Sigtronics US-12D - Manual (Page 4)

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 (i.e. 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 applications* these screws can be installed with no pre
drilling. Just power in the screws with a standard electric
driver with a 5/16” hex bit.
* No pre drilling required for aluminum and steel. 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
1/2 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” 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(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 1/2 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 mount-
ing 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 applica-
tions* these screws can be installed with no pre drilling. Just
power in the screws with a standard electric driver with a
5/16” hex bit. * No pre drilling required for aluminum and steel.
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 maxi-
mum thickness 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”
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 four 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 con-
nector 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 four 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 US-12S see Figure
4, for US-12D see Figure 5) for the exact wiring information.
The connections between the Headset Jack and PTT Switch
Cables and the hook-up wire should be soldered and insu-
lated for reliability. Do not use crimp type splices. They can
become intermittent over time. Use a good quality electri-
cal tape, or better yet, use heat shrink tubing to cover the
soldered connections. The connections to the headset jacks
4
RING
BARREL
SHOULDER
INSULATING
WASHER
FLAT
INSULATING
WASHER
FLAT
METAL
WASHER
VEHICLE
PANEL
HEADSET JACK
TIP
NUT – OR – SPLASH COVER AND NUT
FIGURE 3