Harris Corporation RF Communications Division XG-100LPA Manuale Utente
14221-1200-4010, Rev. B
43
8.2 ANTENNA INSTALLATION PROCEDURES
Antennas must be installed before completing the radio installation.
8.2.1 Installing NMO Antenna Mounts AN-125001-001, -002, -003 and -004
These NMO style antenna mounts can each be used with several different antenna elements. Only limited
access under the mounting location is typically required. The installation procedure is presented in
Section 8.2.1.3.
8.2.1.1 Standard NMO Antenna Mounts AN-125001-001 and AN-125001-002
These standard ¾-inch NMO antenna mounts require a ¾-inch hole in a relatively flat area of the vehicle
body, with a vehicle metal thickness of between 0.020 and 0.040 inches. AN-125001-002 has a very-low-
loss coax cable (LMR-195 or equivalent).
8.2.1.2 Thick-Roof NMO Antenna Mounts AN-125001-003 and AN-125001-004
Both of these thick-roof NMO antenna mounts use either a ⅜-inch or a ¾-inch mounting hole in a
relatively flat area of the vehicle body, with a vehicle metal thickness of between 0.040 and 0.1875 inches
(
3
/
16
-
inch maximum thickness). AN-125001-004 has a very-low-loss coax cable (LMR-195 or equivalent).
For thick-roof NMO antenna mounts AN-125001-003 or 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 NMO antenna mounts
When using a ¾-inch mounting hole to mount thick-roof NMO antenna mounts
AN-125001-003 or 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.
8.2.1.3 Installation Procedure for Mounts AN-125001-001 through -004
1. Select the antenna mounting location in accordance with the information presented in Sections 1 and
8.1 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.
NOTE
NOTE