US2712597A - Superheterodyne radio receiver - Google Patents

Superheterodyne radio receiver Download PDF

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Publication number
US2712597A
US2712597A US148728A US14872850A US2712597A US 2712597 A US2712597 A US 2712597A US 148728 A US148728 A US 148728A US 14872850 A US14872850 A US 14872850A US 2712597 A US2712597 A US 2712597A
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United States
Prior art keywords
grid
control
circuit
frequency
anode
Prior art date
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Expired - Lifetime
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US148728A
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English (en)
Inventor
Dammers Bernhardus Gerhardus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
    • 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
    • H03D7/08—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 the same two electrodes

Definitions

  • the principal object of the present invention is to provide in a simple manner, in a circuit-arrangement as described in the preamble, manual or automatic control means to vary the strength of the intermediate-frequency oscillations in the anode circuit, without appreciably affecting the oscillator, and ensuring a satisfactory conversion conductance and signal-to-noise ratio.
  • both the signal oscillation and the local oscillation are supplied to the grid nearest the cathode.
  • the series-combination of an impedance, from which the intermediate-frequency oscillations are derived, and the feedback impedance is interposed between the anode and the cathode.
  • the junction of these impedances is connected to the second central grid, which grid has a positive potential withrespect to the cathode.
  • a control voltage is applied to the third grid.
  • the arrangement according to the present invention has the advantage that a tube comprising only three grids is sucient.
  • Figure l is a schematic diagram of a circuit-arrangement in accordance with the invention.
  • FIG. 2 is a schematic diagram of another circuit# arrangement in accordance with the invention.
  • a mixing circuit-arrangement according to the invention.
  • an inductance 1 in the antenna circuit is coupled with the inductance of a parallel resonant circuit 2 which is tuned to the input signal frequency.
  • the signal oscillations arel supplied, through a condenser 3, lters 4, 5 and a tapped inductance 6, to a first control-grid 9 of a pentode tube 7.
  • Tube 7 also comprises a cathode 8, a screen grid 10, a suppressor grid 11 and an anode 12.
  • anode circuit comprises a parallel resonant circuit 15 which is tuned to the intermediate-frequency and coupled with a circuit 16 which is also tuned to this frequency. From thelatter circuit the intermediate-frequency oscillations are taken and supplied to an intermediate-frequency ampliiier (not shown).
  • a parallel resonant circuit 17 tuned vto the local oscillation frequency is connected between the circuit 15 and a positive terminal of a source of supply voltage.
  • the inductance of the circuit 17 is coupled with the inductance 6, the center tap of which is connected to the filter 5.
  • Filters 4 and 5 serve to isolate the antenna circuit 2 from the intermediate-frequency and the oscillator frequency circuits.
  • the lower end of the coil gijs grounded through a parallel-combination of a condenser 18 anda resistance 22.
  • the cathode 8 is grounded through a biasing-resistor 23 which is suitably by-passed by a capacitor 13.
  • the screen grid 10 is connected, through a condenser 19, to the junction of resonant circuits 1S and 1.7.
  • Screen grid 10 is also connected through a resistance 20 to a positive terminal of the source of supply voltage. Resistance 20 may conveniently be replaced by an inductor.
  • a resistance 14, which serves as a leakage resistance for the first control-grid, is connected between the terminal of iilter 4 remote from ilter 5 and ground. VResistance 20 maybe dispensed with if resistance 22 is provided.
  • the suppressor grid 11 serves as a control-grid and is connected for this purpose to a voltage source (not shown) adapted to be controlled manually or automatically in accordance with the signal strength. This voltage source may be, for instance, a conventional A-V-C source.
  • the circuit-arrangement operates as follows: Owing to the coupling between resonant circuit 17 and coil 6, local oscillations are produced in the latter. These local oscillations are applied between the cathode 8 and the rst control-grid 9 of the tube. The input oscillations from the antenna are supplied to a tap on coil 6 at which no local oscillation voltage is developed, so that substantially no local oscillation voltage appears across the antenna circuit. Isolation of the antenna circuit is further improved by lters 4 and 5. n
  • the tapping point of coil 6 is so chosen that no local oscillations areV supplied to the antenna circuit. This tapping point will, as a rule, have to be at the center of the coil andthe capacity of the condenser have to be approximately equal to the capacity between the cathode and the iirst control-grid of the tube.
  • the resistance 22 will haverto be approximately equal to the input resistance of the tube.
  • Fig. 2 shows a modiiied embodiment ⁇ of the invention, which diiers from the arrangement shown in Fig. l in that the oscillator circuit 17 is connected between the cathode and ground.
  • the screen ⁇ grid 10 is directly connected to the positive terminal of the supply and an impedance 21 is connected between the lower ⁇ end of inductance 6 and ground to balance lthe inductance 6 relatively to the antenna circuit in such manner that the latter does not radiate local oscillations.
  • a mixing circuit arrangement for mixing a rst wave and a second wave to produce an intermediate frequency wave comprising an electron discharge tube hav- Iingrin successive dispositions a cathode, a first control grid, avscreen grid, a secondV control grid and an anode, a iirst impedance network tuned to the frequency of said intermediate frequency wave and coupled between said anode and said cathode, a second impedance network interposed between said first impedance network and said cathode, means to couple the end of said first impedance network remote from said anode to said screen grid, means to couple said second impedance network to said irst control grid in regenerative relationship at the frequency of said second wave, means to apply said first wave to said rst control grid, and means to apply a control voltage to said second control grid to vary the current-dist tribution between said screen grid and said anode.
  • a mixing circuit arrangement for mixing a rst wave-and a second wave to produce an intermediate frequency wave comprising an electron discharge tube having in successive dispositions a cathode, a first control grid, a screen grid, a second control grid and an anode, a first impedance network tuned to the frequency of said intermediate frequency wave and coupled between said anode and said cathode, a second impedance network tuned to the frequency of said second wave interposed 18 will i between said first impedance network and said cathode, means to couple the end of said first impedance network remote from said anode to said screen grid, an inductive element inductively coupled to said second impedance network, means to couple said inductive element to said first control grid in regenerative relationship at the frek quency of said second wave, means to apply Ysaid first wave to said first control grid, and means to apply a control voltage to said second control grid to vary theicurrent distribution between said screen grid and said anode.
  • a mixing circuit arrangement for mixing a rst wave and a second wave to produce an intermediate frequency wave comprising an electron discharge tube having a cathode, a first control grid, a screen grid, a second control grid and an anode, a first impedance network tuned to the frequency of said intermediate frequency wave and coupled between Vsaid anode and said cathode, a second impedance network tuned to the frequency of said second wave interposed between said iirst impedance network and said cathode, means to capacitively couple the end ofsaid lirst impedance network remote from said l anode to said screen grid, a tapped inductive element inductively couplied to said second impedance network and having one endv thereof coupled to said -irst control y grid to apply said secondwave to said control grid-iu positive ⁇ feed-back relationship, a third impedance net- Ywork intercoupling the other end of said inductive ele- ⁇ ment and ground potential, means to
  • a-screen grid a second control grid and an anode, a first impedance network tuned to the frequency of said intermediate frequency wave and coupled betweensaid anode and ground, a second impedance network tuned to the frequency of Ysaid second wave and connected between said cathode and ground, means to connect the end'of said first impedance network remote from said anode to said screen grid, a tapped inductive element inductively coupled to said second Vimpedance network and having one end thereof connected to said first control grid in regenerative relationship at the vfrequency of said second wave, a balancing impedance ⁇ connecting the other end of said element to ground, means to apply said rst wave between the tap of. said element and ground, and means to apply a control voltage to said second control grid to vary the current distribution between said screen grid and said anode.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Superheterodyne Receivers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US148728A 1949-02-16 1950-02-15 Superheterodyne radio receiver Expired - Lifetime US2712597A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL279129X 1949-02-16

Publications (1)

Publication Number Publication Date
US2712597A true US2712597A (en) 1955-07-05

Family

ID=19782232

Family Applications (1)

Application Number Title Priority Date Filing Date
US148728A Expired - Lifetime US2712597A (en) 1949-02-16 1950-02-15 Superheterodyne radio receiver

Country Status (7)

Country Link
US (1) US2712597A (en(2012))
BE (1) BE493900A (en(2012))
CH (1) CH279129A (en(2012))
DE (1) DE854233C (en(2012))
FR (1) FR1012816A (en(2012))
GB (1) GB693902A (en(2012))
NL (1) NL83682C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2980795A (en) * 1959-12-09 1961-04-18 Hazeltine Research Inc Autodyne converter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967593C (de) * 1953-12-25 1957-11-28 Max Braun Fa Additive Trioden-Mischstufe fuer sehr hohe Frequenzen

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2022085A (en) * 1931-12-14 1935-11-26 Hazeltine Corp Radioreceiver
US2053414A (en) * 1932-02-12 1936-09-08 Rca Corp Heterodyne receiving system
US2153778A (en) * 1933-04-27 1939-04-11 Rca Corp Circuit arrangement
US2347826A (en) * 1941-10-21 1944-05-02 Lorain County Radio Corp High frequency switching means
US2409577A (en) * 1943-12-03 1946-10-15 Rca Corp Synchronized blocking oscillator
US2512399A (en) * 1947-09-20 1950-06-20 Hartford Nat Bank & Trust Co Mixing circuit
US2516272A (en) * 1945-12-07 1950-07-25 Philco Corp Frequency conversion system
US2582683A (en) * 1949-02-16 1952-01-15 Hartford Nat Bank & Trust Co Superheterodyne radio receiver

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673718A (fr) * 1928-08-25 1930-01-18 Radiomodulation par les lampes à faible capacité intérieure
US2034513A (en) * 1933-04-01 1936-03-17 Rca Corp Combined detector oscillator circuit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2022085A (en) * 1931-12-14 1935-11-26 Hazeltine Corp Radioreceiver
US2053414A (en) * 1932-02-12 1936-09-08 Rca Corp Heterodyne receiving system
US2153778A (en) * 1933-04-27 1939-04-11 Rca Corp Circuit arrangement
US2347826A (en) * 1941-10-21 1944-05-02 Lorain County Radio Corp High frequency switching means
US2409577A (en) * 1943-12-03 1946-10-15 Rca Corp Synchronized blocking oscillator
US2516272A (en) * 1945-12-07 1950-07-25 Philco Corp Frequency conversion system
US2512399A (en) * 1947-09-20 1950-06-20 Hartford Nat Bank & Trust Co Mixing circuit
US2582683A (en) * 1949-02-16 1952-01-15 Hartford Nat Bank & Trust Co Superheterodyne radio receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2980795A (en) * 1959-12-09 1961-04-18 Hazeltine Research Inc Autodyne converter

Also Published As

Publication number Publication date
BE493900A (en(2012))
CH279129A (de) 1951-11-15
FR1012816A (fr) 1952-07-17
DE854233C (de) 1952-11-04
NL83682C (en(2012))
GB693902A (en) 1953-07-08

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