US2591982A - Superheterodyne receiver for very short waves - Google Patents

Superheterodyne receiver for very short waves Download PDF

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Publication number
US2591982A
US2591982A US685200A US68520046A US2591982A US 2591982 A US2591982 A US 2591982A US 685200 A US685200 A US 685200A US 68520046 A US68520046 A US 68520046A US 2591982 A US2591982 A US 2591982A
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US
United States
Prior art keywords
lecher
wave
oscillations
antenna
superheterodyne receiver
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
US685200A
Other languages
English (en)
Inventor
Adelbert Van Weel
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
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from NL102359A external-priority patent/NL60852C/xx
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2591982A publication Critical patent/US2591982A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H03D7/14—Balanced arrangements
    • H03D7/1408—Balanced arrangements with diodes
    • 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
    • H03D7/14—Balanced arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H03H2/008—Receiver or amplifier input circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/06—Answer-back mechanisms or circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
    • H04L15/04—Apparatus or circuits at the transmitting end
    • H04L15/22—Apparatus or circuits for sending one or a restricted number of signals, e.g. distress signals

Definitions

  • 2,505,251 dated April 25, 1950 discloses a superheterodyne receiver for very short waves, in which the local oscillations are supplied in the same phase and the incoming oscillations through a tunable Lecher wire system in push-pull to the mixing tube, and in which the oscillatory system formed by the two Lecher wires jointly with respect to the surroundings has such an electrical length that at the points, where the antenna is connected to the Lecher wire sys-' tem, a potential node appears in regard to the local oscillations.
  • the present invention has for its object to provide an improved circuit arrangement, by which the emission is still further reduced.
  • the antenna is connected to the said points of the Lecher wire system through a filter which transmits the incoming oscillations but stops the local oscillations.
  • the said filter is preferably designed in such a manner that the antenna is connected to the said points of the Lecher wire system through a transmission line to which a side-branch, which is tuned to the incoming oscillations, is connected at an electric distance of a quarter of a wavelength of the local oscillations from the said points, of which side branch the two wires jointly constitute an oscillatory system with respect to the surroundings, which has such an electrical length as to produce a potential node in regard to the local oscillations at the junction to the transmission line.
  • the oscillations picked up by a dipole antenna I, 2 are supplied to a pair of conductors 3, 4 forming part of a Lecher :wire system which is tuned to the frequency of the incoming oscillations through the intermediary of a shortcircuit bridge 5.
  • the antenna. I, 2 is connected to such points I4, I5 of the Lecher wire system as to secure correct accommodation to the mixing 2 tube.
  • the conductors 3 and 4 are connected to the anodes '6 and I of a double diode 8.
  • the cathode 9 of the tube 8 is connected to earth through a source of potential I 0 supplying the 10- cal oscillations. Consequently the incoming oscillations are supplied in push-pull connection and the local oscillations in the same phase to the mixing tube 8. l
  • the intermediate frequency oscillations can now be taken in push-pull connection.
  • a resonant circuit tuned to the intermediate fre quency if required in series with one or more high frequency chokes, may be interposed between the anodes of the diode.
  • the two Lecher wires 3 and 4 jointly carry, with respect to earth, a voltage having the frequency of the local oscillations, due to which the antenna I, 2 might emit the local oscillations.
  • the Lecher wires 3 and 4 are lengthened by parts II and I2 whose ends are connected through an earthed short-circuit bridge I 3, the said extension being chosen in such a manner that the stationary wave having the frequency of the local oscillations, which appears,
  • I2 in the wires 3, II and 4, I2 jointly, has a potential node at the end I3 and in addition a potential node at the junctions I4, I5 to the antenna I, 2.
  • a concentrated inductance or capacity may be provided between the short-circuit bridge *5 and earth. Under these conditions the emission of the local oscillations by the antenna I, 2 is prevented for the greater part but not entirely.
  • a further suppression of this emission is ensured by interposing a. filter between the antenna I, 2 and points I4, I5, by which filter the incoming oscillations are transmitted but the local oscillations are suppressed.
  • the antenna I, 2 is connected to points I 4, I5 through a transmission line I6, I! to which a side branch 20, 2
  • the electrical distance of points I4, I5 from points I8, I9 corresponds with a quarter wavelength of the local oscillations.
  • is tuned to the incoming oscillations through a short-circuit bridge 22.
  • the conductors 20 and 2I are lengthened by parts 23, 24 whose ends are connected through an earthed short-circuit bridge 25 and whose length is chosen in such a manner that the oscillatory system formed by the conductors 20, 23 and 2
  • a concentrated inductance or capacity may be provided between the short-circuit bridge 22 and earth.
  • the said parts I6 to 25 jointly constitute a very effective filter by which the oscillator frequency is practically entirely suppressed.
  • a circuit arrangement for mixing a first wave and a second wave to produce an intermediate frequency wave comprising a pair of mixing elements, means to generate said first wave and to apply said first wave to said mixing elements in inphase relationship, a first Lecher system having an open end thereof coupled to said mixing elements in push-pull relationship and having a closed end to produce on said first Lecher system a first voltage node of said first wave at said closed end of said first Lecher-system and a second voltage node of said first wave at a point on said first Lecher system intermediate to said closed end and said mixing elements, first bridge means positioned intermediate to the closed end of said first Lecher-system and said mixing elements to tune said first Lecher-system to the frequency of said second wave, an antenna system to receive said second wave, a transmission line coupled between said antenna system and said point on said first Lecher-system, a second Lecher system having an open end thereof coupled to said transmission line at a point thereon an odd multiple quarter wave length of said first wave from said point on said first Lecher-system and having a closed
  • a circuit arrangement for mixing a first wave and a second wave to produce an intermediate frequency wave comprising a pair of mixing elements each having an anode electrode and having a common cathode, means to generate said first wave coupled between said cathode and 4 ground potential, a first Lecher-system having an open end thereof coupled to said anodes in push-pull relationship and having a closed end coupled to ground to produce on said first Lecher-system a first voltage node of said first wave at said closed end of said first Lecher-system and a second voltage node of said first wave at a point on said first Lecher-system intermediate to said closed end of said first Lecher-system and said anodes, first bridge means positioned intermediate to the closed end of said first Lecher-system and said anodes to tune said first Lecher-system to the frequency of said second wave, an antenna system to receive said second wave, a transmission line coupled between said point on said first Lecher-system and said antenna means, a second Lecher-system having an open end thereof coupled to said transmission line at a

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
US685200A 1941-07-30 1946-07-20 Superheterodyne receiver for very short waves Expired - Lifetime US2591982A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL102359A NL60852C (US06534493-20030318-C00166.png) 1941-07-30 1941-07-30
NL619747X 1943-07-26

Publications (1)

Publication Number Publication Date
US2591982A true US2591982A (en) 1952-04-08

Family

ID=26641551

Family Applications (1)

Application Number Title Priority Date Filing Date
US685200A Expired - Lifetime US2591982A (en) 1941-07-30 1946-07-20 Superheterodyne receiver for very short waves

Country Status (5)

Country Link
US (1) US2591982A (US06534493-20030318-C00166.png)
DE (1) DE912830C (US06534493-20030318-C00166.png)
FR (1) FR53730E (US06534493-20030318-C00166.png)
GB (1) GB619747A (US06534493-20030318-C00166.png)
NL (1) NL64724C (US06534493-20030318-C00166.png)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654836A (en) * 1952-04-24 1953-10-06 Rca Corp Converter circuit
US2772355A (en) * 1951-07-05 1956-11-27 Polytechnic Res & Dev Co Inc Wide range tuner
US2835796A (en) * 1954-02-09 1958-05-20 Bernard B King Television tuner with local oscillator variably coupled to mixer through tunable long lines
US3302852A (en) * 1965-05-20 1967-02-07 Waldorf Paper Prod Co Recessed end containers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973679C (de) * 1952-07-25 1960-04-28 Telefunken Gmbh Schaltungsanordnung zur Unterdruckung der Ausstrahlung der Oberwellen eines Oszillators eines UKW-Empfaengers

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1933669A (en) * 1931-10-19 1933-11-07 American Telephone & Telegraph Selective antenna circuits
US1980158A (en) * 1931-05-01 1934-11-06 Rca Corp Oscillatory circuit
US2106776A (en) * 1935-02-23 1938-02-01 Rca Corp Receiving system
US2211003A (en) * 1938-01-29 1940-08-13 Rca Corp Radio signaling system
US2227078A (en) * 1937-11-11 1940-12-31 Telefunken Gmbh Heterodyne receiver for ultrashort waves
US2238438A (en) * 1935-03-22 1941-04-15 Mackay Radio & Telegraph Co Electrical network
US2260844A (en) * 1940-03-12 1941-10-28 Gen Electric Ultra high frequency converter
US2382693A (en) * 1940-02-24 1945-08-14 Dallenbach Walter Oscillator-modulator circuit
US2441452A (en) * 1941-01-31 1948-05-11 Hartford Nat Bank & Trust Co Frequency changing circuits
US2453078A (en) * 1940-12-05 1948-11-02 Hartford Nat Bank & Trust Co Device for wave length transformation of very short waves
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1980158A (en) * 1931-05-01 1934-11-06 Rca Corp Oscillatory circuit
US1933669A (en) * 1931-10-19 1933-11-07 American Telephone & Telegraph Selective antenna circuits
US2106776A (en) * 1935-02-23 1938-02-01 Rca Corp Receiving system
US2238438A (en) * 1935-03-22 1941-04-15 Mackay Radio & Telegraph Co Electrical network
US2227078A (en) * 1937-11-11 1940-12-31 Telefunken Gmbh Heterodyne receiver for ultrashort waves
US2211003A (en) * 1938-01-29 1940-08-13 Rca Corp Radio signaling system
US2382693A (en) * 1940-02-24 1945-08-14 Dallenbach Walter Oscillator-modulator circuit
US2260844A (en) * 1940-03-12 1941-10-28 Gen Electric Ultra high frequency converter
US2453078A (en) * 1940-12-05 1948-11-02 Hartford Nat Bank & Trust Co Device for wave length transformation of very short waves
US2441452A (en) * 1941-01-31 1948-05-11 Hartford Nat Bank & Trust Co Frequency changing circuits
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2772355A (en) * 1951-07-05 1956-11-27 Polytechnic Res & Dev Co Inc Wide range tuner
US2654836A (en) * 1952-04-24 1953-10-06 Rca Corp Converter circuit
US2835796A (en) * 1954-02-09 1958-05-20 Bernard B King Television tuner with local oscillator variably coupled to mixer through tunable long lines
US3302852A (en) * 1965-05-20 1967-02-07 Waldorf Paper Prod Co Recessed end containers

Also Published As

Publication number Publication date
DE912830C (de) 1954-06-03
GB619747A (en) 1949-03-14
NL64724C (US06534493-20030318-C00166.png) 1949-11-15
FR53730E (fr) 1946-07-29

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