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Lnb tv satellite.
Also called a low noise block low noise converter lnc or even low noise downconverter lnd the device is sometimes.
The difference between them all is the amount of outputs that the lnb itself has this allows extra satellite receivers to be added for extra tv points and for the addition of satellite pvr s that has recordable pause play and rewind tv services like sky and freesat that require two separate lnb connections to work properly.
A low noise block downconverter lnb is the receiving device mounted on satellite dishes used for satellite tv reception which collects the radio waves from the dish and converts them to a signal which is sent through a cable to the receiver inside the building.
Universal lnb s work by varying a supplied voltage form the satellite tv receiver which can switch the lnb between receiving horizontal and vertically polarized signals.
And by applying continuous 22khz tone it turns the lnb between a high and low band.