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PLURAL CHANNEL FM REMOTE CONTROL SYSTEM

  • US 3,835,454 A
  • Filed: 10/10/1972
  • Issued: 09/10/1974
  • Est. Priority Date: 10/10/1972
  • Status: Expired due to Term
First Claim
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1. A remote control radio system comprising a plurality of adjustable controls with each control supplying a signal related to its adjustment, a radio transmitter for transmitting a radio wave at a carrier frequency, means for subdividing the radio wave into a continuously repeatable sequence with each sequence having a plurality of segments, there being one segment associated with each control, means for causing each segment of the wave to have a portion of the segment on one frequency and the remaining portion of the segment on another frequency with both frequencies being near the carrier frequency and means for relating the duration of each segment to the signal supplied by its associated control;

  • and a device located remotely from the transmitter and having a plurality of servo units with there being one servo unit for each control, each of said servo units having means for producing a response that is related to the duration of an electrical pulse supplied thereto, a receiver in the device having an antenna for receiving the transmitted wave and demodulating each segment of the wave into an electrical pulse having a duration related to the duration of the segment and means for directing the pulse from the same segment in each sequence to the same servo unit to cause said servo units to respond to the duration of the pulse directed thereto.

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