More Details Technical Overview

Interior Layout – Dual-Operator Stations with Defined Roles

The CARC Communication Trailer features two fully equipped operator stations, each designed to support both a RADO (Radio Operator) and a DATO (Data Operator). This dual-role setup allows the trailer to function efficiently in both emergency communications and public engagement scenarios by splitting the workload for that station among two operators.

Operator Roles:

The CARC Communication Trailer supports two clearly defined operator roles that work in coordination to share the communication workload during any deployment:

• RADO (Radio Operator) – Responsible for all radio voice communications and control of radio systems, including radio operation, frequency management, and radio mode management
  
  

• DATO (Data Operator) – Manages digital messaging systems such as Winlink, FLDigi, SARTrack, JS8Call, MeshChat, mapping, logging, and ICS form handling
  
  

Together, the RADO and DATO function as a team, splitting tasks based on mission needs and ensuring that both voice and data communication are handled seamlessly.

Station Roles:

While both stations are capable of handling full radio and data operations, each station has a primary focus based on its equipment integration and placement in the trailer.  

🔹 Station 1 

Primary Role: Event Support and emergency communication hub
Operators: 1 RADO + 1 DATO

Key Equipment:

• Access to Primary HF/VHF/UHF Radio (Yaesu FT-991A)
  
  

• Access to Secondary VHF/UHF Radio (Anytone 578)
  
  

🔹 Station 2

Primary Role: Outreach and Demonstration
Operators: 1 RADO + 1 DATO

Key Equipment:

• Access to Primary HF/VHF/UHF Radio (Yaesu FT-991A)
  
  

• Access to external TV and speaker system for live demonstration
  
  

In summary, the CARC Communication Trailer’s interior is built around two versatile, dual-operator stations—each supporting both a RADO and a DATO working side by side. This setup enables simultaneous voice and digital communications while splitting the workload for greater efficiency. Whether operating in emergency situations, supporting community events, or conducting live demonstrations, the trailer's layout ensures each team has access to the tools and equipment needed for seamless coordination and effective operation.

INTERNAL SYSTEMS

Primary Radio – Yaesu FT-991A (VHF/UHF + HF)

Equipment:

The trailer includes a Yaesu FT-991A as its primary radio, offering full coverage of HF, VHF, and UHF amateur bands in a single, compact all-mode transceiver.
It supports FM, SSB, AM, CW, and digital modes through a soundcard interface.

Uses:

• Local voice communications on 2m and 70cm for nets, events, and emergency coordination
  
  

• Long-range HF communications on 160m–10m bands, enabling regional, nationwide, and worldwide contacts
  
  

• Digital modes such as FT8, JS8Call, FLDigi, and Winlink when connected to a computer
  
  

• Simplex and repeater operation for voice traffic and analog net control
  
  

• Flexible station role — can serve either VHF/UHF or HF needs depending on mission requirements
  
  

How It Helps:

• Global Reach: HF capability allows the trailer to make direct radio contact across the country—or across the world—without relying on internet infrastructure.
  
  

• Multi-Band Efficiency: Combines short-range and long-distance communication in one device, ideal for dynamic deployments and limited space.
  
  

• Emergency Flexibility: HF bands can provide communication out of the affected area during disasters, supporting health-and-welfare messages or regional coordination.
  
  

• Digital Integration: Supports robust digital messaging and email (via Winlink), even under weak signal conditions when connected to a computer.

Secondary VHF/UHF Radio – Anytone AT-D578UVIII Pro

Equipment:

The trailer includes an Anytone AT-D578UVIII Pro as its secondary VHF/UHF radio.
This is a dual-band transceiver that supports both analog FM and DMR (Digital Mobile Radio). It also features built-in GPS and APRS (Automatic Packet Reporting System) capabilities.

Uses:

• Digital voice communication using DMR talkgroups with access to worldwide coverage
  
  

• Backup analog communication via simplex or repeater operation
  
  

• Cross-band repeat in both digital and analog modes, extending coverage between handhelds and other systems
  
  

• Position tracking with APRS during mobile deployments or public service events
  
  

• Educational demonstrations of digital radio modes during school visits and outreach
  
  

How It Helps:

• DMR Connectivity: Provides global voice communication through internet-linked talkgroups, allowing contact with amateur radio operators around the world.
  
  

• Redundancy & Flexibility: Acts as an additional voice channel, ensuring smooth communication when the primary radio is in use or unavailable.
  
  

• Extended Range via Cross-Band Repeat: Bridges handheld radios to distant stations, enhancing on-site communications during large-area events or field deployments.
  
  

• Situational Awareness: Real-time GPS and APRS data enhance coordination of mobile or field personnel.
  
  

• Modern Technology Showcase: Demonstrates advanced digital radio capabilities that resonate with tech-minded students, educators, and the public.

Scanner – Whistler TRX-2 Digital Base/Mobile Scanner

Equipment:

The trailer includes a Whistler TRX-2, a digital base/mobile scanner capable of receiving a wide range of public safety and commercial communication systems.
It supports both analog and digital systems including P25 Phase I & II, DMR, and NXDN.

Uses:

• Monitor local and regional public safety traffic, including law enforcement, fire, EMS, and emergency management
  
  

• Receive NOAA weather alerts
  
  

• Demonstrate radio scanning as part of community education and outreach
  
  

How It Helps:

• Enhanced Situational Awareness: Allows operators to monitor real-time activity across a variety of public service and commercial channels—regardless of radio system type.
  
  

• Interoperability Monitoring: Provides insight into operations of public service and commercial agencies, helping with coordination and safety planning.
  
  

• Training & Public Engagement: Offers an easy-to-understand way to introduce scanning, frequency use, and digital communication technologies during public demonstrations or school visits.

Mesh Networking – AREDN Nodes (Amateur Radio Emergency Data Network)

Equipment:

The trailer is equipped with one or more AREDN (Amateur Radio Emergency Data Network) nodes. These are specialized mesh network devices using re-flashed commercial-grade Wi-Fi hardware (such as Ubiquiti or Microtik) to operate on amateur radio frequencies.
Mounted on a mast or tripod, the node forms part of a self-healing, decentralized mesh network that can pass digital data without the need for internet access.

Uses:

• Establish a private, high-speed wireless data link between the trailer and other AREDN nodes (e.g., EOCs, towers, other trailers)
  
  

• Support IP-based tools like VoIP phones, security cameras, weather sensors, and file servers
  
  

• Create a local intranet for use in field deployments and emergency operations
  
  

• Demonstrate off-grid digital networking during educational or public events
  
  

How It Helps:

• Reliable Data Sharing: Enables transfer of real-time video, emails, documents, and VoIP traffic even if the internet is unavailable.
  
  

• Tactical Flexibility: Nodes automatically form and reroute connections, ensuring continuous service even if one or more links become inoperable.
  
  

• Interagency Connectivity: Allows coordination with other amateur radio operators or served agencies using compatible nodes across the area.
  
  

• Public Demonstrations: Offers a clear example of how amateur radio goes beyond voice, showcasing modern networking technology in a public safety context.
  
  

• Expandable System: Easily scales as new nodes are added—whether in fixed positions (like EOCs) or mobile platforms (other trailers, vehicles).

Computing Systems – Windows Desktop Workstations with Dual Displays

Equipment:

The trailer is equipped with Windows-based desktop computers, purpose-built for radio operations, digital communication, and administrative support.
Each system includes mirrored dual monitors, allowing both the radio operator and data/logging operator to view the same information simultaneously.
The computers are also equipped with GPS receivers, providing accurate location data for mapping, logging, and integration with digital communication tools.

Uses:

• Operate digital radio modes such as Winlink, FT8, JS8Call, FLDigi, and APRS
  
  

• Log contacts and activity with location-aware features
  
  

• Monitor and manage AREDN mesh nodes,VoIP phones, and internal file sharing
  
  

• Access GPS-enabled mapping and weather tools in real time
  
  

• Display synchronized data for both operators through mirrored screens during operations or training
  
  

How It Helps:

• Shared Situational Awareness: Dual displays keep radio and data operators aligned without having to share a screen or workspace.
  
  

• Enhanced Coordination: GPS integration allows for real-time mapping, APRS overlays, and accurate location tagging in reports and emails.
  
  

• Digital-Ready Platform: Windows OS ensures compatibility with the full suite of amateur radio software for voice, data, and coordination tasks.
  
  

• Operational Efficiency: Operators can work in tandem, reducing communication errors and improving responsiveness during events or emergencies.
  
  

• Public & Training Value: Displays can be mirrored for demonstrations, making technical processes easier to explain and visualize.

Audio System – Multi-Mixer Monitoring and External Broadcast

Equipment:

The trailer uses a modular audio system built around three dedicated mixers:

• Two station-level mixers — one at each operator position — allowing each operator to independently select and control audio from any radio (HF, VHF/UHF, DMR, or scanner)
  
  

• One external audio mixer — used to route selected audio sources to speakers mounted outside the trailer for public listening or event coordination
  
  

• Each mixer supports multiple audio inputs, with individual volume and channel selection controls
  
  

• Headphone and powered speaker options available at both operator positions
  
  

Uses:

• Let each operator monitor any radio (or multiple radios) independently, without needing to be physically located at the radio itself
  
  

• Synchronize monitoring when both operators need to hear the same traffic (e.g., during a net or emergency activation)
  
  

• Broadcast selected radio traffic outside the trailer for demonstration or educational purposes
  
  

• Enable flexible headset/speaker use depending on operational noise level or environment
  
  

• Quickly mute or prioritize channels based on mission needs or traffic importance
  
  

How It Helps:

• Independent Monitoring: Each operator has full control over what they hear, enabling customized setups during complex operations.
  
  

• Public-Facing Engagement: The external mixer allows clean audio output to outside speakers for public demonstration or event participants without disrupting trailer operations.
  
  

• No Operator Overlap: Eliminates the need to pass headsets or switch seats—each station is fully functional on its own.

Power System – Victron Multiplus II with 600Ah LiFePO₄ Battery Bank

Equipment:

The CARC Communication Trailer features a Victron Energy power system built for durability, reliability, and intelligent operation in both field and fixed deployments. The system’s core components include:

• Victron Multiplus II Inverter/Charger – Automatically charges batteries when connected to generator or shore power, and inverts battery power to 120V AC when shore power is unavailable or insufficient
  
  

• Victron Lynx Shunt – Tracks voltage, current, and state-of-charge with real-time Bluetooth monitoring via the VictronConnect app
  
  

• Victron Lynx Distributor – Centralized, fuse-protected DC busbar for clean and safe power distribution
  
  

• 600Ah Renogy LiFePO₄ Battery Bank – High-capacity, long-life lithium batteries support extended operations
  
  

• 30 Amp Shore Power Inlet – Accepts standard 120V RV-style service for grid or generator input
  
  

• Portable Generator Input – Provides primary or backup AC source in the field
  
  

Uses:

• Run all trailer systems, including radios, digital equipment, lighting, AREDN mesh, computers, and auxiliary gear
  
  

• Charge batteries via generator or 30A shore power, with intelligent regulation
  
  

• Automatically invert DC battery power to AC when external power is inadequate or disconnected
  
  

• Monitor system performance through Bluetooth-enabled Victron app
  
  

• Distribute clean, safe power to all connected systems with built-in protection and real-time monitoring
  
  

How It Helps:

• Dual-Function Inverter/Charger: The Victron Multiplus II provides automatic charging when external power is present and seamless inverter output when it’s not—ensuring no downtime during power transitions
  
  

• High-Endurance Battery Power: 600Ah of LiFePO₄ storage allows for extended off-grid operation—ideal for long events or field emergencies
  
  

• Independent Station Power: Each operator station is backed by 100A DC service, ensuring plenty of power for even high-demand configurations
  
  

• Quiet Operations: The trailer can operate in limited mode using battery power alone, ideal for low-noise environments or nighttime use
  
  

• Indefinite Runtime with Generator: When paired with a generator, the trailer can run continuously, maintaining full system function while charging batteries
  
  

• Professional Monitoring: Live voltage, current, and system alerts available from any phone or tablet via the VictronConnect app
  
  

• PowerAssist Functionality: The Victron Multiplus II can supplement a low-capacity AC input (like a standard 15-amp household outlet) with inverter power from the battery bank. This ensures the trailer can still meet 100% of its power needs even when plugged into a basic residential outlet.

Onboard Amenities – Comfort and Convenience for Operators

Equipment:

To support extended deployments and ensure operator readiness, the CARC Communication Trailer is equipped with a variety of amenities designed to improve comfort, reduce fatigue, and promote operational efficiency:

• Mini Refrigerator – Keeps drinks, snacks, or temperature-sensitive items cold
  
  

• Microwave Oven – For heating meals and beverages during long shifts
  
  

• Coffee Maker – Provides hot drinks to keep operators alert and energized
  
  

• Rapid USB Charging Ports – Conveniently located at operator stations for fast charging of phones, tablets, and handheld radios
  
  

• Air Conditioning Unit – Keeps the interior cool during hot summer events or deployments
  
  

• Heating System – Ensures operator comfort and safe equipment operation during winter or cold-weather activations
  
  

Uses:

• Support operators during long activations with basic food, drink, and climate control
  
  

• Provide creature comforts that improve focus and morale during public service events, training, and emergency response
  
  

How It Helps:

• Improves Operator Endurance: Well-fed, comfortable operators are more alert and responsive during extended field operations
  
  

• Enables Year-Round Use: With both heating and cooling, the trailer is fully deployable in any season
  
  

• Reduces Field Dependence: Amenities allow the trailer to function as a self-contained unit, minimizing reliance on external facilities or support during events

EXTERNAL SYSTEMS

External Display and Audio System

Equipment:

The CARC Communication Trailer features a large TV monitor and an outdoor speaker set, both mounted externally to enhance visibility and engagement during operations and public events.

• Outdoor TV Monitor – Mounted to the trailer’s exterior, capable of displaying live digital content such as maps or training materials
  
  

• Exterior Speaker Set – Connected to the internal audio system, capable of broadcasting audio from any one or multiple radios (HF, VHF/UHF, DMR, or scanner) as selected through the trailer’s audio mixer
  
  

Uses:

• Showcase live communications activity to the public during events, school visits, or demonstrations
  
  

• Broadcast selected radio traffic outside the trailer for volunteers, officials, or curious onlookers
  
  

• Provide visual aids during training sessions or emergency operations without crowding the interior workspace
  
  

• Support briefings or situational awareness for support teams outside the trailer
  
  

How It Helps:

• Engages the Public: Allows visitors to see and hear amateur radio in action, helping break down the mystery of what’s happening inside the trailer
  
  

• Reduces Disruption Inside: Keeps public observers and support personnel informed without entering the operating space
  
  

• Supports Education: Makes it easy to teach students, scouts, or community members by displaying real-time data and activity
  
  

• Field-Proven Functionality: Adds professionalism and communication clarity to the trailer’s public-facing role during emergencies and outreach events

Antenna Structures – Flagpole-Style Mounts for Rapid Deployment

Equipment:

The CARC Communication Trailer is equipped with three flagpole-style antenna mounts, permanently affixed to the trailer frame. These provide strong, stable platforms for deploying a variety of antenna types during operations or events.

• Three Heavy-Duty Flagpole Mounts – Bolted to the trailer, designed to hold sectional poles in 4’ increments
  
  

• Compatible with Multiple Antennas – Supports dual-band VHF/UHF verticals, HF wire antennas, and mesh networking nodes (AREDN)
  
  

• Non-Penetrating, Quick Deployment Design – Allows fast setup without guy wires, ideal for rapid response or temporary stations
  
  

Uses:

• Deploy VHF/UHF verticals for local analog or DMR communications
  
  

• Support HF wire antennas (dipoles, verticals, end-feds) with height advantage
  
  

• Mount mesh networking nodes for AREDN data links

How It Helps:

• Rapid Field Setup: Operators can deploy antennas in minutes
  
  

• Flexible and Modular: Multiple masts at varying heights with different antenna types can be swapped depending on the mission—whether HF voice, digital, or emergency data networking
  
  

• Stable and Durable: Mounts provide solid support without needing guy lines in many applications, reducing setup footprint
  
  

• Professional Appearance: Keeps cables and equipment organized, supporting a clean and functional layout for public demonstrations or formal deployments

External Connection Box – Coax, Network, GPS, and DC Power Pass-Through

Equipment:

The CARC Communication Trailer includes a custom external connection box designed to provide clean, organized access to critical components including coax, data, and power interfaces without compromising the trailer’s interior. This weather-resistant box serves as a central hub for field deployment and interoperability.

• 10 Coax Pass-Through Ports – Supports up to ten separate antenna or RF system connections (HF, VHF/UHF, APRS, scanner, etc.)
  
  

• 2 Ethernet Ports – One for WAN (Internet input), and one for LAN (AREDN DTD), enabling direct mesh node-to-node connectivity with external equipment
  
  

• 2 USB Ports – Assigned to each onboard computer’s GPS receiver for external antenna or receiver placement
  
  

• 30 Amp Anderson Powerpole Connector – Provides external 12V DC power, ideal for powering auxiliary devices located outside the trailer
  
  

Uses:

• Connect antennas quickly and cleanly without routing coax through doors
  
  

• Integrate external AREDN nodes into the trailer’s internal mesh via direct Device-to-Device (DTD) Ethernet connection
  
  

• Extend GPS modules to outside antennas for better satellite lock and accurate positioning
  
  

• Supply 12V DC power to auxiliary gear
  
  

• Enable WAN access for limited Internet connectivity (if available)
  
  

How It Helps:

• Field-Ready Expansion: Makes the trailer truly modular—connect new antennas, mesh nodes, or external gear with ease and speed
  
  

• Professional Cable Management: Keeps coax, Ethernet, and power runs clean, safe, and protected from environmental exposure
  
  

• Supports Advanced Networking: The dual Ethernet ports allow for seamless integration with other mesh nodes or local networks without compromising internal routing
  
  

• GPS Accuracy Boost: USB ports allow GPS units to use high-quality external antennas for improved signal in poor reception areas
  
  

• Flexible Power Integration: The 30A Anderson connection makes it easy to share power with other equipment in the field