A low-emission noise regulator (LNB) mounted on satellite dishes used for satellite TV reception, which collects the radio waves from the dish and converts them into a signal sent by cable to the receiver in the building. Also called low-noise converter (LNC) or even low-intensity low-voltage transformer (LND), the device is sometimes incorrectly called low-noise amplifier (LNA). The LNB is a combination of low noise amplifier, frequency mixer, local oscillator and intermediate frequency (IF). It receives the microwave signal from the satellite collected by the plate, amplifies it and converts the frequency block down into a lower IF block. This conversion allows the signal to be transferred to the satellite TV receiver using a coaxial cable. If the signal remained at its original microwave frequency it would require a costly and impractical waveguide line.
Different types of LNB