ICRI™ Hardline In-Building and Subterranean Communications Repeater Alternative

The C-AT Signal Continuity Kit (CSCK) is a hardline communications solution that maintains radio coverage in buildings, tunnels, mines, caves, ship holds, and basements where RF signals fail. It gives first responders, military, and industrial teams continuous voice connectivity without relying on repeaters, boosters, or in building systems.

 

Built for Real World Environments

The CSCK extends ICRI connectivity through concrete, steel, and below grade environments where radios alone cannot penetrate. It is designed for stairwells, collapsed structures, maritime bulkheads, subterranean passages, and other RF compromised areas.

  

No Delays. No Configuration. No Power required. 

For Teams that can't afford to lose Comms

 

  • Mission-Proven Alternative to Radio Repeaters

    Provides a repeater like function without the cost, setup time, or dependency on infrastructure. Ideal for tactical in building and subterranean operations where coverage is denied.

 

  • Plug-and-Talk Simplicity

    No software. No amplifiers. No power. No learning curve. Just connect and your voice traffic is live in seconds.  

 

  • Hardline Link Through RF-Blocked Terrain

    Transmits voice traffic directly through concrete, steel, earth, and maritime bulkheads. Maintains a secure, real-time connection from entry point to command post.

 

  • Clear, Unbroken Audio Performance

    No dropouts. No distortion. Works seamlessly with HF, VHF, UHF, P25, LTE, and satellite radios. No reconfiguration needed.

 

Features That Matter in the Field

 

  • Scalable for Complex Structures
    Available in 250-foot or 500-foot lengths. Link multiple reels to extend up to 5,000 feet from a single ICRI port. Deploy from multiple ports in multiple directions to cover multi-level or long-range operations.

 

  • Rugged and Field-Ready
    Compact enough for narrow entries. Durable enough for repeated deployments in disaster, industrial or tactical environments.

 

  • Single-Operator Deployable
    Integrated assisted spool allows smooth, fast deployment and retrieval by a single responder even in unstable or high-risk areas.

 

  • Independent of Infrastructure
    No reliance on in-building systems, boosters or external power. Operates fully standalone for disaster response, industrial rescue, or military missions

 

OWN THE COMMS.

Extend Command and Connectivity Without Compromise

 

The C-AT Signal Continuity Kit (CSCK) delivers a cost effective, repeater like link for line of sight denied environments. Whether you are inside a high rise, navigating a mine, operating shipboard, or responding to a collapsed structure, the CSCK keeps your comms continuous, scalable, and aligned with the mission.

 

Optimized for:

  • Tactical in building communications

  • Subterranean and confined operations

  • Maritime and shipboard communications

  • Radio coverage in RF compromised areas

  • First responders, industrial rescue, and military teams

 

Frequently Asked Questions

 

What is the C-AT Signal Continuity Kit (CSCK)?
The CSCK is a hardline communications kit that extends radio traffic through cable to maintain comms in environments where RF signals cannot reach, such as tunnels, basements, mines, caves, and ship holds.

 

How does the CSCK differ from a repeater?
A repeater requires power, setup, and often building infrastructure. The CSCK needs none of these. It creates a direct hardline path for uninterrupted voice communications, making it ideal for disaster and off grid operations.

 

Who uses the CSCK?
It is trusted by first responders, military units, and industrial rescue teams who need reliable voice coverage in radio dead zones.

 

What radios are compatible with the CSCK?
The CSCK works with HF, VHF, UHF, MANET and P25, LTE, mobile phones, satellite phones, and more without any reconfiguration.

 

 

C-AT Signal Continuity Kit

Field Proven for Underground, Structural, and Utility Access
Deploy the cable into:

  • Vaults, manholes, basements, and sub basements

  • Tunnels and reinforced concrete zones

  • Elevator shafts and interior collapse areas

Connect. Communicate. Stay protected.
No power. No IT setup. No lost signal. The CSCK delivers continuous voice communications in tunnels, stairwells, vaults, ships, bunkers, and collapsed structures without relying on repeaters, BDAs, or building systems.

Beyond Line of Sight Signal Extension

Beyond Line of Sight Signal Extension
More than a hardline, it is a field proven signal extension system.
Deploy the reel to create an extended comms link by:

  • Raising a connected radio up a fire truck ladder

  • Running cable to a ridgeline or embankment

  • Mounting on tethered drones or tripods

  • Dropping into a remote trench, culvert, or cleft

Reliable Reach Without Infrastructure
C-AT’s system delivers instant, power independent RF coverage with no licensed repeaters, no batteries, and no field programming required.

Caves, Mines, Ships and Tunnels

In high risk environments such as mines, ships, tunnels, caves, and collapsed structures, radio signals often fail. The C-AT Signal Continuity Kit (CSCK) extends ICRI connectivity into RF denied zones, providing a reliable voice path when responders move beyond the reach of traditional radios.

Whether navigating a smuggling tunnel, coordinating a mine rescue, or clearing a ship below deck, this solution keeps teams connected from the entry point to the farthest reach of the mission area.

 

Simple to deploy. Easy to carry. Proven in operations where timing and coordination decide the outcome.

 

Mission Critical Coverage
Keeps communications flowing in:

  • Cave and tunnel rescue operations

  • Mine inspections and collapse response

  • Maritime interdiction and shipboard operations

  • Border security and underground interdictions

  • Subterranean infrastructure or subway emergencies

WHY CHOOSE THE CONFINED SPACE COMMUNICATIONS KIT (CSCK)?

When teams go below grade or inside reinforced structures, radio signal problems are guaranteed - but the right solution isn’t always obvious.

Some tools rely on power, environmental conditions, or software to do their job.
The Cable Reel doesn’t.

This is a physical link you control.
It doesn’t guess. It doesn’t buffer. It doesn’t wait to “lock on.”
It works the moment you connect it, and keeps working until the job is done.

Agencies trust the CSCK because it removes the uncertainty from unpredictable environments:

 

  • Concrete, steel, terrain, and depth
  • No line-of-sight
  • No signal bleed
  • No moving parts or startup sequences

 

It’s a solution designed by field operators, not IT teams or theorists.

There’s no guesswork. No lag. No “we thought it would work here.”
Just communication that holds, even when the structure or situation doesn’t.

If you had to make comms work right now - no power, no delay - this is what you'd use.

That’s why agencies carry the CSCK. It's a solution oriented system that doesn't leave the outcome to chance.

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ICRI™ ADD-ONS

Pelican Case
Pelican Case for Storage
cable reel
C-AT Signal Continuity Kit (CSCK)
Noise-filtering Board
Proprietary HF Noise-Filtering Board
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ICRI™ Link-Port Option
VoIP Integration
VoIP Integration
DTMF Keypad Integration
DTMF Keypad Integration
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DIN/Neutrik to Environmental/U229 Adapter
sSatLink ICRI for Starlink – In Production
sSatLink ICRI for Starlink
No matter which ICRI™ model you choose, we’ve got a range of enhancements and accessories to tailor your solution even further:
Portable Speaker
Connections:

Available with Bluetooth or hardwired speaker connections, the ICRI™ supports one speaker connection per talk group for flexible, clear communication.

ICRI™ to ICRI™
Link Port:

Expand your capacity by connecting ICRI's together for multiagency response.

Lightweight Headsets

For Hands Free Communication, the Incident commander can opt to wear a headset

Pelican Cases:

Protect your ICRI™ with rugged cases, available with or without foam-fitted inserts, for secure storage and transport.

DTMF Capability:

DTMF (Dual-Tone Multi-Frequency) sends commands via tone signals, working even without mobile networks. The ICRI™ uses DTMF to remotely activate channels or systems, ensuring reliable communication in critical operations.

C-AT Signal Continuity Kit:

Our reel assist, plenum rated, non-sparking cable is engineered to keep teams connected in RF challenged environments including ships, basements, tunnels, caves, and other below grade or reinforced structures.

ICRI TESTIMONIALS

“During a mountain rescue in the Rockies, our team relied on the Compact ICRI for clear communication across steep terrain. The unit acted as a repeater in the mountains. The rugged design held up flawlessly, and the ease of use meant we could focus on the rescue mission without worrying about our gear.”

— Chris L., Search and Rescue Team Leader

ICRI TESTIMONIALS

“During a large-scale disaster response exercise, our command center used the Base ICRl to keep communication uninterrupted between our field teams and headquarters. The setup was easy, and the connection remained steady and reliable, even as we ran through multiple incidents at once. Highly recommend for integrating systems.”

— Nancy M., Emergency Response Coordinator

ICRI TESTIMONIALS

“During a high-priority search operation for a fugitive, The ICRI proved essential, delivering consistent and dependable communication between air, ground, state, and local police forces. It allowed us to coordinate efforts across all teams, despite the radios ensuring the operation was successful.”

— Jennifer K., Homeland Security

ICRI TESTIMONIALS

“During a recent fire response, our department fought intense conditions, including heavy use of water from our trucks to control the blaze. The Guardian ICRI worked well, despite being exposed to high-pressure water and rough handling, the Pelican case kept our communication equipment completely protected. Our radios stayed fully operational, allowing us to coordinate without interruptions. This level of durability and reliability is exactly what we need in the field.”

— Lt. Mark L., Fire Department Operations

ICRI TESTIMONIALS

“During a school emergency drill, the Operator Pro Base Model was invaluable. It connected our administration directly with local emergency services, police, ambulance and even the parental safety zone. It helped us with clear communication and quick coordination. The setup was straightforward, and the unit's reliability gave us peace of mind.”

— John P., School Safety Coordinator

ICRI TESTIMONIALS

“During a catastrophic bridge collapse, the Commander Elite ICRI was crucial in our coordinated response. It connected multiple agencies including the National Guard, DHS, and search and rescue teams, along with air and ground support, allowing us to manage rescue operations swiftly and effectively. The ability to maintain clear communication across all teams was essential in handling such a complex and urgent situation.”

— John D., Emergency Response Director

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