Glossary
aperture: A cross sectional area of the antenna exposed to the satellite signal
bandwidth: A specified part of the electromagnetic spectrum used
c band: The 4-8 GigaHertz (GHz) frequency band, of which 4-6 GHz is used for satellite communications
digital: Conversion of information into bits of data for transmission through
wire, fibre optic cable, satellite, or over air techniques. It allows simultaneous transmission of voice, data and video
downlink: The satellite-to-earth half of a 2-way telecommunications satellite link. Often refers to the receiving dish-end of the link
ku band: The 10.9-17 GHz frequency range
panchromatic: Sensitive to all colours
spectrum: The range of electromagnetic radio frequencies used in transmission of voice, data and television
spot beam: A focused antenna pattern sent to a limited geographical area. Satellites use spot beams to deliver certain transponder signals to geographically well-defined areas such as a state
transponder: A combination receiver, frequency converter, and transmitter package, physically part of a communications satellite. Transponders operate over a frequency band with a 36-72 Megahertz bandwidth in the L, C, Ku, and sometimes Ka Bands
v-sat: Very small aperture terminal. It refers to small earth stations requiring a dish antenna with a diameter of 1.2-2.4 metre
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