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UltraSound UT Intercoms

  • Voice Activated - Turns on instantly when you start speaking and turns off when you stop. Eliminates noise pick-up through mic.
  • Systems for all tactical and emergency vehicles.
  • Available in 2 crew to 12 crew station models.
  • Models for single or dual radio systems.
  • All mounting hardware, jacks, switches and wire are included.
  • 1.8" Height x 6.1" Width x 4.5" Depth
  • Warranty: Two years parts and labor.
UT-4D Ultrasound Intercom

UT-4D Intercom

Simple Installation: The UltraSound is small and light weight and mounts above or below the panel and adjusts for easy viewing. The intercom package comes with all the necessary mounting hardware for installation in the vehicle. Small rugged mounting boxes, (1-5/16" x 2" x 2") are provided with every unit to accommodate headset jacks and push-to-talk switches. Complete and easy to follow instructions are provided along with helpful hints, operating instructions, and an 800 number for technical help.

Versatility: Systems are available for all tactical and emergency vehicles with up 12 crew stations. Sigtronics can also customize systems to fit your special requirements.

Radio Operation: Models UT-4S, UT-6S and UT-12S are for single radio operation. Models UT-4D, UT-6D and UT-12D are configured for dual radio operation. They have additional switches that allow you to select which radio to transmit and receive on.

Fail Safe: The mobile radio, hand microphone and speaker will function normally with the intercom installed. The transmit keying circuit is fully isolated to provide for all radio keying configurations.

Stations: The UT-4S and UT-4D intercoms will accept up to four headsets. Two positions will have radio transmit capability. The UT-6S and UT-6D will accept up to six headsets. Three positions will have radio transmit capability. The UT-12S and UT-12D will accept up to twelve headsets. Four positions have radio transmit capability.

For a intercom system quote, click on this Quote Form link.


  • Turn on instantly when you start speaking and turn off when you stop, which eliminates constant noise pick-up through the headset microphone.
  • Interfaces to single or dual mobile radios, allowing all communications, both transmit and receive, to be heard through each headset.
  • Compatible with cellular telephones. Contact us for information on using a Bluetooth cell phone with a Sigtronics intercom system.
  • Radio transmit is accomplished by way of the headset microphone through use of a push-to-talk switch. This design allows placement of the push-to-talk switch in the most accessible location and eliminates the need to reach for the hand microphone.
  • As an added safety feature, the intercom function is automatically disabled while transmitting so that only the voice of the person transmitting goes over the air, however his voice is heard by all crew members.
Ultrasound Accessories

Model Number Positions Radio Transmit Positions Radio
UT-4S Up to 4 Headsets 2 Single Radio System
UT-4D Up to 4 Headsets 2 Dual Radio System
UT-6S Up to 6 Headsets 3 Single Radio System
UT-6D Up to 6 Headsets 3 Dual Radio System
UT-12S* Up to 12 Headsets 4 Single Radio System
UT-12D* Up to 12 Headsets 4 Dual Radio System

* UT-12 intercoms include the same mounting hardware, jacks, and switches as the UT-4 intercoms.

PDF Instructions  
Installation and
Installation and Operating Instructions
Models: UT-4S, UT-6S, UT-4D, and UT-6D
Installation and Operating Instructions
Models: UT-12S and UT-12D
User Operating Instructions
For all UltraSound Intercoms
12 Way Intercom Pin-out Instructions
Models: UT-12S
12 Way Intercom Pin-out Instructions
Sigtronics Special 4 Conductor Jack Wiring Instructions
To install Sigtronics headsets with Radio-Push-To-Transmit buttons. Use instructions to wire these jacks into a Sigtronics UltraSound intercom system.