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High frequency radio receiver

  • US 3,327,222 A
  • Filed: 10/14/1963
  • Issued: 06/20/1967
  • Est. Priority Date: 10/14/1963
  • Status: Expired due to Term
First Claim
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1. A RECEIVING SYSTEM COMPRISING A FIRST SERIES OF PIEZO-ELECTRIC FREQUENCY DETERMINING CRYSTALS RESONANT AT UNIFORMLY SPACED FREQUENCY INCREMENTS IN AN ASSIGNED ORDER AND WHICH REPEAT THE ASSIGNED ORDER AT LEAST TWICE DURIN THE TUNING OF SAID RECEIVING SYSTEM THROUGH ITS ENTIRE SELECTABLE FREQUENCY RANGE, A SECOND SERIES OF PIEZO-ELECTRIC FREQUENCY DETERMINING CRYSTALS RESONANT AT FREQUENCY INCREMENTS WHICH ARE SIMPLE FRACTIONS OF THE FREQUENCY INCREMENTS OF THE CRYSTALS OF SAID FIRST SERIES AND ARRANGED IN A PRESELECTED ASSIGNED ORDER WITH EACH CRYSTAL IN SAID SECOND SERIES ASSIGNED A SINGLE INCREMENTAL VALUE, A FIRST INTERMEDIATE FREQUENCY AMPLIFIER HAVING AT LEAST TWO DISCRETE SWITCHABLE BANDPASS FREQUENCY RANGES, EACH OF SAID RANGES BEING SUFFICIENTLY WIDE TO PASS A FREQUENCY RANGE AT LEAST AS WIDE AS THE MAXIMUM DIFFERENCE BETWEEN THE LOWEST AND THE HIGHEST FREQUENCY IN SAID SECOND CRYSTALS SERIES, A SERIAL ARRANGEMENT COMPRISING A RADIO FREQUENCY AMPLIFIER, A FIRST MIXER, SAID FIRST INTERMEDIATE FREQUENCY AMPLIFIER, A SECOND MIXER, A SECOND INTERMEDIATE FREQUENCY AMPLIFIER BEING FIXED TUNED TO A REFERENCE FREQUENCY, A FIRST SWITCHING MEANS FOR SELECTIVELY SWITHCING CRYSTALS OF SAID FIRST SERIES INTO THE CIRCUIT OF A FIRST OSCILLATOR TO DETERMINE THE FREQUENCY THEREOF, MEANS FOR APPLYING THE OUTPUT OF SAID FIRST OSCILLATOR TO SAID FIRST MIXER, A SECOND OSCILLATOR, A SECOND SWITCHING MEANS FOR SELECTIVELY SWITCHING CRYSTALS OF SAID SECOND SERIES INTO THE CIRCUIT OF SAID SECOND OSCILLATOR TO DETERMINE THE FREQUENCY THEREOF, SAID SECOND SWITCHING MEANS OPERABLE TO MAINTAIN SAID CRYSTALS IN SAID SECOND SERIES IN SAID ASSIGNED ORDER DURING THE SWITCHING THEREOF SO THAT EACH CRYSTAL IN SAID SECOND SERIES RELATES TO ONLY ONE OF SAID SECOND SERIES FREQUENCY INCREMENTS, MEANS FOR APPLYING THE OUTPUT OF SAID SECOND OSCILLATOR TO SAID SECOND MIXER, MEANS OPERATED BY THE SWITCHING OF A CRYSTAL OF SAID FIRST SERIES INTO THE CIRCUIT OF SAID FIRST OSCILLATOR FOR SELECTING THE FREQUENCY RANGE OF SAID FIRST INTERMEDIATE FREQUENCY AMPLIFIER TO A FREQUENCY RANGE WHICH INCLUDES THE DIFFERENCE OF THE INCOMING SELECTED SIGNAL FREQUENCY MINUS THE SELECTED FIRST OSCILLATOR FREQUENCY, SAID OPERATED MEANS OPERABLE TO ALLOW SAID FIRST AND SECOND SERIES SELECTION MEANS TO SELECT CRYSTALS IN THEIR RESPECTIVE SERIES INDEPENDENTLY OF EACH OTHER WITH SAID CRYSTALS IN SAID SECOND SERIES MAINTAINING SAID PRESELECTED SINGLY ASSIGNED ORDER AND RELATING TO ONLY ONE ASSIGNED FREQUENCY INCREMENT.

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