User Manual

14221-1200-4000, Rev. A
36
For thick-roof antenna mount AN-125001-004, using a ⅜-inch mounting hole will
require better access to the underside of the mounting location than if a ¾-inch hole is
used. This is because, in the case of a ⅜-inch
hole, the antenna mount’s bushing
assembly must be inserted from the underside of the mounting surface.
When using a ¾-inch mounting hole to mount thick-roof antenna mount AN-125001-
004, the thickness of the mounting surface must be at least ⅛-inch (0.125-inch
minimum thickness). This requirement is due to the thickness of the alignment ring
used to center the bushing assembly within the ¾-inch mounting hole.
6.2.1.3 Installation Procedure for Mounts AN-125001-002 and -004
1. Select the antenna mounting location in accordance with the information presented in Sections 1 and
6.1 of this manual. If necessary, contact the Technical Assistance Center for assistance. See page 21
for TAC contact information.
2. Verify no obstructions exist immediately below the respective mounting location on the underside of
the vehicle body, such as vehicle ribbing/body framing, a wiring harness, air bag equipment, etc. Also
verify there is a sufficient access path and clearance for the mount’s coax cable. If there is an
obstruction or insufficient clearance, select another nearby mounting location.
3. Measure and mark the center point of the selected antenna mounting location. Be sure to center the
mark from side-to-side of the vehicle.
4. Obtain a hole saw specifically designed for drilling NMO mounting holes of the required diameter.
(e.g., Antenex/Laird Technologies model HS34 or equivalent for a ¾-inch hole; Antenex/Laird
Technologies model HS38 or equivalent for a ⅜-inch hole).
5. If the vehicle’s headliner panel, carpet, seats, or otherwise, is below the mounting location, move or
remove the headliner panel, etc. as necessary to protect it. Alternately, apply a heat-resistant mask
material (such as a fiberglass mat or thin sheet metal with masked edges) as required to “catch” the
metal shavings and the metal plug (if any) produced by the hole saw. The plug (if any) may be
relatively hot if/when it drops out of the saw upon completion of the hole drilling process. ⅜-inch
diameter hole saws generally produce only shavings, not plugs.
6. With the hole saw and a drill, drill a hole at the marked hole center point. Position the drill square to
(i.e., 90 degrees from) the vehicle mounting surface so paint immediately outside of the perimeter of
the hole is evenly removed.
Excessive use of the hole saw and/or failure to position the drill “square” with
(i.e., at a 90-degree angle from)
the vehicle mounting surface may result in
damage to the metal mounting surface, in the area immediately outside of the
perimeter of the hole.
7. Ensure the saw removed the paint immediately around the hole as the drilling operation completes. If
not, do so by reinserting the saw completely into the hole and spinning it as required. This allows
proper grounding via the mount’s lock nut on the top of the mounting surface. On the bottom of the
mounting surface, the “teeth” of the mount’s bushing assembly may not provide a good ground due to
thick vehicle undercoating, thick primer, oxidation/rust, etc.
NOTE
CAUTION