Sigtronics US-DR User Manual
Sigtronics UltraSound Emergency Intercom System
INSTALLATION AND OPERATING INSTRUCTIONS
Models US-45S, US-67S, US-45D, and US-67D
US-45S
US-45D
INTRODUCTION
ATTENTION INSTALLER: To assure a trouble free installation, please read these entire instructions through once
before beginning.
The Sigtronics UltraSound Emergency Intercom System,
when used with Sigtronics noise attenuating headsets
provides the emergency apparatus crew with clear, hands
free, voice activated (VOX) intercom. The system also allows
full radio monitoring at all headset positions as well as radio
transmit capability from selected headsets via Push-To-Talk
(PTT) switches.
Applications: The unit is designed for fire apparatus, rescue
and ambulance vehicles, marine emergency equipment,
airport ground vehicles, and mobile emergency command
centers.
igtronics
S
®
Specialists in “SOUND” Management
178 East Arrow Highway, San Dimas, CA 91773 ( 909 ) 305-9399
Voice Activated Intercom (VOX) feature allows “hands
free” communication between headsets connected to the
UltraSound unit. Start speaking and the intercom turns on
instantly to relay your message clearly to the other headsets.
Stop talking and it turns off to reduce background noise.
Up to Four Headset Positions can be connected to the
UltraSound unit models US-45S and US-45D. Up to six for
models US-67S and US-67D. More headset positions can
be achieved by wiring additional jacks in parallel. Only one
headset, however, can be plugged into paralleled jacks at
one time. This paralleled jack scheme is most commonly
used on pumper trucks at the pump panel. In this case, the
Driver plugs his head- set into his jack while driving. He then
unplugs and plugs into the pump panel when he arrives on
scene.
Made in the U.S.A.
Headphone Output:
ULTRASOUND INSTALLATION
The UltraSound system is designed to easily drive six or more
300 to 1000 ohm headsets. Noise attenuating, full cushion
headsets, such as the Sigtronics SE-8, or SE-48 are recommended for best results. The UltraSound system incorporates
an automatic headphone limiting circuit to eliminate the possibility of painful spurious radio or noise spikes from getting
to the headsets and into your ears.
Universal Radio Interface is designed to accommodate
virtually any type of communication radio. Adjustments for
radio receive level and transmit microphone level are provided to perfectly match the UltraSound system to your particular radio.
Automatic Sidetone Generation allows everyone on the
vehicle to hear both sides of the radio conversations.
Excellent RF Immunity guarantees clean, clear, radio communications.
Standardized for use with Sigtronics single plug headsets
(ie. SE-8, SE-48, SE-18).
Model Differences:
The US-45S is used in applications requiring up to four persons at one time on intercom. Two of the four have radio
transmit capability. The US-45S is designed for use with a
single vehicle radio. The US-45D is identical to the US-45S
but can accommodate two separate vehicle radios.
The US-67S is for single radio operations and can intercom
up to six people at one time. Three of the six can transmit on
the vehicle radio. Similarly, the US-67D is just like the US-67S,
but with dual radio capability.
CONTROL FUNCTIONS
Standard Equipment Included
Besides the Intercom unit, each UltraSound system comes
complete with the following:
US-45S/45D US-67S/67D
Intercom Mounting Bracket 1 1
Headset Jack Box and Cover
with Pre-mounted Headset Jack 4 6
with Pre-mounted Headset Jack
& Splash Cover 1 1
PTT Switch Pre mounted
in PTT Box and Cover 3 3
Headset Hooks 4 6
Jack Box Cover Screws 16 20
Jack Box and Bracket Mounting Screws 28 36
Wire Grommets 8 10
Jack Insulator Washer, Flat 5 7
Jack Insulator Washer, Shoulder 5 7
4 ft. Headset Jack and PTT Switch Cable 1 1
4 ft. Radio 1 Interface Cable 1 1
4 conductor hook-up wire (Roll) 1 1
4 ft. Radio 2 Interface Cable 1* 1*
* Supplied with US-45D and US-67D (dual radio) units only.
Installation Overview:
Sigtronics has simplified the installation process, to assure
perfect operation. Refer to the UltraSound Wiring Diagram
(for US-45S or US-67S see Figure 4 on page 5; for US-45D or
US-67D see Figure 5 on page 6). 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.
VOLUME — Intercom Volume — Adjusts intercom volume
level. Does not affect radio volume.
SQUELCH — Intercom Squelch — Adjusts VOX operation of
the intercom for variations in background noise levels.
RADIO 1/RADIO 2 (TALK) — Transmit Select (US-45D and
US-67D units only) — Used to select which radio to talk on
— Radio 1 or Radio 2.
AUTO/BOTH (LISTEN) — Receive Select (US-45D and US67D units only) — Used to select which radio is heard. In
“BOTH” position, you hear both Radio 1 and the Radio 2. In
“AUTO” position, only the radio selected by the RADIO
1/RADIO 2 switch is heard.
RADIO MIC TRANSMIT GAIN — Located on the back of the
unit — Sets the transmit mic audio level for the radio(s).
RADIO VOLUME — Located on the back of the unit — Sets the
range of receive audio from the radio(s).
Installation of the Sigtronics UltraSound System is a four step
process:
I. Mount the intercom unit.
(INTERCOM CHASSIS INSTALLATION)
II. Install the headset jacks and PTT switches.
(HEADSET JACK AND PTT SWITCH INSTALLATION)
III. Wire the jacks and PTT switches.
(HEADSET JACK AND PTT SWITCH WIRING)
IV. Wire the radio(s). (RADIO HOOK UP)
I. INTERCOM CHASSIS INSTALLATION
Intercom Placement:
There are a few factors to consider when selecting a mounting location for the UltraSound Intercom chassis:
1. The unit should be placed in such a way that the controls
on the front of the unit can be easily seen and operated.
Most commonly, this will be near the vehicle’s communication radio controls.
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2. The Intercom unit is primarily designed to be dash
mounted. It can be mounted on top of the dash or hang
below the dash or vehicle ceiling. The mounting bracket
is adjustable to allow for various mounting angles.
3. The location selected requires a minimum area of 2-5/16”
high by 7-7/8” wide by 4” deep. Verify that the intercom unit
and cables will not interfere with the normal operation of
any vehicle controls or the operation of vehicle compartment doors.
FIGURE 1
UltraSound
SQUELCH
INTERCOM
SEE TEXT
Mounting Intercom Unit: See Figure 1
1. Once the location is selected, remove the mounting
bracket from the intercom unit by unscrewing the two
large knobs. Be careful not to lose any of the four ratchet
washers.
2. Set the mounting bracket in the selected area and mount
with four 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.
VOLUME
2. 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.
3. 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.
4. Verify that the jack placement and headset cable do not
interfere with the normal operation of vehicle doors or
compartments.
5. In vehicles with intercom headset positions installed in
open jump seat locations, the combination of wind, road,
and engine noise, picked up by these jump seat headsets,
can in some cases produce excessive background noise
in the intercom system. Additionally, wide variations in
engine noise (from idle to high RPM) can falsely trigger
the intercom VOX (voice activated) feature. This is especially true for older vehicles with open jump seats located
next to the vehicle engine. There are two solutions for this
situation. The first one is the recommended one:
a) Order an additional Push-To-Talk (PTT ) switch (and
mounting box if needed) for each open jump seat
position. These switches can be conveniently mounted
at each jump seat location and wired so that the jump
seat headset microphone is disabled until the switch is
pressed. See Figure 2 below. The user then presses his
PTT button to talk on the intercom. PTT buttons wired
in this way only activate the intercom. They do not let
the jump seat locations talk on the vehicle radio(s).
FIGURE 2
TAN
INTERCOM PTT SWITCH
OPEN JUMP SEAT WIRING DIAGRAM
TIPRING
BARREL
HEADSET JACK
BLUE
BLACK
3. Place the intercom back into the bracket and replace
the four washers and two knobs. Set the Intercom to the
desired angle before tightening down the knobs.
II. HEADSET JACK AND PTT SWITCH INSTALLATION
Headset Jack Placement:
It is assumed that it has already been determined which
positions on the vehicle will have headsets. At this stage, it is
helpful to have a headset handy to physically gauge the best
place for a particular jack. There are several things to consider
when selecting a place to mount the headset jacks:
1. In general, for headset positions inside the vehicle, the
jacks should be placed towards the middle between the
user’s positions. They 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.
b) Order Sigtronics headsets (Models SE-8P, SE-48P, or SE-
18P) with the intercom PTT switch already mounted on
the ear cup for the open jump seat positions. The user
then presses the PTT button on his headset ear cup to
talk on the intercom. The advantage of this method is
that it eliminates having to mount and wire in additional PTT buttons for the jump seats. Note, however,
most departments prefer to have all the headsets on the
vehicle(s) the same so that any headset can be used in
any position. The headsets with intercom PTT switches
on them cannot easily be used in a position that has
radio transmit capability such as the Driver or Officer
position.
Sigtronics provides two ways to mount the headset jacks for
the UltraSound unit:
1. Mount the jacks in the supplied blue jack boxes.
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Advantages:
a) Little or no “behind the panel” space required.
b) No vehicle panel thickness limitation.
c) No large holes are required to be drilled - a real advan-
tage on vehicles with thick metal panels.
d) Complete electrical isolation of the jacks from the vehi-
cles chassis, because the jack box is fabricated out of
non conductive high impact plastic.
2. Mount the jacks directly on the vehicle with a “through the
panel” mounting scheme. Advantages:
SHOULDER
INSULATING
WASHER
TIP
BARREL
RING
HEADSET JACK
FLAT
INSULATING
WASHER
VEHICLE
PANEL
FLAT
FIGURE 3
METAL
WASHER
NUT – OR – SPLASH COVER AND NUT
a) Smaller space requirement. (Only slightly larger than the
jack itself).
b) Only one hole to drill per jack (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 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 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 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” 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 maximum 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
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