3 Scanning Channels
3.1 Understanding Satellite TV
A broadcast satellite’s channels are called transponders. A transponder gath-
ers signals over a range of uplink frequencies and retransmits them on a dif-
ferent set of downlink frequencies to receivers on Earth. Multiple TV chan-
nels are broadcast through a transponder. A transponder has three main
components: frequency, symbol rate, and polarization.
To get the latest information about satellite TV transponders, visit http://
www.lyngsat.com.
An LNB is the receiving device on a satellite dish. It downconverts a block of
frequencies to a lower block of intermediate frequencies, ranging from 950
MHz to 2150 MHz, so that the signal can be carried to a satellite TV receiver.
An LNB produces a particular frequency to do this. For example, an LNB
producing 5150 MHz is supposed to receive a frequency band that ranges
from 3000 to 4200 MHz, so that the absolute difference between the LNB
frequency and any frequency within the band falls within the range of the
intermediate frequencies.
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