CUSHCRAFT BIG THUNDER Series User manual

20-15-10 Meter Nine Element Beam
951471 (9/98)
COMMUNICATIONS ANTENNAS
ASSEMBLY &
INSTALLATION

1
Verify all parts are present by using the X9 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.
Part No. Description Metric Equivalent Quantity Qty Check
014597 #8-32 x 3" Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . . #8 x 7.6 cm 2 ____
X9EW 7/8” x 12” Aluminum tube slotted 2 ends . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 x 30.5 cm 1 ____
X9EX 1/2” x 32” Aluminum tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 81.2 cm 2 ____
X99FS 1/2" Tinned Copper Braid 6" Long with Lugs . . . . . . . . . . . . . . . . . . . . . . . .1.2 cm x 15 cm 2 ____
010011 #8-32 Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ____
010082 1/4-20 x 1" Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm - 20 x 2.5 cm 56 ____
010084 1/4" Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm 107 ____
010085 1/4-20 Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm 19 ____
010120 #8-32 x 2" Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . . . . . #8 x 5.1 cm 4 ____
010123 #8-32 x 1 1/2" Stainless Steel Machine Screw . . . . . . . . . . . . . . . . . . . . . . . . #8 x 3.8 cm 4 ____
010207 3/8" Stainless Steel Flat Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 10 ____
010208 3/8" Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 10 ____
010209 3/8" Stainless Steel Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 10 ____
011941 #8 Stainless Steel Lock Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10____
013209 2-7/8" Center-to-center U-Bolt 4" Long . . . . . . . . . . . . . . . . . . . . . . 7.3 cm -10.2 cm Long 5 ____
1-Verification of Parts
Thank you for your purchase of the Cushcraft X9 Tribander. This antenna 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. Cushcraft operates
a full service Technical Support staff to answer questions regarding assembly, tuning, parts and just about everything else. Please contact us
by phone [phone] (8 AM - 5PM Eastern Time), FAX [phone], or email [email protected] for prompt service.
WARNING
THIS ANTENNA IS AN ELECTRICAL CONDUCTOR. CONTACT WITH POWER LINES CAN RESULT IN DEATH OR SERIOUS INJURY. DO
NOT INSTALLTHIS 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 MASTAND/OR TOWER MUST NOT BE CLOSE TO ANY
POWER LINES DURING INSTALLATION, REMOVAL OR IN THE EVENT PART OF THE SYSTEM SHOULDACCIDENTALLY 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 should be broken with strain insulators to improve
performance.
40 Meter Add-On Kit
The X940 40 meter add-on kit is available for the X9. The kit consists of a loaded dipole element that is mounted on the boom section BA
between Elements #2 and #3. The 40 meter element requires a separate coax feed. Contact Cushcraft or your dealer for more information.
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 RFARE NOT FULLY UNDERSTOOD,
LONG TERM EXPOSURE TO INTENSE RF FIELDS IS NOT RECOMMENDED.THERE ISAWARNING STICKER WHICH MUST BEATTACHED
TO THE BOOM AS SHOWN IN FIGURE 8A.
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 X9 consists of assembling the following subassemblies.
1) Verification of Parts. 2) Boom Assembly. 3) Element Assembly. 4) Element to Boom Assembly.
5) Feed System Assembly. 6) Boom to Mast Clamp Assembly. 7) Boom Truss Assembly.
Assembly of the X9 will be easiest if the preceding steps are performed in the given order. For easier tower mounting, some or all of the elements
may be mounted to the boom when the antenna is on the tower. If this option is chosen, the feed system can be attached after the elements
are mounted.
Please read through the entire assembly procedure before beginning.
NOTE: If you plan to install the 40 meter add-on kit, please read the X940 manual before you assemble the X9.

Part No. Description Metric Equivalent Quantity
014387 #8-32 Stainless Steel Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 ____
014399 1/4” Stainless Steel Lock Nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 cm 105 ____
014495 7/8" Cush-a-Clamp® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 cm 6 ____
014496 1" Cush-a-Clamp® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 cm 4 ____
014497 1-1/4" Cush-a-Clamp® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 cm 8 ____
014588 1/4" x 3-1/2" Stainless Steel Hex Bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 x 8.9 cm 15 ____
014592 1/4" Stainless Steel Flat Washer 1/8" Thick . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 x 0.3 cm 16 ____
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 14 ____
030409 11/16" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 cm 18 ____
030410 1" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 cm 26 ____
030411 1-1/8" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 cm 8 ____
030412 1-1/2" Worm Clamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 cm 8 ____
050053 1/2" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 cm 4 ____
050077 3/8" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 cm 14 ____
054526 2-1/2" Black Plastic Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 cm 2 ____
094622 35’ Phillystran cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.9m 1 ____
124565 5/8" x 8" Drilled Fiberglass Insulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 x 20.3 cm 2 ____
124566 7/8" x 8" Drilled Fiberglass Insulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 x 20.3 cm 1 ____
124567 1" x 8" Drilled Fiberglass Insulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 20.3 cm 1 ____
154554 3” x 2-1/2” x 1” Tuning Tube Insulator . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.6 x 6.3 x 2.5 cm 1 ____
170035 2-1/2" FormedAluminum Vee Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 cm 5 ____
194542 8" x 8" x 1/4"Aluminum Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . 20.3 x 20.3 x 0.6 cm 1 ____
194555 2-7/8” x 1” x 1/4” Tuning Tube Shorting Strap . . . . . . . . . . . . . . . . . . . . . . 7.3 x 2.5 x .6 cm 1 ____
194618 6” x 12” x 1/4”Aluminum mounting plate . . . . . . . . . . . . . . . . . . . . . . . . . 15.2 x 30 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 ____
244604 NOALOX® conductive lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ____
290326 Danger Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ____
323832 2” x 1-1/2” x 1/8” Feed Strap Plastic Insulator . . . . . . . . . . . . . . . . . . . . . . 5.1 x 3.8 x .3 cm 3 ____
324504 3" x 5-1/4" x 1/8" Drilled ExtrudedAluminum Bracket . . . . . . . . . . . . . . 7.6 x 13.3 x 0.3 cm 6 ____
324506 8" x 5-1/4" x 3/16" Drilled ExtrudedAluminum Bracket . . . . . . . . . . . . . 20.3 x 13.3 x 0.5 cm 2 ____
324509 4" x 5-1/4" x 3/16" Drilled ExtrudedAluminum Bracket . . . . . . . . . . . . . 10.2 x 13.3 x 0.5 cm 12 ____
324564 1" x 5-1/4" x 1/8" Drilled ExtrudedAluminum Bracket . . . . . . . . . . . . . . 2.5 x 13.3 x 0.3 cm 2 ____
330885 Brush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ____
T2 17” 10 meter Director Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 cm 2 ____
T4 19” 15 meter Director Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 cm 2 ____
T6 20-3/4” 15 Meter Director Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.7 cm 2 ____
TD 16-1/2” 10 Meter Director Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 cm 2 ____
MNX79 Matching Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 cm 1 ____
BA 2-1/2" x 84" Drilled Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 x 213 cm 1 ____
BB 2-1/2" x 72" Drilled Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 x 182 cm 1 ____
BC 2-1/2" x 54" Drilled Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 x 137 cm 1 ____
BD 2-1/2" x 66" Drilled Aluminium Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 x 167 cm 1 ____
BE 2-1/2" x 84" Drilled Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 x 213 cm 1 ____
EA 1-1/4" x 72" Aluminum Tube slotted 2 ends . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 x 183 cm 1 ____
EB 1-1/8" x 52 " Aluminum Tube slotted 1 end, 1" tube insert 1 end . . . . . . . . . 2.8 x 132 cm 4 ____
EC 1" x 36" Aluminum Tube slotted 7/8" swege 1 end . . . . . . . . . . . . . . . . . . . . . 2.5 x 91 cm 4 ____
ED 3/4" x 36" Aluminum Tube slotted 5/8" swege 1 end . . . . . . . . . . . . . . . . . . . . . 1.9 x 91 cm 10 ____
EE 1/2" x 36" Aluminum Tube slotted 1 end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 91 cm 8 ____
EF 3/8" x 48" Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 x 122 cm 4 ____
EG 1" x 48" Aluminum Tube slotted 2 ends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 122 cm 1 ____
EH 7/8" x 48" Aluminum Tube slotted 1 end . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 x 122 cm 2 ____
EJ 3/8" x 32" Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 x 81 cm 4 ____
EK 1" x 24" Aluminum Tube slotted 1 end, drilled 1 end . . . . . . . . . . . . . . . . . . . . . 2.5 x 61 cm 2 ____
EL 1-1/4" x 36" Aluminum Tube, slotted 1 end, drilled 1 end . . . . . . . . . . . . . . . . . 3.2 x 91 cm 2 ____
EM 1/2" x 24" Aluminum Tube slotted 1 end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 61 cm 6 ____
EN 3/8" x 36" Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 x 91 cm 6 ____
EP 1-1/4" x 48" Aluminum Tube slotted 2 ends . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 x 122 cm 2 ____
ER 1-1/8" x 48" Aluminum Tube slotted 1 end . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 x 122 cm 4 ____
ES 1/2" x 36" Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 91 cm 2 ____
ET 7/8" x 36" Aluminum Tube slotted 1 end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 x 91 cm 2 ____
EU 3/4" x 36" Aluminum Tube slotted 5/8" OD swege 1 end, drilled 1 end . . . . . . . 1.9 x 91 cm 4 ____
EV 1"x 36" Aluminum Tube slotted 1 end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 91 cm 4 ____
EX 1/2” X 32” Aluminum Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 x 81 cm 2 ____
EY 1" x 5-1/4" Aluminum Tube slotted 2 ends . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 x 13.3 cm 4 ____
EZ 3/8" x 30" Intentionally Bent Aluminum Tube crimped and drilled 1 end . . . . . . 1.0 x 76 cm 2 ____
FL1 5/8" x 16" Aluminum Flat Feedline Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 x 41 cm 2 ____
FL2 5/8" x 20-3/4" Aluminum Flat Feedline Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 x 53 cm 2 ____
FL3 5/8" x 28-3/4" Aluminum Flat Feedline Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9 x 73 cm 2 ____
2
Verification of Parts continued

ID Part # Description Dimensions Qty
82 010082 Hex 1/4-20 x 1” 30
Bolt (.6 x 2.5 cm)
84 010084 SS Lock 1/4” 50
Washer (.6 cm)
85 010085 SS Nut 1/4-20 19
(.6 cm)
99 014399 SS Lock 1/4” 50
Nut (.6 cm)
504 324504 Aluminum 3” x 5-1/4” x 1/8” 6
Bracket (7.6 x 13.3 x .3 cm)
509 324509 Aluminum 4” x 5-1/4 x 3/16” 12
Bracket (10.2 x 13.3 x .5 cm)
564 324564 Aluminum 1” x 5-1/4” x 1/8” 2
Bracket (2.5 x 13.3 x .3 cm)
588 014588 SS Hex 1/4” x 3-1/2” 13
Bolt (.6 x 10.2 cm)
592 014592 SS Flat 1/4” (1/8” thick) 16
Washer (.6 x .3 cm)
53”
(135 cm)
3
NOTE: The X9 is shipped with NOALOX® conductive lubricant and an applicator brush. Apply small amounts of
the lubricant to telescoping tubing sections during element and boom assembly. Apply small amounts of lubricant
to bolt/U-bolt threads to prevent galling (seizing) of the nuts during assembly. Also, apply small amounts to the
feedstrap assembly and matching network connections.
Figures 1, 2, 3 and 4 show the steps for boom assembly. Identify the tubing
sections, element brackets and hardware required for this step by using the
Boom Subassembly Parts List. Note the element brackets for Elements #3, #6,
#7 and #8 join the boom sections (Figure 3).
Refer to Figures 4A, 4B, 4C and 4D to assemble element brackets. The
1/4” hex nuts (85) are used as spacers on all brackets. Tighten these nuts in
place before assembling element bracket halves. The 1/4” flat washers (1/8”
thick) (529) are used on brackets as spacers (Figures 4A, 4B, 4C). The Boom
may be placed on a flat surface with all brackets laying flat on the surface. This
will allow all brackets to be fastened in line with each other. When tightening
the hardware, refer to Figure 4A and tighten all bracket hardware in this order.
Do not tighten the bolts on the Tuning Tube Support Insulator Bracket (Figure
4D). Allow the bracket to remain loose on the boom for Step 5 (Feed System
Assembly).
Nylon insert lock nuts are designed for one-time use. Do not tighten these
nuts if you expect to disassemble antenna sections during antenna mounting.
After mounting boom end caps (26), drill a small hole (1/4”) in the bottom
edge of the cap for water drainage. Determine which edge of the end cap will
be on the ground facing side of the boom when antenna is mounted in its final
position.
2-Boom Assembly
Figure 1
Figure 2
Figure 3
Figure 4
See
Fig.
4B
See
Fig.
4C
See
Fig.
4C
See
Fig.
4C
See
Fig.
4B
BC BD BE
BB
BA
See
Fig. 4A See Fig. 4A See Fig. 4A See Fig. 4A
Element
#3 Element #6 Element #7 Element #8
84”
(213.4 cm) 72” (182 cm) 54” (137 cm) 66” (167 cm) 84” (213 cm)
3-3/4”
(9.5 cm) 1-1/4” (3.2 cm) 33” (84 cm) 20” (51 cm) 1-1/4” (3.2 cm) 4-3/4” (12 cm) 1-1/4” (3.2 cm) 4-3/4” (12 cm) 1-1/4” (3.2 cm) 3-3/4” (9.5 cm)
BC BD BE
BB
BA
BC BD BE
BB
BA
26 26
#3 #4#2#1 #5 #6 #7 #8 #9
Mounting hole
for optional 40M
add-on kit.
Tuning
tube
support
insulator

4
Figure 4C
Figure 4A
Figure 4B
Figure 4D
Tighten
LAST
Tighten
FIRST
Tighten
SECOND
588
588
509
99
99
99
99
99
99
82 84
82 84
85
85
509
588
509
99
99
99
99
99
509
82 84
82 84
85
85
509
592
84
84
82
82
Leave out
until Step #9
82 84
592
82 84
85
85
82 84
588
504
84
99
99
99
99 99
84
84
509
84
504
504
564
82 84
82 84
85
564
99
99
84
84
82
592
82
Leave loose
for Step 5

6
4”
(10.16 cm)
1/4”
(.63 cm)
See Fig. 5C
See Fig. 5C
See Fig. 5B
FIGURE 5
ER
ER EP
EV
ES T6 T2
EY
EJ EM EU
EF EE EU
ED ET
EK
EC
EN EM
EN
ED
EE EB EL
ED
EM
EJ EH EG
ED
EE
EF
EC EB EA ED EE EF
EC
EB
ED EM EJ
EH
EC EN
ED EE
EB
EL
ED
ET
EK
EN
EM
EFEE
EU
EJ
EM
EU
EV ES
T6T2
EY
See Fig. 5A
Figures 5, 5A, 5B, and 5C show the steps for element assembly.
Identify the tubing sections required for each element using the Element
Subassembly Parts List. Each telescoping tubing section is inserted 4
inches into the larger section except where noted in Figure 5. Adjust the
length of the end tubing section to give each element the proper total half
length. All dimensions should be within 1/4 inch of the values given. Mark
the center of tubing sections EA, EG, and EP with a marker as shown in
Figure 6A. These marks will be used in Step 4 when elements are
mounted on the boom. The dimension between trapsTB andT2 is measured
between the ends of each trap. The 75 inch dimension from element #7
center is measured to the end of trap T2. The dimension between traps
T4 and TD is measured between the ends of each trap. The 72-1/2”
dimension from element #9 center is measured to the end of trap TD.
Insure all traps are installed with arrows pointing toward the boom. Also
position trap drain holes so they will be facing the ground when the antenna
is in its final position.
Install all worm clamps as shown. Take care not to overtighten and
strip the worm clamp. Apply electrical tape over the worm clamp and
tubing. This will keep the worm clamps from snagging wires or ropes in
the future. Extra worm clamps are provided. Note that all element sections
can be fastened using a self-taping screw at each tubing transition. Use
stainless screws for best performance. Properly installed worm clamps
will provide years of trouble free service.
The X9 is constructed entirely with .058-inch wall tubing. This creates
a tight transition between tubing sections with the closest possible fit and
better ice-loading characteristics than antennas constructed with thinner
wall tubing. Elements 3, 4, 5 and 6 have fiberglass center sections.
Reference figures 5A, 5B and5C for proper assembly.
After mounting element end caps (53, 77) punch a small hole (1/4”)
in the bottom edge (ground facing side) of each cap for water drainage.
Unless indicated otherwise, telescope
elements 4” (10.16 cm) and tighten
the worm clamp.
IMPORTANT
120
120
566
941
11
941
11
Figure 5B
565
Figure 5C
123
123
941
11
941
11
120
941
11
567 941
11
120
Figure 5A
ER
ER EP
EV
EX T4 TD
EY EV EX
T4TD
EY
ED
EE
EN EW
77 77
ED EE EN
11-1/2 Insert”
(29.2 CM)
ER
EP
ER
Butt ends of ER’s together
at the center of EP
24”(61cm)
5
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
Final Length
Adjustment
9” (22.9 CM)
Insert 9” (22.9 CM)
Insert
Final Length
Adjustment
11-1/2 Insert”
(29.2 CM)
3-Element Assembly
Element #1
Element #2
Element #3
Element #4
Element #5
Element #6
Element #7
Element #9
Element #8
77
77
77
77
77
77
53
53
53
77
77
77
77
77
77
83”
(210.8 CM)
7”
(17.8 CM)
24”
(60 CM)
110”
(279.4 CM)
141”
(358.1 CM)
205.5”
(522 CM)
148”
(375.9 CM)
220”
(558.8 CM) 220” (558.8 CM)
148”
(375.9 CM)
205.5”
(522 CM)
141”
(358.1 CM)
110”
(279.4 CM)
83”
(210.8 CM)
7”
(17.8 CM)
407 409 410 411 412
410
410
407 409
410 411 412
407 409
410
407 409 410
407 409
407 409
411 412
410
410 410
409 410 410
407409
410411
412
410
411
412 407
409
410 407
409410
407
409
407
411
412 410 409
410 410 407
409
409
567
566
565
565
C
L
C
L
53
5-3/4”
(14.6 CM)
24”
(60 CM)
5-3/4”
(14.6 CM)
411 412
410
410 410
409 410 410
411
412 410 409
410
410
407 409 409 407
72-1/2”
(184.2 CM)
26”
(66.0 CM) 72-1/2”
(184.2 CM) 26”
(66.0 CM)
75”
(190.5 CM)
28-1/2”
(72.4 CM) 75”
(190.5 CM) 28-1/2”
(72.4 CM)
94”
(238.8 cm) 94”
(238.8 cm)

ID Part # Description Dimensions Qty
11 010011 SS Nut #8-32 8
53 050053 Black 1/2” 4
Plastic Cap (1.3 cm)
77 050077 Black 3/8’ 14
Plastic Cap (0.9 cm)
120 010120 SS Machine #8-32 x 2” 4
Screw #8 x 5.1 cm)
123 010123 SS Machine #8-32 x 1-1/2” 4
Screw (#8 x 3.8 cm)
407 030407 Worm 5/8” 12
Clamp (1.6 cm)
409 030409 Worm 11/16” 14
Clamp (1.7 cm)
410 030410 Worm 1” 18
Clamp (2.5 cm)
411 030411 Worm 1-1/8” 6
Clamp (2.9 cm)
412 030412 Worm 1-1/2” 6
Clamp (3.8 cm)
565 124565 Fiberglass 5/8” x8” 2
Insulator (1.6 x 20.3 cm)
566 124566 Fiberglass 7/8” x 8” 1
Insulator (2.2. x 20.3 cm)
567 124567 Fiberglass 1” x 8” 1
Insulator (2.5 x 20.3)
941 011941 SS Lock #8 8
Washer
EA X79EA Aluminum 1-1/4” x 72” 1
Tube (3.2 x 183 cm)
EB X79EB Aluminum 1-5/8” x 52” 4
Tube (2.8 x 132 cm)
EC E79EC Aluminum 1” x 36” 4
Tube 2.5 x 91 cm)
ED X79ED Aluminum 3/4” x 36” 10
Tube (1.9 x 91 cm)
EE X79EE Aluminum 1/2” x 36” 8
Tube (1.3 x 91 cm)
EF E79EF Aluminum 3/8” x 48” 4
Tube (1.0 x 122 cm)
EG E79EG Aluminum 1” x 48” 1
Tube (2.5 x 122 cm)
EH E79EH Aluminum 7/8” x 48” 2
Tube (2.2 x 122 cm)
EJ E79EJ Aluminum 3/8” x 32” 4
Tube (1.0 x 81 cm)
EK X79EK Aluminum 1” x 24” 2
Tube (2.5 x 61 cm)
EL X79EL Aluminum 1-1/4” x 36” 2
Tube (3.2 x 91 cm)
EM X79EM Aluminum 1/2” x 24” 6
Tube (1.3 x 61 cm)
EN X79EN Aluminum 3/8” x 36” 6
Tube (1.0 x 99 cm)
EP X79EP Aluminum 1-1/4” x 48” 2
Tube (3.2 x 122 cm)
ER X79ER Aluminum 1-1/8” x 48” 4
Tube (2.9 x 122 cm)
ES X79ES Aluminum 1/2” x 36” 2
Tube (1.3 x 91 cm)
ET X79ET Aluminum 7/8” x 36” 2
Tube (2.2 x 91 cm)
EU X79EU Aluminum 3/4” x 36” 4
Tube (1.9 x 91 cm)
EV X79EV Aluminum 1” x 36” 4
Tube (2.5 x 91 cm)
EW X9EW Aluminum 7/8” x 12” 1
Tube (2.2 x 30.5 cm)
EX X9EX Aluminum 1/2” x 32” 2
Tube (1.3 x 81 cm)
EY A34SEF Aluminim 1” x 5-1/4” 2
Tube (2.5 x 13.3 cm)
T6 T6 15 M 20-3/4” 2
Trap (52.7 cm)
TD TD 10 M 16-1/2” 2
Trap (42 cm)
T2 T2 10 M 17” 2
Trap (43 cm)
T4 T4 15 M 19” 2
Trap (48 cm)
TD
T4
T2
T6
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.
3-Element Assembly
Parts List

ID Part # Description Dimensions Qty
84 010084 SS Lock 1/4” 36
Washer (.6 cm)
99 014399 SS Lock 1/4” 36
Nut (.6 cm)
495 014495 Cush-a-Clamp® 7/8” 6
(2.2 cm)
496 014496 Cush-a-Clamp® 1” 4
(2.5 cm)
497 014497 Cush-a-Clamp® 1-1/4” 8
(3.2 cm)
7
Figure 6D
Figure 6F
Figure 6B
Figure 6C
Figure 6E
Figure 6A
Figure 6
Mark Center Line
of element using
element half lengths.
Elements can be attached to the boom when the antenna is on the ground or when
the antenna is being installed on a tower.Identify the hardware required to secure
the elements by using the Element-to-Boom Parts List. Figure 6 shows the position
of each element on the boom. Mark the center of element as shown in Figure 6A.
Figures 6B, 6C, 6D, 6E, 6F show the hardware required to attach each element to
the element bracket. Position each element center mark equidistant between each
Cush-A-Clamp. Leave the Cush-A-Clamps loose on the Log Cell Elements (#3, #4,
#5, #6) until the feed straps are attached in Step 5.There are three sizes of Cush-
A-Clamps.Tighten each clamp until the element tubing can no longer rotate inside
the Cush-A-Clamp.The lock washers under the nuts securing the Cush-A-Clamps
should be tightened until they are flat against the mounting bracket.
See
Fig.
6B
See
Fig.
6C
See
Fig.
6B
See
Fig.
6C
495
495
84
99
84
99 84
99
497
497
84
99
84
99 84
99
7/8” Cush-A-Clamp
497
497
84
99
84
84
99
1-1/4” Cush-A-Clamp
99
495
495
84
99
84
84
99
7/8” Cush-A-Clamp
99
496
496
84
99
84
99 84
99
1” Cush-A-Clamp
1-1/4” Cush-A-Clamp
4-Element to Boom Assembly
See
Fig.
6D
See
Fig.
6E
See
Fig.
6E
See
Fig.
6E
See
Fig.
6D
#3 #4#2#1 #5 #6 #7 #8 #9

ID Part # Description Dimensions Qty
87 014387 SS Lock #8-32 8
Nut
554 154554 Tuning Tube 3” x 2-1/2” x 1” 1
Insulator (7.6 x 6.3 x 2.5 cm)
555 194555 Tuning Tube 2-7/8” x 1” x 1/4” 1
Shorting Strap (7.3 x 2.5 x .6 cm)
832 323832 Strap 2” x 1-1/2” x1/8” 3
Insulator (5.1 x 3.8 x .3 cm)
FL1 X79FL1 Feedline 5/8” x 16” 2
Strap (.9 x 41 c m)
FL2 X79FL2 Feedline 5/8” x 20-3/4” 2
Strap (.9 x 53)
FL3 X79FL3 Feedline 5/8” x 28-3/4” 2
Strap (.9 x 73 cm)
EZ X79EZ Bent Alum 3/8” x 28” 2
Tube (.95 x 71.1 cm)
8
Figure 7
Element
#3 Element
#5
Element
#4 Element #6
The feed system consists of 3 sub-assemblies. They are the feed-straps,
the tuning tube insulator and the matching network. Figure 7 illustrates the
3 pairs of feed-straps (FL1, FL2, FL3). Refer to the Feed System Subassembly
Parts List for the hardware required to install the straps. Slide a feed-strap
insulator (832) on to each pair of feed-straps to space and insulate the straps.
Elements may be rotated slightly during feed strap attachment. Tighten Cush-
A-Clamps on Elements #3, #4, #5 and #6.
Locate the 2 tuning-tubes (EZ). Attach the punched ends of each tube to
the screws at the center of Element #3.
Locate the Tuning Tube Shorting Strap (555). Loosen the 2 screws and
slide the strap onto the tuning tubes (EZ). Leave strap loose.
1/2”
(1.3 cm)
87 87
832
9EZ
5-Feed System Assembly
832
FL1
FL2
FL3
832
832
EZ
555
554
Mast mounting
location for reference

ID Part # Description Dimensions Qty
82 010082 Hex 1/4-20 x 1” 2
Bolt (.6-20 x 2.5 cm)
84 010084 SS Lock 1/4” 2
Washer (.6 cm)
87 014387 SS Lock #8-32 2
Nut
554 154554 Tuning Tube 3” x 2-1/2” x 1” 1
Insulator (7.6 x 6.3 x 2.5 cm)
555 194555 Tuning Tube 2” x 1-1/2” x 1/8” 1
Shorting Strap (5.1 x 3.8 x .3 cm)
597 014597 SS Machine #8-32 x 3” 2
Screw (7.6 cm)
941 011941 SS Lock #8 4
Washer
EZ Tuning Tube 3/8” x 30” 2
(,95 x 76.2 cm)
FS X79FS Feed 6” 2
(15.2 cm)
MN MNX79 Matching 1
Network
Form Drip Loops
with feed straps.
Coax Drip Loop
941 941
597
87
87
597
MN
87
941
FL1
87
87
FS
FS
Element #6
Figure 7A
555
EZ
Figure 7B
Figure 7C
9
Refer to Figure 7A and attach the tuning tube insulator to the
boom bracket. Use the hardware listed in the Tuning Tube Insulator
Subassembly Parts List. Slide the insulator toward tuning tubes (EZ)
until tube ends slide into the insulator holes, (Figure 7B). Tighten
bolts on boom bracket securing tuning tube insulator in place.
Reference Figure 7 and position the Tuning Tube Shorting Strap
(555) 1/2 inch from the tuning tube insulator. Adjusting this strap will
not have a significant effect on the VSWR of the X9. Tighten strap
screws.
554
82
84
82
84
Reference Figure 7C for matching network mounting. Required
hardware is listed in the Matching Network Subassembly Parts List.
Attach matching network (MN) to boom with two 8-32 bolts (597).
Connect feed straps (FS) from matching network terminals to each
FL3 end at the center of Element #6. Form drip loops in the feed
straps and position them as shown in Figure 7C. Form the feed-
straps away from the Cush-A-Clamp U-bolts and Element #6 element
bracket.

ID Part # Description Dimensions Qty
35 170035 Aluminum 2-1/2” 4
V-Block (6.3 cm)
82 010082 Hex 1/4-20 x 1” 16
Bolt (2.5 cm)
84 010084 SS Lock 1/4” 18
Washer (0.6 cm)
99 014399 SS Lock 1/4” 18
Nut (.6 cm)
207 010207 SS Flat 3/8” 8
Washer (.95 cm)
208 010208 SS Lock 3/8” 8
Washer (.95 cm)
209 010209 SS 3/8” 8
Nut (.95 cm)
326 290326 Danger 1
Label
506 324506 Aluminum 8” x 5-1/4” x 3/16” 2
Bracket (20.3 x 13.3 x .5 cm)
542 194542 Alu Mounting 8” x 8” x 1/4” 1
Plate 20.3 x 20.3 x .6 cm)
588 014588 SS Hex 1/4” x 3-1/2” 2
Bolt (.6 x 8.9 cm)
618 194618 Alu Mounting 6” x 12” x 1/4” 1
Plate (15.2 x 30.5 x .6 cm)
3209 013209 U-Bolt 2-7/8” 4
(7.3 cm)
10
Figure 8A
Figure 8
The X9 boom to mast clamp is designed to be mounted on the
tower/mast so the built in boom shelf feature can be utilized. Following this
suggestion, if possible, will simplify antenna installation.
Reference Figure 8 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
boom bracket (506) as shown in Figure 8A. This allows the boom to be
moved back and forth for tower top element mounting.
When all elements are securely mounted to the boom and the
feed system is in place, line up the 2 holes in the top of the upper boom
bracket (506) holes with the corresponding 2 holes in boom section BC.
Insert bolts (588) and tighten in place. Next, tighten the 8 bolts, securing
the upper and lower boom brackets. Tighten the 4 bolts connecting the
upper boom bracket to the mast plate.
Attach good quality coax with a PL-259 connector to the X9
matching network. Route the coax as shown in Figure 7C. 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.
506
588
84
99
99
84
82
588
84
99
326
506
6-Boom to Mast Clamp Assembly
209
208
207
35
99
209
208
207
207
208 209
3209
3209
209
506
542
208
207
209
208
207
618
35
35
35
Boom Shelf
82 84
209
208
207
209
208
207

Figure 9
Tuning Procedure
The X9 does not require tuning. The broadband VSWR characteristics of the log cell can not be improved by adjusting element lengths. Varying the
element dimensions from those suggested in this manual is not recommended. For help with tuning, please contact Cushcraft technical support.
48 Perimeter Road, Manchester NH 03103 USA • Telephone: [phone] • Fax: [phone] • E-mail: [email protected]
Web Site: http://www.cushcraft.com • International - Tel: [phone] • Fax:[phone]
COMMUNICATIONS ANTENNAS
7 - Boom Truss
Assembly
Frequency Coverage (Meters) 10, 15, 20
Total number of Elements 9
Maximum Gain (dBi) 20M 13.0 @ 14 deg
@ One Wavelength 15M 13.9 @ 12 deg
above ground 10M 14.0 @ 15 deg
Free Space Gain (dBi) 20M 8.25
15M 9.75
10M 9.75
Maximum Front to Back Ratio (dB) 30
Number of Elements per Band 4*
VSWR Minimum 1.1:1
VSWR 1.5:1 Bandwidth (KHz) 20M 350
15M 450
10M 1500
Longest Element, ft (m) 36.5 (11.12)
Turning Radius, ft (m) 21.7 (6.61)
Boom Length, ft (m) 28 (8.53)
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) >100 (>161)
Maximum Wind Surface Area, ft
2
(m
2
) 9.9 (.92)
Windload @ 80 mph, lb (kg) 255 (116)
Maximum Power Handling (KW) 2
Weight, lb. (kg) 85 (38.5)
Design Safety Factor 1.25
* 6 active elements on 10 meters
SPECIFICATIONS
Figure 9 illustrates the boom truss assembly. Refer to
the boom truss assembly parts list for the hardware
required. The X9 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 plate (26) 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.
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.
22
24
59
91
207
208
209
24
24
24
24
23
207
208
209
ID Part # Description Dimensions Qty
22 094622 Phillystran 1/8” x 35’ 1
Cable (.3 x 10.7m)
24 024624 Cable 1/8” 12
Clamp (.3 cm)
23 024623 Turnbuckle 5/16”-4” 2
(.79-10.2 cm)
91 194791 Truss 2” x 42” x 1/8” 1
Bracket (5.1 x 10.2 x .3 cm)
35 170035 Aluminum 2-1/2” 1
V-Block (6.3 cm)
59 024259 Thimble 1/8” 4
(.3 cm)
207 010207 SS Flat 3/8” 2
Washer (.95 cm)
208 010208 SS Lock 3/8” 2
Washer (.95 cm)
209 010209 SS Nut 3/8” 2
(.95 cm)
3209 013209 U-Bolt 2-7/8” 1
(7.3 cm)
3209
23
Bottom of saddle
Load bearing
strand lays in
bottom of saddle.
2”
(5.1 CM)
SAFETY
LOOP
59
35