US2230108A - Superregenerative receiver - Google Patents

Superregenerative receiver Download PDF

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Publication number
US2230108A
US2230108A US289335A US28933539A US2230108A US 2230108 A US2230108 A US 2230108A US 289335 A US289335 A US 289335A US 28933539 A US28933539 A US 28933539A US 2230108 A US2230108 A US 2230108A
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United States
Prior art keywords
potential
frequency
tube
interrupting
anodes
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Expired - Lifetime
Application number
US289335A
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English (en)
Inventor
Gerhard Ernst
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Telefunken AG
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Telefunken AG
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Publication date
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Publication of US2230108A publication Critical patent/US2230108A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D11/00—Super-regenerative demodulator circuits
    • H03D11/02—Super-regenerative demodulator circuits for amplitude-modulated oscillations

Definitions

  • This invention relates to a superregenerative receiver.
  • the device disclosed affords a high sensitivity, through the particular choice of the potential curve of the interrupting frequency, for short wave and more particularly for ultra-short waves.
  • Figure 1 of the accompanying drawing shows graphically a plot the preferred interrupting frequency potential in relation to time, this figure being referred to in explaining the operation of my invention.
  • Fig. 2 shows a circuit diagram of a preferred embodiment.
  • the invention resides in applying the interrupting frequency to the receiving tube in the form of periodic sharp potential peaks.
  • the form of these potential peaks preferably corresponds with the curve of Fig. 1 in which time is plotted in the abscissa while the ordinate represents the plate potential Ep.
  • Fig. 2 The manner in which the potential peaks are produced is immaterial. However, an especially simple arrangement is represented by the circuit shown in Fig. 2. This circuit contains a magnetron tube 4 for decimeter waves.
  • the magnetron tube 4 possesses split anodes 8 and a cathode 9 centrally disposed with respect to the anodes.
  • the cathode is heated by a direct current source NJ, while anode potential is supplied by the direct current source II.
  • the discharge zone of the magnetron tube is also traversed by a magnetic field which may be produced either by an electromagnetic winding, or by a permanent magnet [2, as shown.
  • Each of the split anodes has connected thereto one of a pair of conductors l3 constituting a Lecher wire system or antenna. By means of the conductive bridge I4 tuning of the antenna system may be obtained.
  • the mid-point of the bridge l4 has connected thereto a conductor l5" which leads to the choke 3 and thence through a tuned circuit consisting of the primary winding of the transformer 5 in parallel with which is a capacitor IS.
  • the plate potential supply source II is also connected to the primary of the transformer 5. It will thus be seen that the plate potential applied to the magnetron consists of a direct potential superposed by periodic potential peaks.
  • the interrupting frequency oscillation produced by the generator I is detected by a double-diode tube 2.
  • the detected alternating potential is applied to the choke coil 3 placed in the plate circuit of the magnetron tube 4 and in such manner that the negative pole of the detected potential lies at the anode side of the choke 3.
  • the curve shape of the interrupting frequency potential at the anode of the magnetron tube 4 corresponds then to the curve 0 in Fig. 1.
  • the received signals detected by the magnetron tube are applied to the amplifier 6 across the transformer 5 and can be heard at the telephone or loudspeaker 1.
  • I employed a direct current plate potential source of about 200 volts.
  • the superposed alternating potential as derived from the low frequency generator I was of approximately 20 volts.
  • the magnetron discharge tube oscillated to produce waves of the order of 20 centimeters in length and the frequency of the generator I was of the order of 6 kilocycles.
  • the frequencies could be adjusted so that when the magnetron produced 50 centimeter waves it was found preferable to employ an interrupting frequency generator which gave a frequency of 3 kilocycles. It was found that the sensitivity could be increased very decidedly as compared with an equivalent receiver the interrupting frequency of which had a sinusoidal characteristic.
  • the receiving tube is a magnetron tube or braking field tube.
  • a discharge tube having a cathode and two anodes is activated by a direct current potential in its cathode-anode circuit and wherein signal potentials are applied through a Lecher wire system to said anodes
  • the method of shaping the wave of an interrupting frequency potential to be superposed on said direct current potential which comprises introducing inductive reactance in said cathode-anode circuit, and impressing a rectified component of said interrupting frequency potential across the reactive portion of said circuit, said rectified component being poled in opposition to said direct current potential and serving to produce an anode supply current having sharp peaks.
  • a superregenerative receiving system com prising an electron discharge tube having a cathode and two anodes and circuits connected thereto for producing ultra-high frequency oscillations, an antenna system for collecting control frequency energy and feeding the same into said circuits, a direct current potential source for actuating said tube, an interrupting frequency generator, means for rectifying and shaping the output waves from said generator, means for superposing said waves on the potential from said direct current source, thereby to deliver sharply peaked positive impulses to the anodes of said tube and to periodically interrupt the ultrahigh frequency oscillations therein, and means responsive to an audiofrequency signal component derived from the circuits of said tube.
  • a superregenerative receiving system having an ultra-high frequency circuit arrangement including an oscillation generating electron dischargetubasaid tube having a plurality of electrodes including at least a cathode and two anodes, a Lecher wire system connected to said anodes, a direct current source connected negatively to said cathode and positively to said anodes, a utilization device in circuit between said cathode and said Lecher wire system, and means including a low frequency generator and a full wave rectifier actuated thereby for superimposing a quenching frequency potential on the constant potential applied across said tube electrodes by said direct current source, the last said means being operative to produce an anode supply current having sharp peaks and relatively long quenching periods.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Microwave Tubes (AREA)
US289335A 1938-08-28 1939-08-10 Superregenerative receiver Expired - Lifetime US2230108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET50907D DE707651C (de) 1938-08-28 1938-08-28 Pendelfrequenzempfaenger

Publications (1)

Publication Number Publication Date
US2230108A true US2230108A (en) 1941-01-28

Family

ID=7991337

Family Applications (1)

Application Number Title Priority Date Filing Date
US289335A Expired - Lifetime US2230108A (en) 1938-08-28 1939-08-10 Superregenerative receiver

Country Status (3)

Country Link
US (1) US2230108A (de)
DE (1) DE707651C (de)
FR (1) FR859440A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415317A (en) * 1944-04-14 1947-02-04 Hazeltine Research Inc Superregenerative receiver
US2427781A (en) * 1943-02-25 1947-09-23 Rca Corp Magnetron and circuit
US2511086A (en) * 1946-04-06 1950-06-13 Philco Corp Superregenerative receiver
US2572707A (en) * 1939-09-19 1951-10-23 Csf Pulse generator
US2572907A (en) * 1946-04-06 1951-10-30 Philco Corp Superregenerative receiver
US2605398A (en) * 1945-05-16 1952-07-29 Everard M Williams Quenched oscillating detector
US2614216A (en) * 1949-09-08 1952-10-14 Philco Corp Superregenerative detector
US3849778A (en) * 1950-03-08 1974-11-19 Us Army Pulse doppler fuse

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2572707A (en) * 1939-09-19 1951-10-23 Csf Pulse generator
US2427781A (en) * 1943-02-25 1947-09-23 Rca Corp Magnetron and circuit
US2415317A (en) * 1944-04-14 1947-02-04 Hazeltine Research Inc Superregenerative receiver
US2605398A (en) * 1945-05-16 1952-07-29 Everard M Williams Quenched oscillating detector
US2511086A (en) * 1946-04-06 1950-06-13 Philco Corp Superregenerative receiver
US2572907A (en) * 1946-04-06 1951-10-30 Philco Corp Superregenerative receiver
US2614216A (en) * 1949-09-08 1952-10-14 Philco Corp Superregenerative detector
US3849778A (en) * 1950-03-08 1974-11-19 Us Army Pulse doppler fuse

Also Published As

Publication number Publication date
DE707651C (de) 1941-06-28
FR859440A (fr) 1940-12-18

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