Alternately, the wire can come out of the side of the jack box if desired. You
will have to drill the hole where required. Use a 5/16 inch drill. A rubber
wire grommet is provided for the wire going through the jack box hole.
THROUGH THE PANEL MOUNTING:
For direct mounting of the headset jack on the vehicle panel you will
need to remove the jack and the splash cover from the jack box cover
with a 5/8 inch wrench. For normal jack mounting (with splash cover),
the maximum panel thickness is 0.062 inches or 1/16 of an inch. If you do
not need the splash cover, the maximum panel thickness is 0.10 inches
or a little less than 1/8 of an inch. NOTE: Longer headset jacks that can
accommodate thicker panels are available from your Sigtronics dealer
(order part number 100418 - maximum panel thickness 0.155” with splash
cover and 0.195” without). Mounting on the panel requires that you insert
the jack from the back of the panel. Test jack for clearance and fit. Leave
room behind - the jack expands when headset plug is inserted. Make
sure the back of the jack does not interfere with any moving parts of the
vehicle. Drill a 1/2 inch hole in the panel. Install the jack with mounting
washers, splash cover, and nut as in Figure 1 on page 2. Both jack insulating
washers must be used. The jack has to be insulated from mounting spot
to minimize electrical noise getting into the Interface Module system.
No need to tighten the jack now. You may have to remove the jack to
connect the wires.
PTT SWITCH INSTALLATION:
In order to transmit on the radio, you will need a Push-To-Talk (PTT)
switch either on the headset or mounted on the vehicle. If the PTT switch
is already incorporated on the headset as on Sigtronics SE-2P, SE-8P, or
SE-18P headsets, no other PTT is required. If you are using a standard
Sigtronics headset (without a PTT switch on the shell) you will need to
install the included PTT switch on the vehicle to transmit on the radio. If
applicable, use the following to install the PTT switch:
The PTT switch should be placed within easy reach of the user. It is also
helpful if they can be easily seen by the user. As with the headset jack,
you can leave the PTT switch in its mounting box and mount the box
to the vehicle or remove it and install the PTT switch directly on the
vehicle panel. To mount box with switch follow the “Jack Box Mounting”
instructions on this page.
For direct panel mounting of the switch, the maximum panel thickness
is 3/16 of an inch. The PTT switches are mounted through the panel from
the front. In the selected spot, drill a 5/8 inch hole. Mount the switch into
the hole, but only loosely install the provided lock washer and nut from
the back. The PTT switch will likely have to be removed to connect the
wires later. The nut requires a 7/8” wrench.
III. HEADSET JACK AND PTT SWITCH WIRING
The wiring of the headset jack and PTT is straight forward. In general,
three of the 4 foot Interface Cable wires get connected to the Hook-up
Wire (gray) and then the Hook-up wire connects to the jack and the PTT
switch (if applicable). Enough hook-up wire is provided for a typical
vehicle installation. If required, additional hook-up wire can be purchased
through your Sigtronics dealer.
The 4 foot Interface Cable has a 12 pin connector with 11 wires in it.
Before going on, make sure that you have plugged in J1 of the cable
into P1 on the Module.
The headset jack and PTT switch requires just three wires. Refer to the
Mobile Radio Interface Module Wiring Diagram (see Figure 2) for the
exact wiring information.
The connections between the Interface Cable and the hook-up wire should
be soldered and insulated for reliability. Do not use crimp type splices.
They can become intermittent over time. Use a good quality electrical tape,
or better yet, use heat shrink tubing to cover the soldered connections.
The connections to the headset jack and PTT switch will also have to be
soldered. See Figure 1 on page 2 for jack terminal identification. We do
not recommend using screw type terminal strips for headset jack and
PTT connections. There have been several instances where terminal strips
introduced high levels of electrical noise like alternator whine into the
system. It is acceptable however to tie the MRIM-2 red and green power
wires to existing vehicle terminal strips.
The best place to run the wiring between the unit and the jack and PTT
switch is out of sight. It should be run behind vehicle panels and/or up
in the headliner. This will reduce the chance of personnel or equipment
catching on or damaging the wiring. Wire routing should take into account
normal vehicle operations. Wires should not interfere with any of the
vehicle’s controls, compartments, or doors. If the vehicle’s cab tilts up
for engine servicing, run wiring along the existing vehicle wiring bundle.
Make sure that wiring does not interfere or restrict the tilting operation.
Also, make sure that the tilting operation will not cut or sever the wiring.
Make sure that the wiring does not rest on sharp edges. Over time the
vehicle’s vibration may cause a sharp edge to cut into the wire. Use the
provided wire grommets where the four conductor wire goes through
the holes in the jack boxes. Use wire ties or tie wraps to secure and strain
relieve the wire.
At this time do not put the covers on the jack boxes or tighten up the
PTT switch (if applicable). You will need to verify the correct operation
of the system before you close everything up.
POWER CONNECTIONS:
The Mobile Radio Interface Module will run on 11-16 VDC.
CAUTION: This Module is designed for negative ground vehicles only.
It can be used on positive ground vehicles only if a Sigtronics Positive
Ground Adapter is used. Contact your Sigtronics dealer on pricing and
availability.
Make sure that the vehicle power is turned off before connecting the
Mobile Radio Interface Module power wire. The power for the Module
comes in on the red (pin 7) and green (pin 8) wires on the Interface Cable.
Connect the red wire to vehicle power. (Try not to use a power buss that
also runs electrical motors such as fans or light bars with rotating lights.)
Connect the green wire to the vehicle chassis ground.
IV. RADIO HOOK UP
The connection of the Mobile Radio Interface Module to the vehicle’s
radio should be done by someone familiar with the radio such as your
radio installer. Refer to the Mobile Radio Interface Module Wiring Diagram
- Figure 2. Only the radio functions are shown for the radio end of the
Interface Cable. Because the connectors used by radio manufacturers
varies widely, you will have to consult the radio manual or manufacturer
for the connectors and pin assignments used. Sigtronics has extensive
radio interface experience and can assist with any question you might
have concerning this or any other aspect of the Mobile Radio Interface
Module. See our installation hot line number located on the last page
of this manual.
Using the radio manuals and the Mobile Radio Interface Module Wiring
Diagram, identify the correct signal wires or connector pins to attach the
respective Mobile Radio Interface Module wires. For most radios, these
connections are at the back of the radio or radio control head. For some
radios, the only place to connect the MIC HI and LO and PTT HI and LO
wires is to the hand-held microphone connector.* It is best to wire in such
a way that the radio hand microphone can still be used as normal. Make
sure that you do not physically tie the Mobile Radio Interface Module MIC
LO and SPEAKER LO wires to the same pin on the radio, even if they are
tied together inside the radio. As in the headset wiring, the connections
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