Hy-Gain LJ-113 Manual de usuario

CAUTION: Read All Instructions Before Operating Equipment

308 Industrial Park Road

Starkville, MS 39759 USA

Tel: 662-323-9538 Fax: 662-323-6551

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

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

27 4 places

32 2 places

26 27

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

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

10 MTR 12 MTR

PHONE CW CW

PHONE

Ref

Dir

7/8 x 48

3/4 x 48

5/8 x 40-1/2

T1 T2 T3

106-7/8

97-3/4

39-1/8

48-1/8 49

39-7/8

95-1/4

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.

Ref

Dir

Beta 11 15

Figure 7

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.

21-22-24

21-24-22-24

Refer to chart

Figure 8

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

Boom to mast

bracket

Figure 9

Figure 10

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

PARTS LIST

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 ------------------------------------------

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