Introduction to LNB

An LNB assembles on the end of a face and arm the parabolic reflector ("dish") that focuses the signals from a satellite into the "feed horn" of the LNB.

The LNB to a lower frequency converts the signals and sends that signal out to the cable connector that you connect to your satellite receiver via coaxial cable.



Acts in 2 bands

  • 10.7 - 11.8 GHz and
  • 11.6 - 12.7 GHz (22 KHz signal switched)

Noise figure generally 1.0dB or better. It has a basic feed horn with 40mm neck presented in a number of models.

A universal LNB needs a 22 KHz signal at 0.5v p-p to change its local oscillator to 10.6GHz ("high band"). If not it uses its 9.75GHz oscillator ("low band"). Polarization switching is controlled through DC voltage supplied through the receiver. 12.5v to 14.5v provides vertical and 15.5 to 18v provide horizontal polarization.

A higher voltage than that might damage the LNB but most are OK up to 20v.


He twin output LNB gives two outputs to feed two different receivers for independent working. Every output can be switched freely through 13/7 volt input via the individual receiver to alter polarization and via 22KHz to alter the band.


This category of LNB has a single output and the actual satellite signal is chosen through the receiver that sends a Dis EqC (22KHz) pulsed tone up the LNB cable. Thus, just one satellite transmission may be viewed at a time.


This can provide for four separate receivers. Generally, an LNB along with four IF outputs. Every receiver has independent control of polarization and band via 13/17v switching and 22 KHz on/off correspondingly.


This contains four fixed outputs and is employed only in "head end" I.F distribution systems for apartment blocks.

One LNB supplies a head end unit which can give (typically) up to 16 outputs for separate digiboxes.

The four outputs of the LNB are expressed as follows:

1. Horizontal polarization low band

2. Horizontal polarization high band

3. Vertical polarization low band

4. Vertical polarization high band

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