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#4 - RF CHOKE
A feedline should be prepared as shown in Figure H using the
solder terminals (453) provided. A 1:1 balun may be installed
at the feedpoint but it is not required. We recommend using
an RF choke made from 8 turns of RG8U coaxial cable with 6
inch (15.2 cm) diameter. Important - Do not use foam dielectric
coax for your RF Choke because when the coax is wound in
a coil the center conductor may migrate away from the center
and detune your choke. Attach th RF choke to the driven
element using washers (41) and nuts (11) as shown in Figure
H. Be sure to tape and seal the feedline against water at the
point where the center dielectric and braid separate. Tape the
feedline, between the feedpoint and the RF choke to the boom.
Tape the RF choke to the mast. If you plan to install the antenna
in a salty or corrosive environment, you may want to consider
coating all elements with a clear marine varnish or its equivalent
after it is assembled.
KEY
P/N
DISPLAY
11
010011
41
011941
453
100453
#5 - BOOM TO MAST ASSEMBLY
KEY
P/N
DISPLAY
63
170063
118
010118
119
010119
404
010404
130
190130
326
290326
DESC
SIZE
HEX
#8-32
NUT
SPLIT LOCK
#8
WASHER
TERMINAL
DESC
SIZE
V-BLOCK
2"
(fits 404 U-Bolt)
(5.1 cm)
HEX
5/16"
NUT
(.8 cm)
LOCK
5/16"
WASHER
(.8 cm)
U-BOLT
2-1/8 x 3"
(5.4 x 7.6 cm)
MOUNTING
3/16" x 6" x 6"
PLATE
(.48 x 15.2 x 15.2 cm)
DANGER
LABEL
A4S
FIGURE H
BOOM
453
41
4"
11
(10.16 cm)
QTY
Electrical
2
Tape
2
2
Warning: Do not use foam
dielectic coax cable.
Attach the boom to your mast as shown in Figure I. First attach the
QTY
mounting plate (130) to the BA section of the boom using U-bolts
(404), washers (119), nuts (118), and V-blocks (63). Attach the
4
mounting plate to the mast using the U-bolts (404), V-block (63),
washers(119) and nuts (118). Return to the tuning section on page
8
1 for final checkout and tuning procedure.
8
FIGURE I
4
1
130
1
119
118
63
404
404
118 119
6
Electrical
Tape
8 Turns
MAST
118
119
63
63
63
326
119
118
453
41
11
6"
(15.2 cm)
404
118
119
118
119
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