received signal quality downlink
21Air-ground radiotelephone service — is a method of telephone communications used by aircraft pilots and passengers of commercial airline jets flying over the United States.The air ground radiotelephone service operates on frequencies designated by the Federal Communications… …
22Diversity scheme — Terrestrial microwave radio system with two antenna arrays configured for space diversity In telecommunications, a diversity scheme refers to a method for improving the reliability of a message signal by using two or more communication channels… …
23Time division multiple access — This article is about the channel access method. The name TDMA is also commonly used in the United States to refer to Digital AMPS, which is an obsolete mobile telephone standard that uses TDMA to control channel access. Time division multiple… …
241worldspace — Infobox Company company name = 1worldspace Inc. company company type = Public NASDAQ|WRSP foundation = 1990 location = Silver Spring, Maryland, U.S. key people = Noah A. Samara, Chairman CEO num employees = 492 (2005) industry = Broadcasting… …
25Satellite TV — ▪ 1997 by Robert Stoffels By the end of 1996, several thousand artificial satellites were circling the Earth. About 1,000 of them were in a geosynchronous orbit that is, they were located over the Equator at an altitude of 35,900 km (22,300 …
26Earth station — An earth station or ground station is the surface based (terrestrial) end of a communications link to an object in outer space. The space end of the link is occasionally referred to as a space station (though that term often implies a human… …
27Control channel — In radio communication, a control channel is a central channel that controls other constituent radios by handling data streams. It is most often used in the context of a trunked radio system, where the control channel sends data which coordinates …
28DIRECTV blimp — in NC. 2011 DIRECTV Blimp over NYC …
