LNB
Pronunciation: L-N-B
Also written as: LNB — Low-Noise Block Downconverter
A combined low-noise amplifier and frequency downconverter mounted at the antenna feed, used in consumer satellite and VSAT terminals to shift the received satellite signal to a lower intermediate frequency for transmission via coaxial cable.
Full Definition
The LNB integrates the functions of the LNA and a block downconverter into a single compact unit, making it suitable for cost-sensitive applications such as direct-to-home (DTH) television and small VSAT terminals. It receives signals in the satellite downlink band (e.g., 10.7–12.75 GHz for Ku-band DTH), amplifies them with low noise, and converts the entire block of frequencies to a lower L-band range (950–2150 MHz) for cable distribution to indoor equipment. Editors must be careful not to substitute LNB for LNA in professional or teleport contexts, where the two components are physically separate.
Usage
Usage note: Use LNB specifically for units that combine amplification and downconversion. In professional ground station documents, LNA and downconverter are usually separate items; LNB is correct primarily in consumer and VSAT contexts.
In Context
- "The DTH dish is fitted with a universal LNB supporting both vertical and horizontal polarisations." — Consumer product datasheet
- "The VSAT outdoor unit uses an integrated LNB rather than the separate LNA and BDC found in teleport installations." — Equipment comparison report