TM 11-5985-335-15
d.
Tighten the crosshandle bolts on the antenna backmount as illustrated in figure 2-5.
e.
Insert the feedhorn through the circular opening in the antenna reflector. Turn the feedhorn assembly so
that the index arrow on the feedhorn mounting plate matches the appropriate polarization index arrow on the reflector, as
shown in figure 2-6.
f. Mount the feedhorn to the reflector with the four wingbolts as shown in figure 2-7. Stow the feedhorn flange
cover plate, using the stowage bolt holes near the flange.
g.
If use of the deicer equipment is anticipated, connect ac power (115 volts, 60 Hz) at the power connector
(shown covered in fig. 2-7) on the feedhorn assembly.
h.
Clamp one 4 1/2-foot section of CG-3251/GRC flexible waveguide to the feedhorn (fig. 2-8). A clamp is
provided on the waveguide section. Stow the flexible waveguide cover in the clip provided on the waveguide.
i. Attach shackles to backmount eyebolts. Attach four purple-coded cables to shackles. Attach the four tensioners
to the free end of the cable assemblies. Figure 2-6 shows the guy cable arrangement for the antenna with the antenna
extension kit.
j. Clamp one 15-foot section of CG-3307/GRC flexible waveguide to the 4 1/2-foot section of CG-3251/GRC
flexible waveguide. The clamp is provided on the 15-foot waveguide section.
CAUTION
Make sure that the guy cables are manned when raising the AS-1425/GRC.
k. Attach waveguide clamps (fig. 2-10) and additional waveguide sections as the mast is being raised.
l. Complete the waveguide run (and power cable run, if used) to the shelter, using cable hanger assemblies as
required with the messenger cable.
Change 2
20.2
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