An LNA is a low-noise amplifier. An LNB is an LNA plus a Block converter circuit that shifts the frequencies downward. A DirecTV LNB shifts the satellite frequencies 12.2-12.7 GHz (Ku band) down to 950-1450 MHz. This conversion is necessary because Ku band frequencies will not travel very far in ordinary coaxial cable.
An LNBF is an LNB plus a Feed horn assembly.
LNBs and LNBFs can be found at the focus point of a satellite dish antenna.
LNB (Low Noise Block-converter), LNBF
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