While active, most of Astra 2D's transponders were used to provide television channels available on the Sky Digital satellite service to both Ireland and the United Kingdom, as well as the non-subscription service, Freesat.
AutoExpreso transponders can be replenished at Texaco, Puma, and Total stations in Puerto Rico or at designated replenishment lanes at select toll plazas.
The system operates using in-car 5.8GHz RFID transponders, generally manufactured by Kapsch or CS Route.
Manufactured by Thales Alenia Space in its Cannes Mandelieu Space Center, based on a Spacebus 4000C4 platform, it features up to 74 Ku band transponders (12 kW), a weight of about 5.5 tons, and has a lifetime of about 15 years (up to 2024).
Construction ran way ahead of schedule and the roadway from Exit 4 to Exit 8 was opened on February 14, 2009 for vehicles with SunPass and E-Pass transponders.
The HYLAS payload carries two transponders, intended mainly for HDTV, and six INSAT-3C
All the transponders provide coverage over India.Insat-3C is controlled from the Master Control Facility at Hassan in Karnataka.
ChampionChip, the leading manufacturer of race timing transponders.
The effect was first reported by persons working in the vicinity of radar transponders during World War II.
In April 2003, a second series of flight demonstrations focusing on "non-cooperative" aircraft (those without operating transponders), was conducted in restricted airspace near Mojave, California.