LNB (Low Noise Block Converter) Selection Guide

In satellite TV systems, LNB (Low Noise Block Converter) is one of the key components, which is to receive weak signals transmitted from satellites and convert them into low-frequency signals that satellite receivers can process. Choosing a suitable LNB can significantly improve the quality of signal reception. This article will explain in detail how to choose a suitable LNB for your satellite antenna.

1. Basic functions of LNB
LNB (Low Noise Block downconverter) is a low noise downconverter, which has three core functions:

Receive satellite signals (usually C-band or Ku-band)
Reduce signal noise (“low noise” part)
Convert high-frequency signals to low-frequency signals suitable for coaxial cable transmission (“downconverter” part)
2. Key factors for selecting LNB
2.1 Satellite signal frequency band

C-band LNB (3.7-4.2GHz): usually used for large parabolic antennas (above 1.8 meters), suitable for receiving traditional satellite TV signals
Ku-band LNB (10.7-12.75GHz): used for small and medium-sized antennas (0.6-1.2 meters), modern satellite TV mainly uses this frequency band
2.2 LNB types

Single output LNB: the most basic model, can only receive one polarization signal at a time
Dual output LNB: can receive horizontal and vertical polarization signals at the same time
Quad LNB: four independent outputs, suitable for multi-room installation
Octo LNB: eight independent outputs, ideal for large installations
Universal LNB: automatically switches between high and low frequency bands
Single LO/Dual LO LNB: choose according to reception needs
2.3. Local Oscillator Frequency

Must match the satellite signal you receive:

Universal Ku-band LNB: 9.75GHz/10.6GHz
C-band LNB: usually 5.15GHz
2.4 Feed Type

Standard Feed: Suitable for most parabolic antennas
Offset Feed: Suitable for offset feed antennas
3. Installation precautions

Waterproof treatment: Make sure the LNB connection is well sealed
Precise alignment: The polarization angle and focal length of the LNB must be accurately adjusted
Wire quality: Use high-quality coaxial cable to reduce signal loss
Lightning protection: Install lightning protection devices in areas prone to lightning