Satellite signal distribution systems

A multiplexer for frequency multiplexing at least four satellite antenna output signals onto a cable, said signals including first and second wideband satellite antenna output signals and third and fourth narrowband satellite antenna output signals, comprising:

• three mixers coupled to receive said second, third and fourth satellite antenna output signals;
• a first local oscillator providing a signal to said mixer coupled to receive said second satellite antenna output signal, said first local oscillator having an output signal having a frequency higher than said frequency band of said first satellite antenna output signal, said first local oscillator frequency being selected to provide a mixer output difference signal having a first component frequency band higher than said first satellite antenna output signal;
• a second local oscillator providing a signal to said mixer coupled to receive said third satellite antenna signal, said second local oscillator having an output signal having a frequency lower than said frequency band of said first satellite antenna output signal and selected to provide a mixer output difference signal having a second component frequency band lower than said first satellite antenna output signal;
• a third local oscillator providing a signal to said mixer coupled to receive said fourth satellite antenna signal, said third local oscillator having an output signal having a frequency higher than said frequency band of said first satellite antenna output signal and selected to provide a mixer output sum signal having a third component frequency band higher than said first satellite antenna output signal;
• a plurality of filters, one coupled to receive the output of each of said mixers and each having a passband selected to correspond to a corresponding one of said component frequency bands;
• and a combiner for combining said first satellite antenna output signal with component frequency band signals output from said filters.

A demultiplexer for use with a satellite signal receiver, arranged to receive satellite signals in a satellite antenna output signal frequency band, for demultiplexing at least three satellite antenna signals provided with frequency multiplexing on a cable, including a first multiplexed satellite antenna signal in said satellite antenna output signal frequency band, and other component satellite antenna signals multiplexed with frequency inversion to higher, non-overlapping frequency bands, comprising:

• a first plurality of filters, each for selecting one of said multiplexed satellite signals;
• a second plurality of mixers, said second plurality being one less than said first plurality, each arranged to receive from corresponding ones of said filters one of said other component satellite antenna signals and a local oscillator signal;
• a second plurality of local oscillators, each associated with one of said mixers, each having a frequency higher than said satellite antenna output signal frequency band, and each having a frequency selected to convert one of said other component satellite antenna signals to said satellite antenna signal frequency band as a difference output signal of said associated mixer;
• and
• a switch for selecting a signal output from the output of a filter corresponding to said satellite antenna output signal frequency or the output signal from one of said mixers.

A system for providing independently selectable satellite television signals to a user having a plurality of satellite television receivers from shared satellite signal receiving antennas, comprising:

• a multiswitch having a first number of inport ports corresponding to a first number of available satellite signals derived from a plurality of satellite antennas and having a second number of output terminals corresponding to the satellite receiver capacity of said system, said multiswitch being responsive to supplied control signals to selectively connect any of said input ports to any of said output terminals;
• a frequency converting multiplexer for receiving at least two satellite signals from at least two output terminals of said multiswitch and for supplying a user output signal having said first and second satellite signals on first and second non-overlapping frequency bands;
• a cable connected to said multiplexer for transferring said user output signal to a user location;
• a frequency converting demultiplexer at said user location for providing said first and second satellite signals to first and second satellite receivers in the same satellite frequency band;
• and
• a control signal apparatus associated with said frequency converting demultiplexer for receiving selection signals from said receivers, for signalling said selection signals over said cable to a control unit associated with said multiswitch, wherein said control unit provides control signals to said multiswitch in accordance with selection signals provided by said receivers.