Editing Low-noise block downconverter (section)

===Satellite channel router (SCR), or unicable LNBs===
Multiple tuners may also be fed from a [[satellite channel router]] (SCR) or [[unicable (technology)|unicable]] LNB in a [[single cable distribution]] system. A Unicable LNB has one output connector but operates in a different way to standard LNBs so it can feed multiple tuners daisy-chained along a single coax cable.

Instead of block-downconverting the whole received spectrum, an SCR LNB downconverts a small section of the received signal (equivalent to the bandwidth of a single transponder on the satellite) selected according to a [[DiSEqC]]-compliant command from the receiver, to output at a fixed frequency in the IF. Up to 32 tuners can be allocated a different frequency in the IF range and for each, the SCR LNB downconverts the corresponding individually requested transponder.<ref>Bains, Geoff. "Inverto Unicable LNB" ''What Satellite & Digital TV'' (February, 2006) pp60-62"</ref>

Most SCR LNBs also include either a legacy mode of operation or a separate legacy output which provides the received spectrum block-downconverted to the whole IF range in the conventional way.

[[Image:FibreLNB.jpg|thumb|right|120px|An optical fibre LNB (with fibre connection and conventional F-connector for power input)]]