Low Noise Block Down-Converter (LNB), C-Band
A Low Noise Block Converter (LNB) is an electronic device combining a Low Noise Amplifier (LNA) and a Block Down-Converter. The LNB is attached to the waveguide interface of the feed and is part of the Out-Door Unit (ODU).
C-Band ranges from 4 to 8 GHz. It was the original frequency allocation for telecommunications satellites and is still largely used today. Standard C-Band satellites use the frequency range from 3.7 to 4.2 GHz for downlink - from satellite to earth.