ARC-9 Covert Audio Relay Unit
ARC-9
ARC-9 Covert Audio Relay Unit
Device Designation: ARC-9
Manufacturer: LangSec Dynamics
Catalog Reference: Equipment Catalog, Item No. ARC-9-502
Device Overview
The ARC-9 is a tactical-grade, field-deployable audio surveillance unit built for low-profile monitoring in denied or hostile environments. Designed to resemble discarded military infrastructure, it passively captures low and ultrasonic frequencies and transmits over secure mesh or standalone protocols. As the larger sibling of LangSec’s micro-surveillance line, the ARC-9 offers superior range, environmental resilience, and audio intelligence without giving away its position.
Acoustic Capabilities
- Frequency Capture: 10 Hz to 128 kHz
- Microphone Array:
– High-sensitivity omnidirectional capsule grid
– Electromagnetic beamforming for real-time directionality shift
– No mechanical parts—digitally steered targeting zones
- Noise Management:
– Dynamic wind suppression
– Rain and storm filter modes
– Multi-band adaptive noise canceling
– Voice Isolation AI: targets vocal tones, filters environmental clutter
- Audio Relay Modes:
– Real-time continuous feed
– Delayed burst packets
– Silent buffer with burst sync trigger
Transmission & Network
- Modes:
– Standalone (direct sync)
– Mesh-linked (integrates seamlessly with FR 72 field repeaters)
- RF Control:
– Low duty cycle burst emission
– Passive receive-only mode
– Tamper-detection auto-jam signal
- Radio Frequency:
– UHF band 402–428 MHz
– Operates within FR 72’s supported range of 400–512 MHz
– Supports spread spectrum frequency hopping for stealth and anti-jamming resilience
- Encryption:
– AES-256 encrypted packets
– 4096-bit RSA key exchange
– Temporary session key cycling every 12 minutes
– Auto-scrub protocol activates on hardware breach
Physical Specifications
- Dimensions: 100mm x 58mm x 22mm
- Weight: 150 grams (5.3 ounces)
- Material: Rugged matte polymer alloy with impact dispersion and heat shielding
- Ingress Rating: IP68 (submersible, dustproof, and drop-resistant)
• Operating Temp Range: –25°C to 50°C
Power & Runtime
- Battery Type: LiFePO₄ rechargeable, field-replaceable
- Runtime:
– Passive Listening: up to 6 days
– Relay Mode (burst): 48–72 hours depending on duty cycle
– Local Recording Only: 48 hours continuous
- Charging Options:
– Magnetic dock
– USB-C with weather-sealed port
– 4-pin proprietary connector (compatible with LEX-series adapter LEX-4-ADP)
- Power Management:
– Auto sleep-wake logic
– Configurable wake triggers
– Battery health monitoring
Deployment & Field Use
- Visual stealth design mimics obsolete field boxes or structural mounting points
- Fully autonomous—no buttons, lights, or manual activation required
- Deploys via strap, magnet, or embedded adhesive brackets
- Used successfully in The Last Echo mission to intercept hostile comms near tripwire
- Can integrate with remote mic arrays or operate solo with full relay capability
Deployment History
- The Last Echo
- The Shepherd’s Code
- The Bone Road