Sigtronics MRIM-2 - Manual (Page 2)

mOBIlE RADIO INTERFACE mODUlE INSTAllATION
INSTAllATION OvERvIEw:
Sigtronics has simplified the installation process, to assure perfect
operation. Refer to the Mobile Radio Interface Module Wiring Diagram
see Figure 2 on page 4. If you have any installation questions or problems
that are not addressed in this manual, feel free to call our installation hot
line number located on the last page of this manual.
Installation of the Sigtronics Mobile Radio Interface Module is a four
step process:
I. MODULE CHASSIS INSTALLATION
II. HEADSET JACK AND PTT SWITCH INSTALLATION
III. HEADSET JACK AND PTT SWITCH WIRING
IV. RADIO HOOK UP
I. mODUlE CHASSIS INSTAllATION
mODUlE plACEmENT:
The Mobile Radio Interface Module is designed to be remote mounted
behind the dash or panel with four screws mounted through the grommets
on the back of the chassis. Because the Interface Module connects to the
radio, select a mounting location near the emergency radio controls.
Make sure that the transmit mic level adjustment holes on the side of
the Radio Interface Module chassis can be easily accessed for adjustment
with the Module in place. Make sure that neither the Module or cable
interfere with the normal operation of the vehicle.
mOUNTING RADIO INTERFACE mODUlE CHASSIS:
1. Remove the four corner panel screws (the smaller ones) from the
top of the Module. Remove the unit from the chassis.
2. Set the Module chassis in the intended mounting place. Using a
small point pen or marker, mark the hole pattern through the four
grommets located on the bottom of the Module chassis.
3. Drill four holes using a 5/32 inch drill (clearance for a 6-32 screw).
4. Secure the Module chassis to the vehicle using the four screws and
locking nuts supplied. Be sure to install the screws with the screw
heads inside the Module chassis. This should assure that these
mounting screws will not touch the Module circuit board when in
place. Do not tighten the nuts and screws so tight as to excessively
crush the grommets.
5. Replace the Module circuit back into the chassis. Make sure that the
transmit mic level adjustments line up with the holes in the Module
chassis. Be sure not to pinch any wires under the panel. Replace the
4 corner panel screws and tighten.
6. Plug the Module unit plug P1 into the mating connector J1 on the
Interface Cable.
II. HEADSET JACK AND pTT SwITCH INSTAllATION
HEADSET JACK plACEmENT:
It is assumed that it has already been determined in what general area on
the vehicle the headset and PTT switch will be located. To determine the
exact position, it is helpful to have a headset handy to physically gauge
the best place for the jack. There are several things to consider when
selecting a place to mount the headset jack:
1. In general, the headset jack placement and headset cable should
not interfere with the normal operation of vehicle doors or
compartments.
2. The jack position should also take into account how the headset
cord will hang when the headset is in use. The cord should hang
out of the way and should not interfere with vehicle controls.
3. The headset jack should be out of the way so that the headset plug
can’t be hit during use or when entering or exiting the vehicle.
4. For a headset position inside the vehicle, the jack should be placed
towards the middle of the vehicle. It should also be placed up above
and towards the back of the user’s head. This will assure that the
headset cord will not hang between the user and the vehicle door.
Sigtronics provides two ways to mount the headset jack for the Mobile
Radio Interface Module:
1. Mount the jack in the supplied blue jack box. Advantages:
a) Little or no “behind the panel” space required.
b) No vehicle panel thickness limitation.
c) Smaller holes are required to be drilled - a real advantage on
vehicles with thick metal panels.
d) Complete electrical isolation of the jack from the vehicles chassis,
because the jack box is fabricated out of non conductive high
impact plastic.
2. Mount the jack directly on the vehicle with a “through the panel”
mounting scheme. Advantages:
a) Smaller space requirement. (Only slightly larger than the jack
itself).
b) Only one hole to drill (1/2 inch).
c) Most of jack is behind panel and out of the way. Sigtronics
recommends that you use the jack box mounting method, but
either approach can be used.
SplASH COvER:
If a jack is to be mounted outside the vehicle (ie. on or near a fire engines
pump panel), a splash cover should be used to keep excess moisture out
of the jack when it is not in use. Every Mobile Radio Interface Module
comes with one such splash cover already pre-mounted on a jack in a
mounting box. In applications, where the headset is always plugged in,
a splash cover is not required.
JACK BOx mOUNTING:
Place the jack box on the mounting surface and mark and drill the
corresponding mounting holes into the vehicle using a 1/8 inch drill.
Mount the jack box to the vehicle with the provided #10 screws. The
screws require a 5/16 inch hex driver.
For most installations the wiring for the headset jack will come out the
back of the jack box. A hole is already provided in the jack box for this
purpose. Of course, you will also have to drill a similar hole into the vehicle.
Use a 5/16 inch drill for this.
RING
BARREL
SHOULDER
INSULATING
WASHER
FLAT
INSULATING
WASHER
FLAT
METAL
WASHER
VEHICLE
PANEL
HEADSET JACK
TIP
NUT – OR – SPLASH COVER AND NUT
Figure 1
page 2 Sigtronics MRIM-2 www.sigtronics.com