33 Glossary: T-V
Description
This article is from the TeleVision Receive Only Satellite-TV FAQ, by TVRO Hobbyists drlev@hotmail.com with numerous contributions by others.
33 Glossary: T-V
Transponder: Electronic package aboard a telecommunications satellite
that 1) receives transmissions from earth (uplink); 2) changes signal
frequency; 3) amplifies the signal; and, 4) transmits the signal to
earth (downlink). Modern communications satellites use 24 or more
transponders and can be C-Band, Ku-Band, or both.
TVRO (Television Receive Only): An earth station or downlink capable
of receiving but not transmitting satellite TV signals.
Uplink: 1. To transmit a signal from an earth station to a particular
communications satellite transponder. The earth station capable of
transmitting a signal to a satellite.
Vertical Blanking Interval (VBI): The first 21 lines of the 525
horizontal line standard television picture. These 21 lines do not
contain picture information and can be used to convey ancillary
information, such as test signals and/or data.
VSAT (Very Small Aperture Terminal): A small Ku-Band earth station
used by private networks for receipt of broadcast transmission of data
or video as well as interactive communication with a host computer or
database for a multitude of applications.
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