TA0321 Datasheet, PDF (1/12 Pages) STMicroelectronics – TECHNICAL ARTICLE

TA0321
TECHNICAL ARTICLE
Lightning protection for LNB supply and control voltage regulator
Introduction
Communication satellites operate within two frequency bands for TV/Broadband service broadcast
signals, C Band and Ku Band. The C Band overall frequency spectrum is 4.0 GHz - 8.0 GHz, while the Ku
Band overall frequency spectrum is 10.7 GHz - 18.4 GHz.
Within these bands each satellite has a specific uplink and downlink frequency allocation.
For example:
■ Ku Band downlink frequency is 10.7 GHz-12.75 GHz and uplink frequency is 17.3 GHz-17.8 GHz.
■ C Band downlink frequency is 3.7 GHz-4.2 GHz and uplink frequency is 5.925 GHz-6.425 GHz
To use the frequencies that are available for satellite broadcast as efficiently as possible, and to
accommodate an additional number of channels within a given frequency band, the transmission signal
can be formatted to be either vertical and horizontal, or circular right-hand and circular left-hand
simultaneously per frequency.
UPLINK
DOWNLINK
January 2006
Rev 1
1/12
www.st.com
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