ETS-Lindgren 3119 Double-Ridged Waveguide Horn - Manual (Page 31)

Mounting a Model 3106 Series Antenna to a 7-TR
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Retain these two screws for future use; if you remove the Model 3106B from
the 7-TR, you will need to replace these screws to provide support for the
inner ridge of the antenna.
Step 5
On the side of the
Model 3106B with the
antenna connector,
remove the two screws
from the mount plate.
Step 6
Attach mount adapter to the
Model 3106B:
 Using the two screws
removed in Step 4, insert
the screws through the lip
on the vertical part of the
mount adapter and into
the two holes on the
antenna. Tighten to
secure.
 Using the screw removed
in Step 3, insert the screw
through the horizontal
part of the mount adapter
and into the mount block
on the antenna. Tighten
to secure.