US2049677A - Heterodyne receiver - Google Patents

Heterodyne receiver Download PDF

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Publication number
US2049677A
US2049677A US649484A US64948432A US2049677A US 2049677 A US2049677 A US 2049677A US 649484 A US649484 A US 649484A US 64948432 A US64948432 A US 64948432A US 2049677 A US2049677 A US 2049677A
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United States
Prior art keywords
circuit
screen grid
tube
grid
anode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US649484A
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English (en)
Inventor
Urtel Rudolf
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Telefunken AG
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Telefunken AG
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Publication date
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes

Definitions

  • My present invention relates to superheterodyne receiving systems of the type wherein a single tube is used as a combined local oscillatorfirst detector.
  • FIG. 1 shows a combined local oscillator-first detector circuit of a type known in the prior art
  • Fig. 3 shows a combined local oscillator-first detector circuit embodying the invention
  • Fig. 2 shows the negative resistance characteristic of the screen grid circuit of the tube in Fig. 3.
  • Fig. 1 An arrangement of this kind is shown in Fig. 1 comprising the use of a twin-grid tube I, one grid of which is associated with the input circuit (EF) (for incoming waves), while the sec ond grid circuit contains the circuit (UF) tuned to the heterodyne or local oscillation frequency.
  • This circuit is excited by regeneration (RK) from the plate. From the plate circuit is derived the ensuing intermediate frequency (ZF).
  • the circuit scheme shown in Fig. 3 distinguishes itself by great simplicity (omission of supplementary feed-back circuit elements), and in addition it offers advantages as regards constancy and shape of the frequency curve.
  • the signals in Fig. 3 are impressed on input circuit EF, and the latter is coupled between the control grid and cathode of screen grid tube I.
  • the screen grid tube operating conditions are the same as when the tube operates as an amplifier; hence, the plate P is at a positive voltage, and the screen grid SG is at a positive voltage substantially less than that of to the desired local oscillation frequency, and the intermediate frequency is derived from the circuit ZF in the plate circuit.
  • Suitable by-pass condensers C are employed to by-pass radio frequency currents from the screen grid and plate circuits.
  • a dynatron oscillator-detector comprising a tube having a cathode, control grid, anode and screen grid, both anode and screen grid being positive relative to the cathode, the screen grid being sufficiently less positive than the anode to impart a negative resistance characteristic to the screen grid circuit, a tunable signal circuit between the control grid and cathode, a tunable local oscillationcircuit in the screen grid circuit adapted to generate local oscillations of a desired connected between the controlgrid and cathode, 3
  • an intermediate frequency circuit connected to the anode of said tube, a tunable local oscillation circuit connected to the screen grid of said tube, said screen grid being free of any regenerative couplings to any other electrode circuit of said tube, the anode and screen grid being at a positive potential with respect to the cathode, and the screen grid potential being sufiiciently less positive than the anode potential to introduce a negative resistance into the screen grid circuit.
  • a combined first detector and local oscillator network comprising a screen grid tube, a tunable signal circuit connected between the control grid and cathode, an intermediate frequency circuit connected to the anode of said tube, a tunable local oscillation circuit connected to the screen grid of said tube, said screen grid being free of any regenerative couplings to any other electrode circuit of said tube, the anode and screen grid being screen grid potential being sufilciently less than the anode potential to impart a negative resistance to the discharge space between the cathode and the screen grid, a signal input circuit connected between the signal grid and cathode, a local oscillation circuit in the screen grid circuit tuned to a frequency differing from the signal circuit frequency by a desired beat frequency, a resonant circuit connected to the anode of the tube and tuned to the beat frequency, said screen grid circuit being free of any regenerative cou-- pling with any other electrode circuit of the tube.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
US649484A 1931-12-09 1932-12-30 Heterodyne receiver Expired - Lifetime US2049677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2049677X 1931-12-09

Publications (1)

Publication Number Publication Date
US2049677A true US2049677A (en) 1936-08-04

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ID=7982591

Family Applications (1)

Application Number Title Priority Date Filing Date
US649484A Expired - Lifetime US2049677A (en) 1931-12-09 1932-12-30 Heterodyne receiver

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US (1) US2049677A (2)
DE (1) DE604423C (2)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963578A (en) * 1949-06-11 1960-12-06 Automatic Elect Lab Signal translation apparatus employing transistors
US3347772A (en) * 1964-03-02 1967-10-17 Schjeldahl Co G T Rf sputtering apparatus including a capacitive lead-in for an rf potential

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2963578A (en) * 1949-06-11 1960-12-06 Automatic Elect Lab Signal translation apparatus employing transistors
US3347772A (en) * 1964-03-02 1967-10-17 Schjeldahl Co G T Rf sputtering apparatus including a capacitive lead-in for an rf potential

Also Published As

Publication number Publication date
DE604423C (2)

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