Cold Temperatures
It is possible for any moisture in an LNB to physically freeze due to ice build-up in very low temperatures. This is only likely to occur when the LNB is not receiving power from the satellite receiver (i.e. no programmes are being watched). To combat this, many satellite receivers provide an option to keep the LNB powered while the receiver is on standby. In fact most LNBs are kept powered because this helps to stabilise the temperature and, thereby, the local oscillator frequency by the dissipated heat from the circuitry of LNB. In the case of UK BSkyB receivers, the LNB remains powered while in standby so that the receiver can receive firmware updates and Electronic Programme Guide updates. In the United States the LNB connected to Dish Network receivers remains powered as well as those receivers that receive software and firmware updates and guide information over the air at night. In Turkey, another LNB type Digiturk MDUs are kept powered to receive VOD content, STB firmware, EPG data and pay TV keys in order to watch encrypted content.
Read more about this topic: Low-noise Block Downconverter
Famous quotes containing the word cold:
“That cold accretion called the world, which, so terrible in the mass, is so unformidable, even pitiable, in its units.”
—Thomas Hardy (1840–1928)