CUSHCRAFT 17b2 Instruction manual

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ASSEMBLY AND INSTALLATION
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17B.2
WARNING
THIS ANTENNA IS AN ELECTRICAL CONDUCTOB. CONTACTWITH POWER LINES CAN RESULTIN 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 MAST AN D/OR TOWE R MUST NOT BE CLOSE
TO ANY POWER LINES DURING INSTALLATION, REMOVAL OR IN THE EVENT PART OF THE SYSTEM SHOULD ACCIDENTALLY
FALL. FOLLOWTHE GUIDELINES FOR ANTENNA INSTALLATIONS RECOMIVENDED BY THE U.S. CONSUMER PRODUCTSAFEW
COMI/IISSION AND LISTED IN THE ENCLOSED PAMPHLET,
Your Cushcralt l7B2 Boomer antenna is designed and manufactured to giw fouble lrss ssrvice. This anbnna will perform as sp€cified if the
instructions and suggesùons in fris manual are followgd and care is used in the assembly and installation. When checking the components received
in your ântenna pâckâge use the parts listsd b€side each diagram. There is a master parts list on page 7. lf you are unable to locate any tube or
component, check the inside ol all tubing. IMPORTANT: Save the weight labellrcn he outside ol the catton. Eæh antenna is webhed atthe factoty
to verify the pafts count. ll you claim a missing paft, you will be asked lor the weight wrilicalon label.
PLANNING
Plan your installâtjon carefully. lf you use volunteer helpers be sure that they are qualified to assist you. Maks csrlain that everyone involved
underslands that you are in charge and that they must follow your instructions. lf you have any doubts at all, employ a professional antenna
installation company to install your antenna.
LOCATION
Location of the antenna is very important. Sunounding objects such as trees, power lines, other antennas, etc. will seriously reducs efficiercy. To
minimize the effr-.cts ot sunounding objects, mount the antenna as high and in the clear as possible. lf metal guy wires are used, they should bs
broken with strain insulators. EXTREME CARE MUST BE USED FOR YOUR SAFETY. YOU MUST INSURE THAT WHILE THE l7B2 lS lN
OPEMTION NEITHER PEOPLE OR PETS CAN COME IN CONTACT WTH ANY PORTION OF YOUR ANTENNA, DEADLY VOLTAGES AND
CURRENTS IVAY EXIST. ALSO, SINCE THE EFFECTS OF EXPOSURE TO RF FIELDS ARE NOT FULLY UNDERSTOOD, LONG TERM
EXPOSURE TO INTENSE RF FIELDS IS NOT RECOMMENDED, THEBE IS A WARNING SÏICKER WHICH MUST BE ATTACHED TO THE
BOOM AS SHOWN IN FIGURE E.
MOUNTING
The mast mounl bracket will accommodat€ up to a 2' (5.1 cm) mast. A I - 1/2" OD (3.S cm) or larger heavy wall tubing mast should bs used. A good
heaw duty antenna rotâtor will p.ovide the best servics and longgst life. Often it is desirable to mount several antennas on one mast. To keep
possible interaction to a minimum, place your antennas as fâr apart as you can.
SYSTEM GROUNDING
Direct grounding of the antsnna, mast and tower is very important. This serves as protection from lightning strikss and static buildup, and lrom high
vollage which is present in the radio equipment connected to the antenna. A good electrical connection should be made to one or mors ground rods
(or other extensive ground sysùem) dir€ctly at the base ol 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 diltsrgnt
models, such as LAC-1, LAC-2 and he LAC-4 series
ASSEMBLY
Assemble your antenna by following the direclions and illustrations in steps 1 through 7. Atter ihe antenna is completely assembled, \,erify
dimensions and €lement spacings for accuracy. Then, return to the section below for final tuning.
TUNING PROCEDURE
The 1 782 does not normally requke tuning after assembly. However, il you wish to check he VSWR betore installation, please obsen/€ 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 ol surrounding
objects. Keep all meial obstructions such as guy wires and other antennas at least 10 feet (3.05 m) away since they will nullily any âdjusùnent and
degraded performance will result-
Run the coax cable from your transmittêr to the area in which the antenna is going to be tested. The length of lhis cable or your leedline is not critical.
Connect a good quality VHF VSWR bridge to the end of this cable. Connect a short length of cable [20 tt (610 cm] or lessl from the VSWR bridge to
the antenna. Set the trânsmitter 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 etfect the reading.
Measure ths VSWR. lf it is too high, move both T-Maich strâps (1 25) by 1/4' (.6 cm) either inward or outward and check the VSWR. Both T-ttatch
sùaps should be the same dislanæ lrcm lhe centet ol the d ven elemerL lt the VSWR improved, tren continue moving the T-Match skâps in the
same direction. lf the VSWR deteriorated then move the T-Match strâps in the opposite direction. Repeat this procedure until no turther
improvement can be made. You have matched your antenna. Then tighten all connections gn the T-Match driven el€ment assembly. Tape 6s
leedline to the boom and mast as shown in figure l.

17B.2
#1 I ASSEMBLE BOOM
Asssmbleth€ boom in two s€clions, ths rear and ths tront (figure A). Slidewormclamps (413) onb the large diameter ends of tubes BC and BD. Slids
worm clamps (412)onto the smallerdiameterend ofthe tubes BC and BD andworm clamp (4'll ) on lhs smallordiamsterendoftubes BBand BE. lnsen
the end oftube BA inb he end oftube BB untilthe first set of holes are aligned. lnsenthe screw, washerand nutaÊ sho{/n below. Refsr to the dimensions
in figursA b be sure that he propertube ends are,oined. Do ths same with tubes BB, BC, BD, BE and BF. Join thslwo boom sections togetherwith
tubs BG. Tighten Ùle screws and worm clamps. Push tls plastic caps (38) onlo the onds ofthe boom. NOTE: screw 232 will be used later for attachment
to element EK.
FIGURE A
6'L--+t l+-25-13/16"-d -rr F-1-13i/16"
cm) | | (6s.s6cm) | | | ra.zecml
' t . ?[Il--Tl
BF
REAR
38
rrt Y31 FRONT
412 |
ê-
| -41
*\ \.1.1
1-1t2"
1 0-5/1
KEY P/N DESC. stzE ATY
BA r.-r(-l ALUM
TUBING
'l "x64'
(2.5 x 162.6 cm) 1
BB L. . )t . I
r--------lL-------J ALUM
TUBING 1-1/4" x 60"
(3.2 x 152.4 cm) 1
BC tr;-=?F-- ALUM
TUBING 1-112" x72" (3.8 x 182.9 cm) 1
BD --
t-- .\\. .---r ALUM
TUBING 1-112" x72"
(3.8 x 182.9 cm) 1
BE
--
lrtt..J
I \l-.- ALUM
TUBING 1-114" x 60"
(3.2 x 152.4 cm) 1
BF r.--1(-l ALUM
TUBING 1" x 60"
(2,5 x152.4) 1
BG E]E ALUM
TUBING 1-3/8" x 12"
(3.5 x 30.5 cm) 1
11 01 001 1ffi SS HEX
NUT 8-32 6
31 01 0231 €rnnînmTrrnnn SS
SCREW 8-32 x 1-314" (4.4 cm) 2
KEY P/N DESC. slzE QTY
41 01 1 941 @SS LOCK
WASHER #8 6
38 050038 GPLASTIC
CAP 1'
(2.54 cm) 2
120 01 01 20 €rr,mmm'mntmfllllÎlltmn SS
SCREW 8-32x2"
(5.1 cm) 1
123 0't0123 û*- SS
SCREW 8-32 x 1-112"
(3.8 cm) 2
232 01 0232 {mmmmmmmmrmmm SS
SCREW 8-32x2-112"
(6.4 cm) 1
411 03041 1ôSS WORM
CLAMP 1 -3/8"
(3.5 cm) 2
412 03041 2ôSS WORM
CLAMP 1-112
(3.8 cm) 2
413 03041 3ôSS WORM
CLAMP 1-314"
(4.5 cm) 2

#2 I ASSEMBLE T'MATCH
79
q.-
q
EB '@-__
<&g
Assemble the T-match to the driven element (EB)as illustrated in figure
B. First attach the UltraMatch to the driven element with the hardrare
shown. Then connect the T-match elements (ET) to the UltraMatch with
the split washers(41) and nuts ( 1 1). 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 thatthe Ul-
traMatch "N" connector
must face the center of the
antenna. Tighten all
screws,
17-3i1 6'
(43,7 cm) 9-1 /1 6"
(23 cm)
FIGURE B
41 i; i
A
H
H
H
H tzs
H
g
."'\ " ,\
ri u\it
KEY P/N DISPLAY DESC stzE QTY
EB tl(l ALUM
TUBING 112" x39-314"
('1.3 x 101 cm) 1
ET lo----.---- ALUM
ÏUBING 3,18" x8-112"
(.95 x 21,6 cm) 2
UM UM2N bUltraMatch
BALUN 4"314" x2-112"
(12 x 6.4 cm) 1
t1 01001 't ffi SS HEX
NUT 8-32 I
26 1 90026 fr ALUM
BRACKET 718"
(2.2cn) 1
41 01 1 941 æSS LOCK
WASHER #8 I
53 050053 i9 PLASTIC
CAP 1t2"
(1.27 cm) 2
77 050077 r9 PLASTIC
CAP 3/8'
(.95 cm) 2
79 01 0079 €ITmmn SS MACHINE
SCREW 8-32x 112"
(1.3 cm) 4
123 01 01 23 {'mTmTlrmrmmn SS MACHINE
SCREW 8-32x1-112
(3.81) 1
125 200125 T-MATCH
STRAP 2
232 010232 SmfinmilflmnTnttntrlm SS MACHINË
SCREW 8-32 x 21 12"
(6.4 cm)
940 360940 eALUM FLAT
WASHER #8 1
(18.3 cm) | (32.4 cm)

KEY P/N DISPLAY DESC SIZE 0w
11 01 001 1ffi SS
HEX NUT 8-32 16
26 1 90026 ft ALUMINUM
BRACKET 7t8"
(2.2cn) 16
tô 1 90028 ALUMINUM
HALF WASHER 1"
(2.U) to
31 01 0231 {tltrtllltrtttl trnnnnmrînrr SS
SCREW 8-32x1-314"
(4.5 cm) 6
41 011941 æSS LOCK
WASHER #8 16
120 01 01 20 SS MACHINE
SCREW 8-32x2"
(3.'l cm) 5
232 010232 {mmmrmimrmrmïrTnnmn SS
SCREW 8-32x2-112"
(6.4 cm) 5
#3 I 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. 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.
TABTE A (Element Lengths)
KEY
..l'.ËA
EB
1l;'..'.Eô':..
ED
.l..'.,,fE.',,.
EF
:: :EG:: ::
EH
lltl,l.l.:gt. ...:.
,F,!, ,
,8K, ,,
,,EL,,,
:: t:Eir;: ::
, ,,EN,,
:: :: ::Ei3::::'
EP
,, ,Fô, ,',
Elemenl
Number
:1. :
:l
1
i"....i..'.lil.l..i.' .. .,,
'l
tt t:tttttl
{.
: l: :
1
. :.)
:: l:: :
1
:l:
1
:{.
::: t:: ::
1
.t:..
: ::i :1:: :l:::
1
.1.
1
. .{I
LENGTH
INGHES CM
.,:,40:3/4:, ,:,:,:, ::, ,::' ::::::::,:' ,::,:, :.:lf$,$
39-314 x 112 101 x 'l .2
38:1Æ 96.8
37-1t4' 94.6
36.tt:lt6 , ,'g3.2
36-3/8 92.4
ii. ::. :. :.
oo 91.4
gs-t glt s 91 .o
3515Æ: :: :: g0.5
35-7116 90.0
r:: 35;1r/4;;: ::;:::::.::::t::: : :::::rr: :r :::: : ,:,r, ,:$$.$:
35:118 , . 89,2
::g+.t i/t e 88.7
,34;,t'3fl.,6 ,, :.. :.:.:. .:::. .:.. ,,' ,, ',,99,4
:,:!l[:$i!,:,:.,: ::.,:::::::':: ::]::: : ,, ,: :.:: ,;:1:1 1:$$:Q
u-7t16 87.5
!!.-114 i , 87.0
FIGURE C
FIGURE D
?:'"!))ei i*-i':-n,. ;:]": ; ;fË "
16
iJ
l.*
lr '< 1 ê-
30-11/1 6', 31-112. 32-1/8.
(81.6 cm) (2.9 cm) (80.0 cm)
DIRECTION OF MAXIMUM SIGNAL {>
i-,*-
'_j t
22-1tA'.: 24-1t4', r- l$"-
(66,0 cm)(56.5 cm) (61.6 cm) 28-1 3/1 61
(73.2 cm) 32-5/1 6"
(82.1 cm)
3/1 6'
3 cm) zt -Jto
(69,5 cm)

t7B2
#4 I ASSEMBLE BOOM TO MAST MOUNT
Assemble and mount the boom to mast clamp bracket (20) between
elements 10 and 11 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 3-1/2 inches (8.9 cm) from
element 10 as shown on figure D. You are now ready to mount the
antenna to your mast using the U-bolts 404. Secure with lock washer
(119) and nut ('118) in that order. Affix the warning label (326) to rhe
boom as shown in figure E.
118
fl
FIGURE E
KEY P/N DISPLAY DESC stzE OTY
84 01 0084 æSS LOCK
WASHER 114"
(.64 cm) 4
85 01 0085 ffi SS HEX
NUT 114"
(.64 cm) 4
104 01 01 04 @SS FI.AT
WASHER 114"
(.64 cm) 4
118 010118 ffi SS HEX
NUT 5/1 6"
(.79 cm) 4
119 010119 æSS LOCK
WASHER 5/1 6',
(.79 cm) 4
401 01 0401 SS
U-BOLT 1 1/2" x 3' (3.8 x 7.6 cm) 2
4M 01 0404 SS
U-BOLT 2112'x3"
(5.5 x 7.6 cm) 2
70 1 90070 MOUNTING
PLATE 4"x6*
(10.2 x 15.2 cm) 1
326 m326 DANGER
LJqBEL 1
#5 I ASSEMBLE BRACES
Assemble the mast braces using figure F. lf you stack two 1782's, you
may opt to place the braces above rather than below the boom . First place
a worm clamp (409) on the slotted end of tubes BH. Then insert the tubes
BJ into the slotted ends of tubes BH, set to the dimensions shown and
tighten the clamps. Next attach the other end of tubes BH to the boom at
the positions shown in figure F using clamps (647), screws (23), washers
(41)and nuts (11)as shown in figure G.
-t. I1" (2.54 cm)
-c14
BOLT
CENTER BOLT
CENTER
1 00'
BOLT
CENTER BOLT
CENTER
KEY P/N DISPLAY DESC SIZE OTY
BH ALUM
TUBING 718" x72"
(2.2 x'183 cm) 2
BJ lol\--.--- ALUM
TUBING 3/4'x 36" 2
11 01 001 1ffi SS HEX
NUT 8-32 I
41 01 1 941 æSS LOCK
WASHER #8 16
123 01 01 23 flnmmrmmmmrn SS
SCREW 8-32x1-112"
(3.8 cm) 8
æ7 1 91 647 l r\l
âBRACE
CLAMP 4
(254 cm)
FIGURE F

#6.BRACE TO MAST ATTACHMENT
KEY P/N DISPLAY DESC SIZE QTY
32 1 90032 U.BOLT
BRACKET 3-518" x2-112"
(9.2 x 6.4 cm) 1
33 1 931 33 \BACKING
PLATE 3-112" x1-118"
(6.4 x 2.8 cm) 1
118 010118 ffi SS HEX
NUT 5/1 6'
(.79 cm) 4
119 0101 1 IæSS LOCK
WASHER 5/1 6'
(.79 cm) 4
405 010405 ss
U-BOLT 2-112" x4-112"
(6.4 x 11.4 cm) 1
Attach the brace clamp to the mast as shown in figure H. First attach
theclamp (32)tothe mastwith U-bolt404, backing plate (33)and one
set of washers (1 19) and nuts ( 1 1 8) as shown. Next set the 24 inch
(61 cm) dimension as shown in figure F and tighten the nuts securely.
Then attach the flattened end of tubes BJ to the U-bolt with washers
(1 19) and nuts (1 18) as shown in figure H andtighten the nuts. lf the
antenna i sn't f lat enough, you may loosen the worm clam ps and adjust
the length of the braces slightly.
FIGURE H
@.@.
- #7 I FEEDLINE ATTACHMENT
When the antenna is in its final location, apply some of the
silicone on the outer threads of the connector on the UltraMatch.
SILICONE SHOULD NOT BESPREADON THE CENTER PIN!
Attach your feedline connector to the UltraMatch. Tape your
feedline down the boom and mast as shown in figure l. lt's a good
idea to provide a drip loop in the coax as shown to help protect
the connector from water damage. Some recommended stack-
ing arrangements are shown on figure J. When you have
completed this section, return to the the tuning section on page
1.
FIGURE I
TAPE FEED LINE
FIGURE .l
11'6"
(3.5 M) 11'6"
(3.5 M)
EOUAL LENGTH 50
COAXIAL CABLE
15' 't-3/4' (4.69 H)
EOUAL LENGTHS
50 Ohm COAXIAL
CABLE 23', 1" (7.04 M)
2 ANTENNA STACK 4 ANTENNA STACK

t782
MASTER PARTS LIST
SPECIFICATIONS
Frequency, MHz
No. Elements
Forward Gain, dBd
Front to Back Ratio, dB
SWR 1.2:1 Typical
2:1 Bandwidth, MHz
Power Rating, Watts PEP
3 dB Beamwidth, Degrees
E Plane
H Plane
144-145
17
18.0
26
>2
2000
2 x 14.5
2 x 15.0
Side Lobe Attenuation,
dB, E Plane
Electical Wavelength
Boom Length, ft (m)
Longest Element, in (cm
Turning Radius, ft (m
Mast Size Range, in cm)
Wind Load, ftt (m.)
Weight, lb (kg)
>60
4.5
31 (e.4s)
40.75 (103.5)
17.25 (5.26)
1.5-2
(3.8-5.1)
3.e (.36)
15.75 (7.14)
)
UMITED WARRANTY
o'nsidè ol lhe Cushcrafi laclory will nullilythis wafianly.
48 PERIMETER ROAD, MANCHESTER, NH 03108 USA
603-627 -7 877 . TE LEX 4949 47 2 . FAX 6A3-627 -17 64
11 010011
26 190026
28 190028
31 01023'l
32 190032
33 193133
38 050038
41 01 1 941
53 050053
70 190070
77 050077
79 010079
84 010084
85 010085
104 010104
116 240116
1 18 0101 't8
119 010119
124 010120
123 010123
125 20012s
232 010232
326 290326
40't 01040'1
404 010404
405 010405
409 030409
411 0304'11
412 030412
413 030413
æ7 191647
940 360940
8-32 stainless steel hex nut
718" (2.2 cm)formed aluminum bracket
Aluminum half washer
8-32 x 1-3/4" (4.4 cm)stainless steelmachine screw
3-5/8" x 2-112" (9.2x 6.4 cm)U-bolt bracket
3-112" (6.4 cm) backing plate
1" (2.54 cm) black plastic cap
# I stainless steel split lock washer
112" (1.3 cm) black plastic cap
4" x 6" (10.2 x 15.2 cm) formed mounting plate
3/8" (.95 cm) black plastic cap
8-32x 112" (1.3 cm) stainless steel machine screw
114" (.64 cm) stainless steel lock washer
114" (.æ cm) stainess sleel hex nut
114" (.U cm) stainless steel flat washer
Silicone Package
5/'16' (.79 cm) stainless steel hex nut
5n 6" (.79 cm) stainless steel lock washer
8-32 x 2" (5.1 cm) stainless sleel machine screw
8-32x 1-112" (3.8 cm) stainless steel machine screw
T-match strap
8-32x2-112" (6.4 cm)stainless steel machine screw
Danger label
1-112" x3" (3.8 x 7.6 cm) stainless steel U-bolt
2-112" x 3" (5.5 x 7.6 cm) stainless steel U-bolt
2-112" x4-112" (6.4 x 11.4 cm)stainless sleel U-bolt
718" (2.2 cm) stainless steelworm clamp
1-114" (3.2 cm) stainless steel worm clamp
1-1/2. (3.8 cm)stainless steelworm clamp
1-314" (4.5 cm)stainless steel worm clamp
Boomer bracket brace clamp
#8 aluminum flat washer
37
17
16
I
1
1
2
46
2
1
2
4
4
4
4
1
I
I
6
11
2
6
1
2
2
1
2
2
2
2
4
1
1" x 64" (2.5 x162.6 cm) aluminum tubing drilled 1
1-114" x 60" (3.2 x 152.4 cm) aluminum tubing 1
slotted, drilled, swaged
1-112" x 72' (3.8 x 182.9 cm) aluminum tubing 'l
slotled both ends, drilled, swaged
1-112" x72" (3.8 x 182.9 cm) aluminum tubing 1
slotted both ends, drilled, swaged
1-114" x 60" (3.2 x 152.4 cm) aluminum tubing 1
slotted, drilled, swaged
1" x 60" (2.5x152.4 cm) aluminum tubing drilled 1
1-3/8" x 12" (3.5 x 30.5 cm)aluminum tubing drilled 1
718" x72'(2.2x182.9 cm)aluminum tubing z
3/4" x 36" (1.9 x 91.4 cm) aluminum tubing z
BF
BG
BH
BJ
EA
EB
EC
ED
EE
EF
EG
EH
EI
EJ
EK
EL
EM
EN
EO
EP
EO
ET
UM UM2N
flattened one end
40-314' (1 03.5 cm) aluminum rod
39-3/4. x 112" (101 x 1 .2 cm) aluminum tube
38-1/8" (96.8 cm) aluminum rod
37-114" (94.6 cm)aluminum rod
36-1 1n 6' (93.2 cm) aluminum rod
36-3/8' (92.4 cm) aluminum rod
36" (91.4 cm) aluminum rod
35-13/16" (91 cm) aluminum rod
35-5/8" (90.5 cm) aluminum rod
35-7116" (90.0 cm) aluminum rod
35-114" (89.5 cm) aluminum rod
35-'l/8" (89.2 cm) aluminum rod
34-15/16' (88.7 cm) aluminum rod
3/-13116'(88.4 cm) aluminum rod
34-5/8" (88.0 cm) aluminum rod
U-7116" (87.5 cm) aluminum rod
U-|14" (87.0 cm) aluminum rod
8-1lT x 3/8" (21.6 x .95 cm) aluminum tube
UltraMatch Balun
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

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