What is a Universal Ku LNB (9.75/10.6 GHz, 22 kHz)?
A Universal Ku LNB is a dual-oscillator LNB that covers the entire Ku FSS and DBS band (10.7-12.75 GHz) by switching between two local oscillator frequencies: 9.75 GHz for the low band and 10.6 GHz for the high band. The receiver selects the high band by sending a 22 kHz tone to the LNB, and selects polarization using 13V (vertical) or 18V (horizontal). This makes one LNB compatible with virtually all standard Ku-band satellites.
Without the two oscillators, a single-LO LNB could only cover part of the Ku spectrum. By splitting the band and switching LOs, the Universal LNB keeps the downconverted L-band output within the 950-2150 MHz range that receivers expect, across the full satellite band.
The control scheme is standardized: no 22 kHz tone selects the 9.75 GHz low band, while applying the 22 kHz tone switches to the 10.6 GHz high band. Combined with 13/18V polarization switching, a single coaxial cable carries all necessary commands and signal. This universality is why the Universal LNB is the default choice for most DTH installations worldwide.