Cushcraft XM240 Instructions 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
enables the user to place parts orders, ask technical questions, locate part numbers, initiate warranty inquires and review

Questions

at [phone] or can be e-mailed at

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 INSTALLA TION 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.

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

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.

. Our technical support staff can be reached by phone at [phone] (8 AM to 5 PM Eastern time or voice mail after hours), faxed

[e-mail].

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

TECHEXPRESS

. Plan your installation carefully. If you use volunteer helpers be sure that

support service (http://www.cushcraft.com). The site

Frequently Asked

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.

procedure before beginning.

Please read through the entire assembly

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. Description Metric Equivalent Quantity Qty Check

LCA 40 Meter Loading Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ____

MNXM Matching Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ____

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

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

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

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

XM240BE 2-3/8” x 12” Aluminum Tube, 4 holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 x 30.5 cm 1 ____

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

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

XM240EC 1-1/8” x 48” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . 2.9 x 121.9 cm 4 ____

XM240ED 1” x 32” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 81.3 cm 4 ____

XM240EF 1/2” x 48” Aluminum Tube slotted one end . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 121.9 cm 4 ____

XM240EG 3/8” x 36” Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 x 91.4 cm 2 ____

1

XM240

Part No. Description Metric Equivalent Quantity Qty Check

XM240EH 1-38” x 42” Aluminum Tube slotted one end, drilled one end . . . . . . . . . . 3.5 x 106.7 cm 2 ____

XM240EJ 3/8” x 42” Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 x 106.7 cm 2 ____

X79FS 6” Feed Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.2 cm 2 ____

XHR 34-1/2” x 3/16” Aluminum Rod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 x 87.6 cm 8 ____

010011 #8-32 Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ____

010082 1/4-20 x 1" Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm - 20 x 2.5 cm 32 ____

010084 1/4" Stainless Steel Flat Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm 60 ____

010085 1/4-20 Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm 4 ____

010207 3/8" Stainless Steel Flat Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 6 ____

010208 3/8" Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 6 ____

010209 3/8" Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 6 ____

010719 1/4”-20 x 3” Stailless Steel Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm 8 ____

010120 8-32 x 2” Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 cm 2 ____

010231 8-32 x 1-3/4” Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 cm 8 ____

011941 #8 Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4____

013209 2-7/8" Center-to-center U-Bolt 4" Long . . . . . . . . . . . . . . . . . . . . . . 7.3 cm -10.2 cm Long 3 ____

014387 #8-32 Stainless Steel Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 ____

014399 1/4” Stainless Steel Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm60____

014498 1-3/8” Cush-a-Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 cm 8 ____

014588 1/4" x 3-1/2" Stainless Steel Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 x 8.9 cm 4 ____

014592 1/4" Stainless Steel Flat Washer 1/8" Thick . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 x 0.3 cm 2 ____

014597 8-32 x 2-3/4” Stainless Steel Mahcine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0 cm 2 ____

024259 1/8” Thimble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 cm 4 ____

024624 1/8” Cable clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 cm 12 ____

024623 5/16” x 4” Turnbuckle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 x 10 cm2____

030407 5/8" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 cm 8 ____

030409 11/16" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 cm 4 ____

030411 1-1/8" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 cm 8 ____

030412 1-1/2" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 cm 8 ____

050077 3/8" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 4 ____

054526 2-1/2" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 cm 2 ____

094622 30’ Phillystran cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9.14m 1 ____

124567 1" x 8" Drilled Fiberglass Insulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 20.3 cm 1 ____

170035 2-1/2" Formed Aluminum Vee Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 cm 3 ____

190026 Element Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ____

190028 Half Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ____

194542 8" x 8" x 1/4" Aluminum Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . 20.3 x 20.3 x 0.6 cm 1 ____

194791 2” x 4” x 1/8” Drilled aluminum truss bracket . . . . . . . . . . . . . . . . . . . . . 5.1 x 10.2 x 0.3 cm 1 ____

194707 4” x 24” x 3/16”. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10.2 x 61.0 x .5 2 ____

290326 Danger Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ____

324506 8" x 5-1/4" x 3/16" Drilled Extruded Aluminum Bracket . . . . . . . . . . . . . 20.3 x 13.3 x 0.5 cm 2 ____

324509 4" x 5-1/4" x 3/16" Drilled Extruded Aluminum Bracket . . . . . . . . . . . . . 10.2 x 13.3 x 0.5 cm 4 ____

2

XM240

Figure 1A

BA

59-15/16”

(152.2 cm)

84

19

BD

12”

(30.5 cm)

84

19

BB

71-15/16 ”
(182.7 cm)

See Figure 1C

19

84

99

Figure 1B

84

19

99

BE

12”

(30.5 cm)

99

BB

71-15/16 ”
(182.7 cm)

BD

12”

(30.5 cm)

BC

59-15/16”

(152.2 cm)

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 # Description Dimensions Qty

BA XM240BA Aluminum 2-1/2” x 59-15/16” 1

BB XM240BB Aluminum 2-1/2” x 71-15/16” 2

BC XM240BC Aluminum 2-1/2” x 59-15/16” 1

BD XM240BD Aluminum 2-3/8” x 12” 2

BE XM240BE Aluminum 2-3/8” x 12” 1

19 010719 SS Hex 1/4-20 x 3” 8

84 010084 SS Lock 1/4” 8

99 014399 SS Lock 1/4-20 8

3

Tube (6.3 x 152.2 cm)

Tube (6.3 x 182.7 cm)

Tube (6.3 x 152.2 cm)

Tube (6.0 x 30.5 cm)

Tube (6.0 x 30.5)

Bolt (7.6)

Washer

Nut

XM240

82

4 Places

542

99

84

4 Places

Figure 1C

506

82

4 Places

ID Part # Description Dimensions Qty

82 010082 Hex 1/4-20 x 1” 16

84 010084 SS Lock 1/4” 18

99 014399 SS Lock 1/4” 18

506 324506 Aluminum 8” x 5-1/4” x 3/16” 2

542 194542 Alu Mounting 8” x 8” x 1/4” 1

588 014588 SS Hex 1/4” x 3-1/2” 2

Bolt (2.5 cm)

Washer (0.6 cm)

Nut (.6 cm)

Bracket (20.3 x 13.3 x .5 cm)

Plate 20.3 x 20.3 x .6 cm)

Bolt (.6 x 8.9 cm)

84

4 Places

588

84

99

4 Places

BB

99

82

84

99

588

99

84

506

BB

506

4

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

AB

CW 252.5” 262.5”

7.025 MHz (641.3 cm) (666.7 cm)
MID 249.5 258.5

7.125 MHz (633.7 cm) (656.6 cm)

PH 246.5 255.5

7.225 MHz (626.1 cm) (649.0 cm)

120

120

567

941

Figure 2B

11

41

11

ID Part # Description Dimensions Qty

11 010011 SS Nut #8-32 2

26 290326 Warning 1

41 011941 SS Lock #8 2

77 050077 Black 3/8’ 4

120 010120 SS Machine #8-32 x 2” 2

407 030407 Worm 5/8” 8

409 030409 Worm 11/16” 4

411 030411 Worm 1-1/8’ 8

412 030412 Worm 1-1/2” 8

567 124567 Fiberglass 1” x 8” 1

EA XM240EA Aluminum 1-3/8” x 84” 1

EB XM340EB Aluminum 1-1/4” x 48” 4

EC XM240EC Aluminum 1-1/8” x 48” 4

ED XM240ED Aluminum 1” x 32” 4

EF XM240EF Aluminum 1/2” x 48” 4

EG XM240EG Aluminum 3/8” x 36” 2

EH XM240EH Aluminum 1-3/8” x 42” 2

EJ XM240EJ Aluminum 3/8 x 42” 2

LCA LCA Loading 4

Sticker

Washer

Plastic Cap (0.9 cm)

Screw (5.1 cm)

Clamp (1.6 cm)

Clamp (1.7 cm)

Clamp (2.9 cm)

Clamp (3.8 cm)

Insulator (2.5 x 20.3)

Tube (3.5 x 213.4 cm)

Tube (3.2 x 121.9 cm)

Tube (2.9 c 121.9 cm)

Tube (2.5 x 81.3 cm)

Tube (1.3 x 121.9 cm)

Tube (.95 x 91.4 cm)

Tube (3.5 x 106.7 cm)

Tube (.95 x 106.7 cm)

Coil

A

B

26

EA

EH

412

412

160”

(406.5 cm)

EB

45”

(114.5 cm)

160”

(406.5 cm)

EB

45”

(114.5 cm)

412

EC

44”

(111.8 cm)

Element Half Length

412

EC

44”

(111.8 cm)

411

411

411

ED

29”

(73.7 cm)

411

ED

29”

(73.7 cm)

Figure 2A

LCA

18-1/2”

(47.0 cm)

LCA

18-1/2”

(47.0 cm)

409

EF EG

46”

(116.8 cm)

409

EF EJ

46”

(116.8 cm)

407

77

A

407

B

77

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.

ID Part # Description Dimensions Qty

28

31

XHR

26

31 010231 SS Machine #8-32 x 1-3/4” 4

87 014387 SS Lock #8-32 4

26 190026 Aluminum 4

28 190028 Aluminum 4

XHR Aluminum 3/8” x 34-1/2” 4

87

Screw (4.4 cm)

Nut

Bracket

Half Washer

Rod (1.0 x 87.6 cm)

XHR

31

LCA

Figure 3A

26

87

28

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 shown
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

82

82

84

Figure 4B

99

84

84

99

509

85

Leave out
until Step #9

592

85

99

99

92

99

84

588

Figure 4C

99

84

99

82

Tighten Last

Tighten First

84

Tighten Second

707

82

7

41

XM240

97

97

Figure 5A

41

87

ID Part # Description Dimensions Qty

41 011941 SS Lock #8 4

82 010082 SS Hex 1/4-20 x 1” 7

84 010084 SS Lock 1/4” 22

85 010085 SS Nut 1/4-20 2

87 014387 SS Lock #8-32 4

97 014597 SS Machine 8-32 x 2-3/4 2

98 014498 Cush-a 1-3/8” 6

99 014399 SS Lock 1/4” 22

212 010212 SS Hex 1/4-20 x 2” 2

509 324509 Aluminum 4” x 5-1/4 x 3/16” 2

588 014588 SS Hex 1/4” x 3-1/2” 1

592 014592 SS Flat 1/4” (1/8” thick) 2

707 194707 U-Channel 4” x 24” 1

MN MNXM Matching 1

FS X79FS Copper 1/2” x 6” 2

Washer

Bolt (.6 x 2.5 cm)

Washer (.6 cm)

(.6 cm)

Nut

Screw (7.0 cm)

Clamp (3.5 cm)

Nut (.6 cm)

Bolt (5.1 cm)

Bracket (10.2 x 13.3 x .5 cm)

Bolt (.6 x 10.2 cm)

Washer (.6 x .3 cm)

Bracket (10.2 x 61 cm)

Network

Braid (1.2 x 15 cm)

MN

87

1”

(2.5 cm)

87

87

87

X79FS

87

99

84

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).

99

84

97

8

209

XM240

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

35

207

207

209

208

209

208

207

Figure 6A

209

208

326

209

208

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 # Description Dimensions Qty

35 170035 Aluminum 2-1/2” 2

207 010207 SS Flat 3/8” 4

208 010208 SS Lock 3/8” 4

209 010209 SS 3/8” 4

326 290326 Danger 1

209 013209 U-Bolt 2-7/8” 2

V-Block (6.3 cm)

Washer (.95 cm)

Washer (.95 cm)

Nut (.95 cm)

Label

(7.3 cm)

9

XM240

209

7 - Boom Truss
Assembly

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
the mast truss
bracket.

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.

2”

(5.1 CM)

22

24

59

24

24

SAFETY

LOOP

209

208

207

Figure 7A

23

Load bearing
strand lays in

bottom of saddle.

Bottom of saddle

208

207

91

35

23

3209

59

24

24

ID Part # Description Dimensions Qty

22 094622 Phillystran 1/8” x 30’ 1

24 024624 Cable 1/8” 12

23 024623 Turnbuckle 5/16”-4” 2

91 194791 Truss 2” x 42” x 1/8” 1

35 170035 Aluminum 2-1/2” 1

Cable (.3 x 9.1m)

Clamp (.3 cm)

(.79-10.2 cm)

Bracket (5.1 x 10.2 x .3 cm)

V-Block (6.3 cm)

59 024259 Thimble 1/8” 4

207 010207 SS Flat 3/8” 2

208 010208 SS Lock 3/8” 2

Washer (.95 cm)

Washer (.95 cm)

209 010209 SS Nut 3/8” 2

3209 013209 U-Bolt 2-7/8” 1

(.3 cm)

(.95 cm)

(7.3 cm)

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) 40
Total number of Elements 2
Free Space Gain (dBi) 6
Maximum Front to Back Ratio (dB) 28
VSWR Minimum 1.1:1
VSWR 1.5:1 Bandwidth (KHz) 150
2:1 Bandwidth (KHz) 250
Longest Element, ft (m) 43.75 (13.3)

Boom Length, ft (m) 22 (6.7)
Boom Diameter, in (cm) 2-1/2 (6.35)
Maximum Mast Diameter OD, in (cm) 2-1/2 (6.35)
Maximum Wind Survival, mph (kph) 90 (145)
Maximum Wind Surface Area, ft

2

(m2) 5.5 (.51)
Maximum Power Handling (KW) 2
Weight, lb. (kg) 55 (25)
Design Safety Factor 1.25

Turning Radius, ft (m) 24 (7.3

COMMUNICATIONS ANTENNAS

48 Perimeter Road, Manchester NH 03103 USA • Telephone: [phone] • Fax: [phone] • E-mail: [e-mail]

Web Site: http://www.cushcraft.com • International - Tel: [phone] • Fax:[phone]

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.

Limited Warranty