MFJ MFJ-1836 Manuale utente

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MFJ-1836,

MFJ-1836H

6,

10,12,15,17,20

Meter

Cobweb

Antenna

Instruction

Manual

Caution:

Read

All

Instructions

Before

Assembling

and

Using

This

Product!

MF

J

300

Industrial

Park

Road

Starkville,

MS,

39759

USA

Tel:

662-323-5869

Fax:

662-323-6551

MFJ-1836

(300-W)

and

1836H

"Cobweb"

(1500-W)

HF

Antenna

Introduction:

The

horizontally

polarized

MFJ-1836

and

MFJ-1836H

Cobweb

antennas

cover

20,17,15,

12,10,

and

6

Meters

in

a

compact

9-foot

by

9-foot

"neighbor-friendly"

package.

Both

are

carefully

designed

using

heavy-gauge

formed-aluminum

components,

stainless-steel

hardware,

and

premium

fasteners

to

deliver

years

of

trouble-free

performance.

Parts

List:

Before

beginning

assembly,

check

the

package

contents

against

the

parts

list

below

to

ensure

all

items

have been

included.

Materials:

8"

x

8"

Aluminum

Mounting

Plate

(737-1836)

72"

Fiberglass

Element

Support

Tube

(811-1836-1)

43"

Fiberglass

Feed

Tube

(811-1836-2)

50-Ohm

to

12.5

Ohm

Match

Box

(10-1836-1

or

10-1836-1H)

Mast-Mounting

Bracket

(735-1836)

Element

End-insulators,

12”

x

.5"

(737-0115)

Pack,

6-Meter

Element

Wire

(13-1836-6)

Pack,

10-Meter

Element

Wire

(13-1836-10)

Pack,

12-Meter

Element

Wire

(13-1836-12)

Pack,

15-Meter

Element

Wire

(13-1836-15)

Pack,

17-Meter

Element

Wire

(13-1836-17)

Pack,

20-Meter

Element

Wire

(13-1836-20)

Hardware

Pack

(17-1836-1)

Sa

a

eC

|

PC

NGG

Hardware

Pack

Contents:

[]

10

6-32

x

1-1/4"

screw

(656-1250S)

[]

20

6-32

x

1"

screw

(656-1000S)

[

]

4

6-32

x

1/2"

screw

(656-0500S)

[ ]

14

6-32

x

3/8"

screw

(656-0375S)

[]

52

6-32

nylon-insert

lock

nut

(705-0632S-NL)

Ey

4

6-32

Kep

nut

(705-0632S-k)

[]

38

#6

Flat

Washer

(561116)

[

]

2

U-Boit

Assembly

(758-9199)

{]

5

Cable

Tie

(745-2158B)

{]

4

#10

worm

clamps

with

hole

for

6-32

hardware

(030410)

If

any

parts

are

missing

or

damaged,

refer

to

the

Warrantee

page

for

replacement

instructions

and

have

the

MFJ

part

number

listed

above

available.

Preparation

and

Site

Safety:

To

assure

smooth

assembly,

sort

the

parts-bag

hardware

in

advance

and

follow

the

step-by-step

instructions.

Construction

through

Step-3

can

be

completed

almost

anywhere,

but

installing

the

spreaders

and

stringing

the

element

wires

will

require

a

flat

12-foot

by

12-foot

work

area.

For

initial

tuning,

mount

the

cobweb

5

to

6

feet

off

the

ground

on

a

temporary

mast

or

tripod,

and

be

sure

to

wear

safety

glasses

when

working

around

the

element

wires

and

spreaders.

Also,

enlist

a

helper

or

observer

for

final

installation,

and

never

work

near

power

lines

or

entrance

cables!

Important

Warning:

The

Cobweb

is

an

electrical

conductor.

If

it

comes

in

contact

with

power

lines

or

entrance

cables

during

assembly

or

installation,

you

could

be

KILLED.

Tools:

[ ]

5/16"

and

7/16"

nut

drivers

for

6-32

and

1/4-20

hardware.

[

]

Phillips-head

screwdriver

(#2)

[

]

Diagonal

cutters

or

"nippy"

shears

(for

trimming

cable

ties).

[

]

Safety

glasses

or

prescription

eye

protection

Pre-assemble

the

Antenna

Hub.

Use

the

parts

listed

below:

8"

x

8"

aluminum

base

plate

6-32

x

1-1/4"

screw

6-32

x

3/8"

screw

6-32

lock

nut

‘1:

[

[

[

[

[

43"

fiberglass

tube

aS

ee

yo

es

-OABRNNM

°

Mounting

Plate”

Mounting

fo

=

Bracket

<—

=

{

]

Install

the

mast-mount

bracket

using

four

3/8"

screws

and

nuts.

Insert

screws

as

shown

above:

Mounting

Plate

Install

Tube

Between

cou

the

Mounting

Plates

[>

Tube.

i

ty}

Lol

6-32

x

1-1/4"

[

]

Position

the

second

base

plate

opposite

the

first

so

all

mounting

holes

align.

Install

the

43"

feed

tube

by

sliding

it

in

between

the

two

plates.

Secure

using

two

1-1/4"

screws

and

nuts

(see

above):

2.

Install

the

Match

Box:

For

MFJ-1836:

Use

parts

listed

below

[

]

1

50-ohm

to

12.5

ohm

match

box

{ ]

1

6-32

lock

nut

[]

5

Cable

tie

wrap

Fomalo

UHF

Balun

G

tng]

Match

Box

Forritos

In-Line

ti

a

=a.

ll

Feod Tube

TaN

(3)

Se.

(=

i

=|

Hot

=

Mounting

Stud

oP

Baad

Tie-Wraps

~

[

]

Mount

the

match

box

at

the

opposite

end

of

the

feed

tube

using

a

6-32

nut.

Secure

the

coax

pigtail

with

three

cable

tie

wraps.

Note

that

the

box

mounts

on

top

side

of

the

feed

pole.

Use

the

remaining

two

cable

ties

to

secure

your

feedline

later

on.

For

MFJ-1836H:

Use

parts

listed

below.

[J

4

High-power

50-ohm

to

12.5

ohm

Match

Box

[]

2

6-32

lock

nuts

[

]

2

Cable

tie

wrap

7

,

Ne

|

Food

Tubo

es

a

Balun

=

ell

High-Power

Matching

box

Tio-Wraps

Farrites

if

J

ene

Elomont

Wire

Posts

[ ]

Mount

the

match

box

at

the

end

of

the

feed

tube

using

two

6-32

nuts.

Note

that

the

high-power

match

box

mounts

on

the

bottom

side

of

the

feed

pole

so

the

screened

air-

vents

will

face

toward

the

ground

when

the

antenna

is

installed.

Secure

the

feed

line

with

two

cable

tie

wraps.

Use

the

remaining

three

to

secure

your

feedline

later

on.

3.

Prepare

Spreader

Tubes.

Use

the

parts

listed

below.

ET

4

72"

fiberglass

element

support

tube

[

]

20

6-32

x

1"

screw

{

]

20

6-32

lock

nut

t]

20

#6

flat

washer

7

8-32

x

1"

(x5)

T

:

T

*

id

Flat

Washer(x&)

tT

Element

Support

Tube

o

o

™I~Ny-Lock

Nut

(x5)

@

[

]

Install

a

6-32

x

1"

screw

and

flat

washer

at

each

wire

attachment

point

on

all

four

spreader

arms.

Tighten

each

lock

nut

only

enough

to

retain

the

screw.

4.

Install

Spreaders

in

the

Base:

This

step

requires

a

12'x12'

flat

work

area.

Use

the

following

items:

[]

8

6-32

x

1-1/4"

screw

{]

8

6-32

lock

nut

When

installing

spreaders,

orient

so

the

wire-guide

washers

are

on

top.

[ ]

Loosen

(but

don't

remove)

the

two

nuts

securing

the

feed

tube.

[ ]

Loosely

install

all

four

spreader

arms

using

two

1-1/4"

screws

for

each.

[ ]

Once

all

four

spreaders

installed

are

in

place,

tighten

all

hardware

securely.

5.

Install

Mast-mount

U-bolts:

The

MFJ-1836H

matching

network

weighs

slightly

more

than

the

MFJ-1836

network,

so

the

mast

U-bolts

are

installed

differently

to

maintain

the

antenna's

center

of

gravity.

o

MFJ-1836

MFJ-1836H

For

MFJ-1836:

[

]

Install

the

two

U-bolt

assemblies

so

the

mast

inserts

inside

the

mast

mount

bracket.

For

MFJ-1836H:

[ ]

Install

the

two

U-bolt

assemblies

so

the

mast

inserts

on

the

outside

of

the

bracket.

6.

Install

Wire

Elements:

Before

you

begin,

mount

the

antenna

on

a

temporary

mast

or

tripod

with

the

base

5

or

6

feet

above

ground

(near

eye

level).

Wire

installation

will

begin

with

the

10-meter

(inner)

element

wires

and

work

outward

to

20

meters.

The

6-meter

element

will

be

installed

later.

Use

the

following

parts:

5

Insulator

strips

1

6-Meter

wire

pack

1

10-Meter

wire

pack

4

12-Meter

wire

pack

|

15-Meter

wire

pack

4

17-Meter

wire

pack

1

20-Meter

wire

pack

10

6-32

x

3/8"

screw

12

6-32

nut

a

10

#6

Flat

Washer

[ ]

Open

the

10-meter

wire

pack,

uncoil

the

wires,

and

carefully

remove

tangles

or

kinks.

[

]

Attach

the

element

wires

to

the

matchbox

terminals.

[

]

Start

a

6-32

nut

over

each

terminal

to

hold

lugs

in

place

while

stringing

the

wires.

[ ]

Route

element

wires

around

to

the

opposite

side

of

the

spreader

frame.

Catch

each

wire

under

the

inner-most

set

of

flat

washers

(see

below).

Do

not

tighten

screws

yet,

wires

should

remain

free

to

slide

back

and

forth.

String

wires

from

feedpoint

to

insulator

Pass

wire

underwasher:

secure

Wire

at

end

hole

|

Insulator

a

@

Do

not

tighten

nut

Insulator

Strip

Trim

for

desired

frequency

[

]

Connect

each

wire

to

a

insulator

strip

as

shown,

using

6-32

screws

and

nuts.

Be

sure

to

center

the

insulator

between

the

two

spreaders.

For

the

10-meter

element,

dimension

"D"

will

be

about

19".

When

setting

wire

tension,

minimize

but

do

not

completely

eliminate

wire

sag.

If

the

element

wires

are

pulled

too

tightly,

they

could

stretch

or

break

under

stress

when

the

frame

is

buffeted

by

high

winds.

Excess

wire

should

hang

straight

down.

These

ends

will

be

pruned

to

tune

the

antenna

in

Step

8.

Once

the

10

meter

element

wires

are

installed,

repeat

the

same

procedure

for

the

other

four

HF

bands.

As

you

add

additional

element

wires

to

the

match

box

terminals,

fan

the

ring

lugs

out

to

maintain

flat

metal-to-metal

contact

(see

below).

Fan

leads

so

lugs

make

full

surface-to-surface

[

]

Install

the

12-meter

loop.

Dimension

"D"

will

be

approximately

23-1/4"

[ ]

Install

the

15-meter

loop.

Dimension

"D"

will

be

approximately

28-3/4"

[

]

Install

the

17-meter

loop.

Dimension

"D"

will

be

approximately

34-3/4"

[

]

Install

the

20-meter

loop.

Dimension

"D"

will

be

approximately

45-3/4"

After

all

wires

are

installed,

check

each

for

even

tensioning.

Re-adjust

as

needed

to

ensure

no

wires

are

pulled

up

too

tight

or

hanging

too

slack.

Also,

confirm

that

the

frame

is

square.

When

satisfied,

tighten

down

all

wire-attachment

screws.

7.

Install

the

6-meter

element:

Note

that

installation

of

the

6-meter

element

may

be

omitted

without

impacting

operation

on

other

bands.

To

install,

use

the

following

items:

6-Meter

wire

pack

Worm-clamp

6-32

x

1/2"

screw

6-32

lock

nut

6-32

Kep

nuts

#6

Flat

Washer

opaARA

Prepare

all

four

6-meter

wire

guide

assemblies,

as

show

below:

Ny-lock

Nut

Flat

Washers

(2)

——

eS

Kep

Nut

Insert

[

]

Open

up

the

worm

clamp

(turn

hex-nut

counterclockwise

to

release

the

band).

[

]

Insert

6-32

x

1/2"

screw

though

hole

in

the

worm

clamp.

Secure

with

Kep

nut.

{

]

Install

two

flat

washers

and

a

nylon

locking

nut,

as

shown.

Unlike

the

other

five

elements,

the

6-meter

element

is

"corner-fed"

and

does

not

wrap

around

the

center

hub.

Install

as

shown:

Match

Box

Z—

Wire

Guide

(x4)

{ ]

Measure

(

6")

toward

the

center

hub

from

the

10-meter

element

guide

(see

above).

{

]

Install

a

worm-clamp

wire

guide

on

the

spreader

at

this

location.

[

]

Measure

(22")

beyond

this

guide

and

install

a

second

guide.

[ ]

Repeat

on

the

other

side

of

the

match

box.

en

Element

Wire

—

‘Fee

Flat

Washers

(2)

——

Spreader

Arm

fa

@

Worm-Clamp

[ ]

Install

the

6-meter

element

wires

on

the

match

box.

[

]

String

and

capture

the

element

wires

on

the

wire

guides,

as

shown.

»

Hang

the

excess

wire

straight

down,

avoiding

close

proximity

to

the

center

hub.

Like

the

other

elements,

these

ends

will

be

pruned

during

tune-up.

8.

Tune

Up:

The

cobweb

should

be

at

least

6

feet

above

ground

and

weather

conditions

dry

for

initial

tuning.

If

at

all

possible,

use

a

handheld

antenna

analyzer

for

measuring

SWR

and

pruning.

Also,

stand

a

few

feet

back

from

the

end

insulators

when

checking

to

avoid

deiuning

the

elements.

Important

Note:

|f

you

use

a

transmitter

and

SWR

meter

for

tune

up,

apply

the

minimum

power

needed

to

calibrate

the

bridge.

A/so,

never

touch

RF-energized

element

wires!

RF

burns

are

extremely

painful,

slow

to

heal,

and

can

be

inflicted

at

surprisingly

low

power

levels.

When

pruning

for

minimum

SWR,

trim

the

wire

ends

on

each

side

of

the

insulator

as

evenly

in

length

as

possible.

Also,

prune

in

small

increments

to

avoid

over-shooting

your

target

frequency.

You

may

find

one

or

more

minimum

SWR

readings

are

somewhat

elevated

with

the

antenna

in

close

proximity

to

ground.

These

readings

normally

drop

down

once

the

antenna

is

raised

higher.

Start

with

20

meters

and

work

inward:

[ ]

Find

the

initial

SWR

dip.

It

will

normally

occur

below

the

edge

of

the

band.

[ ]

Prune

wires

in

small

steps

to

obtain

minimum

SWR

on

your

desired

frequency.

[ ]

Once

tuned,

twist

the

wire

ends

tightly

to

prevent

individual

"hairs"

from

sticking

out.

For

MFJ-1836H:

Apply

solder

to

each

wire-end

to

prevent

it

from

fraying.

"Solidifying"

the

element

tips

with

solder

is

especially

important

at

high

power

levels

to

prevent

corona

or

sparking.

Repeat

the

above

tuning

procedure

on

the

other

bands:

[

]

Tune

17

meters

[

]

Tune

15

Meters

[

]

Tune

12

Meters

[

]

Tune

10

Meters

[

]

Tune

6

Meters

(if

installed)

Installation:

Cobwebs

perform

best

when

mounted

20-feet

or

more

above

ground

and

clear

of

nearby

wiring,

large

metal

surfaces,

or

other

antennas.

When

guying,

use

a

non-

conducting

line

such

as

Phillystran

or

black

Daycron.

The

U-bolts

accept

any

mast

diameter

between

1-1/4"

and

1-3/4"

OD.

Doubling

the

wall

thickness

is

recommended

for

longer

sections

of

un-guyed

mast.

Coax:

Premium-grade

RG-8X

feedline

works

well

up

to

1000

watts.

It's

easy

to

handle,

light

in

weight,

and

places

minimal

stress

on

the

support

mast.

For

higher

power,

use

RG-8,

RG-213,

or

a

premium-grade

equivalent.

Avoid

RG-58

except

for

short

cable

runs

and

portable

setups.

Safety

Ground:

Install

one

or

more

ground

rods

and

connect

them

to

the

mast

with

#10

solid

wire

and

stainless

hardware.

Coax

Disconnect:

Install

outside

the

building

and

unhook

coax

any

time

your

station

is

unattended

or

severe

weather

approaches.

It's

your

best

lightning

protection!

Using

a

Tuner:

The

cobweb's

folded

half-wave

elements

have

somewhat

less

bandwidth

than

straight-line

elements.

If

needed,

you

may

use

a

tuner

to

expand

low-

SWR

coverage

to

the

margins

of

the

wider

bands

(it

won't

harm

the

antenna).

Also,

be

aware

that

precipitation

loading

from

heavy

rain,

snow,

or

ice

accumulating

on

the

wires

will

temporarily

lower

resonant

frequency,

elevating

in-band

SWR

readings.

You

may

use

a

tuner

to

compensate

for

this

condition

during

weather-related

events.

Typical

Specifications:

Minimum

SWR:

Normally

1.2:1

or

less

on

all

bands,

measured

at

20'

AGL

Modeled

Gain:

4.7

dBi

at

20-feet

AGL

on

14.2

MHz

with

a

37°

TOA.

Modeled

Pattern:

+1.5

dB

with

maximum

gain

occurring

on

axis

with

the

feedpoint.

MFJ-1836

Power:

300-W

PEP,

SSB/CW,

ICAS

(<50%

transmit

time)

MFJ-1836H

Power

1500-W

pep,

SSB/CW,

ICAS

(<50%

transmit

time)

Balun

Ferrite-sleeve

"choke"

over

coax

Matching

Network

=

4:1

broadband

step-down

autotransformer

Dimensions:

9’

x

9'

per

side,

12'

diagonal.

Weight:

MF

J-1836

8.2

pounds,

MFJ-1836H,

8.8

pounds

Mast

Size

1-3/4"

OD

maximum

Warrantee

If

manufactured

by

MFJ

Enterprises,

Inc.

and

purchased

from

an

authorized

dealer

or

directly

from

MFJ,

we

warrant

to

the

original

owner

that

this

product

shall

be

free

from

defects

in

material

and

workmanship

for

a

period

of

12

months

from

date-of-purchase

provided

the

following

terms

and

conditions

are

satisfied:

1.

The

purchaser

must

retain

a

dated

proof-of-purchase

(bill

of

sale,

cancelled

check,

credit

card

or

money

order

receipt,

etc.)

describing

the

product

so as

to

establish

the

validity

of

the

warranty

claim.

In

addition,

the

original

copy

or

machine

reproduction

of

such

proof

shall

be

provided

to

MFJ

at

the

time

of

warranty

service.

MFJ

shall

have

the

discretion

to

deny

warranty

service

without

dated

proof-of-purchase.

Any

evidence

of

alteration,

erasure,

or

forgery

shall

be

cause

to

void

any

and

all

warranty

terms

immediately.

2.

MFJ

agrees

to

repair

or

replace,

at

its

option

and

without

charge

to

the

original

owner,

any

defective

product

under

warranty,

provided

the

product

is

returned

postage

prepaid

to

MFJ

Enterprises,

Inc.

with

a

personal

check,

cashiers

check,

or

money

order

in

the

amount

of

$7.00

to

cover

postage

and

handling.

3.

MFJ

Enterprises,

Inc.

will

supply

any

replacement

parts

free

of

charge

for

any

MFJ

product

under

warranty

upon

request.

A

dated

proof-of-purchase

and

a

$5.00

personal

check,

cashiers

check,

or

money

order

must

be

provided

to

cover

postage

and

handling

for

parts

and

materials.

4.

This

warranty

shal!

not

be

voided

for

owners

who

attempt

to

repair

defective

units.

Technical

consultation

is

available

by

calling

(662)

323-5869.

5.

This

warranty

does

not

apply

to

kits

sold

by

or

manufactured

by

MFJ

Enterprises,

inc.

(once

assembly

begins,

the

owner

becomes

the

manufacturer).

6.

Wired

and

tested

PC

board

products

are

covered

by

this

warranty

provided

only

the

wired

and

tested

PC

board

product

is

returned.

Wired

and

tested

PC

boards

installed

in

the

owner's

own

cabinet

or

connected

to

switches,

jacks,

or

cables,

etc.

and

sent

to

MFJ

Enterprises,

Inc.

will

be

returned

at

the

owner's

expense

un-

repaired.

7.

Under

no

circumstances

shall

MFJ

Enterprises,

Inc.

be

liable

for

consequential

damages

to

persons

or

property

by

the

use

of

any

MFJ

products.

8.

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.

9.

This

warranty

is

given

in

lieu

of

any

other

warranty

expressed

or

implied.

10.

MFJ

Enterprises,

Inc.

reserves

the

right

to

make

changes

or

improvements

in

the

design

or

manufacture

of

its

products

without

incurring

any

obligation

to

install

such

changes

upon

products

previously

manufactured.

11.

All

MFJ

products

to

be

serviced

in-warranty

or

out-of-warranty

should

be

addressed

to

MFJ

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

a

dated

proof-of-purchase.

12.

This

warranty

conveys

specific

rights,

and

you

may

also

be

entitled

to

other

rights

which

may

vary

from

state

to

state.