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Installing the radio
assembly
circular polarization
To mount the radio assembly to the feed support arm:
1. Place the two adapter brackets on the feed support arm as
shown in Figure 18.
Figure 18: Attaching the radio assembly
2. As shown in the figure, position the radio assembly above the
adapter brackets so that the waveguide end of the radio is
nearest to the reflector.
3. Lower the radio onto the adapter brackets and insert one
½-inch × 1.75-inch bolt, with 5/16-inch flat washer and lock
washer up through the feed support arm and adapter bracket,
into each of the two the threaded sockets in the radio
transmitter.
4. Tighten both bolts to secure the radio to the feed support arm.
Adjusting
It may be necessary for you to reposition the polarizer waveguide
on the radio assembly to set the proper polarization between the
radio transmitter and the antenna reflector. Before proceeding,
check the installation reference sheet to determine whether the
installation calls for left-hand circular polarization (LHCP) or
right-hand circular polarization (RHCP).
Once you determine which polarization setting is required, check
the position of the polarizer waveguide on the radio to determine
whether an adjustment is necessary. From the rear of the radio,
looking toward the reflector, you can easily determine whether
the polarizer is currently set for LHCP or RHCP by the way it
leans. (See Figure 19.)
Note: There is no default factory setting for transmit
polarization. Radios can be shipped with either setting.
Chapter 3 • Installing the antenna and radio assembly
1037750-0001 Revision A
25
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