Breaking the 30-Minute Limit: How Tethered UAVs Enabled 24-Hour Continuous Live Broadcasting Since MWC 2017

 In the frenetic atmosphere of the World Mobile Congress (WMC) in Shanghai on June 28, 2017, amidst the roar of FPV racing drones tearing through the exhibition hall, a silent technological revolution was unfolding in a quiet corner. An unassuming UAV, tethered by a single cable to a ground power unit, demonstrated a capability that would redefine the broadcast industry over the next decade: unlimited endurance.

Today, Beijing Dagong Technology Co., Ltd. reflects on that pivotal moment in 2017 as the genesis of a new era. That thin "tether"—often described as an "umbilical cord"—has evolved from a niche solution for emergency communications into the backbone of broadcast-grade aerial live streaming, turning what was once a 30-minute flight limitation into 24 hours of uninterrupted aerial coverage.

The Tethered Advantage: Power and Data Without Limits
The fundamental breakthrough showcased at WMC 2017 was the decoupling of flight time from battery constraints. While traditional multi-rotor drones were grounded by 30-minute battery lives and unstable wireless video feeds, the tethered UAV system utilized a proprietary composite cable to deliver continuous ground power and high-bandwidth data transmission.

"From our earliest days, established in 2015, we realized that true industrial utility requires persistence," notes a spokesperson for Dagong Technology. "That cable is not a restriction; it is a highway. It solves the two greatest pains of live production: battery anxiety and signal latency."

The 2021 Milestone: The 'Helmsman's Perspective'
The transition from the experimental prototypes of 2017 to the industry standard for national events was solidified during the 2021 CPC Centenary Celebration in Tiananmen Square.

In a defining moment for Chinese broadcasting, Dagong Technology’s tethered UAV systems overcame complex airflow challenges to hover at a precise 100-metre altitude, delivering a never-before-seen "Helmsman’s Perspective" to global audiences. Crucially, the system transmitted 4K ultra-high-definition video via a stable 12G bandwidth baseband signal directly to the broadcasting van. This eliminated the compression artifacts and latency risks inherent in wireless links, allowing for a seamless, broadcast-grade feed that traditional "Flying Cat" systems simply could not achieve.

From 'Flying Camera' to 'Intelligent Air Node'
Over the past eight years, Dagong Technology has refined this technology to meet the rigorous demands of diverse sectors. The capabilities demonstrated at WMC 2017 have expanded far beyond simple hovering:

• Major Event Broadcasting: Ensuring zero-interruption coverage for national celebrations and sports events.

• Emergency Communication: Rapidly establishing temporary networks in disaster zones, a lineage tracing back to those early operator collaborations.

• Cultural Tourism: Acting as an "Airborne Live Room," offering immersive, long-duration aerial views of scenic sites.

As the low-altitude economy accelerates, the tethered UAV is undergoing its next evolution. Integrated with 5G and AI, Dagong Technology’s platforms are transitioning from simple "aerial cameras" to "intelligent air nodes"—capable of autonomous obstacle avoidance, multi-machine collaboration, and real-time data processing.

A Decade of Persistence
Looking back at the bustling WMC Shanghai in 2017, the contrast is stark. While the racing drones of that era have become toys for enthusiasts, the tethered technology, once relegated to a quiet corner, has become essential infrastructure. For Dagong Technology, that thin cable has connected a decade of innovation, proving that in the world of aerial broadcasting, endurance is the ultimate benchmark.

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