MFJ MFJ-1799 Manuale utente

CAUTION: Read All Instructions

Before Operating Equipment

300 Industrial Park Road

Starkville, MS 39759 USA

Tel: 662-323-5869 Fax: 662-323-6551

MFJ-1799

2,6,10,12,15,17,20,30,40,80 METER

INSTRUCTION MANUAL

Vertical Antenna

Introduction

Thank you for purchasing the MFJ-1799 vertical HF antenna. You new antenna is composed of

High strength 6063 aircraft aluminum for excelent rigidy and light weight. Silver plated wire with

Teflon insulation is use on a fiberglass core to ensure low resistance and high power handling

capablility on each loading section. A large diameter air wound balun prevents feed line radiation

and pattern distortion.

Preparation

This antenna although it is not heavy, is large and cumbersome for one person to handle.

It has lots of pointy rods that protrude in every direction. Safety glasses are recommended during

the assembly and tuning. Assemble the antenna away from other people. Do not allow children

in the assembly area. Only the people involved in the construction should be near.

Assembly can be done by one person but when the antenna is to be mounted or moved, plan to

have a friend to help. It is not wise to attempt to install any antenna without help. You will need

some type of support on each end of the antenna while you are installing the spokes into the rings.

Some of the spokes are four feet long. The antenna can not be on the ground after the spokes are in.

Assembly and tuning of the antenna will take time so allow several hours for this. Don’t rush.

The more time you put into the antenna, the better the results will be.

WARNING

KEEP THIS ANTENNA

AWAY FROM POWER LINES

Never mount or move any antenna where it can come into contact

with power lines. If this antenna comes into contact with power

lines, it can KILL you. Never mount any antenna where if it fell

it could come into contact with power lines.

Assembly

Before you begin assembly, find a place suitable for antenna

construction. This area should be free of power lines and

obstructions so that you may move the antenna freely. It is

best that the area be a flat level surface to allow you to lay the

antenna on its side using saw horses or some other type of

support. A driveway makes a very good location to assemble

the antenna. If you attempt to assemble the antenna over grass,

you will drop something and it will be gone forever.

336, 5 ,6

34, 5 ,6

811-1799-RT 811-1799-RT

Main Radiator

These are the parts you will need for the main radiator assembly.

1. Two 1-3/8 x 60 inch ( 5f t ) Aluminum tubes

2. One 1-1/2 x 12 inch double walled Aluminum tube.

3. Two 1-1/4 x 12 Fiberglass Rods.

4. Two 1/4-20 x 1-3/4 Bolts

5. Four 1/4 split washers

6. Four 1/4-20 Nuts

7. One Shunt coil

36 Two 1/4-20 x 2” Bolts

Assemble the main radiator as shown in the diagram. The main

tubes (Item #1) are the same on each end so it doesn’t matter

which end you attach to the center insulator. Slide the insulator

into the tubes and alighn the holes. Insert the bolts through the

holes and slide the split washer on.

On the center section, slide the shunt coil (#7) on before the split

washers. Thread the nut on and tighten it using a 7/16 wrench or

socket. You may need an additional wrench to hold the bolt on

the other side.

1-3/4

2”

Stretch or compress the coil so that

the legs are perpendicular to the tubes.

It may have become distorted in the

shipping process.

Stub Assembly Parts needed for this assembly

8. Two double brackets made out of aluminum

9. Twelve 6-32 x ½ phillips head screws

10. Twenty four 6-32 nuts with built in lock washers.

11. Four single brackets made out of ABS plastic

12. Twelve half clamps made out of aluminum.

13. Twelve 6-32 x 1-½ long phillips head screws

14. Two threaded rods for 2 meters (short)

15. Two threaded rods for 6 meters (long)

16. Eight 10-32 nuts

17. Eight #10 split washers.

Use the 6-32 x ½ inch screws and 6-32 nuts to attach a half clamp

to each bracket as shown.

Two of these Four of these

Install the brackets onto the main radiator in the places shown.

Place the double brackets about ½ inch from the bolts.

Install the 2 and 6 meter stubs using the 10-32 bolts and washers.

Place the insulating plastic brackets about 4 inches from the end

of each stub for support.

½ inch

6mtr stub

2mtr stub

Base Bracket Assembly Loosely assemble the base

bracket using the hardware

as shown.

18 Smaller U-bolt (Antenna side)

19 Smaller saddle (Antenna side)

20 Base bracket

21 Larger saddle (Mast side)

22 Larger U-bolt (Mast side)

23 5/16 Split washer

24 5/16 Hex Nut

Slide the Mast bracket onto the bottom of the antenna.

The mast should level with the top of the bracket and

the bottom of the antenna should be level with the

bottom of the bracket. The mast tube is shown for

reference. You do not need to mount it at this time.

Top View

Cross Tube

Disassemble the U-bolt set and attach the cross

tube to the main radiator just above the bolt at

the bottom insulator. About ½ inch above the

bolt will be fine. Orentation of the cross tube

does not matter

Use a split washer and a 10-24 nut to secure the Balun to the

mast bracket. Route the upper coax to the center feed point

of the antenna. Connect the center conductor eyelet to the

top section of the antenna and the shield to the lower part of

the antenna.

25 U-bolt set

26 Cross tube

27 Balun Assembly

28 10-24 nut

29 #10 split washer

6 Two 1/4-20 nuts

5 Two 1/4-20 split washers

30 Two 4-40 nuts with keep washer

10M

12M

15M

17M

20M30M40M

10M

12M

15M

17M

20M30M40M

1/8 AL spoke cap

Loosely fit the 6-32 x ½ screws and nuts into the rings.

Insert the rods into the ring and tighten the screws.

The rings are shown further apart than they are on the

loading section for illustration only. You do not need to

unbolt them from the tube. You may install the caps

on the ends of the tube now or wait till later after the

antenna is tuned. The caps will have to be removed

to trim the rods.

Install the rod in both 10-40 meter loading sections. Three lengths of

rods are included. The short rods are for the 10-30 meter sections.

The medium size rods are for the 40 meter section. 4 rods go in each

ring.

The top loading coil has an extra jumper and a adapter tube at the bottom.

Install the rods in the bottom loading coil the same way as the top.

6-32 x ½

31 Forty eight short 1/8 inch rods

32 Eight medium 1/8 inch rods

33 Fifty six rod caps

9 One hundred and twelve 6-32 x ½

10 One hundred and twelve 6-32 keep nuts

34 10-40 top loading coil

35 10-40 bottom loading coil

Install the 80 meter spokes (48 inches) into the 80 meter loading coil ring. This ring

requires 8 rods per ring. The two 80 meter loading coils are the same so it doesn’t

matter which one is on top or bottom.

1/8 AL spoke 48” (8 places)

Un-tighten the pre-installed screws and insert the

rest of the screws and nuts loosely. Insert the

spokes and tighten all eight screws.

80 Meter Capacity Hat Ring

36 Sixteen 48 inch rods

9 Twelve 6-32 x ½ screws

10 Twelve 6-32 keep nuts.

Slip a #10 hose clamp over each end of the cross tube.

Slide the bottom loading sections into the cross tube

as shown. Lift the aluminum strip on the end so that

it goes over the tube but under the hose clamp. This

makes the electrical connection for the coil.

Spokes not shown

10T

10M

13T

17M

1-1/8 x 8

Top of main radiator

Slide the top 10-40 loading coil 3 inches down into the top of the

main radiator. Use a # 16 hose clamp to hold it in place. Use the

joining section of tubing to connect the 10-40 loading coil to the

80 meter coil on top. Use two #10 hose clamps to hold them.

Allow the aluminum strips to go under the hose clamps as before.

Two inches over lap on each end will be enough to secure the tube.

37 1-1/8 x 8 Al tube

38 Five #16 hose clamp

Each band on the antenna will be tuned individually. Each

band has its own set of spokes, four on top and four on bottom

for the 10-40 bands. These spokes will be cut on each end to

adjust the frequency of the antenna. The 80 meter section

has a movable tap on the large loading coil on each end.

For best results, the lower frequencies should be tuned first.

Start at 80 meters.

Tuning of the antenna will be done by measurement of the

SWR at each band. Although a radio with a watt meter can

be used to adjust the antenna, a SWR meter such as the MFJ-

259 or 269 is HIGHLY recommended. If you don’t have one,

find a friend that does. It will save you a lot of time. Mounting

the antenna on a tilt base such as the Hy-gain ATB-75 or

MFJ-1903 will also make raising and lowering easier. The

antenna can not be tuned while lying on its side. Installation

on a temporary mast will make tuning easier as you will be

raising and lowering the antenna for adjustment. It is best

to get the antenna close to the frequencies you want while it

is just a few feet off the ground and then do a final tuning

when the antenna is in its final location. Remember that the

distance the antenna is from the ground will affect the tuning

so initial tuning should be at the bottom of each band. When

the factory length spokes are installed, each swr dip point will

be well below each band.

Take your time tuning the antenna. Trimming the spokes for

each band and raising and lowering the antenna can be time

consuming but this is very important step. You may consider

installing the antenna in a temporary location or leaving it on

its tuning mast for a while. It will be more difficult to modify

the antenna if you decide to change the tuning points once it

is in its permanent location.

20 17 15 10

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