Mfj Mfj-949c User manual

Table of contents

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/Z-—

21-88

MFJ-949C

VERSA

TUNER

II

MODEL

MFJ-949C

OWNER’S

MANUAL

CAUTION:

Read

All

Instructions

Before

Operating

Equipment.

MFJ

ENTERPRISES,

INC.

P.

O.

BOX

494,

MISSISSIPPI

STATE,

MS.

39762,

USA

(-\

BO,

RPRISES,

INC

RRR

ALLY

RIES

TM

5

i

J

MFJ-949C_

DELUXE

VERSA

TUNER

II

INSTRUCTIONS

GENERAL

INFORMATION

e@

The

MFJ-949C

is

designed

to

match

virtually

any

transmitter

to

al-

most

any

antenna,

including

dipoles,

inverted

vees,

verticals,

mobile

whips,

beams,

random

wires,

and

others

fed

by

coax

lines,

balanced

lines,

or

a

single

wire.

A

1:4

balun

is

built

in

for

connection

to

balanced

lines.

An

sSntenna

selector

switch

provides

versatile

antenna

selection.

A

50

ohm

dummy

load

is

built

in

for

easy

transmitter

tuning.

The

MFJ-949C

will

handle

up

to

300

watts

of

RF

output

power

from

the

transmitter

from

160

through

10

meters.

The

MFJ-949C

employs

a

cross

needle

meter

so

forward

power,

reflected

power,

and

SWR

can

be

read

simultaneously.

THE

SWR/WATTMETER

The

meter

on

the

MFJ-949C

can

be

used

with

the

tuner

or

by

it-

self.

To

use

the

meter

without

the

tuner,

set

the

ANTENNA

SELECTOR

to

Coax

1

Direct

or

Coax

2:

Direct.

The

MFJ-949C

utlilizeswamc

losses

meter

so

FORWARD

power,

REFLECTED

power,

and

SWR

can

pie

multane-

ously.

The

range

for

both

FORWARD

and

REFLECTED

power

is

either

30

watts

or

300

watts.

<it

willl

read

SWR

of

2

1sto

>:

To

read

transmitter

RF

output

power,

set

the

desired

range

of

either

30

watts

or

300

watts.

Transmit

a

steady

carrier

and

read

the

FORWARD

power

on

the

FORWARD

scale

and

the

REFLECTED

power

on

the

REFLECTED

scale.

SWR

is

indicated

by

the

crossing

point

of

the

two

needles.

While

transmitting,

read

SWR

from

the,SWR

line

nearest

the

crossing

&

point.

The»

meter-lamp

can

be

power,

by

a

12V

DC

source.

Use

a)255mm

plug

with

the

tip

of

the

plug

connected

to

the

positive.

The

ANTENNA

SELECTOR

switch

alows

selecting

two

coax

antennas

either

direct/of

through

the

tuner,

a

balanced

line

atnenna

or

wire

antenna

or

a

built-in

50

ohm

dummy

load.

The

50

ohm

dummy

load

is

rated

at

300

watts.

CAUTION:

DO

NOT

continously

key

for

more

than

2

minutes

at

a

time.

DO

NOT

operate

the

antenna

switch

while

trans-

mitting.

DO

NOT

use

the

MFJ-949C

for

over

300

watts

of

RF

output

power,

even

in

the

Direct

Coax

or

Dummy

Load

positions.

INSTALLATION

Ie.

Install

the

MFJ-949C

between

the

transmitter

and

the

antennas.

A

coax

line

is

connected

to

the

transmitter

andthe

50-27

>

7coax

connector

marked

TRANSMITTER

on

the

tuner.

I4e

One

or

two

coax

fed

antenna

may

be

connected

to

the

SO-239

EVakeCOnneet

Ot

SemMaGKxeds

COaxs

@andsGoaxne

.SyiNOTE:97

Coax

7

and

Coax

2

antennas

can

be

connected

directly

to

the

transmitter,

amd

by-passing

the

tuner

by

setting

ANT.

Sel-

ector

to

Coax,

13

Diréct

orWCoax

2;

Direct,

respectively.

Sc.

A

random

wire

antenna

may

be

connected

to

the

five-way

binding

post

marked

WIRE.

The

random

wire

should

be

long,

high,

and

as

clear

of

surrounding

objects

as

possible.

For

optimum

operation,

length

of

random

wire

antenna

sho-

Pideoey

judrter

wave,

Ore

longex’

Ofethes

operating,

frequency.

Do

not

ground

the

random

wire

antenna.

Make

sure

that

the

tuner

is

well

grounded

to

the

transmitter.

A

£ive-

way

binding

post

marked

GROUND

is

provided

for

ground

connection.

4.

A

balanced

line

fed

antenna

may

be

connected

to

the

two

five-way

binding

posts

marked

BALANCED

LINE.

A

jumper

wire

from

the

WIRE

binding

post,

as

indicated

by

a

dotted

line

on

the

MFJ-949C,

should

be

connected

to

one

of

the

postS

of

the

BALANCED

LINE.

This

couples

the

MFJ-949C

to

mene

bavanced=-Line

through:

“asls4

balun.

NOTE:

Either

a

balanced

line

or

random

wire

antenna

can

be

connected

at

one

time.

If

a

random

wire

antenna

is

used,

make

sure

that

there

is

not

a

jumper

wire

between

WIRE

and

BALANCED

LINE.

USING

ELHE,

ME

=949C

The

INDUCTOR

switch

on

the

MFJ-949C

represents

a

minim-

um

Of

inductance

at

positionA

and

a

maximum

of

inductance

at

position

bo

Less

inductance

is

needed

at

high

frequencies

than

at

low

frequencies

for

the

same

impedgnce.

The

TRANS-

MITTER

and

ANTENNA

controls

both

represent

a

maximum

of

cap-

fetcance

at

position

6.

For

optimum

operation

of

the

MFJ-949C,

BeaecmeLaisiitter

must

be

Luned

for

a

50

ohm

output

impedénce

POLetnewrrequency

band

in

Operation.

Set

ANT.

SELECTOR

switch

BomvUMNnyeuOdC

LOG

Luning

up

the

transmitter.

NOTE:

Always

tune

the

transmitter

at

a

low

output

power.

Pape

te

puOpecmlyecuning

Lhe

transmitter,

set

Antenna

Selector

to

the

desired

antenna

and

tune

the

tuner

for

a

minimum

SWR

as

descitbed

below.

DO

NOT

readjust

the

trans-

Names

Get

OadCdanGgecOnLr1Ol

Setting

aiter

loading

it

to

the

50

ohm

load.

de

Seueunew

RANSMELIER

and

ANTENNA

controls

to

3.5

(The

Sapdeteorewate

sical)!

-Opened

)’.

2

Rotate

the

INDUCTOR

control

until

maximum

noise

is

ob-

Tainead

With

your

transceiver

in

the

receiving

mode.

ShA

Witeremeransttt

tind

and

wath

the

INDUCTOR

control

set

the

same

as

for

step

2,

alternately

adjust

the

TRANSMITTER

and

ANTENNA

controls

for

a

minimum

SWR.

Since

the

TRANS-

-MITTER

and

ANTENNA

controls

interact,

the

two

controls

can

best

be

adjusted

by

turning

the

TRANSMITTER

control

a

small

increment

at

a

time

and

the

rotating

the

ANTENNA

control

for

the

minimum

SWR.

Repeat

this

until

a

minimum

SWR

is

obtained.

If

a

SWR

reading

of

1:1

is

not

achieved,

increase

or

de-

crease

the

INDUCTOR

control

or

position

and

repeat

Step

32°

CAUTION:

“If”

arcing”

betweenscapaci

tor

spdates

occunss

increase

or

decrease

the

INDUCTOR

control

one

position

and

repeat’

Step

3.

“NOTE:

If

a

SWR

1:1

cannot

be

achieved

at

this

point,

repeat

Step

3

for

each

INDUCTOR

control

position.

Again,

-do

this

in

the

tune

mode

or,

at.a.low

transmitter

power.

After

a

minimum

SWR

is

achieved,

the

transmitter

power

may

now

be.

increased’

up

to

300-watts.

@Thisstiuner

wile

reduce

the

SWR

of;

most

-antenna

Systems:

to

nearlyeises.

However

in

some

cases

a

1:1

SWR

may

not

be

achievable.

If

this

happens,

try

increasing

or

decreasing

length

of

antenna.

Note

that

a

1.5:1

SWR

results

only

in

4%

re-

flected

power

and

11%

reflected

power

with

a

SWR

of

2:1.

A

SWR

of

1:1

can

occur

from

more

than

one

=

seteon,

contnon

settings

on

the

MFJ-949C.

When

a

SWR

of

1:1

is

obtained,

be

sure

to

check

the

transmitter

power

and

make

sure

that

the

transmitter

power

is

relatively

high.

If

the

trans-

mitter

power

has

decreased

substantially,

try

another

INDUCTOR

control

setting

and

repeat

Step

3.

When

using

the

MFJ-949C

for

receiving

only,

tune

the

MFJ-949C

as

described

in

Step

1

and

Step2.

4dntO

dnLO’

WYYOVIC

LINOdLO

O676-CAN

GNIOUD

ANIT

GHONVIVE

uytm

dedunl

ospy

ax

I'T

CaONVIVE

YALLINSNVaL

Mili

AAiiclcb

oleh

ida

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CeCe

Qi

lel

FULL

12

MONTHS

WARRANTY

MFJ

Enterprises,

Inc.

warrants

to

the

original

owner

of

this

product,

if

manufactured

by

MFJ

Enterprises,

Inc.

and

purchased

from

an

authorized

dealer

or

directly

from

N‘FJ

Enterprises,

Inc.

to

be

free

of

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.

The

purchaser

must

retain

the

dated

proof-of-purchase

(bill

of

sale,

cancelled

check,

credit

card

or

money

order

receipt,

etc.)

describing

the

product

to

establish

the

va-

lidity

of

warranty

claim

and

must

submit

the

original

or

a

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

of

proof-of-purchase

——

ye

NS

la

%

yy)

PP

PPPPyyY

|

babidilidededededehele

ee

shall

be

cause

to

void

any

and

all

warranty

terms

immediately.

——

_o

2.

MFJ

Enterprises,

Inc.

agrees

to

repair

or

replace

at

MFJ’s

option

without

charge

to

—

=

the

original

owner

any

defective

product

provided

the

product

is

returned

postage

‘(<5

prepaid

to

MFJ

Enterprises,

Inc.

with

a

personal

check,

cashier’s

check

or

money

ae

a.

order

for

$4.00

covering

postage

and

handling.

7

Ss

3.

MFJ

Enterprises,

Inc.

will

supply

replacement

parts

free

of

charge

for

any

MFJ

pro-

<=

duct

under

warranty

upon

request.

A

dated

proof-of-purchase

and

a

$4.00

personal

»<=

>

check,

cashier’s

check

or

money

order

must

be

provided

to

cover

postage

and

—

handling.

——

=

4.

This

warranty

is

NOT

void

for

owners

who

attempt

to

repair

defective

units.

Techni-

—

=

cal

consultation

is

available

by

calling

(601)

323-5869.

—

5.

This

warranty

does

not

apply

to

kits

sold

or

manufactured

by

MFJ

Enterprises,

Inc.

——

=

6.

Wired

and

tested

PC

board

products

are

covered

by

this

warranty

provided

only

the

—

wired

and

tested

PC

board

is

returned.

Wired

and

tested

PC

boards

installed

in

‘(<>

the

owner’s

cabinet

or

connected

to

switches,

jacks,

cables,

etc.

sent

to

MFJ

Enter.

=

5—

prises,

Inc.

will

be

returned

at

the

owner’s

expense

unrepaired.

—

7.

Under

no

circumstances

is

MFJ

Enterprises,

Inc.

liable

for

consequential

damages

to

=

person

or

property

by

the

use

of

any

MFJ

product.

—)

8.

Out-of-Warranty

Service:

MFJ

Enterprises,

Inc.

will

repair

any

out-of-warranty

pro-

\

duct

provided

the

unit

is

delivered

prepaid.

All

charges

will

be

shipped

COD

to

the

owner.

9.

This

warranty

is

given

in

lieu

of

any

other

warranty

express

or

implied.

10.

MFJ

Enterprises,

Inc.

reserves

the

right

to

make

changes

or

improvement

in

design

or

manufacture

without

incurring

any

obligation

to

install

such

changes

upon

any

of

the

products

previously

manufactured.

11.

All

MFJ

products

to

be

serviced

in-warranty

or

out-of-warranty

should

be

addressed

to

MFJ

Enterprises,

Inc.,

921A

Louisville

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.

(i

ididil(

|

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(\

ill

\\

=

=

=

e

=,

]

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