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Attaching the feed horn and
transition to the radio
The feed horn and waveguide transition are shipped from the
factory pre-attached, as shown in Figure 28.
assembly
O-ring
groove
Figure 28: Feed horn with waveguide transition attached
Attach the square end of the waveguide transition (with the feed
horn attached) to the radio assembly—specifically, to the
transmit/receive isolation assembly, or TRIA:
1. Apply silicone grease to the O-ring groove in the waveguide
transition. See Figure 29.
The silicone grease is provided in a small plastic capsule.
2. Place the O-ring (1-inch inside diameter) in the O-ring
groove in the square end of the waveguide transition.
Note: The O-ring and small hardware for the square end of
the waveguide transition are shipped in a bag that contains
four socket-head cap screws.
Figure 29: O-ring in groove in waveguide transition
Waveguide
transition
O-ring
Chapter 4 • Installing a J-type radio assembly
1037312-0001 Revision A
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