LNB stands for Low Noise Block and is also called LNC, which stands for Low Noise Converter. It’s used for the reception of broadcasting satellite. LNB is always found fixed inside or on the satellite dish itself. It is also essential to use the right LNB for the right satellite dish.

Low Noise refers to the first stage input amplifier transistor. It is measured by Noise Temperature, Noise Figure and/or Noise factor Units. Noise Figure & Factor both can be easily converted to Noise Temperatures. Preferably lower noise temperature is considered superior. It also indicates that intensification and mixing is done before cable attenuation & it is completed in a circuit that requires no power supply or receiver.

Whereas the term ‘Block’ reflects the exchange of higher block of microwave frequencies into lower ones i.e. transformed down to a lower block range of frequencies for the recipient.

PURPOSE:

The purpose of the LNB is to consume the super heterodyne effect, intensify it and then convert it into a broad block (band) of frequencies. This basically helps recompense the signal loss associated with typical coaxial cable at comparatively high frequencies.

The LNB assists to defend the overall sound and picture of satellite TV from becoming greatly degraded & this is done without introducing a much larger dish reflector.

LNB FEEDHORNS:

The DBS stands for Direct Broadcast Satellite dishes use the LNBF. What exactly does it do? It works by matching the antenna’s feed horn up with the LNB.

Mostly, the small diplexers are used to assign the IF signal that comes out within the range of 950 MHz to 1450 MHz and piggyback these signals with same cable of the TV that have low frequency television signals from an outdoor antenna.

The receiver also has one other diplexer, which is in TV set that separates the signals.

The Standard DBS examples are given below:

1.     LO (Local Oscillator) with frequency of 11.25 GHz

2.     Frequency ranges between 12.2 GHz to 12.7 GHz

3.     NF (Noise Figure) 0.7 dB

4.     Polarization is circular

UNIVERSAL LNB’s:

A universal LNB is the one which can receive polarizations and wide range of frequencies in C and Ku satellite band.

The Universal LNB specifications are given below:

1. (LO) Local Oscillator 9.75 GHz  (and can be 10.6 GHz)
2. Frequency ranges between 10.7 GHz to 12.75 GHz
3. (NF) Noise Figure 0.7 dB
4. Polarization is Linear

DUAL LNB:

Simply we can define the Dual LNB as an LNB with two outputs.

A Dual LNB will help the customer to attach two televisions to his satellite dish and then tune into different channels on each television discretely.

Triple & Quad LNB’s are also accessible for spectators with more than two television receivers.

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