1090 ES

978 UAT ADS-B ADS-B In ADS-R avionics FIS-B weather general aviation avionics TIS-B UAT 978 MHz

Cleared Direct Aug 23, 2026

The Two ADS-B Frequencies, Nine Seventy-Eight UAT and Ten Ninety ES, and the ADS-R Rebroadcast That Had to Stitch America's Split Datalink Back Together

Why US ADS-B runs on two frequencies, how ADS-R stitches them together, and why a receive-only box hides traffic from you.

Vector

Cleared Direct Jul 29, 2026

The Nine Seventy-Eight Megahertz UAT, the Universal Access Transceiver, and Why America Split Its ADS-B Onto Two Frequencies When the Rest of the World Uses One

Why the U.S. runs ADS-B on two frequencies - 978 MHz UAT and 1090 ES - and what it means for your cockpit traffic and weather.

Vector