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2. Mount the jacks 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 per jack ( ½ 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 as well as a combination of both.
If required, additional headset jacks, PTT switches, mounting boxes,
and hardware are available through your Sigtronics dealer.
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 UltraSound
system comes with one such splash cover already pre-mounted on
a jack in a mounting box. On other positions, where the headset is
always plugged in, a splash cover is not required.
Jack Box Mounting:
Set the jack box on the mounting surface in the selected area and
mount with two of the hex head self drilling screws. For most appli-
cations* these screws can be installed with no pre drilling. Just power
in the screws with a standard electric driver with a 5⁄16 inch hex bit.
* No pre drilling required for aluminum and steel. A
1⁄8
inch pilot hole
will still be required with some stainless steels.
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.
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. Rubber wire grommets are provided for the wire going
through the jack box hole.
Through the Panel Mounting:
For direct mounting of headset jacks on the vehicle panel you will
need to remove the jack from the jack box cover with a ½ inch
wrench. For normal jack mounting (no splash cover), the maximum
panel thickness is 0.10 inches or a little less than 1⁄8 of an inch. If you
need the splash cover (optional), the maximum panel thickness is
0.062 inches or 1⁄16 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
inches with splash cover and 0.195 inches without).
Mounting on the panel requires that you insert the jack from the back
of the panel. Test jack(s) 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 ½ inch hole in the panel. Install jack with mounting washers
and nut as in Figure 3. Both jack insulating washers must be used.
The Jacks have to be insulated from mounting spot to minimize
electrical noise getting into intercom system. No need to tighten
the jack now. You may have to remove the jack to connect the wires.
PTT Switch Installation:
In order for the Driver or Officer positions to transmit on the radio,
they will each need a Push-To-Talk (PTT) switch.
The PTT switches should be placed within easy reach of the users. It is
also helpful if they can be easily seen by the users. The PTT switches
can be mounted in the blue ptt mounting boxes or directly into a
panel. If using the ptt boxes, set the box on the mounting surface in
the selected area and mount with two of the hex head self drilling
screws. For most applications* these screws can be installed with no
pre drilling. Just power in the screws with a standard electric driver
with a 5⁄16 inch hex bit.
* No pre drilling required for aluminum and
steel. A
1⁄8
inch pilot hole will still be required with some stainless steels.
If mounting the PTT switches directly into a panel the switch is
mounted from the front and the panel can have a maximum thick-
ness of 3⁄16 of an inch.
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 inch wrench
III. HEADSET JACK AND PTT SWITCH WIRING
The wiring of the headset jacks and PTTs is straight forward. In
general, the 4 foot Headset Jack and PTT Switch Cable gets wired to
the six conductor Hook-up Wire (gray) and then the Hook-up wire
connects to the jacks and the PTT switches. The cable J1 for the four
radio transmit positions has a 12 pin connector with 12 wires. Before
going on, plug in J1 of the cable into P1 on the Intercom unit. The
cable for the eight other headset positions
(J4)
has a 9 pin connector
with 9 wires. Plug this J4 connector into P4 on the Intercom unit.
Flexible six conductor hook-up wire is provided with each system to
connect each headset jack and PTT switch to the UltraSound unit’s
Headset Jack and PTT Switch Cables. Enough wire is provided for a
typical vehicle installation. If required, additional hook-up wire can
be purchased through your Sigtronics dealer.
Each headset jack requires three wires. Each PTT switch requires
two. If an Officer’s PTT switch and headset jack are mounted near
each other, only four wires are needed.
Refer to the UltraSound Wiring Diagram for the exact wiring infor-
mation. Figure 4 for US-12S and Figure 5 for US-12D intercoms.
RING
MIC AUDIO
BARREL
COMMON
RETURN
SHOULDER
INSULATING
WASHER
FLAT
INSULATING
WASHER
FLAT
METAL
WASHER
VEHICLE
PANEL
HEADSET JACK
TIP
HEADPHONE
AUDIO
NUT – OR – SPLASH COVER AND NUT
FIGURE 3
