Receiving satellite switching apparatus

A receiving satellite switching apparatus for a satellite communication receiving station in which polarized signals sent from a satellite are received by a multibeam antenna and one of the polarized signals is led to a receiver, said apparatus comprising:

• low-noise block converters for converting polarized signals, received from the satellite by the multibeam antenna, into respective prescribed intermediate-frequency signals;
• connection means, operatively connected to each output terminal of said low-noise block converters via first coaxial cables and an input terminal of said receiver via a second coaxial cable, for connecting the intermediate-frequency signals from said low-noise block converters to said receiver;
• a voltage-sensing type changeover unit for receiving a DC voltage of a prescribed level, which corresponds to one of the polarized signals, from said receiver via the second coaxial cable, and inputting a DC feed voltage to one of the first coaxial cables connected to whichever one of the low-noise block converters corresponds to the prescribed voltage level;
• first DC voltage blocking units, provided between said low-noise block converters and said connection means, for blocking DC feed voltages applied to said connection means via the first coaxial cables;
• and
• a second DC voltage blocking unit, provided between said connection means and said receiver, for blocking DC feed voltages applied to said connection means via the second coaxial cable.

A receiving satellite switching apparatus for a satellite communication receiving station in which polarized signals sent from a satellite are received by a multibeam antenna and one of the polarized signals is led to a receiver, said apparatus comprising:

• low-noise block converters for converting polarized signals, received from the satellite by the multibeam antenna, into respective prescribed intermediate-frequency signals;
• connection means, operatively connected to each output terminal of said low-noise block converters via first coaxial cables and an input terminal of said receiver via a second coaxial cable, for connecting the intermediate-frequency signals from said low-noise block converters to said receiver;
• a satellite changeover unit for selecting one of the polarized signals, generating a DC voltage of a level corresponding to a polarized signal selected and applying the generated DC voltage to the second coaxial cable;
• first DC voltage blocking units, provided between said low-noise block converters and said connection means, for blocking DC feed voltages applied to said connection means via the first coaxial cables;
• second and third DC voltage blocking units provided between said connection means and said receiver for blocking input, to said connection means and said receiver, respectively, of the DC voltage applied to the second coaxial cable from said satellite changeover unit;
• and
• a voltage-sensing type changeover unit for receiving the DC voltage of the level, which corresponds to the polarized signal, from said satellite changeover unit via the second coaxial cable, and inputting a DC feed voltage to one of the first coaxial cables connected to whichever one of the low-noise block converters corresponds to the level of said DC voltage.