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Boom Length, ft (m)                           

35.4 (10.8)

Boom Diameter, in (cm)

2.5 (6.3)

Maximum Mast Diameter OD, in (cm)

2.5 (6.3)

Maximum Wind Survival, mph (kph)

           >90 (>145)

Maximum Wind Surface Area, ft

2

 (m

2

)

9.2 (0.85)

Wind Load @ 80 mph (129 kph), lb (kg)

115 (52.3)

Maximum Power Handling (Watts)

1500

Weight, lb. (kg)

92 (41.8)

Design Safety Factor

1.25

SPECIFICATIONS

Frequency Coverage (Meters)

20

Total number of Elements

5

Free Space Gain (dBi)

9.3

Maximum Front to Back Ratio (dB)

20-30

VSWR Minimum                               

1.1:1

VSWR 1.5:1 Bandwidth (KHz)

350

Longest Element, ft (m)                       

36.3 (11.1)

Turning Radius, ft (m)                       

25.9 (7.9)

Limited Warranty

Cushcraft Corporation, 48 Perimeter Road, Manchester, New Hampshire 03103, warrants to the original consumer purchaser for one year from date of
purchase that each Cushcraft antenna is free of defects in material or workmanship.  If, in the judgement of Cushcraft, any such antenna is defective, then
Cushcraft will, at its option, repair or replace the antenna at its expense within thirty days of the date the antenna is returned (at purchaser's expense) to
Cushcraft or one of its authorized representatives.  This warranty is in lieu of all other expressed warranties. Any implied warranty is limited in duration to
one year.
Cushcraft Corporation shall not be liable for any incidental or consequential damages which may result from a defect.  Some states do not allow a limitation
on how long an implied warranty lasts or exclusions or limitations of incidental or consequential damages, so the above limitation and exclusion may not
apply to you.  This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  This warranty does not extend
to any products which have been subject to misuse, neglect, accident or improper installation.  Any repairs or alterations outside of the Cushcraft factory
will nullify this warranty.

48 Perimeter Road, Manchester NH 03103 USA •  Telephone: 603-627-7877 • Fax: 603-627-1764 • E-mail: [email protected]

Web Site: http://www.cushcraft.com • International - Tel: +1-603-627-7877 • Fax:+1-603-627-1764

COMMUNICATIONS  ANTENNAS

The Electrical Specifications for all Cushcraft Amateur Antennas are derived from numerical analysis and
measured data taken on our test range.  Performance may vary due to the random variables associated
with a specific application or installation.

Summary of Contents for BIG THUNDER XM520

Page 1: ...XM520 20 METER 5 ELEMENT YAGI 951484 11 98 ASSEMBLY INSTALLATION COMMUNICATIONS ANTENNAS ...

Page 2: ...OMMENDED THERE IS A WARNING STICKER WHICH MUST BE ATTACHED TO THE BOOM AS SHOWN IN FIGURE A Plan your installation carefully If you use volunteer helpers be sure that they are qualified to assist you Make certain that everyone involved understands that you are in charge and that they must follow your instructions If you have any doubts at all employ a professional antenna installation company to i...

Page 3: ... 3 cm 8 ____ 024259 1 8 Cable Thimble 3 cm 4 ____ 024623 Turnbuckle 2 ____ 024624 1 8 Cable Clamp 3 cm 12 ____ 030407 5 8 Worm Clamp 1 6 cm 10 ____ 030409 11 16 Worm Clamp 1 7 cm 10 ____ 030410 1 Worm Clamp 2 5 cm 10 ____ 030411 1 1 8 Worm Clamp 2 9 cm 10 ____ 030412 1 1 2 Worm Clamp 3 8 cm 20 ____ 032881 2 1 16 3 Worm Clamp 5 2 7 6 cm 2 ____ 050077 3 8 Black Plastic Cap 0 9 cm 10 ____ 054526 2 1 ...

Page 4: ...BD Aluminum 2 3 8 x 12 2 Tube 6 0 x 30 5 cm BE XM520BE Aluminum 2 3 8 x 60 1 Tube 6 0 x 152 4 cm BF XM520BF Aluminum 2 3 8 x 84 1 Tube 6 0 x 213 4 cm 19 010719 SS Hex 1 4 20 x 3 2 Bolt 7 6 26 054526 Black 2 1 2 2 Plastic Cap 6 3 cm 84 010084 SS Lock 1 4 2 Washer 99 014399 SS Lock 1 4 20 2 Nut 3 See Figure 1D Lay out boom sections as shown in Figure 1A Make sure tube ends are free of debris to allo...

Page 5: ...0082 Hex 1 4 20 x 1 20 Bolt 6 x 2 5 cm 84 010084 SS Lock 1 4 28 Washer 6 cm 85 010085 SS Nut 1 4 20 10 6 cm 99 014399 SS Lock 1 4 28 Nut 6 cm ID Part Description Dimensions Qty 509 324509 Aluminum 4 x 5 1 4 x 3 16 10 Bracket 10 2 x 13 3 x 5 cm 588 014588 SS Hex 1 4 x 3 1 2 8 Bolt 6 x 10 2 cm 592 014592 SS Flat 1 4 1 8 thick 8 Washer 6 x 3 cm 4 Tighten LAST Tighten FIRST Tighten SECOND 99 84 588 99...

Page 6: ...C ED EE EF EB EK EC ED EE EG EB EK EC ED EE EJ EB EK EH 32 81 3 cm 409 407 32 81 3 cm 36 91 4 cm 32 81 3 cm 32 81 3 cm 32 81 3 cm 409 407 32 81 3 cm 36 91 4 cm 32 81 3 cm 32 81 3 cm 32 81 3 cm 409 407 32 81 3 cm 40 101 6 cm 32 81 3 cm 32 81 3 cm 32 81 3 cm 409 407 32 81 3 cm 46 116 8 cm 32 81 3 cm 32 81 3 cm 20 50 8 cm 20 50 8 cm 20 50 8 cm 20 50 8 cm 411 32 81 3 cm 409 407 32 81 3 cm 23 58 4 cm 3...

Page 7: ...10 Tube 2 2 2 5 x 91 4 cm ED X79ED Aluminum 5 8 3 4 x 36 10 Tube 1 6 1 9 x 91 4 cm EE X79EE Aluminum 1 2 x 36 10 Tube 1 3 x 91 4 cm EF X79EF Aluminum 3 8 x 48 6 Tube 9 x 121 9 cm EG XM520EG Aluminum 3 8 x 50 2 Tube 9 x 127 cm EH XM520EH Aluminum 1 3 8 x 24 4 Tube 3 5 x 61 0 cm EJ X79EJ Aluminum 3 8 x 32 2 Tube 9 x 81 3 cm EK XM520EK Aluminum 1 1 8 x 36 10 Tube 2 9 x 91 4 cm 120 6 XM520 Figure 2B 5...

Page 8: ... 2 1 6 3 2 Clamp 5 2 7 6 cm 82 010082 SS Hex 1 4 20 x 1 20 Bolt 6 x 2 5 cm 84 010084 SS Lock 1 4 60 Washer 6 cm 87 014387 SS Lock 8 32 4 Nut 98 014498 Cush a 1 3 8 20 Clamp 3 5 cm 99 014399 SS Lock 1 4 60 Nut 6 cm 707 194707 U Channel 4 x 24 5 Bracket 10 2 x 61 cm MN MNXM Matching 1 Network FL XM520FL Aluminum 5 8 x 85 1 2 2 Strap 1 6 x 217 2 c m FS X79FS Copper 1 2 x 6 2 Braid 1 2 x 15 cm 87 81 8...

Page 9: ...asher 6 cm 85 010085 SS Nut 1 4 20 1 6 cm 99 014399 SS Lock 1 4 20 2 Nut 6 cm 815 154815 Strap 2 x 1 1 2 x1 8 1 Insulator 5 1 x 3 8 x 3 cm 564 324564 Aluminum 1 x 5 1 4 x 1 8 2 Bracket 2 5 x 13 3 x 3 cm Figure 4A Element 3 Element 2 Element 4 Element 5 Element 1 8 XM520 815 FL 99 99 815 82 84 82 84 Figure 4C 82 84 82 84 85 564 Figure 4B ...

Page 10: ...d 5B for assembly of boom to mast clamp Required hardware is listed in the Boom to Mast Clamp Assembly Parts List Form the boom shelf by attaching the lower boom bracket 506 to the mast plate 542 Attach mast plates 542 618 to mast using U bolts 3209 and V blocks 35 Place the boom on the boom shelf during installation Loosely attach the top boom bracket 506 to the mast plate 542 and to the lower bo...

Page 11: ... the turnbuckles Tighten the cable clamps beginning with the clamp closest to the thimble Refer to Figure 1E for attachment of the cable to the boom ends Place a thimble 59 on the 1 4 20 x 1 bolt Place three loose cable clamps 24 onto the cable end Feed the cable end through the element bracket and around the thimble Run the cable back through the cable clamps Tighten the cable to remove the major...

Page 12: ...representatives This warranty is in lieu of all other expressed warranties Any implied warranty is limited in duration to one year Cushcraft Corporation shall not be liable for any incidental or consequential damages which may result from a defect Some states do not allow a limitation on how long an implied warranty lasts or exclusions or limitations of incidental or consequential damages so the a...

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