MFJ MFJ-1799 Instructions
MFJ-1799
2,6,10,12,15,17,20,30,40,80 METER
Vertical Antenna
INSTRUCTION MANUAL
CAUTION: Read All Instructions
Before Operating Equipment
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-5869 Fax: 662-323-6551
COPYRIGHT 2 01 3 MFJ Enterprises Inc.
C
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.
Main Radiator
These are the parts you will need for the main radiator assembly.
1
1. Two 1-3/8 x 60 inch ( 5f t ) Aluminum tubes
2. One 1-1/2 x 12 inch double walled Aluminum tube.
2”
3
1
36, 5 ,6
7
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
3
2
811-1799-RT 811-1799-RT
Stretch or compress the coil so that
the legs are perpendicular to the tubes.
It may have become distorted in the
shipping process.
4, 5 ,6
Stub Assembly
15
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.
8
11
15
9
9
14
12
Two of these
Use the 6-32 x ½ inch screws and 6-32 nuts to attach a half clamp
to each bracket as shown.
10
13
12
Four of these
13
10
14
12
10
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.
6mtr stub
12
10
16
17
½ inch
2mtr stub
Base Bracket Assembly
21
20
19
18
19
23
18
24
22
22
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
21
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.
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