Search results
Results from the WOW.Com Content Network
Today "dual LNB" (and "dual feed") describes antennas for reception from two satellite positions, using either two separate LNBs or a single Monoblock LNB with two feedhorns. In the UK, the term "twin-output LNB", or simply "twin LNB", is usually used for an LNB with a single feedhorn but two independent outputs. [3]
In an optical fibre system at the LNB the four sub-bands are "stacked" in frequency, one above the other, at 0.95 GHz-3.0 GHz (the whole frequency range received in vertical polarisation) and 3.4 GHz-5.45 GHz (horizontal polarisation) and transmitted together as a modulated optical signal down the fibre cable using a 1310 nm semiconductor laser.
A twin-output Duo LNB fitted to a 60 cm dish with only one output connected. (Note that this LNB is mounted using the 19.2°E feedhorn, not in accordance with SES' installation guidelines) A Duo LNB is a double low-noise block downconverter (LNB) developed by SES for the simultaneous reception of satellite television signals from both the Astra ...
In the LNB they become down converted to 950–2150 MHz, which is the frequency range allocated for the satellite service on the coaxial cable between LNBF and receiver. Lower frequencies are allocated to cable and terrestrial TV, FM radio, etc. Only one of these frequency bands fits on the coaxial cable, so each of these bands needs a separate ...
Two monoblock LNB can be connected to one receiving dish using Multi-satellite techniques. However, the expected results of such connections may vary or be sub-optimal. The results may yield low-level signals from some or all of the satellites or it may work well in certain geographically favorable locations.
A "stacked" LNB (both polarisations output at once on different frequencies) on a single satellite needs only a signal splitter, not a true multiswitch. The splitter must be able to pass DC power from one of the receivers to the LNB without interference.
Special LNBs have been developed for use in single-cable distribution systems. All four sub-bands of the Ku band (low frequency/horizontal polarity, high frequency/horizontal polarity, low frequency/vertical polarity, high frequency/vertical polarity) are received by a conventional front end, amplified and downconverted to the L-band, to be fed to a number of SatCR (Satellite Channel Router ...
DirecTV supplies BBCs with all 5-LNB K u /K a-band dish systems. The satellite signal from T10 is downconverted at the dish to the frequency range of 250-750 MHz, called "K a-lo". At the receiver when necessary, the BBC in response to a control signal from the receiver blocks any original "K a-hi" signals between 1650-2150 MHz. Then up-converts ...