LNB (Low-Noise Block Downconverter): Buy in Nairobi, from Pro-Logic Technologies
The LNB (Low-Noise Block downconverter) is arguably the most technically critical component in a satellite TV installation. Mounted at the focal point of the satellite dish on a metal arm, it performs two vital functions: amplifying the extremely faint satellite signals captured by the dish, and converting those signals from microwave frequencies down to a range that standard coaxial cable can carry efficiently. Without a quality LNB, even the most precisely aimed dish on a perfect mount will deliver poor results. Pro-Logic Technologies in Nairobi stocks a comprehensive selection of LNBs for DSTV, free-to-air, and universal satellite applications.
The Two Jobs of an LNB
The “L” in LNB stands for low-noise — referring to the amplifier section of the device. Satellite signals arrive at the dish having travelled nearly 36,000 kilometres, making them extraordinarily weak by the time they reach Earth. The LNB’s first job is to amplify these signals using a very low-noise transistor circuit, adding as little electronic noise as possible. The noise figure of an LNB (measured in decibels) indicates how much noise the device adds — the lower the figure, the better.
The “B” stands for block — referring to the downconverter section, which shifts the entire block of satellite frequencies (10.7–12.75 GHz) down to a range of 950–2150 MHz. This lower frequency range travels down standard RG6 coaxial cable with acceptable losses, whereas the original microwave frequencies would suffer prohibitive losses over even a short cable run.
Universal vs. Single-Band LNBs
Universal LNBs are the most commonly used type in home installations. They cover the full Ku-band frequency range (10.7–12.75 GHz) and use a switching tone signal from the decoder to select between the low and high sub-bands. They are compatible with virtually all modern satellite decoders.
Wideband LNBs output across the entire band simultaneously without sub-band switching, enabling multi-tuner and multi-room installations without complex switching hardware. They are increasingly popular in advanced home theatre setups.
Single vs. Twin vs. Quad LNBs
A single LNB feeds one decoder. A twin LNB has two outputs for two independent decoder tuners — essential for PVR decoders that need two separate tuner inputs simultaneously (to record one channel while watching another). A quad LNB feeds four outputs for larger installations.
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