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UHF electronic tuner

  • US 4,145,659 A
  • Filed: 05/25/1977
  • Issued: 03/20/1979
  • Est. Priority Date: 05/25/1977
  • Status: Expired due to Term
First Claim
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1. A UHF varactor tuner comprising:

  • preselector means for passing a select radio frequency signal, said preselector means including a housing containing resonant cavities, a plurality of transmission lines and a plurality of varactor diodes for providing variable half-wave tuning of said transmission lines, said transmission lines being contained in respective resonant cavities of said housing and being aperture intercoupled by aperture means in the walls of said resonant cavities;

    oscillator means for generating an oscillator signal;

    mixer means coupled to heterodyne said oscillator signal with said select radio frequency to result in an intermediate frequency signal; and

    said preselector means further including frequency dependent circuit means coupled between said tuned transmission lines and operative primarily at one end of the UHF band of frequencies to augment said aperture intercoupling and thereby provide said preselector means with a substantially uniform bandwidth over the entire UHF band.

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