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Continuous tuning arrangement for a multiband television receiver

  • US 4,249,255 A
  • Filed: 11/30/1978
  • Issued: 02/03/1981
  • Est. Priority Date: 11/30/1978
  • Status: Expired due to Term
First Claim
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1. In a system for tuning a receiver to all the channels in at least first and second bands in response to respective magnitudes of a tuning voltage, apparatus comprising:

  • first and second terminals;

    a continuous resistive element coupled between said terminals, said resistive element having first and second sections corresponding to said first and second bands, respectively;

    voltage coupling means for coupling voltages to said first and second terminals;

    a movable contact;

    means for moving said movable contact along said resistive element to select ones of said channels, said tuning voltage being generated at said movable contact; and

    position detecting means for detecting the position of said movable contact along said resistive element;

    said voltage coupling means including at least first switching means coupled to said position detecting means for selectively coupling a first voltage to said first terminal when said movable contact is in said first section and a second voltage to said first terminal when said movable contact is in said second section, said first and second voltages being selected so that all of said channels in said first and second bands are tuned as said movable contact is continuously and consecutively moved along said resistive element.

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