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Video multiplying system

  • US 5,327,230 A
  • Filed: 12/24/1992
  • Issued: 07/05/1994
  • Est. Priority Date: 09/20/1989
  • Status: Expired due to Fees
First Claim
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1. A broadcast system for use with a video signal source having a source frequency, a power line and a monitor having a tunable frequency, comprising:

  • a transmitter, electrically connected to the power line, including;

    input means for receiving a video signal at the source frequency from the video signal source,modulation means for converting the signal from the source frequency to a broadcast frequency;

    transmitter output means, electrically connected to the power line, for electromagnetically radiating the signal from the power line at the broadcast frequency; and

    an antenna for receiving the electromagnetically radiated signal, including;

    six switches having input ends and output ends;

    an output having an output line and a return line, the return line connected to a ground;

    three antenna lines, the first antenna line connected to the input of the first switch and the input of the sixth switch, the second antenna line connected to the input of the fourth switch and the input of fifth switch, the connection between the input of the fourth switch and the input of the fifth switch forming a first loop, the third antenna line connected to the input of the second switch and the input of the third switch, the connection between the input of the second switch and the input of the third switch forming a second loop, the output of the first switch and the output of the second switch connected together to form a third loop and connected to the output line, the output of the third switch and the fourth switch connected together to form a fourth loop, the output of the fifth switch connected to the output line, and the output of the sixth switch connected to the return line, whereby the impedance of the output line may be adjusted by closing one or more of the six switches,demodulation means, connected to the output line, for converting the signal from the broadcast frequency to the tunable frequency, andantenna output means, connected to the modulation means, for outputting the signal at the tunable frequency to the monitor.

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