Select the element-to-boom insulator (Item No. 21),
two sections of the 7/16" x 17 1/4" Driven element
(DE) (Item No. 3) and the beta rod (Item No. 4). See
Figure 4.
Use the #10-24 x 2 1/2" bolt (Item No. 29) to fasten
the element-to-boom insulator to the boom. Refer to
Figure 4. Use a lockwasher and 2 nuts to secure.
Select the rods from the table below. Mark the center
point on each rod, then make two more marks 5/8" on
either side of the center mark. Secure the elements to
the boom as shown in Figure 3. Be sure they are
oriented as shown. When all elements are installed,
loosen the boom-to-mast clamp then twist the front
boom to align the elements, then retighten the boom-
to-mast clamps.
Use the two (2) #10-24 x I I/2" bolts (Item No. 28) to
assemble the Driven Element as shown in Figure 4.
Pay particular attention to the connections of the beta
rod, balun and feedline. The beta rods will bend
slightly as the screw (item 26) is tightened.
Use the #10 x 3/8" screw (Item No. 26) to fasten the
beta rod shorting clip (Item No. 22) over the beta rod
as shown in Figure 4.
Slip the two U-bolts (Item No. 35) into the boom-to-
mast bracket and fasten it to the mast securely. Use
black electrical tape or black tie-wraps to secure the
coax feedline and balun to the boom and to the mast.
Be sure to insulate any connections from the boom or
the mast. This completes the assembly procedures.
TUNING
Waterproof the coax connection with Coax-Seal® or
some similar substance. Install caplugs on the ends of
the boom and the Driven Element.
Coax-Seal is
a registered trademark of Universal Electronics
Inc.
Driven Element: SWR can be lowered to less than
1.2:1 at a desired frequency by carefully trimming the
driven element. Keep the element symmetrical by
cutting the same amount from each side. Typical SWR
curves and a cutting chart are shown in Figure 6. Each
installation is slightly different, so cut the driven
element for the lower SWR at your particular location.
Measure the SWR as close to the antenna as you can
for accurate results. The SWR should be measured
with the mast at right angles to the elements.
Element Description
Length
Item No.
D1
34 3/4" (883 mm)
8
D2
l
34 5/8" (879 mm)
9
D3
34 1/2" (876 mm)
10
D4
34 3/8" (873 mm)
11
D5
34 1/4" (870 mm)
12
D6
34 1/8" (867 min)
13
D7
34" (864 mm)
14
D8
D9
33
33
7/8" (860
3/4" (857
mm)
mm)
15
16
D 10
33 5/8" (854 mm)
17
D11
33 1/2" (851 mm)
18
D 12
33 3/8" (848 mm)
19
Element Table
