Universal LNB
The Universal LNB can receive either horizontal or vertical polarisations depending
on the LNB line voltage. 13V is used to select Vertical polarisation and 18V is used
to select Horizontal polarisation.
The Ku band for satellite reception is 2050 MHz wide (12750 - 10700) while the
receiver input is only 1100 MHz wide (2150 – 950). To allow the full reception of the
entire Ku band, two different local oscillator (LO) frequencies are used in the
Universal LNB. This LO frequency is switched in the Universal LNB by using the 22
KHz tone. When it is off, then the LO frequency used is 9750 MHz and when on,
10600 MHz is used.
The four frequency ranges for the Universal LNB are sometimes called quadrants
and is diagrammed below showing the overlap.
13V
Vertical
22 KHz Off
Low Band
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