TERION UM20-100111B, Installation Manual, Page: 30 / 78

2. Use the antenna base plate and the support bracket as guides to mark hole locations.
Start the holes with a center punch and then drill four 25/64" holes. Insert 1/4" - 20
rivnuts into the holes and cinch tight with a rivnut tool.
3. Attach the antenna base plate and upper support bracket using rivnuts and 1/4" - 20 x
1" bolts, 1/4" internal diameter (ID) star washers and 1/4" ID flat washers. Place a
9/16" grommet in the antenna guide hole in the support bracket, then hold the bracket,
and secure it in place. Be sure to use a fender washer on the upper support
attachment fastener.
4. Place the rubber washer, and then the curved lock washer, on the stud mount bolt.
Note: It is ESSENTIAL that the curved lock washer be placed so
that it curves towards the rubber washer (refer to the illustration on
page 4-12).
5. Place the stud mount assembly into the base mount bracket, put the star washer on the
stud mount shaft, and then thread the stud mount nut about half way up the shaft.
Note: When applying Loctite, only a small amount is required.
6. Apply a small amount of Loctite 242, or similar locking compound, to the threads that
will be covered by the stud mount nut when it is fully tightened.
7. Tighten the stud mount nut finger tight, and then use a wrench to tighten it another
3/4 turn to 1 turn . This should result in a torque of approximately 10 foot-pounds.
8. Guide the top end of the antenna through the antenna upper support bracket. Install a
split lock washer onto the stud, and then fasten the antenna to the stud mount
assembly. Use wrenches to tighten the connection. When secure, grab the antenna
by hand and try to turn it. If the antenna stud mount turns,
it is too loose and needs
to be tightened (see the previous step).
4-14
Mobile Messaging System Installation Manual June 15, 2001
UM20-100111B Terion, Inc.