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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
1
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2
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4
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4
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2
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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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.
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