CUSHCRAFT XM-240 Antenna manual

ASSEMBLY &

INSTALLATION

XM240

40 Meter 2 Element Yagi

COMMUNICATIONS ANTENNAS

951477 (8/98)

XM240

Thank you for your purchase of the Cushcraft XM240 . This kit is designed and manufactured to give the best performance and trouble free service. The antenna will perform as specified if the instructions are followed during assembly and installation. If you have technical questions and have access to the World Wide Web you can visit Cushcraft’s TECHEXPRESS support service (http://www.cushcraft.com). The site enables the user to place parts orders, ask technical questions, locate part numbers, initiate warranty inquires and review Frequently Asked

Questions. Our technical support staff can be reached by phone at (603) 627-7877 (8 AM to 5 PM Eastern time or voice mail after hours), faxed at (603) 627-1764 or can be e-mailed at [email protected].

WARNING

THIS ANTENNA IS AN ELECTRICAL CONDUCTOR. CONTACT WITH POWER LINES CAN RESULT IN DEATH OR SERIOUS INJURY.

DO NOT INSTALL THIS ANTENNA WHERE THERE IS ANY POSSIBILITY OF CONTACT WITH OR HIGH VOLTAGE ARC-OVER FROM

POWER CABLES OR SERVICE DROPS TO BUILDINGS. THE ANTENNA, SUPPORTING MAST AND/OR TOWER MUST NOT BE CLOSE

TO ANY POWER LINES DURING INSTALLATION, REMOVAL OR IN THE EVENT PART OF THE SYSTEM SHOULD ACCIDENTALLY FALL.

FOLLOW THE GUIDELINES FOR ANTENNA INSTALLATION RECOMMENDED BY THE U.S. CONSUMER PRODUCT SAFETY COMMISSION

AND LISTED IN THE ENCLOSED PAMPHLETS.

Antenna System Planning

Before assembly, take time to review your installation plans for the antenna. Location of the antenna is very important. Surrounding objects such as trees, power lines, buildings, and other antennas will interact with an HF Yagi. To minimize the effects of surrounding objects, mount the antenna as high and in the clear as possible. Metallic guy wire within 30 feet of this antenna, if broken with strain insulators, will improve performance.

YOU MUST INSURE THAT NEITHER PEOPLE OR PETS CAN COME IN CONTACT WITH YOUR ANTENNA WHILE IT IS IN

OPERATION. DEADLY VOLTAGES AND CURRENTS MAY EXIST. ALSO, SINCE THE EFFECTS OF EXPOSURE TO RF ARE NOT FULLY

UNDERSTOOD, LONG TERM EXPOSURE TO INTENSE RF FIELDS IS NOT RECOMMENDED. 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 install your antenna.

System Grounding

Direct grounding of the antenna, mast and tower is very important. This serves as protection from lightning strikes and static buildup. A good electrical connection should be made to one or more ground rods directly at the base of the tower or mast using at least #10 AWG ground wire and non-corrosive hardware. For details and safety standards, consult the National Electrical Code. A coaxial lightning arrester should be used.

Cushcraft offers several different models such as the LAC series.

Assembly

The assembly procedure for the XM240 consists of assembling the following subassemblies. 1) Verification of Parts. 2) Boom Assembly.

3) Element Assembly. 4 )X-Hat Assembly. 5) Feed System Assembly. 6) Boom-to-Mast Clamp Assembly. 7)Boom Truss Assembly.

Assembly of the XM240 will be easiest if the preceding steps are performed in the given order.

Please read through the entire assembly procedure before beginning.

1-Verification of Parts

Verify all parts are present by using the XM240 Master Parts List. Check off each part when it is counted. There are extra parts intentionally shipped with this antenna. Place common hardware in temporary containers for ease of assembly. Note all hardware is Stainless Steel.

Part No.

LCA

Description Metric Equivalent

40 Meter Loading Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MNXM Matching Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

XM240BA 2-1/2” x 59-15/16” Aluminum Tube, 6 holes . . . . . . . . . . . . . . . . . . . . . . . . .6.3 x 152.2 cm

XM240BB 2-1/2” x 71-15/16” Aluminum Tube, 6 holes . . . . . . . . . . . . . . . . . . . . . . . . . 6.3 x 182.7 cm

XM240BC 2-1/2” x 59-15/16” Aluminum Tube, 10 holes . . . . . . . . . . . . . . . . . . . . . . . . 6.3 x 152.2 cm

XM240BD 2-3/8” x 12” Aluminum Tube, 8 holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 x 30.5 cm

XM240BE 2-3/8” x 12” Aluminum Tube, 4 holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 x 30.5 cm

XM240EA 1-3/8” X 84” Aluminum Tube slotted both ends . . . . . . . . . . . . . . . . . . . . 3.5 x 213.4 cm

XM240EB 1-1/4” x 48” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . 3.2 x 121.9 cm

XM240EC 1-1/8” x 48” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . 2.9 x 121.9 cm

XM240ED 1” x 32” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 81.3 cm

XM240EF 1/2” x 48” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 121.9 cm

XM240EG 3/8” x 36” Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 x 91.4 cm

4

4

2

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Quantity Qty Check

4

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1

1

1

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1

XM240

010120

010231

011941

013209

014387

014399

014498

030411

030412

050077

054526

094622

124567

170035

190026

190028

014588

014592

014597

024259

024624

024623

030407

030409

194542

194791

194707

290326

324506

324509

Part No.

Description Metric Equivalent

XM240EH 1-38” x 42” Aluminum Tube slotted one end, drilled one end . . . . . . . . . . 3.5 x 106.7 cm

XM240EJ 3/8” x 42” Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.9 x 106.7 cm

X79FS

XHR

010011

6” Feed Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34-1/2” x 3/16” Aluminum Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15.2 cm

.5 x 87.6 cm

#8-32 Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

010082

010084

010085

010207

010208

010209

010719

1/4-20 x 1" Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm - 20 x 2.5 cm

1/4" Stainless Steel Flat Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm

1/4-20 Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm

3/8" Stainless Steel Flat Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm

3/8" Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm

3/8" Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm

1/4”-20 x 3” Stailless Steel Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm

8-32 x 2” Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 cm

8-32 x 1-3/4” Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 cm

#8 Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-7/8" Center-to-center U-Bolt 4" Long . . . . . . . . . . . . . . . . . . . . . . 7.3 cm -10.2 cm Long

#8-32 Stainless Steel Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1/4” Stainless Steel Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm

1-3/8” Cush-a-Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 cm

1/4" x 3-1/2" Stainless Steel Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 x 8.9 cm

1/4" Stainless Steel Flat Washer 1/8" Thick . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 x 0.3 cm

8-32 x 2-3/4” Stainless Steel Mahcine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 cm

1/8” Thimble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 cm

1/8” Cable clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 cm

5/16” x 4” Turnbuckle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 x 10 cm

5/8" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 cm

11/16" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 cm

1-1/8" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 cm

1-1/2" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 cm

3/8" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm

2-1/2" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 cm

30’ Phillystran cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.14m

1" x 8" Drilled Fiberglass Insulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 20.3 cm

2-1/2" Formed Aluminum Vee Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 cm

Element Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Half Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8" x 8" x 1/4" Aluminum Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . 20.3 x 20.3 x 0.6 cm

2” x 4” x 1/8” Drilled aluminum truss bracket . . . . . . . . . . . . . . . . . . . . . 5.1 x 10.2 x 0.3 cm

4” x 24” x 3/16”. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.2 x 61.0 x .5

Danger Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8" x 5-1/4" x 3/16" Drilled Extruded Aluminum Bracket . . . . . . . . . . . . . 20.3 x 13.3 x 0.5 cm

4" x 5-1/4" x 3/16" Drilled Extruded Aluminum Bracket . . . . . . . . . . . . . 10.2 x 13.3 x 0.5 cm

3

8

1

1

8

4

2

8

8

12

2

8

4

2

4

4

2

2

1

1

1

2

4

14

60

4

3

8

2

8

6

8

6

6

32

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Quantity Qty Check

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2

BA

59-15/16”

(152.2 cm)

BD

12”

(30.5 cm)

XM240

BB

Figure 1A

BE

71-15/16 ”

(182.7 cm)

12”

(30.5 cm)

BB

71-15/16 ”

(182.7 cm)

BD

12”

(30.5 cm)

BC

59-15/16”

(152.2 cm)

See Figure 1C

19

84

19

84

99

84

19

19

84

99

Figure 1B

99

1-Boom Assembly

Lay out boom sections as shown in Figure 1A. Secure the two outer connections as shown in Figure1B. The middle connection is made using the mast mounting hardware as shown in Figure 1C.

ID Part #

BA XM240BA

BB XM240BB

BC XM240BC

BD XM240BD

BE XM240BE

19 010719

84 010084

99 014399

Description Dimensions

Aluminum 2-1/2” x 59-15/16”

Tube (6.3 x 152.2 cm)

Aluminum 2-1/2” x 71-15/16”

Tube (6.3 x 182.7 cm)

Aluminum 2-1/2” x 59-15/16”

Tube (6.3 x 152.2 cm)

Aluminum

Tube

Aluminum

Tube

SS Hex

Bolt

SS Lock

Washer

SS Lock

Nut

2-3/8” x 12”

(6.0 x 30.5 cm)

2-3/8” x 12”

(6.0 x 30.5)

1/4-20 x 3”

(7.6)

1/4”

1/4-20

Qty

1

2

1

2

1

8

8

8

3

XM240

542

84

82

4 Places

4 Places

99

ID Part #

82 010082

84 010084

99 014399

506 324506

542 194542

588 014588

Description

Hex

Bolt

SS Lock

Washer

Dimensions

1/4-20 x 1”

(2.5 cm)

Qty

16

SS Lock

Nut

Aluminum

Bracket

Alu Mounting

Plate

1/4”

(0.6 cm)

1/4”

(.6 cm)

18

18

8” x 5-1/4” x 3/16” 2

(20.3 x 13.3 x .5 cm)

8” x 8” x 1/4”

20.3 x 20.3 x .6 cm)

1

SS Hex

Bolt

1/4” x 3-1/2”

(.6 x 8.9 cm)

2

Figure 1C

506

82

4 Places

84

4 Places

BB

588

84

99

4 Places

82

84

588

84

99

506

99

99

506

BB

4

A

B

XM240

2 - Element Assembly

Figure 2A and 2B show the steps required for element assembly. Identify the parts required using the Element Subassembly Parts List. Slide EH sections over fiberglass insulator (567) until #8 screw holes line up (Figure

2B) . Insert screws (120) through holes and secure with lock washer

(941) and nut (11).

Assemble elements referring to Figure 2A. Pay close attention to all dimensions shown. Use Chart A to determine your final element half length adjustments.

Chart A

Element Half Lengths

CW

A

252.5”

7.025 MHz (641.3 cm)

MID

249.5

7.125 MHz (633.7 cm)

PH

246.5

7.225 MHz (626.1 cm)

B

262.5”

(666.7 cm)

258.5

(656.6 cm)

255.5

(649.0 cm)

120

120

941

11

567

41

11

Figure 2B

77

120

407

409

ID

11

26

41

411

412

030411

030412

567 124567

EA XM240EA

EB XM340EB

EC XM240EC

ED XM240ED

EF XM240EF

EG XM240EG

EH XM240EH

EJ XM240EJ

LCA LCA

Part #

010011

290326

011941

050077

010120

030407

030409

Description

SS Nut

Warning

Sticker

SS Lock

Washer

Black

Plastic Cap

SS Machine

Screw

Worm

Clamp

Worm

Clamp

Worm

Clamp

Worm

Clamp

Fiberglass

Insulator

Aluminum

Tube

Aluminum

Tube

Aluminum

Tube

Aluminum

Tube

Aluminum

Tube

Aluminum

Tube

Aluminum

Tube

Aluminum

Tube

Loading

Coil

Dimensions

#8-32

#8

3/8’

(0.9 cm)

#8-32 x 2”

(5.1 cm)

5/8”

(1.6 cm)

11/16”

(1.7 cm)

1-1/8’

(2.9 cm)

1-1/2”

(3.8 cm)

1” x 8”

(2.5 x 20.3)

1-3/8” x 84”

(3.5 x 213.4 cm)

1-1/4” x 48”

(3.2 x 121.9 cm)

1-1/8” x 48”

(2.9 c 121.9 cm)

1” x 32”

(2.5 x 81.3 cm)

1/2” x 48”

(1.3 x 121.9 cm)

3/8” x 36”

(.95 x 91.4 cm)

1-3/8” x 42”

(3.5 x 106.7 cm)

3/8 x 42”

(.95 x 106.7 cm)

Qty

2

1

2

2

2

4

2

8

4

8

8

1

1

4

4

4

4

2

4

26

EA

EH

412

160”

(406.5 cm)

412

EB

EC

411

ED

411

45”

(114.5 cm)

44”

(111.8 cm)

29”

(73.7 cm)

412

160”

(406.5 cm)

412

EB

Element Half Length

EC

411

ED

411

45”

(114.5 cm)

44”

(111.8 cm)

29”

(73.7 cm)

LCA

Figure 2A

407

409

EF EG

77

A

18-1/2”

(47.0 cm)

46”

(116.8 cm)

LCA

409

EF

18-1/2”

(47.0 cm)

46”

(116.8 cm)

407

EJ

77

B

XM240

3 - X-Hat Assembly

Figure 3A shows the steps for assembly of the four X-Hats. Identify the parts required using the X-Hat Subassembly Parts List. Two XHR rods attach to each 40 meter coil (LCA). The rods may be mounted in any position relative to the element or boom.

31

XHR

28

26

87

XHR

28

26

87

LCA

Figure 3A

ID Part #

31 010231

87 014387

26 190026

28 190028

XHR

Description

SS Machine

Screw

SS Lock

Nut

Aluminum

Bracket

Aluminum

Half Washer

Aluminum

Rod

Dimensions

#8-32 x 1-3/4”

(4.4 cm)

#8-32

Qty

4

4

4

3/8” x 34-1/2”

(1.0 x 87.6 cm)

4

4

31

6

XM240

4 - Element to Boom Assembly

Figure 4A, 4B and 4C show the steps for element mounting on the XM240 boom. Identify the parts required using the Element to Boom

Subassembly Parts List. Attach the two brackets (509) to the boom using the hardware shown. The end of the truss assembly is sh own in Figure 4A but is not to be assembled at this time. Attach the U-Channel Plate (793). Attach elements using 4 Cush-a-Clamps (98)

(Figure 5A). The element pictured in Figure 5A is the Driven Element. Both elements mount with the same hardware.

Figure 4A

82

82

84

84

82

84

82

84

509

592

85

85

Leave out until Step #9

99

99

99

92

99

99

84

99

82

Figure 4C

Tighten Last

99

Tighten First

84

Tighten Second

707

Figure 4B

84

588

82

7

97

41

XM240

41

97

Figure 5A

ID Part #

41 011941

82 010082

84 010084

85 010085

87 014387

97 014597

98 014498

99 014399

212 010212

509 324509

588 014588

592 014592

707 194707

MN MNXM

FS X79FS

87

Description Dimensions

SS Lock

Washer

#8

SS Hex

Bolt

SS Lock

Washer

SS Nut

1/4-20 x 1”

(.6 x 2.5 cm)

1/4”

(.6 cm)

1/4-20

(.6 cm)

#8-32 SS Lock

Nut

SS Machine

Screw

Cush-a

Clamp

SS Lock

Nut

8-32 x 2-3/4

(7.0 cm)

1-3/8”

(3.5 cm)

1/4”

(.6 cm)

SS Hex

Bolt

1/4-20 x 2”

(5.1 cm)

Aluminum 4” x 5-1/4 x 3/16”

Bracket (10.2 x 13.3 x .5 cm)

Qty

4

7

22

2

4

2

6

22

2

2

SS Hex

Bolt

SS Flat

Washer

U-Channel

Bracket

Matching

Network

Copper

Braid

1/4” x 3-1/2”

(.6 x 10.2 cm)

1/4” (1/8” thick)

(.6 x .3 cm)

4” x 24”

(10.2 x 61 cm)

1/2” x 6”

(1.2 x 15 cm)

1

2

1

1

2

MN

87

X79FS

87

1”

(2.5 cm)

87

87

87

84

99

99

84

97

5 - Feed System Assembly

Figure 5A shows the steps for feed system assembly. Identify the parts required using the Feed System Subassembly Parts List. Attach the

Matching Network (MN) to the boom as shown above. Attach the Feed

Straps (FS) to the two screws on the MN and the two driven element screws with the hardware shown. Position the Feed Straps away from the U-Channel bracket (707).

8

209

XM240

35

Leave 3’ (91 cm) of mast above the antenna to accommodate truss assembly.

209

207

208

207

208

209

Figure 6A

208

209

207

326

208

209

207

35

209

6-Boom to Mast Clamp

Assembly

The antenna is now ready to be mounted to the mast. Attach the antenna mast clamp assembly to the tower mast as shown in Figure

6A. Secure the U-bolts with the hardware shown.

Attach good quality coax with a PL-259 connector to the MNXM matching network. Form a drip-loop with the coax and secure the coax to the boom. Insure PL-259 connector is waterproofed with a good quality sealant after it is attached to the matching network.

ID Part #

35 170035

207 010207

208 010208

209 010209

326 290326

209 013209

Description

Aluminum

V-Block

SS Flat

Washer

SS Lock

Washer

SS

Nut

Danger

Label

U-Bolt

Dimensions Qty

2-1/2”

(6.3 cm)

2

4 3/8”

(.95 cm)

3/8”

(.95 cm)

4

3/8”

(.95 cm)

4

1

2-7/8”

(7.3 cm)

2

9

XM240

209

208

207

23 59

209

208

207

24

7 - Boom Truss

Assembly

24

Figure 9 illustrates the boom truss assembly. Refer to the boom truss assembly parts list for the hardware required. The XM240 uses Phillystran® cable to guy the boom. The cable is one continuous piece from one boom end to the other. Note the

Phillystran cable safety loop that goes around

24 the mast truss bracket.

2”

(5.1 CM) 59

23

91

Figure 7A

24

24

Load bearing strand lays in bottom of saddle.

22

SAFETY

LOOP

Bottom of saddle

Attach the truss bracket (91) to the mast 3 feet (1m) above the boom to mast clamp using the

3/8" hardware provided. Position the truss bracket on the same side of the mast as the boom to mast clamp. Unscrew the turnbuckle ends until there is 1/2" (1.2

cm) of thread remaining. Place the jaw of each turnbuckle (23) into the holes of the truss bracket. Place a thimble (59) on the eye of each turnbuckle. Place three loose cable clamps (24) onto the cable end. Reference Figure 9 and place the cable clamp saddle over the load bearing cable. The load bearing cable is the cable that attaches to the boom end. Feed the cable through a turnbuckle eye. Run the cable back through the cable clamps. Place three additional cable clamps on the end of the cable. Feed the cable through the other turnbuckle eye. Run the cable back through the cable clamps. Feed enough cable through these parts until the center of the Phillystran cable coil is located at the truss bracket. Insure there is enough slack in the cable to form a loose safety loop between the turnbuckles. Tighten the cable clamps beginning with the clamp closest to the thimble.

ID

35

Part #

22 094622

24 024624

23 024623

91 194791

35 170035

59 024259

207 010207

208 010208

209 010209

3209 013209

3209

Description

Phillystran

Cable

Cable

Clamp

Turnbuckle

Truss

Bracket

Aluminum

V-Block

Thimble

SS Flat

Washer

SS Lock

Washer

SS Nut

U-Bolt

Dimensions Qty

1/8” x 30’

(.3 x 9.1m)

1

1/8”

(.3 cm)

5/16”-4”

(.79-10.2 cm)

2” x 42” x 1/8”

(5.1 x 10.2 x .3 cm)

12

2

1

1 2-1/2”

(6.3 cm)

1/8”

(.3 cm)

4

3/8”

(.95 cm)

3/8”

(.95 cm)

3/8”

(.95 cm)

2-7/8”

(7.3 cm)

2

2

2

1

Refer to Figure 4B 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 majority of the sag from the boom. Space the cable clamps 2 inches (5.1 cm) apart. Insure the load bearing cable is seated in the cable clamp saddle as shown above. Tighten the cable clamps beginning with the clamp closest to the thimble. Cut off excess cable 2” (5.1 cm) after the third cable clamp.

Adjust each turnbuckle to bring each boom end level with the center. Phillystran cable has a minimal amount of stretch over time. A safety wire can be placed through the turnbuckle openings to keep the turnbuckles from unscrewing.

Tuning Procedure

The XM240 may be tuned for operation in the 40 meter band according to Chart A in Section 2. Adjust element EJ on the reflector and element

EG on the radiator to set the desired half length referred to in Chart A.

10

SPECIFICATIONS

Frequency Coverage (Meters)

Total number of Elements

Free Space Gain (dBi)

Maximum Front to Back Ratio (dB)

VSWR Minimum

VSWR 1.5:1 Bandwidth (KHz)

2:1 Bandwidth (KHz)

Longest Element, ft (m)

Turning Radius, ft (m)

40

2

6

28

1.1:1

150

250

43.75 (13.3)

24 (7.3

Boom Length, ft (m)

Boom Diameter, in (cm)

Maximum Mast Diameter OD, in (cm)

Maximum Wind Survival, mph (kph)

Maximum Wind Surface Area, ft

2

(m

2

)

Maximum Power Handling (KW)

Weight, lb. (kg)

Design Safety Factor

22 (6.7)

2-1/2 (6.35)

2-1/2 (6.35)

90 (145)

5.5 (.51)

2

55 (25)

1.25

COMMUNICATIONS ANTENNAS

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

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.