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The Light Beam Multi-band Antenna

Model LBM - 17M+20M

Installation Instructions

Light Beam Multi-band Antenna Series

Model: LBM-17M+20M

W. A. Freiert – WB2LYL

The Light Beam Multi-band antenna is a compact, computer optimized, directional antenna with good gain and

excellent front to back ratio. The antenna has been optimized for operation at 30 ft above the ground.

Please read these Installation Instructions completely

before beginning installation of your antenna.

Check Your Delivery

Your Light Beam antenna has been shipped in one (1) box. Carefully

inspect the packaging for damage then unpack the antenna and note any

shipping damage. If any damage is found, contact the shipping carrier for

insurance coverage.

Parts Photographs

Boom Components

Quantity

1.5” OD x 48” Tube

1.5” OD x 24” Tube

1.25” OD x 36” Tube

1.25” OD 0.058” x 36” Al. Tube

Note 1 1.125” OD 0.058” x 36” Al. Tube 2

1.0” OD x 48” Tube

1.0” OD 0.058” x 36” Al. Tube

0.75” OD x 12” Tube

0.5” OD x 12” Rod

Note 2 3/4”copper to 1/2” Elbow

Fig. 1

Note 1:

The 1.125” Aluminum Tube is within the

1.250” Aluminum Tube.

Note 2:

The Elbows and associated hardware

are pre-assembled in the 1.25” x 36” Fiberglass

Tubes.

Boom Components

Содержание LBM-17M+20M

Страница 1: ... Light Beam antenna has been shipped in one 1 box Carefully inspect the packaging for damage then unpack the antenna and note any shipping damage If any damage is found contact the shipping carrier for insurance coverage Parts Photographs Boom Components Quantity 1 5 OD x 48 Tube 1 1 5 OD x 24 Tube 2 1 25 OD x 36 Tube 2 1 25 OD 0 058 x 36 Al Tube 2 Note 1 1 125 OD 0 058 x 36 Al Tube 2 1 0 OD x 48 ...

Страница 2: ...ew 8 10 24 x 1 0 SS Machine Screw 16 10 24 x 5 8 SS Machine Screw 2 10 24 SS Anti Vibration Hex Nut 45 10 24 Hex Nut w Tooth Washer 4 No 10 SS Flat Washer 36 OD 25 loop 1 4 20 x SS Eye bolt w Nut 2 1 4 20 SS Anti vibration Nut 2 1 SS Hose Clamp 4 3 4 SS Hose Clamp 8 1 8 No 10 Black Cable Clamp 13 Copper Elbows Boom Hardware 2 Element Tube Lanyards Quantity 1 8 Dacron Cord 4 S S Lanyard Clamps 4 1 ...

Страница 3: ...provide clarity The inclusion of many steps in this document will ensure that you will successfully assemble and install your new antenna Our goal is to have the antenna work correctly the first time out of the box The antenna is built in stages Initial sub assembly can be completed indoors in the comfort of your workspace Final assembly of the sub assemblies to create the finished antenna will be...

Страница 4: ...re insert the 1 0 OD 0 058 x 36 aluminum tube into the left side of the 1 5 OD x 48 fiberglass tube while aligning the smaller aluminum tube within the 1 25 OD aluminum tube installed in the previous step DANGER Antenna Installation If you are installing your antenna on a roof tower or other high structure or will use a ladder or scaffold to access the installation location follow these precaution...

Страница 5: ...ide for use later Fig 8 Fig 9 Boom End Sub Assembly The Front End of the Boom and the Back End of the Boom will be assembled in the following steps Select one of the 1 5 OD x 24 fiberglass tubes one of the 1 250 OD x 36 fiberglass tubes with copper elbow and one of the 1 0 OD x 48 fiberglass tubes Orient the tubes as shown in Fig 10 Note the alignment of the holes and the relative position of each...

Страница 6: ... Rod into the Copper elbow of each Boom End Assembly Note that this is a loose fit Fig 13 Fig 14 Fig 15 Insert a 1 4 20 Eye bolt with 1 4 20 Nut into each of the 0 75 OD x 12 fiberglass tubes as shown in Fig 15 Fasten the Eye bolt to the tube using a 1 4 20 anti vibration Hex Nut Position the Eye bolt as shown in Fig 16 Tighten the anti vibration Hex Nut until the tube deforms slightly Fig 16 Plac...

Страница 7: ...e list on Page 2 Insert the 1 0 OD x 48 fiberglass tube into the 1 25 OD x 48 fiberglass tube and align the holes as shown in Fig 20 Insert a 10 24 x 1 5 Machine Screw and a 10 24 anti vibration nut as shown in Fig 21 Tighten well Place the 1 Stainless Steel Hose Clamp the larger of the two sizes of hose clamp over the slit end of a 1 0 OD x 48 fiberglass tube as shown in Fig 22 Note that the slit...

Страница 8: ...hose clamp screws are above the tubes Note the orientation of both hose clamps Assemble the remaining two Elements as shown in Fig 24 through Fig 27 Complete the following steps for each of the four 4 0 5 x 24 fiberglass rods Select a 10 24 x 1 0 SS Machine Screw a 1 8 No 10 Black Cable Clamp and a 10 24 SS Anti vibration Hex Nut Insert the hardware through the hole of the fiberglass rod as shown ...

Страница 9: ...less Steel Hose Clamp the smaller of the two sizes of hose clamp over the slit end of a 0 75 OD x 48 fiberglass tube Then insert the 0 0 5 OD fiberglass rod into the 0 75 OD tube as shown in Fig 33 Tighten the hose Clamp slightly Repeat the previous step for the remaining 0 75 OD x 48 fiberglass tube and fiberglass rod Insert the 0 5 OD x 48 fiberglass rod into the 0 75 OD x 48 fiberglass tube and...

Страница 10: ... Fig 37 Select one 1 of the Element Mounting Plates and insert two 2 10 24 x 5 8 Machine Screws as shown in Fig 38 Fasten the screws using two 2 10 24 Hex Nuts with Tooth Washer Tighten both fasteners well These fasteners will later become terminals for the 20M Driven Element Wires Select two 2 10 24 x 2 Machine screws and two 2 No 10 SS Flat washers Place one washer on each screw Then insert the ...

Страница 11: ...in the hole shown in Fig 43 Fasten the machine screw with a 10 24 Anti vibration Hex Nut and tighten well Place a No 10 SS Flat Washer over each of two 2 10 24 x 2 0 Machine Screws Insert the screws passing through both the top and bottom Element Mounting Plates as shown in Fig 44 Place a No 10 Flat SS Washer and then a 10 24 Anti vibration Hex Nut over each screw Tighten the fasteners finger tigh...

Страница 12: ...in Fig 47 This completes the assembly of the Driven Element Assembly The Driven Element Wires will be added to this assembly during the final assembly of the antenna Note The orientation of all Hose Clamp Adjustment Screws They are positioned on the outer side of each element facing up Reflector Element Assembly Select the remaining Boom End Sub Assembly and temporarily remove the tube and rod fro...

Страница 13: ...S Flat Washer over each of two 2 10 24 x 2 0 Machine Screws Insert the screws passing through both the top and bottom Element Mounting Plates as shown in Fig 52 Place a No 10 Flat SS Washer and then a 10 24 Anti vibration Hex Nut over each screw Tighten the fasteners finger tight Orient the selected Element Sub Assemblies next to the Boom End Sub Assembly as shown in Fig 53 Note the orientation of...

Страница 14: ...mmended Using a tarp will enhance the retrieval of parts that are accidentally dropped Carefully carry the Assemblies shown in Fig 56 to your new work location Also move all other remaining antenna parts such as remaining hardware RF Wire Assemblies and Lanyards Place the Driven Element Assembly at one end of the outdoor work area Remove the Elastic Band that is holding the Element ends together R...

Страница 15: ...e Driven Element Assembly Place the Reflector Element Assembly in the outdoor workspace Repeat the steps previously used to position the elements of the Driven Element Assembly to position the elements of the Reflector Element Assembly Verify that the elements are square with the Boom End Assembly Tighten all six 6 fasteners well See Fig 61 Place the Boom Center Assembly near the Driven Element As...

Страница 16: ...the Reflector Element Assembly near the Boom Center Assembly and Driven Element Assembly Repeat the previous four 4 steps to fasten the Reflector Element Assembly to the Boom Tighten each fastener well This completes the attachment of the Driven Elements and the Reflector Elements to the complete Boom structures Note The following steps set the initial starting length of the Elements This initial ...

Страница 17: ...rough the bottom of the Element Assembly then through the end of the 0 5 OD Rod of the Spreader Assembly as shown in Fig 68 Fasten with a 10 24 Anti vibration Nut Tighten well Position the Spreader Assembly to be parallel with the Boom Assembly Repeat the previous step to attach the other end of the same Spreader Assembly to the opposite Element Assembly Repeat the previous two 2 steps and attach ...

Страница 18: ...t the other end of the wire from the previous step repeat the previous step to fasten the wire within the Black Cable Clamp located on the other side of the Boom at the Reflector End of the antenna as shown in Fig 73 This completes the installation of the 17M Reflector Element The loose ends of the element will be secured in a later step Select one 1 of the two 2 Wire Assemblies that is labeled 17...

Страница 19: ... of the 17M Driven Element Wire through the ring terminal of the 17M Reflector Element wire as shown in Fig 76 Pull the cord through the ring terminal till the wire tie is against the ring terminal then secure this position with a knot Select one 1 of the 1 8 x 2 Heli tubes and wrap the spiral tube about the cord as shown in Fig 77 Completely wrap the cord with the spiral tube as shown in Fig 78 S...

Страница 20: ...ps with wire and the Hex Nuts on the Machine Screws and tighten well Position the Black Cable Clamps as shown in Fig 79 At the other end of the wire from the previous step repeat the previous step to fasten the wire within the Black Cable Clamps located on the other side of the Boom at the Reflector End of the antenna as shown in Fig 80 On the Reflector Element end of the Boom locate the Black Cab...

Страница 21: ...n Hex Nuts and Black Cable Clamps then insert the wire through both Replace the Black Cable Clamps with wire and the Hex Nuts on the Machine Screws as shown in Fig 83 and tighten well Twist the driven and reflector element wires to remove curl from each wire Pass the black cord that is attached to the ring terminal of the 20M Driven Element Wire through the ring terminal of the 20M Reflector Eleme...

Страница 22: ... wires straighten loosen the 3 4 SS Hose Clamp on one 1 of the Spreader Assemblies and gently extend the 0 5 OD Rod till the wire is straight Do not over tension See Fig 88 Repeat the previous step on the remaining Spreader Assembly Using a soft lead pencil mark the 0 75 OD Tube at the 1 0 OD tube position on each of the Element Assemblies as shown in Fig 89 This mark is a starting point reference...

Страница 23: ...Reflector Element wire is under tension and is straight Do not over tension The element length on both sides of the antenna boom should be equal Note The Element Ends will curve slightly as the wire is tensioned This is normal Extend the right hand 20 M Driven Element a length of 1 0 as shown in Fig 92 Then extend the left hand 20 M Driven Element to the same length Repeat lengthening the right ha...

Страница 24: ...each Lanyard through the SS Eyebolt then back through each Lanyard Clamp as shown in Fig 97 Tighten each Lanyard Clamp until the lanyard is snug yet the lanyard can still be pulled through the clamp Note An ASSISTANT will be required to help during the next step Grasp a Lanyard in each hand Pull both Lanyards equally placing equal tension on both Lanyards so that the Eye Bolt and Tube remain cente...

Страница 25: ... tighten the hose clamp The ends of both Elements should be about 2 to 3 above the ground as shown in Fig 101 If the Element ends are not at the correct height adjust the height of the vertical tube Dress the excess Lanyard by winding the excess upon the Lanyard Secure with a half hitch knot as shown in Fig 102 Repeat this step to dress the other Lanyard excess as shown in Fig 103 Fig 99 Fig 100 F...

Страница 26: ...s ideal but any sturdy Boom to Mast Mount can be used Your new Light Beam Multi band antenna has a 50 Ohm impedance at the center of each amateur band The antenna is a balanced antenna therefore a 1 1 Balun is required to interface your 50 Ohm coaxial cable to the antenna A current balun will perform best Sold Seperately Your favorate 1 1 Balun or Coaxial Choke will also work well The antenna can ...

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