Sigtronics UltraSound Emergency Intercom System
US-LAC4 and US-LAC6
INSTALLATION AND OPERATING INSTRUCTIONS
Specialists in “SOUND” Management
178 East Arrow Highway, San Dimas, CA 91773 (909) 305-9399
igtronics
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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.
Voice Activated Intercom (VOX) feature allows “hands free” com-
munication 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
US-LAC4 unit and up to six for the US-LAC6 units. 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
headset into his jack while driving. He then unplugs and plugs into
the pump panel when he arrives on scene.
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 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 communi-
cations.
Standardized for use with Sigtronics single plug headsets (ie. SE-8,
SE-48, SE-18).
Model Differences:
The US-LAC4 is used in applications requiring up to four persons
at one time on intercom. Two of the four have radio transmit capa-
bility. The US-LAC4 is designed to accommodate two separate
vehicle radios.
The US-LAC6 can intercom up to six people at one time with the
same dual radio capability. Three of the six can transmit on the
vehicle radio.
