INSTALLATION OF REFLECTOR, SPARS, SUBREFLECTOR, AND FEED
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42S183D
SERIES 8116/8118 16-/18-METER EARTH STATION ANTENNA
4-23
When all of the trusses are assembled, installed, and aligned, the antenna
structure is ready for the panel installation. There are four rows of
panels for the 18-meter antenna (rows A, B, C, and D). There are three
rows of panels for the 16-meter antenna (rows A, B, and C). The inner
row of panels (row A) is installed first, then the next row, and so on until
all rows of panels are installed. Perform the following procedure to
install the panels on the trusses. (Refer to Figure 4-5 for the 18-meter
antenna or Figure 4-6 for the 16-meter antenna.
Installation of Panels
1. Place A panel (item 1) on threaded rods at position closest to hub as
shown in Figure 4-5 or 4-6.
a. Remove existing screw, nut, and washers supplied with panel
assembly and discard.
b. Insert wedge (item 7) under narrow end of, and between, two A
panels. Then secure panel to hub using two screws (item 13),
two washers (item 14).
2. Secure panel to rods using two flat washers (item 12) and two hex
nuts (item 11). (The set dimensions shown in the figure are for a
crude setting.)
3. Roughly align panel by moving threaded rod up or down with nuts on
truss. Sight the outer corners of each panel using the theodolite and
data provided in paragraph 3 of 479821. Set both corner’s height to
the angles shown. Set the panel laterally by sighting one corner using
the nominal azimuth angle less the offset for the gap.. (This will
minimize the final adjustments.)
4. Repeat steps 1 through 3 for the remainder of the panels on the first
row spacing panels 1/8 inch (0.32 cm) apart. Align panels to panels
on either side.
5. Place B panel (item 2) on threaded rods at next position spaced 1/8
inch (0.32 cm) out from A panel.
6. Secure panel to rods using two flat washers (item 12) and two hex
nuts (item 11).
7. Align panel flush to first row/adjacent panels by moving threaded rod
up or down with nuts on truss. Align outer corners using theodolite
as in step 3.
8. Repeat steps 5 through 7 for the remainder of the panels on the
second row. Align panels to panels on either side.
9. Starting at a position 37.5° up from center line of antenna (see Sheet
1), place left-hand spar attachment C panel (item 5) on threaded rods
at next position spaced 1/8 inch (0.32 cm) out from B panel.
10. Secure panel to rods using two flat washers (item 12) and two hex
nuts (item 11).
