LNB (Low-Noise Block Downconverter)
An LNB is a device mounted at the focal point of a satellite dish that receives, amplifies, and downconverts satellite signals for processing.
The LNB is the first active component in the satellite reception chain. It converts the high-frequency satellite signal (10.7-12.75 GHz for Ku-band) to a lower intermediate frequency (950-2150 MHz) suitable for cable transmission to the receiver.