Hy-Gain LJ-113 Bedienungsanleitung
CAUTION: Read All Instructions Before Operating Equipment
308 Industrial Park Road
Starkville, MS 39759 USA
Tel: 662-323-9538 Fax: 662-323-6551
COPYRIGHT 2012 Hy-gain.
VERSION 1A C
LJ-113
3 element beam for 10 or 12 meters
INSTRUCTION MANUAL
GENERAL DESCRIPTION
This model is a 3-element beam tunable for maximum forward gain over the entire 10 or 12
meter band. Both the antenna and the beta match are adjustable for maximum performance. The
elements are made of aircraft grade aluminum. The bracket will fit up to a 2 inch diameter mast.
The electrical hardware is made from super strength stainless steel and all element tubing clamps
are stainless steel.
This antenna is designed for use with a 50 ohm coaxial cable. A RG-213/u coaxial cable is
recommended for lower losses and higher power handling capabilities. The antenna requires a
coaxial choke (or balun) to prevent the unbalanced current from flowing down the transmission
line and affecting the efficiency and match of the antenna.
VSWR AND FEEDLINE
UNPACKING
Unpack the antenna and check the parts against the Parts List and the drawings. This will simplify
the antenna assembly.
WARNING
WHEN INSTALLING YOUR SYSTEM, TAKE EXTREME
CARE TO AVOID ANY ACCIDENTAL CONTACT WITH
POWERLINES OR OVERHEAD OBSTRUCTIONS.
FAILURE TO EXERCISE THIS CARE COULD RESULT
IN SERIOUS OR FATAL INJURY
2
BOOM-TO-MAST ASSEMBLY
Select the boom to mast bracket and clamp and install it on the boom as shown in figure 1.
Use only the four outside holes, the elongated inside holes will be used for the U-bolts.
The boom sections should meet in the middle of the bracket.
Figure 1 Figure 2
ELEMENT-TO-BOOM BRACKET
Select a set of small sized element to boom brackets and loosely assemble them on one
end of the boom. Refer to Figure 2 for a assembly detail of the bracket. Do not forget the
1/4 x 3/8 anchor bolt and its associated square nut. This will be the reflector end of the boom.
INSTALLATION OF CLAMPS
When installing the clamps, place the
clamp near then tube with the top of
the clamp centered over one of the
slots in the tube as shown in Figure 3.
Figure 3
33-34
29-30
13
12
2
27 4 places
32 2 places
2
26 27
31
29
30
26
9
3
R1 ASSEMBLY
Select the R1 section of tubing and slip the un-slotted end into the bracket assembled on the
boom. Tighten the bolts enough to hold the elements securely but do not tighten the anchor
bolts at this time. Adjust the bracket until it is a few inches from the end of the boom and will
lie in a plane horizontal to the earth when the antenna is mounted on the mast. Snug the bolts
untill the element will remain in place. Exact placement will be determined by the frequency
you chose to operate. Refer to the frequency chart for placement and tighten the bolts when
the correct location is found.
R2 ASSEMBLY
Select the R2 sections and slip the un-slotted ends into the R1 sections. Allow at least 2 inch
of over lap between the tubes and install the #6 hose clamp and tighten.
R3 ASSEMBLY
Select the R3 sections and slip them into the R2 sections. The total element length may be
adjusted by sliding the R3 in or out of the R2 sections. Refer to the chart to adjust the total
element to the correct length. Install the hose clamps and tighten.
Figure 4
Assemble both sides at
the same time.
t i o r
Total element lengh = t p t cente of boom
Figure 5
5
3
4
16
16
5
5
R1
R2
R3
4
DRIVEN ELEMENT ASSEMBLY
Select the large size set of element-to-boom brackets and loosely assemble these
brackets on the boom in the approximate location according to the assembly chart.
Select the driven element insulators and the DE1 sections of tubing. Slide the
insulator on to the un-slotted end of the R1 (5) sections. Slip the insulated ends into
the bracket assembled on the boom. Tighten the bolts to hold the element securely
but do not tighten the anchor bolts at this time. Carefully check the measurement
from the center of the reflector bracket to the center of the driven element bracket.
Make certain the driven element will lie in the same plane as the reflector then tighten
the anchor bolts securely.
Select the R2 section and slip them into the R1 section. Overlap the tubing at least
2 inches and install the hose clamp and tighten. Select the R3 section of tubing and
slip it into the R2 section. Refer to the chart for the total length of the driven element.
Install the hose clamp and tighten.
DIRECTOR ELEMENT ASSEMBLY
Install the director using the same assembly method as the reflector. Refer to the chart
for total length of the element and location.
Figure 6
31
29
30
26
8
19
5
16
27
26
5
A
B
C
E
D
A
B
C
D
E
10 MTR 12 MTR
PHONE CW CW
PHONE
Ref
DE
Dir
7/8 x 48
3/4 x 48
5/8 x 40-1/2
T1 T2 T3
106-7/8
97-3/4
94
39-1/8
48-1/8 49
39-7/8
95-1/4
99
108-1/8 121-1/2
111-1/8
107
44-3/4
55-1/8
121-5/8
111-3/8
107-1/8
44-7/8
55-1/4
All measurements are in inches and may vary with mounting location and height above
ground. Note that most tubing will be longer than needed for the measurements given.
Overlaping the inner sections as much as possible will lessen the weight present at the
tips of the element and lower the moment of the antenna.
T1
T1
T2
T2
T3
T3
Ref
DE
Dir
F
Beta 11 15
Figure 7
6
BETA MATCH
Select the beta rods, the beta clamps and the 7/8 tubing clamps. Assemble the
beta match as shown in Figure 8. Adjust the beta match “F” dimension measured
from the inside edge of the driven element to the inside edge of the beta clamp as
shown. Tighten all screws securely.
FINAL ASSEMBLY
A balun is not required for normal operation of this antenna. However there are three
recommended feedpoint configurations. one which utilizes the Hy-gain Model BN-86
balun for increased performance and convenience. Final tuning may be required as
the element lengths will vary based on mounting location and height above ground.
Use a good SWR analyzer such as the MFJ-259 or a quality wattmeter to verify the
tuning of the antenna before mounting it in its final location. If the resonance point of
the antenna is too high, then the elements are too short. If it is too low then the
elements are too long. If the resonance point is in the correct place but the SWR is
higher than it should be, then dimension F on the Beta match in Figure 8 should be
adjusted to lower the SWR.
F
21-22-24
21-24-22-24
Refer to chart
Figure 8
7
The first feedpoint configuration involves connection of the coaxial feedline directly to the
driven element. The recommended feedline is RG-213/U. Other types of 50 ohm coaxial
cable may be used if proper selection and careful assembly are utilized. The feedline
should be stripped as shown in figure 10. Attach solder lugs (not supplied) to the center
conductor and shield for easy connection to the driven element.
The second feedpoint configuration involves construction and installation of a homemade
RF choke. (Figure 9)The RF choke ill prevent Rf from flowing on the outside of the coaxial
shield. This will block radiation from the coaxial feedline, thereby reducing the risk of TVI and
preventing radiation pattern degradation. Wind the RF choke from RG-213/U (or equivalent)
coaxial cable. The choke should consist of 12 turns with an inside coil diameter of 6 inches.
Allow enough cable at the end to reach from the mast to the driven element. Strip the coaxial
cable as shown in figure 10. Attach solder lugs ( not included) to the center conductor and
s h i e l d f o r e a s y c o n n e c t i o n t o t h e d r i v e n e l e m e n t .
The third feedpoint configuration involves using a 50 ohm 1:1 balun to connect the feedline
to the driven element. A balun will act as an RF choke and will balance the flow of current
on the driven element, resulting in a symmetrical radiation pattern. A balun will also have a
coaxial connector, providing more convenience than a coax splice. Follow the instructions
supplied with the balun for connection to the antenna.
RF Choke: 12 turns of
RG-8/U with a six inch
diameter. For optimum
performance, use a
Hy-gain BN-86 balun in
Place of the choke.
Tape
Tape
Boom to mast
bracket
Figure 9
Figure 10
8
INSTALLATION AND GROUNDING
The antenna is now ready to be mounted on your mast. This antenna may be mounted
vertical or horizontal. If you choose to mount the antenna vertical, it is strongly suggested that
you drill the lower elements at their junction and install screws in addition to the hose clamps.
This will prevent the elements from falling if they become loose. You must also install the
element brace on the lower element closest to the boom. This will prevent the element from
swaying which may cause the SWR to change.
A proper ground consist of a ½”x 8’ copper-clad ground rod driven into the ground 12
inches from the base of the supporting structure.
Connect the ground rod to the supporting structure using a #8 or larger copper wire
and commercial non-corrosive ground clamps.
WEATHERPROOFING
Weatherprooof the coax connectors using Coax-Seal or similar substance (not supplied).
Securely tape the RF chokke and feedline to the antenna boom. Later when the antenna
is mounted on the mast, the RF choke should be taped to the mast.
Place a Caplug on the end of each boom.
Place a Caplug on the end of each element.
Plastic insulator Metal spacer
7/16 clamp
1-3/4 clamp
mast clamp
mast
Driven
element
21-22-24
Figure 11
21-22-24
21-22-24
37
36
35
38
9
PARTS LIST
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
174996
190004
174865
190206
165138
165141
172267
385142-1
385144-1
871988
163312
166084
745-3106S
656S-0375S-A
455630
463767
475639
504069
565697
554071
500156
505266
562961
554099
551367
540067
564792
555747
161855
161851
465416
169339-0
Boom, 1-1/4 .058 x 55 ---------------------------------------------
R2, 5/8” x 24”, swaged----------------------------------------------
R3, 7/16” x 48” --------------------------------------------------------
R1, 7/8” x 55” --------------------------------------------------------
Bracket #1 element to boom 1-1/4 x 1-1/4---------------------
Bracket #2 element to boom 1-1/4 x 7/8------------------------
Beta match rod 20”--------------------------------------------------
Boom to mast bracket-----------------------------------------------
Clamp, boom to mast bracket-------------------------------------
PARTS PACK LJ-113 -----------------------------------------------
Clamp, 7/8 tubing----------------------------------------------------
Clamp, beta-----------------------------------------------------------
#6 Hose clamp-------------------------------------------------------
Screw #6 x 3/8 self tapping --------------------------------------
Caplug, 1-1/4---------------------------------------------------------
Insulator, driven element------------------------------------------
Caplug, 7/16 --------------------------------------------------------
Bolt, #10-24 x 1”, hex head--------------------------------------
Lockwasher, #10 internal-----------------------------------------
Nut, #10-24, hex-----------------------------------------------------
Bolt, 1/4-20 x 3/8”, hex head-------------------------------------
Bolt, 1/4-20 x 3/4”, hex head-------------------------------------
Lock washer, 1/4”, internal----------------------------------------
Nut, 1/4”, hex --------------------------------------------------------
Nut, 1/4”, square----------------------------------------------------
U-bolt, 5/16” x 2” x 3-5/8”-----------------------------------------
Lockwasher 5/16”, split--------------------------------------------
Nut, 5/16”-18, hex---------------------------------------------------
Clamp, 1-3/8 --------------------------------------------------------
Clamp, 7/16 ---------------------------------------------------------
Insulator, element brace -----------------------------------------
Spacer, element brace ------------------------------------------
2
6
6
6
2
4
2
1
1
1
2
2
12
12
2
2
6
12
9
14
6
28
28
28
6
2
4
4
1
1
1
1
10
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