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Headphone Output:
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 ST-8, or ST-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 communi-
cations.
Standardized for use with Sigtronics single plug headsets (ie. ST-8,
ST-48, ST-18).
Model Differences:
The UT-4S is used in applications requiring up to four persons at
one time on intercom. Two of the four have radio transmit capabil-
ity. The UT-4S is designed for use with a single vehicle radio. The
UT-4D is identical to the UT-4S but can accommodate two separate
vehicle radios.
The UT-6S 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 UT-6D is just like the UT-6S, but with dual radio
capability.
CONTROL FUNCTIONS
VOLUME — Intercom Volume: Adjusts intercom volume level. Does
not affect radio volume.
SQUELCH — Intercom Squelch: Adjusts VOX operation of the inter-
com for variations in background noise levels.
RADIO 1/RADIO 2 (TALK) — Transmit Select (UT-4D and UT-6D
units only): Used to select which radio to talk on – Radio 1 or Radio 2.
AUTO/BOTH (LISTEN) — Receive Select (UT-4D and UT-6D 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).
ULTRASOUND INSTALLATION
Standard Equipment Included
Besides the Intercom unit, each UltraSound system comes complete
with the following:
UT-4S/4D UT-6S/6D
Intercom Mounting Bracket .............................. 1 ..................... 1
Headset Jack Box and Cover
with Pre-mounted Headset Jack ..................... 4 ..................... 6
with Pre-mounted Headset Jack
and 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 UT-4D and UT-6D (dual radio) units only.
Installation Overview:
Sigtronics has simplified the installation process, to assure perfect
operation. Refer to the UltraSound Wiring Diagram. For UT-4S or
UT-6S see Figure 4; for UT-4D or UT-6D see Figure 5. 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.
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.
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.
