Product Specification Sheet APS189

Rev. 10/2017

TTU-1 Basic 2-Way Talk-Thru Electronic Communications System

The Basic Voice Communication System for

High-Security and Isolation Booth Situations

Today's security and isolation booths and ticket booths are often the best step you can take to protect your employees. But do they protect and also help maintain your very important good will? Not if clerks and customers have to shout and growl and repeat themselves to be heard or understood.

The Alpha Communications┬«/Norcon patented TTU-1 Talk-Thru Communicator is a 2-way, hands-free audio system that provides high-quality personal communication between people separated by security or isolation barriers. It is the most widely used system of its type in the U.S., and the world.

How It Works...

The Alpha Communications┬«/Norcon TTU system permits hands-free, 2-way communication between the booth attendant and the customer. Vox circuitry facilitates ongoing, clear, 2-way conversation at all times - as if the two parties were together in the same room.

The TTU-1 Talk Thru Communicator now incorporates circuity to automatically attenuate the outside channel. If the gooseneck microphone is not used for a period of 30 seconds, the outside channel will be reduced approximately 70%. Normal operation is restored as soon as the attendant speaks into the gooseneck microphone. The automatic volume attenuation circuit prevents outside noise from bothering the attendant.

The TTU-1 provides clear communication even in environments with high ambient noise by shaping the sound for maximum intelligibility. Its compression circuitry decreases loud, annoying sounds.

How To Install...

Installation of the TTU-1 is a very simple, one-person operation. All that's needed is a 3 to 4 inch round cutout in the barrier. Four fasteners and two rubber gaskets needed for mounting are supplied. Please specify barrier thickness when ordering.

The front face and housing are easily mounted on opposite sides of the barrier using the fasteners supplied. The rubber gaskets prevent slippage and protect the barrier surface. The electronic section is then inserted into the housing and fastened in place. 

Note choice of continuous-duty, 117-Volt AC power supply stepped down to 12 Volts (TTU-1A-X series), or rechargeable nickel cadmium battery operation (TTU-1D-X series).

  • Clear, 2-way hands-free voice communication.
  • Avoids shouting, repetition, misunderstanding.
  • Rugged, tamper-resistant materials.
  • Quality electronic design and engineering
  • Simple, one-person installation.
  • Self-powered with rechargeable battery option.
  • Fast plug-in recharge.
  • Bullet-resistant option.*
  • Export models available.
  • Units available for ADA applications.
  • Made in U.S.A.
Mechanical Specifications
Outside Face Plate:
Solid aluminum, anodized finish, tamperresistant
Control Housing (Inside):
Machined aluminum, anodized finish, tamper-resistant
Dimensions: Outside face plate - 5.00" dia x 0.50"D Inside control housing - 5.00" diameter x 3.50"D Microphone and gooseneck 18 in.
4.50 lbs. (model# TTU-1A-X)
Mounting: Partition hole 3 to 4 in. dia. (3.50" recommended) Please specify barrier thickness when ordering
Panel Controls:
Listen volume, talk, volume, on-off switch, charger socket (on battery unit)
Electrical Specifications (Booth Unit)

Audio Frequency Response:  Selectively shaped for maximum voice intelligibility
Audio Power:
2 watts per amplifier
Less than 2%
Listen Mode:
20 dB compression
Talk Mode:
Electret (inside gooseneck mic. is 18.0" long). Optional 8.0" or 24.0" models avail., at extra cost. Please specify when ordering!
Power Supply:
Input: 120 VAC, 60 Hz, Output: 15 VDC, 175mA
Useful time (on battery unit):
10 to 12 hours per charge
Charge time (battery unit):
5 hours for full charge. Unit can be used while charging  
8 Available Models
  • TTU-1A-X Complete for continuous-duty operation. 117 VAC power supply stepped down to 12 Volts
  • TTU-1AB-X Same as TTU-1A-X but with bullet-resistant option*
  • TTU-1AC Same as TTU-1A-X but without gooseneck microphone. Headset sold separately
  • TTU-1AC-X Same as TTU-1A-X but without gooseneck microphone. Headset and C99-X gooseneck microphone sold separately
  • TTU-1D-X Complete for 12VDC operation. Battery pack and built-in charger included.
  • TTU-1DB-X Same as TTU-1D-X but with bullet-resistant option*
  • TTU-1X-WR Same as TTU-1A-X, but wireless-ready (use with TTU-WHS-D headset)

Talk-Thru systems are shipped complete with mounting hardware, instructions, and power supply (AC operated unit), or charger (battery operated unit).

* Bullet-resistant shield rated up to Level 2. Higher level bullet resistant shields available (call for pricing and availability).
Alpha Communications
42 Central Drive • Farmingdale • NY • 11735-1202 • Phone: (631) 777-5500 • Fax: (631) 777-5599
TOLL-FREE: (800) 666-4800 • Web: • Email:
Copyright© 1998-2020 Alpha Communications® - All Rights Reserved.
Talk-Thru™ is a registered trademark of Norcon Communications Inc.
Due to continuous product improvement, all colors, sizes, materials, finishes and specifications are subject to change without notice.