Sigtronics US-12D - Manual (Page 2)

Headphone Output: The UltraSound system is designed to
easily drive twelve 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 design to accommodate virtu-
ally 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 com-
munications.
Standardized for use with Sigtronics single plug headsets
(i.e. SE-8, SE-48, SE-18).
Model Differences: The US-12S is used in applications requir-
ing up to twelve persons at one time on intercom. Four of the
twelve have radio transmit capability. The US-12S is designed
for use with a single vehicle radio. The US-12D is identical
to the US-12S but can accommodate two separate vehicle
radios.
CONTROL FUNCTIONS
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-12D units
only) — Used to select which radio to talk on — Radio 1 or
Radio 2.
AUTO/BOTH (LISTEN) — Receive Select (US-12D units only)
— Used to select which radio is heard. In “BOTH” position,
you hear both Radio 1 and the Radio 2. In “AUTO” posi-
tion, 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 — L ocated on the back of th e unit — Sets the
range of receive audio from the radio(s).
ULTRASOUND INSTALLATION
Installation Overview:
Sigtronics has simplified the installation process, to assure
perfect operation. Refer to the UltraSound Wiring Diagram
(for US-12S see Figure 4 on page 5; for US-12D 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.
Standard Equipment Included
Besides the Intercom unit, each UltraSound system comes
complete with the following:
US-12S US-12D
Intercom Mounting Bracket 1 1
Headset Jack Box and Cover
with Pre-mounted Headset Jack
4 4
with Pre-mounted Headset Jack
& Splash Cover
1 1
PTT Switch Pre mounted
in PTT Box and Cover
3 3
Headset Hooks 4 4
Jack Box Cover Screws 16 16
Jack Box and Bracket Mounting Screws 28 28
Wire Grommets 8 8
Jack Insulator Washer, Flat 5 5
Jack Insulator Washer, Shoulder 5 5
4 ft. Headset Jack & PTT Cable 12 Pin 1 1
4 ft. Headset Jack & PTT Cable 9 Pin 1 1
4 ft. Radio 1 Interface Cable 1 1
4 ft. Radio 2 Interface Cable N/A 1
6 conductor hook-up wire (Roll) 1 1
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 mount-
ing 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 communi-
cation radio controls.
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 compart-
ment doors.
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
2