What is LNB and LNBF?

[Antenna dish]

What is LNB and LNBF?
*LNB refers to Low Noise Block.* LNBF refers to Low Noise Block Feed.
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What is the difference between LNB and LNBF?
Usually LNB receives signal from just one polarity. Then the others are nearly LNBF.*In general, Vertical and Right pol. are on 13V DC operating, and Horizontal and Left pol. are on 18V DS operating.
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What is the difference between Standard, Normal and Universal Ku band LNBF?
Usually there ate there types of LNF, they are Standard LNBF, Normal LNBF and Universal LNBF. Frequency range from 11.7GHz to 12.2GHz represents Standard & Normal LNBF; frequency range from 10.7GHz to 12.75GHz represents Universal LNBF. Universal type is popular in Europe and the Middle East.

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What is linear and circular LNBF?
Linear refers to H and V pol.* ;While Circular refers to L and R pol. *

Is C band*Linear*or*Circular?
C band can be both linear or circular polarization. Ku band can be two types, but usually linear pol.