.

It

also

combines

a

balanced

pick-up

antenna

with

a

RF-insulated

enclosure

to

eliminate

hand-capacitance

errors

typical

of

older-style

meters.

There's

a

high-Z

balanced

decoupling

network

that

ensures

top

efficiency

over

a

wide

frequency

range

and

provides

complete

isolation

between

the

detector

and

metering

circuits.

And,

there's.a

uA-type

meter

movement

with

a

wide-range

sensitivity

control

to

handle

signals

from

the

milliwatt

to

kilowatt

level.

Add

the

MFJ-802R

remote

pickup,

and

you

can

monitor

field

strength

from

anywhere

you

wish

in

the

comfort

of

your

shack.

Inexpensive

low-voltage

de

wire

connect

the

two

units

together.

Like

most

field-strength

meters,

the

MFJ-802B

is

extremely

simple

to

operate.

However,

as

with

any

piece

of

RF

test

equipment,

it

has

limitations

you

should

know

about--and

we

urge

you

to

read

the

manual

carefully

before

using

it.

YOUR

METER'S

CONTROLS

=

Remote

Sensitivity

O-5

.

MFJ-802

FSM

1.

Collapsible

Dipole:

Balanced

pickup

element

extend

to

38"

(1/2-

wave

on

2-meters).

Adjust

for

resonance

at

VHF/UHF

frequencies,

or

extend

fully

and

use

as

a

non-resonant

dipole

at

HF.

The

antenna

is

RF-decoupled

from

metering

circuitry,

and

a

dipole

pattern

will

be

maintained

at

non-resonant

frequencies.

UU

EEUU

NEES

EIEIEIISEIEIEEEE

MF/J-802B

Instruction

Manual

2,

Easy-to-Read

Meter

Scale:

Bold

0-100

scale

is

readable

for

several

feet--may

be

set

up

at

any

convenient

location

near

your

operating

site.

High-quality

meter

movement

resolves

even

small

changes

in

the

RF

field.

3.

Remote

Detector

Jack:

Standard

phone

jack

accepts

monaural

1/4"

plug

when

MFJ-802R

remote

detector

is

used.

4,

Wide-Range

Sensitivity

Control:

Adjusts

your

meter

for

a

wide

range

of

power

levels

and

distances

to

the

RF

source.

To

prevent

damage,

always

begin

measurements

with

the

sensitivity

control

set

at

minimum

(fully

counter

clockwise).

USING

YOUR

METER

The

MFJ-802B

is

useful

anywhere

a

hand-held

or

stationary

field-

strength

meter

is

needed.

For

example,

it's

perfect

for

resonating

critical

HF

mobile

antennas,

adjusting

tuning

networks,

optimizing

antenna

arrays

for

highest

ERP,

and

tuning

transmitter

circuitry

for

maximum

output.

Remember

to

exercise

caution

when

working

near

guises

antennas.

and

permanent

injury.

Here

are

some

specific

tips

to

help

you

get

the

most

from

your

meter:

1.

To

avoid

violently

pinning

the

meter,

always

begin

field-strength

measurements

with

the

sensitivity

control

turned

fully

down

(or

counter-clockwise).

Also,

it's

a

good

practice

to

store

your

meter

with

the

sensitivity

set

to

minimum.

2.

For

best

meter

resolution,

set

the

meter's

sensitivity

control

to

yield

mid-range

readings.

3.

Orient

the

meter's

pick-up

dipole

to

the

same

polarization

as

your

antenna

under

test.

4.

At

VHF/UHF

frequencies,

maintain

a

minimum

of

2-3

wavelengths

spacing

between

the

pick-up

antenna

and

any

antenna

under

test.

Closer

proximity

could

easily

damage

the

meter's

diode

detector,

and

may

detune

the

test

antenna

you're

attempting

to

adjust.

MFJ-802B

Instruction

Manual

5.

Try

to

keep

test

antennas--and

your

meter's

pick-up

antenna--well

separated

from

nearby

cables,

masts,

or

other

metallic

structures

that

could

act

as

a

parasitic

element

and

effect

your

results.

may

result:

REMOTE

PICKUP

(MFJ-802R)

The

MFJ-802R

is

an

optional

antenna/detector

unit

that

is

identical

to

your

MFJ-802B--minus

the

meter

and

sensitivity

control.

The

MFJ-

802R

can

be

plugged

into

your

primary

meter

and

located

remotely

to

provide

optimum

monitoring

positioning.

For

example,

to

obtain

station

antenna

measurements

uncolored

by

household

wiring

and

RF

leakage,

install

the

MFJ-802R

remote

outside

of

the

building

and

connect

it

to

your

MFJ-802B

in

the

ham

shack.

Or,

for

accurate-

antenna

range

measurements,

install

the

MFJ-802R

remote

several

wavelengths

down-range

and

locate

the

MFJ-802B

meter

at

your

antenna

test

site.

The

MFJ-802B

meter

and

remote

pickup

require

only

low-cost

2-conductor

dc

wire

for

interconnection.

The

remote

pickup

is

a

great

way

to

increase

the

versatility

and

usefulness

of

your

MFJ-802B.

THEORY

OF

OPERATION

The

MFJ-802B

Field-Strength

Meter

uses

a

dipole

sense

antenna

with

a

diode

bridge

connected

across

its

feedpoint.

The

diode

bridge

passes

dc-detector

voltage

to

sensitivity

control

R1,

while

blocking

RF

and

isolating

the

antenna

from

common-mode

pickup.

R1

is

an

adjustable

voltage

divider

that

controls

the

detector

output

level

applied

to

meter

Ml. The

remote

detector

is

identical

to

the

MFJ-802B,

minus

the

sensitivity

contro]

and

meter.

ead

EEE

aaa

MFJ-802B

Instruction

Manual

IN

CASE

OF

DIFFICULTY

Your

meter

has

no

internal

adjustments

and

represents

a

trouble-free

design.

However,

it

has

a

sensitive

electro-mechanical

meter

that

may

sustain

damage

if

dropped.

Also,

the

MFJ-802B

is

not

weatherproof,

and

should

not

be

exposed

to

heavy

rain,

snow,

or

other

harsh

environmental

conditions

TECHNICAL

ASSISTANCE

If

you

have

any

problem

with

this

unit

first

check

the

appropriate

section

of

this

manual.

If

the

manual

does

not

reference

your

problem

or

your

problem

is

not

solved

by

reading

the

manual

you

may

call

MFI

Technical

Service

at

662-323-0549

or

the

MFJ

Factory

at

662-323-

5869,

You

will

be

best

helped

if

you

have your

unit,

manual

and

all

information

on

your

station

handy

so

you

can

answer

any

questions

the

technicians

may

ask.

You

can

also

send

questions

by

mail

to

MFJ

Enterprises,

Inc.,

300

Industrial

Park

Road,

Starkville,

MS

39759;

by

Fax

to

662-323-6551,

or

by

email

to

[email protected].

Send

a

complete

description

of

your

problem,

an

explanation

of

exactly

how

you

are

using

your

unit,

and

a

complete

description

of

your

station.

MEFJ-802B

Instruction

Manual

SCHEMATIC

UNLESS

OTHERMISE

SPECIFIED

|

|

iy

i

;

FIELD

STRENGTH

METER

LIMITED

12

MONTH

WARRANTY

MF

Enterprises,

Inc.

warrants

to

the original

owner

of

this

product,

if

manufactured

by

MF]

Enterprises,

Inc.

and

purchased

from

an

authorized

dealer

or

directly

from

MFJ

Enterprises,

Inc.

to

be

free

from

defects

in

material

and

workmanship

for

a

period

of

12

months

from

date

of

purchase

provided

the

following

terms

of

this

warranty

are

satisfied:

1,

10.

1.

The

purchaser

must

retain

the

dated

proof-of-purchase

(bill

of

sale,

canceled

check,

credit

card

or

money

order

receipt,

etc.)

describing

the

product

to

establish

the

validity

of

the

warranty

claim

and

submit

the

original

or

machine

reproduction

of

such

proof

of

purchase

to

MFJ

Enterprises,

Inc.

at

the

time

of

warranty

service.

MFJ

Enterprises,

Inc.

shall

have

the

discretion

to

deny

warranty

without

dated

proof-of-purchase.

Any

evidence

of

alteration,

erasure,

or

forgery

shal]

be

cause

to

void

any

and

all

warranty

terms

immediately.

.

MFYJ

Enterprises,

Inc.

agrees

to

repair

or

replace

at

MFJ's

option

without

charge

to

the

original

owner

any

defective

product

under

warrantee

provided

the

product

is

returned

postage

prepaid

to

MFJ

Enterprises,

Inc.

with

a

personal

check,

cashiers

check,

or

money

order

for

$7.00

covering

postage

and

handling.

This

warranty

is

NOT

void

for

owners

who

attempt

to

repair

defective

units.

Technical

consultation

is

available

by

calling

Service

Department

at

662-323-0549

or

the

MFJ

Factory

at

662-323-5869.

This

warranty

does

not

apply

to

kits

sold

by

or

manufactured

by

MFJ

Enterprises,

Inc.

Wired

and

tested

PC

board

products

are

covered

by

this

warranty

provided

only

the

wired

and

tested

PC

board

product

is

retumed.

Wired

and

tested

PC

boards

installed

in

the

owner's

cabinet

or

connected

to

switches,

jacks,

or

cables,

etc.

sent

to

MFJ

Enterprises,

Inc.

will

be

retuned

at

the

owner's

expense

unrepaired.

Under

no

circumstances

is

MFJ

Enterprises,

Inc.

liable

for

consequential

damages

to

person

or

property

by

the

use

of

any

MFJ

products.

Out-of-Warranty

Service:

MFJ

Enterprises,

Inc.

will

repair

any

out-of-warranty

product

provided

the

unit

is

shipped

prepaid.

All

repaired

units

will

be

shipped

COD

to

the

owner.

Repair

charges

will

be

added

to

the

COD

fee

unless

other

arrangements

are

made.

This

warranty

is

given

in

lieu

of

any

other

warranty

expressed

or

implied.

MF]

Enterprises,

Inc.

reserves

the

right

to

make

changes

or

improvements

in

design

or

manufacture

without

incurring

any

obligation

to

install

such

changes

upon

any

of

the

products

previously

manufactured.

All

MFJ

products

to

be

serviced

in-warranty

or

out-of-warranty

should

be

addressed

to:

MEJ

Enterprises,

Inc.

300

Industrial

Park

Road

Starkville,

Mississippi

39759

USA

and

must

be

accompanied

by

a

letter

describing

the

problem

in

detail

along

with

a

copy

of

your

dated

proof-of-purchase.

This

warranty

gives

you

specific

rights,

and

you

may

also

have

other

rights

which

vary

from

state

to

state.