MFJ Enterprises MFJ-722B Bedienungsanleitung

MEJ

Optimizer

Model

MFJ-722B

(ees

see

INSTRUCTION

MANUAL

CAUTION:

Read

All

Instructions

Before

Operating

Equipment

MFJ

ENTERPRISES,

INC.

300

Industrial

Park

Road

Starkville,

39759

USA

Tel:

662-323-5869

Fax:

662-323-6551

VERSION

2012

MFJ

ENTERPRISES,

INC.

Specifications

Notch

Frequency

Range

300-3000

Depth

High

Pass

Roll

off

below

375

per

Octave

SSB

Low

Pass

2.5

KHz,

2KHz,

1.5

KHz

Center

Frequency

aprox.

790

Width

180, 150, 110,

Audio

Output

2W,

Power

Supply

9-18VDC

MFJ-722B

INSTRUCTIONS

INTRODUCTION

The

MFJ-722B

OPTIMIZER

consists

tunable

notch

filter

combined

with

—

switch

selectable

highpass/lowpass

filter

(SSB)

and

bandpass

(CW)

filter.

This

filtering

capability

allows

you

remove

interference

from

both

SSB

and

signals

thereby

optimizing

the

desired

signal.

INSTALLATION

Connect

any

9-18

VDC,

300

power

supply

the

POWER

jack

the

rear

the

MFJ722B.

‘An

optional

adapter

(MFJ-

1312B)

available

from

MFJ

Enterprises,

Inc.

Use

2.1

Coaxial

plug

with

the

Center

positive.

VDC,

300

power

supply

required

for

maximum

audio

power

output.

Connect

ohm

speaker

the

SPEAKER

jack

connect

set

stereo

headphones

the

PHONE

jack

the

rear

the

MFJ-722B.

Connect

shielded

lead,

with

the

proper

connector,

from

the

external

speaker

headphone

jack

your

receiver

transceiver

the

INPUT

jack

the

rear

the

MFJ-722B.

The

INPUT

jack

accepts

RCA

phono

plug.

CONTROLS

ON-OFF/BYPASS

SWITCH:

When

depressed,

power

applied

the

circuit

indicated

the

front

panel

LED.

When

out,

power

removed

from

the

circuit

and

the

input

signal

switched

directly

the

SPEAKER

and

PHONE

jacks.

The

filter

circuit

bypassed.

NOTCH:

Only

the

notch

filter

the

MFJ-

722B

affects

the

signal

this

switch

position.

NOTE:

The

notch

filter

operable

all

other

SELECTIVITY

switch

positions

except

BYPASS.

NOTCH

FREQ:

Varies

the

frequency

the

notch

filter

section

from

300

3000

Hz.

NOTCH

WIDTH:

This

control

allows

adjustment

the

bandwidth

the

notch

filter

section

only.

Wide

bandwidth

tuning

easy

but

removes

larger

slice

signal.

SELECTIVITY:

SSB

MODE:

HP-

The

notch

filter

followed

highpass

filter

which

passes

all

frequencies

above

375

Hz.

Frequencies

below

375

are

rejected

the

rate

db/octave.

This

position

greatly

reduces

and

120

hum

and

other

low

frequency

noise

and

interference.

MODE:

The

center

frequency

the

filters

approximately

800

Hz.

The

signal

level

peaks

when

you

tune

the

signal

this

tone.

Low

stages

are

used

for

minimum

ringing.

180-

single

stage,

pole

active

bandpass

filter

selected

with

bandwidth

approximately

180

Hz.

This

position

useful

for

light

QRM

levels.

150-

two-stage

active

filter

selected.

This

position

useful

for

moderate

heavy

QRM

levels.

BYPASS:

All

filter

sections

the

MFJ-722

are

bypassed

and

the

signal

fed

directly

the

output

amplifier

circuit.

The

circuit

designed

2.5-

The

filter

followed

lowpass

filter

that

rejects

frequencies

above

2.5

KHz.

2.0-

The

2.5

KHz

filter

followed

another

lowpass

filter

give

cutoff

frequency

2.0

KHz.

1.5-

The

2.0

KHz

filter

followed

another

lowpass

filter

give

cutoff

frequency

1.5

KHz.

110-

The

steeper

skirts

three

active

bandpass

filter

stages

are

selected.

This

position

useful

for

moderate

heavy

QRM

levels.

80-

Four

active

filter

stages

are

selected

for

very

narrow

bandwidth

and

very

steep

skirts.

You

must

careful

tune

slowly

while

switching

this

position.

Slight

retuning

may

needed

due

drifting

your

receiver

and/or

the

transmitting

station.

This

position

useful

for

heavy

QRM

levels.

supply

signal

the

output

which

virtually

the

same

the

unfiltered

input.

GENERAL

OPERATIONS:

After

connection

described

the

INSTALLATION

section,

the

MFJ-722B

ready

for

use.

The

NOTCH

filter

the

MFJ-

722B

useful

for

removing

interfering

signals

near

the

desired

signal

such

_—as

heterodynes,

stations

tuning

your

QSO,

signals

near

frequency.

Care

should

taken

that

the

NOTCH

WIDTH

control

not

set

high

too

low.

set

too

low,

the

bandwidth

large

the

notch

filter

—_

appears

inoperable.

set

too

high,

the

bandwidth

narrow

that

the

NOTCH

tuning

very

critical

and

the

notch

frequency

hard

locate.

Set

the

SELECTIVITY

switch

the

NOTCH

position.

After

tuning

the

desired

signal

your

receiver,

adjust

the

NOTCH

FREQ

control

attenuate

unwanted

signals

near

the

tuned

signal.

The

SSB

positions

the

SELECTIVITY

switch

optimizes

the

desired

signal

attenuating

unwanted

high

or_~——

low

frequencies.

the

position,

frequencies

below

approximately

375

are

attenuated

reducing

interference

such

and

120

hum.

the

2.5,

2.0,

and

1.5

position,

lowpass

filter

activated

addition

the

highpass

filter.

The

range

frequencies

passed

the

speaker

headphones

progressively

narrower

the

switch

changed

from

2.5

2.0

1.5.

Only

those

frequencies

above

the

cutoff

frequency

375

and

below

the

selected

lowpass

cutoff

frequency

are

passed.

the

positions

SELECTIVITY

switch,

the

bandpass

filters

switchable

bandwidth

are

activated.

The

bandwidth

set

the

SELECTIVITY

switch

either

180

Hz,

150

Hz,

110

Hz,

Hz.

the

position,

the

selectivity

great

that

you

may

notice

"talking

barrel"

slight

ringing

effect.

This

normal

for

this

position.

NOTE:

aware

that

the

notch

filter

operable

all

SELECTIVITY

switch

settings

except

BYPASS.

you

not

desire

the

notch

function

while

using

the

SSB

switch

positions,

rotate

the

NOTCH

FREQ

control

fully

clockwise

minimize

the

notch

filter

effect.

FULL

12-MONTH

WARRANTY

MFI

Enterprises,

Inc.

warrants

the

original

owner

this

product,

manufactured

MFI

Enterprises,

Inc.

and

purchased

from

authorized

dealer

directly

from

MEI

Enterprises,

Inc.

free

from

defects

material

and

workmanship

for

period

months

from

date

purchase provided

the

following

terms

this

warranty

are

satisfied,

The

purchaser

must

retain

the

dated

proof-of-purchase

(bill

sale,

canceled

check,

credit

card

money

order

receipt,

etc.)

describing

the

product

establish

the

validity

the

warranty

claim

and

submit

the

original

machine

reproduction

such

proof

purchase

MEI

Enterprises,

Inc.

the

time

warranty

service.

MFI

Enterprises,

Inc.

shall

have

the

discretion

deny

warranty

without

dated

proof-of-purchase.

Any

evidence

alteration,

erasure,

forgery

shall

cause

void

any

and

all

warranty

terms

immediately

MFI

Enterprises,

Inc.

agrees

repair

replace

MFJ's

option

without

charge

the

original

owner

any

defective

product

provided

the

product

returned

postage

prepaid

MFI

Enterprises,

Inc.

with

personal

check,

cashiers

check,

money

order

for

$12.00

covering

postage

and

handling.

MFI

Enterprises,

Inc.

will

supply

replacement

parts

free

charge

for

any

MFI

product

under

warranty

upon

request.

dated

proof

purchase

and

$8.00

personal

check,

cashiers

check,

money

order

must

provided

cover

postage

and

handling.

‘This

warranty

NOT

void

for

owners

who

attempt

repair

defective

units

Technical

consultation

available

calling

(662)

323-5869.

‘This

warranty

does

not

apply

kits

sold

manufactured

MFJ

Enterprises,

Ine.

Wired

and

tested

board

products

are

covered

this

warranty

provided

only

the

wired

and

tested

board

product

returned.

Wired

and

tested

boards

installed

the

owner's

cabinet

connected

switches,

jacks,

cables,

etc.

sent

MFJ

Enterprises,

Inc.

will

returned

the

owner's

expense

un-repaired.

Under

circumstances

MFI

Enterprises,

Inc.

liable

for

consequential

damages

person

property

the

use

any

MFJ

products.

Out-of-Warranty

Service:

MFJ

Enterprises,

Inc.

will

repair

any

out-of-warranty

product

provided

the

unit

shipped

prepaid.

All

repaired

units

will

shipped

COD

the

owner.

Repair

charges

will

added

the

COD

fee

unless

other

arrangements

are

made.

This

warranty

given

licu

any

other

warranty

expressed

implied

10,

MFI

Enterprises,

Inc.

reserves

the

right

make

changes

improvements

design

manufacture

without

incurring

any

obligation

install

such

changes

upon

any

the

products

previously

manufactured

All

MFS

products

serviced

in-warranty

out-of-warranty

should

addressed

MFJ

Enterprises,

Inc.,

300

Industrial

Park Rd,

Starkville,

Mississippi

39759,

USA

and

must

accompanied

letter

describing

the

problem

detail

along

with

copy

your

dated

proof-of-purchase

and

telephone

number.

This

warranty

gives

you

specific

rights,

and

you

may

also

have

other

rights,

which

vary

from

state

Rev

04/08/2011

MFJ

ENTERPRISES,

INC.

473-7225

Manual

300

Industrial

Park

Road

Version

Starkville,

39759

Printed

U.S.A.

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