Installation Guide

First InterComm ™ System Installation Guide
Page 8 A29799
November 2007
3.3.3 Land Mobile Radio Antenna
The LMR antenna must match the frequency of the specific VCA100 model being
installed on the vehicle. Ensure that the new LMR antenna is not installed in close
proximity to any existing LMR antennas.
We recommend keeping the antenna at least 12 inches away from any light bars,
antennas, or other roof-mounted equipment and MUST be installed so as to provide a
separation distance of at least 18 inches (45 cm) from all persons.
3.3.4 Power and Fuse
The vehicle’s main power source is connected to the VCA100 by the DC power cable
(red) that passes through an inline fuse. Locate the fuse as close as possible to the
power source and splice it in with weatherproof butt splices (SUPPLIED). Mount the fuse
assembly (Figure 5) to facilitate maintenance. Splice the power line to the VCA100
power harness (SUPPLIED) using the step-down splice (SUPPLIED) to accommodate the
dissimilar wire gauges.
Figure 5. In-Line Fuse
3.3.5 Manual Switch
A second, low current, power line (orange) must run through a cab-mounted manual
toggle switch to the VCA100 S
ENSE input (pin 2). This switch is not supplied in the
deliverable installation kit because User-specific vehicle installations vary; i.e., switch
location is a function of User requirements and vehicle constraints. An illuminated
manual switch, appropriately labeled, is recommended. Connect the switch to a
1-ampere fuse-protected vehicle power source.