SDX-GDA Backpack HD Video Transmission System

Overview

The SDX-GDA Backpack HD Wireless Video Transmission System is a broadcast-grade, low-latency solution designed for military, police, and broadcast television field production. Built around advanced COFDM modulation and H.264 compression, it delivers full HD 1080P video -- resolution 1920x1080, compatible with 1080I, 720P, and 480P -- under challenging non-line-of-sight (NLOS) conditions. The system integrates directly into a backpack frame for comfortable one-person operation, earning its reputation as a "zero-latency" solution with an end-to-end delay of just 60 milliseconds.

Whatever the terrain -- urban canyons, dense forests, or maritime environments -- the SDX-GDA captures and relays high-quality imagery even during high-speed motion, overcoming the multipath reflections and obstructions that plague analog and conventional digital modulation schemes.

Key Features

• Full HD 1080P quality with H.264 efficient compression, supporting 24, 50, and 60 fps frame rates
• Dual video input via digital SDI and HDMI interfaces, with SDI loop-through output for local monitoring
• Adjustable transmit power from 1W to 5W, configurable on the integrated LCD panel
• Narrowband COFDM operation with channel bandwidth selectable from 1 to 8 MHz in 1 MHz steps
• 256-bit dynamic AES encryption for secure transmission
• SONY V-mount battery interface for direct use with professional broadcast batteries plus standard 5.5mm DC input (12-16V)
• Onboard TF card recording for local backup capture at the transmitter
• Receiver with signal strength indicator displayed as a percentage on the LCD panel
• Space diversity reception on the receiver side using dual antennas for robust signal recovery
• Compact form factor at 204x125x55mm and 1.5kg, fitting any standard backpack frame

Technical Highlights

COFDM (Coded Orthogonal Frequency Division Multiplexing) is the cornerstone of the SDX-GDA's performance. By splitting the data stream across hundreds of closely spaced orthogonal subcarriers, it effectively combats both frequency-selective fading and narrowband interference. In a single-carrier system, one deep fade or interferer can drop the entire link; in a COFDM system, only a small fraction of subcarriers are affected, and forward error correction (with code rates from 1/2 to 7/8) recovers the lost data. The receiver's space diversity combiner further improves link margin by selecting or combining the better of two spatially separated antenna paths.

Applications

The SDX-GDA is purpose-built for broadcast television field reporting, professional live event production, and tactical security operations. Typical deployment follows a soldier-to-vehicle-to-command-center chain: the backpack operator transmits to a nearby vehicle (typical range 1 km NLOS), which relays via long-range HD equipment to a command post or studio up to 40 km away. It serves public security, fire rescue, traffic management, civil defense, maritime patrol, customs enforcement, and oilfield security operations across urban, coastal, and mountainous environments.

Why Choose This System

The SDX-GDA combines broadcast-grade video quality with the freedom of untethered operation. Its backpack form factor, professional battery compatibility, and dual-input design mean your camera crew can move freely through environments where cable runs are impractical. With proven COFDM robustness, field-adjustable power and bandwidth, and military-grade encryption, it delivers the reliable HD link that broadcasters and tactical operators depend on when every frame matters.