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 INSTALLATIONS RECOMMENDED BY THE U.S. CONSUMER PRODUCT SAFETY
COMMISSION AND LISTED IN THE ENCLOSED PAMPHLET.
Your Cushcraft 13B2N Boomer antenna is designed and manufactured to give trouble free service. This antenna will perform as specified if the
instructions and suggestions in this manual are followed and care is used in the assembly and installation. When checking the components received
in your antenna package use the parts listed beside each diagram. There is a master parts list on page 2. If you are unable to locate any tube or
component, check the inside of all tubing.
IMPORTANT: Save the weight label from the outside of the carton. Each antenna is weighed at the factory
to verify the parts count. If you claim a missing part, you will be asked for the weight verification label.
PLANNING
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 the boss and that they must follow your instructions. If you have any doubts at all, employ a professional antenna
installation company to install your antenna.
LOCATION
Location of the antenna is very important. Surrounding objects such as trees, power lines, other antennas, etc. will seriously reduce efficiency. To
minimize the effects of surrounding objects, mount the antenna as high and in the clear as possible. If metal guy wires are used, they should be
broken with strain insulators. EXTREME CARE MUST BE USED FOR YOUR SAFETY. YOU MUST INSURE THAT WHILE THE 13B2N IS IN
OPERATION NEITHER PEOPLE OR PETS CAN COME IN CONTACT WITH ANY PORTION OF YOUR ANTENNA. DEADLY VOLTAGES AND
CURRENTS MAY EXIST. ALSO, SINCE THE EFFECTS OF EXPOSURE TO RF FIELDS 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 E.
MOUNTING
The mast mount bracket will accommodate up to a 2" (5.1 cm) mast. A 1-1/2" OD (3.8 cm) or larger heavy wall tubing mast should be used. A good
heavy duty antenna rotator will provide the best service and longest life. Often it is desirable to mount several antennas on one mast. To keep
possible interaction to a minimum, place your antennas as far apart as you can. The 13B2N provides excellent gain, clean pattern and low VSWR
across the entire 2 meter band. It can be mounted either horizontally or vertically.
VERTICAL (FM):
If you plan to mount the 13B2N for vertical polarization, best results can be obtained by mounting the antenna at the top of the
mast. Note that element #6 is 3" (7.6 cm) from the edge of the mast mounting plate as shown in Figure D.
Install the 13B2N with the elements on the
side of the mast opposite from the mounting plate.
A vertically polarized 13B2N will have a VSWR of under 2:1 from 144 to 146 MHz.
HORIZONTAL (CW/SSB):
Mount your 13B2N horizontally and as high as possible, with the boom-to-mast plate between elements 6 and 7 as shown
in figure D.
SYSTEM GROUNDING
Direct grounding of the antenna, mast and tower is very important. This serves as protection from lightning strikes and static buildup, and from high
voltage which is present in the radio equipment connected to the antenna. A good electrical connection should be made to one or more ground rods
(or other extensive ground system) directly at the base of the tower or mast, using at least #10AWG ground wire and non-corrosive hardware. For
details and safety standards, consult the National Electrical Code. You should also use a coaxial lightning arrester. Cushcraft offers several different
models, such as LAC-1, LAC-2 and the LAC-4 series
.
ASSEMBLY
Assemble your antenna by following the directions and illustrations in steps 1 through 6. After the antenna is completely assembled, verify
dimensions and element spacings for accuracy. Then, return to the section below for final tuning.
TUNING PROCEDURE
The 13B2N does not normally require tuning after assembly. However, if you wish to check the VSWR before installation, please observe the
following procedures. To prevent detuning the antenna, it should be tuned in place or at least 7 feet (2.13 meters) above ground and clear of
surrounding objects. Keep all metal obstructions such as guy wires and other antennas at least 10 feet (3.05 m) away since they will nullify any
adjustment and degraded performance will result.
Run the coax cable from your transmitter to the area in which the antenna is going to be tested. The length of this cable or your feedline is not critical.
Connect a good quality VSWR bridge to the end of this cable. Connect a short length of cable [10 ft. (305 cm) or less] from the VSWR bridge to the
antenna. Set the transmitter to your center operating frequency. When you read VSWR, be sure you move far enough away from the antenna so that
your body does not effect the reading.
Measure the VSWR. If it is high, move both T-Match straps (125) by 1/4" (.6 cm) either inward or outward and check the VSWR. Both T-match
straps should be the same distance from the center of the driven element. If the VSWR improved, then continue moving the T-Match straps in the
same direction. If the VSWR deteriorated then move the T-Match straps in the opposite direction. Repeat this procedure until no further
improvement can be made. You have matched your antenna. Then tighten all connections on the T-Match driven element assembly. Tape the
feedline to the boom and mast as shown in figure G.
1
13B2N
MASTER PARTS LIST
KEY
11
26
28
41
53
70
77
79
84
85
104
115
116
118
119
120
123
125
131
P/N
010011
190026
190028
011941
050053
190070
050077
010079
010084
010085
010104
050115
240116
010118
010119
010120
010123
200125
050131
DESCRIPTION
QTY
8-32 stainless steel hex nut
22
7/8" (2.2 cm) formed aluminum bracket
13
Aluminum half washer
12
No. 8 split lock washer
26
1/2" (1.27 cm) black plastic cap
2
4" x 6" (10.2 x 15.2 cm) formed mounting plate
1
3/8" (.95 cm) black plastic cap
2
8-32 x 1/2" (1.3 cm) stainless steel machine screw
4
1/4" (.64 cm) stainless steel lock washer
4
1/4" (.64 cm) stainess steel hex nut
4
1/4" (.64 cm) stainless steel flat washer
4
Vinyl Boot
1
Silicone Package
1
5/16" (.79 cm) stainless steel hex nut
4
5/16" (.79 cm) stainless steel lock washer
4
8-32 x 2" (5.1 cm) stainless steel machine screw
12
8-32 x 1-1/2" (3.8 cm) stainless steel machine screw
3
T-match strap
2
1-1/8" (2.86 cm) black plastic cap
2
KEY
232
326
401
404
411
940
BA
BB
BC
UM
EA
EB
EC
ED
EE
EF
EG
ET
P/N
010232
290326
010401
010404
030411
360940
DESCRIPTION
QTY
8-32 x 2 -1/2" (6.4 cm) stainless steel machine screw
1
Danger label
1
1-1/2" x 3" (3.8 x 7.6 cm) stainless steel U-bolt
2
2-1/2" x 3" (5.5 x 7.6 cm) stainless steel U-bolt
2
1-3/8" (3.5 cm) stainless steel worm clamp
2
No. 8 flat washer
1
1-1/8" x 48" (2.9 x 121.9 cm) aluminum tubing
1
1-1/4" x 72" (3.2 x 182.9 cm) aluminum tubing
1
1-1/8" x 72" (2.9 x 182.9 cm) aluminum tubing
1
UltraMatch Balun
1
39-3/4" (101 cm) aluminum rod
1
1/2" x 38-7/8" (1.3 x 98.7 cm) aluminum tubing
1
37 -7/8" (96.2 cm) aluminum rod
1
36 -1/4" (92.1 cm) aluminum rod
2
35 -3/4" (90.8 cm) aluminum rod
1
35-1/4" (89.5 cm) aluminum rod
1
34-5/8" (88 cm) aluminum rod
6
3/8" x 6-1/2" (.95 x 16.5 cm) aluminum tubing
2
UM2N
#1 - ASSEMBLE BOOM
Assemble the boom as shown below. Slide worm clamps (411) onto the
slotted ends of tube BB. Insert the end of tube BC into the end of tube
BB until the first set of drilled holes are aligned. Join booms with screw
(123), washer (41) and nut (11). Refer to the dimensions in figure A to
be sure that the proper tube ends are joined. Do the same with tube BA.
Tighten the screws and worm clamps. Push the end caps (131) onto the
ends of the boom.
KEY
BA
BB
BC
11
41
123
131
411
P/N
DESC.
ALUM
TUBING
ALUM
TUBING
ALUM
TUBING
SIZE
1-1/8" x 48"
(2.9 x 121.9 cm)
1-1/4" x 72"
(3.2 x 182.9 cm)
1-1/8" x 72"
(2.9 x 182.9 cm)
8-32
#8
8-32 x 1-1/2"
(3.8 cm)
1-1/8"
(2.86 cm)
1-3/8"
(3.5 cm)
QTY
1
1
1
2
2
2
2
2
010011
011941
010123
050131
030411
SS HEX
NUT
SS LOCK
WASHER
SS
SCREW
PLASTIC
CAP
SS WORM
CLAMP
FIGURE A
BA
4-1/4"
(10.8 cm)
BB
2-3/4"
(7 cm)
BC
1-1/2"
(3.8 cm)
7-3/4"
(19.7 cm)
15-1/2"
(39.4 cm)
1-1/2"
(3.8 cm)
123
411
131
BA
1/4" (.63 cm)
41
11
BB
41
11
123
411
131
BC
1/4" (.63 cm)
2
13B2N
13B2N
#2 - ASSEMBLE T-MATCH
11
41
79
125
77
11
41
EB
53
KEY
P/N
DISPLAY
DESC
SS
HEX NUT
ALUMINUM
BRACKET
ALUMINUM
HALF WASHER
SS LOCK
WASHER
SS MACHINE
SCREW
SIZE
8-32
QTY
12
#3 - MOUNT ELEMENTS
Attach the solid rod reflector and directors to the boom at the
locations shown on figure D. First check all element lengths using
table A. Group similar element lengths together. The elements
are progressively shorter as you proceed toward the front end of
the boom. Attach each element to the boom using the hardware
shown in figure C.
11 010011
26 190026
7/8"
(2.2 cm)
12
FIGURE B
41
11
41
26
ET
11
28 190028
12
11
41 011941
#8
12
41
ELEMENT
BOOM
120 010120
EB
79
125
ET
8-32 x 2"
(5.1 cm)
12
26
940
53
77
41
41
11
232
4-1/2"
(11.8 cm)
123
4-1/2"
(11.8 cm)
41
UM
TABLE A (Element Lengths)
28
KEY
EA
EB
EC
ED
EE
EF
EG
Element
No.
1
2
3
4,5
6
7
8-13
Length
INCHES CM
39-3/4
101.0
38-7/8
98.7
37-7/8
96.2
36-1/4
92.1
35-3/4
90.8
35-1/4
89.5
34-5/8
88.0
120
FIGURE C
KEY
EB
ET
UM
P/N
DISPLAY
DESC
ALUM
TUBING
ALUM
TUBING
SIZE
1/2" x 38-7/8"
(1.3 x 98.7 cm)
3/8" x 6-1/2"
(.95 x 16.5 cm)
QTY
1
2
1
UM2N
UltraMatch
BALUN
SS HEX
NUT
ALUM
BRACKET
SS LOCK
WASHER
PLASTIC
CAP
PLASTIC
CAP
SS MACHINE
SCREW
SS MACHINE
SCREW
T-MATCH
STRAP
SS MACHINE
SCREW
ALUM FLAT
WASHER
8-32 x 2 1/2"
(6.4 cm)
#8
8-32
7/8"
(2.2 cm)
#8
1/2"
(1.27 cm)
3/8"
(.95 cm)
8-32 x 1/2"
(1.3 cm)
8-32x1-1/2
(3.81)
11 010011
26 190026
41 011941
53 050053
77 050077
79 010079
123 010123
125 200125
232 010232
940 360940
8
1
10
2
2
4
1
2
1
1
Assemble the T-match to the driven element (EB) as illustrated
in figure B. First attach the UltraMatch to the driven element with
the hardware shown. Then connect the T-match elements (ET)
to the UltraMatch with the split washers (41) and nuts (11). Next,
attach the T-match elements to the driven element with the T-
match straps (125) and hardware shown
while noting the spacing dimensions
between the straps. Place plastic caps
(53) on the ends of the tube EB and plastic
caps (77) on the ends of the tubes ET.
Attach this subassembly to position 2 on
the boom as shown in figure D noting that
1
the UltraMatch feedpoint must face the
center of the antenna. Tighten all screws.
FIGURE D
2
3
4
5
6
7
8
9
10
11
12
13
EA
EB
EC
ED
ED
EE
3"
(7.6 cm)
EF
EG
EG
EG
EG
EG
EG
131
131
15-1/2"
(39.4 cm)
8-11/16"
(22.1 cm)
9"
(22.9 cm)
14-7/8"
(37.8 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
16-1/4"
(41.3 cm)
Direction of Maximum Signal
3
4
13B2N
#4 - ASSEMBLE BOOM TO MAST MOUNT
Assemble and mount the boom to mast clamp bracket (70) between
elements 6 and 7 with the U-bolts 401 as shown in figure E. Secure with
flat washer (104), lock washer (84) and nut (85) in that order. Note that
the rear of the mast clamp must be 3 inches (7.6 cm) from element 6 as
shown on figure D. You are now ready to mount the antenna to your
mast using the U-bolts 404. Secure with lock washers (119) and nut
(118) in that order. Affix the warning label (326) to the boom as shown in
figure E.
KEY
P/N
DISPLAY
DESC
SS LOCK
WASHER
SS HEX
NUT
SS FLAT
WASHER
SS HEX
NUT
SS LOCK
WASHER
SS
U-BOLT
SS
U-BOLT
MOUNTING
PLATE
DANGER
LABEL
SIZE
1/4"
(.64 cm)
1/4"
(.64 cm)
1/4"
(.64 cm)
5/16"
(.79 cm)
5/16"
(.79 cm)
1 1/2" x 3"
(3.8 x 7.6 cm)
2 1/2" x 3"
(5.5 x 7.6 cm)
4" x 6"
(10.2 x 15.2 cm)
QTY
4
4
4
4
4
2
2
1
1
84 010084
85 010085
104 010104
118 010118
FIGURE E
70
MAST
119 010119
401 010401
404
404 010404
401
85
84
104
119
118
70 190070
326 290326
119
401
326
118
#5 - CONNECTOR ASSEMBLY
KEY
P/N
DISPLAY
cushcraft
DESC
CONNECTOR
BOOT
SILICONE
PACKAGE
SIZE
QTY
1
1
115 050115
116 240116
SILICONE GREASE
The antenna is designed for use with 50 Ohm coaxial cable terminated
with an N connector. Any length of feedline can be used with your 13B2N.
The shortest length of cable will have the least loss. A connector boot is
included for use with your new antenna. A connector boot is included with
your new antenna. Slide the boot over the cable before attaching your N
connector (figure F). Spread silicone on the outer threads of the
UltraMatch and N connector.
DO NOT COAT THE CENTER PINS OF
THE N CONNECTOR OR THE ULTRAMATCH SOCKET.
Attach the
connector to the UltraMatch. Apply the remaining silicone to the outside
of the connector and against the mast bracket for a weather tight
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Microcontroller MCU
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