Table 3 lists the Local Oscillator frequencies for various LNBs. Do note that since S and Extended C
Band LNBs are not used universally, the local oscillator frequency indicated is typical but not an
international standard.
The output frequency is directly related to the local oscillator frequency. Hence it is very important
to have an extremely stable (fixed) local oscillator frequency. To ensure this, most LNBs utilise a
crystal oscillator for the LO. This ensures that the LO frequency does not change either with the
Input voltage to the LNB or due to temperature changes that the LNB is exposed to. Keep in mind
that the LNB is mounted outdoors and is often subjected to sub-zero temperatures with high wind
velocities or high ambient temperatures when directly exposed to sunlight in tropical climates such
as India.