MFJ | 1896 | manual | MFJ 1896 - 6-METER MOXON ANTENNA Manual

MFJ 1896 - 6-METER MOXON ANTENNA Manual
MFJ-1896
Lightweight Moxon for 6 meters
INSTRUCTION MANUAL
CAUTION: Read All Instructions Before Operating Equipment
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-9715 Fax: 662-323-6551
COPYRIGHT
C
2012 MFJ Enterprises Inc.
GENERAL DESCRIPTION
The MFJ-1896 6-Meter Moxon has a broad cardioid pattern with 3.3 dBd forward gain
and high front-to-back ratio. Element span is about 7 feet on a 35 inch boom with a
turning radius less than 4 feet. The antenna uses high grade aircraft aluminum tubing
for rigidity and light weight construction.
Choosing a location
For best performance on receiving and transmitting, mount the antenna in a clear location
above or away from buildings, towers, feedlines, utility wires, and other antennas. While
your own ingenuity and particular circumstances will determine the final mounting method,
we’ll pass along a few ideas for both permanent installation and portable operation.
Never mount this antenna in a location that will permit unsuspecting people to come in
contact with the antenna elements.
Never mount this antenna where a mechanical failure might allow the antenna to contact
power lines or other utility wires.
Always ground the feedline at the point where it enters a building to a good earth ground
for lightning protection.
WARNING Always mount this antenna so that it is out of reach of adults and children.
The elements can cause injury and/or severe RF burns.
WARNING
WHEN INSTALLING YOUR SYSTEM, TAKE EXTREME
CARE TO AVOID ANY ACCIDENTAL CONTACT WITH
POWER LINES OR OVERHEAD OBSTRUCTIONS.
FAILURE TO EXERCISE THIS CARE COULD RESULT
IN SERIOUS OR FATAL INJURY
2
Permanent Installation
The ideal installation is a rigid pole or roof mount that puts the antenna completely
in the clear. If the ideal installation is not possible, choose the best compromise.
TV mast, heavy-duty rigid electrical conduit, and steel water pipes are suitable
mast materials. The use of soft or thin wall mast is not recommended.
Portable Operation
The MFJ-1896 may be easily transported to temporary locations for portable,
emergency, and contest operation. Even for temporary or portable operation, do not
be casual about selecting a suitable mast. If the antenna falls, it can be damaged and
may cause serious injury. Whatever type of installation you choose, remember that
the antenna should be installed where it cannot be contacted by people or animals or
come in contact with power lines.
Antenna Assembly
Assemble the antenna on a flat level surface. Avoid assembly over grass as you may
drop some of the parts and never find them again. Install the front element bracket
on the boom. It doesn’t matter which end of the boom you choose. Use the 10-24
bolts to secure the bracket to the boom while also installing the main elements into
each side of the bracket. Pass the bolts through the holes inside the elements. You
may secure them at this time.
10-24 x 1-3/4
10-24 x 1
10-24 x 1
11
3
17
Boom tube
18
Figure 1
3
Secure the driven element insulator to the other end of the boom using the 2 inch 10-24
bolt. It does not matter on which side of the boom you install the insulator. Install the
remaining two main elements to the insulator as shown in figure 2. The bolt must pass
through the bottom of the insulator first as the rest of the bolt will be used to fasten the
feed line.
10-24 x 2”
18
17
3
10-24 x 1”
Long end
10-24 x 1”
Figure 2
#4 hose clamp
16-1/4
7/16 x 14”
3-3/4”
3/8 insulator
Assemble the end elements as shown in figure 3.
Use the #4 hose clamps to secure the tubing
together. The corner tubes have one side longer
than the other. Insert the short end into this tubing
and leave the long end out. Do this twice, one for
each end.
7/16 x 9”
11-3/8”
Figure 3
Long end
4
42-1/4”
42-1/4”
Change depth here to
adjust element length.
Short tube is on the
driven element side
Figure 4
Install the end pieces onto the elements using the #4 hose clamps. The short side of the
end piece is on the driven element side of the antenna. The driven elements are the ones
attached to the plastic insulator on the boom. Adjust element length by sliding corners in or
out of the main element. Install the u-bolt on either side of the boom. Attach the balun
assembly to the driven element using the 10-24 nuts and washers as shown in figure 6.
Fasten the coax to the boom with electrical tape or other means. Place the 1-1/4 end
caps on each end of the boom.
Electrical tape
18
8
17
Figure 5
Figure 6
5
Final Assembly
Check the alignment of the elements and make sure all hardware is tight. Mount the antenna
in the final location.
Connect the coax balun to a high quality low loss cable such as LMR-400 or equivalent.
SWR Check
Resonance can be checked with an MFJ-256 or MFJ-269. Alternately a transceiver and
SWR meter can be used. Resonance may be changed by adjusting the length of the element
length. If the resonance point is too low, shorten the element length. If the resonance point
is too high, lengthen the element.
Grounding Considerations
Although this antenna is designed to operate efficiently without the requirement of an earth
ground, safety grounding must still be provided to protect equipment, property and persons
from the hazards fo lightning strikes and other weather related electrical discharges. In addition,
the coaxial cable feeding the antenna should have the shield grounded to eliminate the risk of
any indoor equipment failure allowing hazardous voltages that could create a shock hazard.
Adequate protection can be accomplished by grounding the shield of the coax to a good earth
ground where it enters the building, or directly burying the cable in the earth for several feet
before it enters the building. For maximum lightning protection, the coaxial cable should be
totally disconnected from the station during threatening weather conditions.
PARTS LIST
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
20-1896-1
20-1896-2
20-1896-3
20-1896-4
20-1896-5
20-1896-6
13-0246-6
Tube, Boom, 1-1/4 .035 x 35” Drilled ------------------------Tube, 7/16 x .028 x 39” Drilled ----------------------------------Tube, 7/16 x .028 x 14” slotted ---------------------------------Tube, 7/16 x .028 x 9” slotted ----------------------------------Tube, 3/8 corner -------------------------------------------------Rod, Fiberglass 3/8 x 6” -----------------------------------------Coax, Pig Tail With Ferrite beads ------------------------------
17-1896-1
Parts Pack MFJ-1896
745-3104S
465420
160055
455630
758-9199
500321
500157
504069
711-1037S
554071
Hose Clamp #4 -----------------------------------------------------Insulator ABS feed point -----------------------------------------Bracket, element to mast ---------------------------------------Caplug, 1-1/4 ABS -----------------------------------------------U-bolt 1-3/4 ---------------------------------------------------------Bolt, 10-24 x 1-3/4” -----------------------------------------------Bolt, 10-24 x 2” ----------------------------------------------------Bolt, 10-24 x 1” ----------------------------------------------------Washer, #10 Internal lock ----------------------------------------Nut, 10-24 Hex -----------------------------------------------------6
1
4
2
2
4
2
1
12
1
2
2
1
1
1
4
14
8
7
7/16 x .028 x 9” 2 pcs
3/8 FG Rod 6” 2 pcs
7/16 x .028 x 39” 4 pcs
Boom 1-1/4 x .035 x 35”
42-1/4”
7/16 x .028 x 14” 2 pcs
#4 hose clamp 12 pcs
11-3/8”
16-1/4
3-3/4”
FULL 12 MONTH 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 MFJ Enterprises, Inc. to be free from 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, canceled check, credit card or
money order receipt, etc.) describing the product to establish the validity of the warranty claim and submit
the original of machine reproduction or 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-ofpurchase. Any evidence of alteration, erasure, or forgery shall be cause to void any and all warranty terms
immediately.
2.
MFJ Enterprises, Inc. agrees to repair or replace at MFJ's option without charge to the original
owner any defective product under warrantee provided the product is returned postage prepaid to MFJ
Enterprises, Inc. with a personal check, cashiers check, or money order for $7.00 covering postage and
handling.
3.
MFJ Enterprises, Inc. will supply 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.
4.
This warranty is NOT void for owners who attempt to repair defective units. Technical
consultation is available by calling (601) 323-5869.
5.
This warranty does not apply to kits sold by 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 product is returned. Wired and tested PC boards installed in the owner's cabinet or
connected to switches, jacks, or cables, etc. sent to MFJ Enterprises, 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 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 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., 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 your dated proof-of-purchase.
12.
This warranty gives you specific rights, and you may also have other rights which vary from state
to state.
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