GB619747A - Improvements in or relating to superheterodyne receivers for very short waves - Google Patents

Improvements in or relating to superheterodyne receivers for very short waves

Info

Publication number
GB619747A
GB619747A GB37814/46A GB3781446A GB619747A GB 619747 A GB619747 A GB 619747A GB 37814/46 A GB37814/46 A GB 37814/46A GB 3781446 A GB3781446 A GB 3781446A GB 619747 A GB619747 A GB 619747A
Authority
GB
United Kingdom
Prior art keywords
connexion
point
local oscillator
frequency
oscillator frequency
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
Application number
GB37814/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB619747A publication Critical patent/GB619747A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • 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)

Abstract

619,747. Radio receiving circuits. PHILIPS LAMPS, Ltd. Dec. 24, 1946, No. 37814. Convention date, July 26, 1943. Addition to 609,542. [Class 40 (v)] In a frequency-changing arrangement of the type described in the parent Specification in which local oscillations from the source 10 are applied in phase to the cathode 9 of the mixing valve, and received signals in push-pull to the anodes 6, 7 via a Lecher wire system 3, and radiation of the local oscillations is reduced by arranging the system constituted by the two Lecher wires 3 jointly relative to their surroundings of such dimensions that the point of connexion of the aerial 1 is a potential node for the local oscillator frequency, radiation is further reduced by the interposition in the aerial connexion of a transmission line 16 provided with a branched stub 20. The distance from the point of connexion 18 of the stub line 20 to the Lecher wires 3 is made a quarter-wavelength for the local oscillator frequency. The line 20 is terminated in an earthing bridge 25, its length being such as to produce a potential node for the local oscillator frequency at the point 18. Adjustment for the signal frequency is by means of a shortcircuiting bridge 24.
GB37814/46A 1941-07-30 1946-12-24 Improvements in or relating to superheterodyne receivers for very short waves Expired GB619747A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL102359A NL60852C (en) 1941-07-30 1941-07-30
NL619747X 1943-07-26

Publications (1)

Publication Number Publication Date
GB619747A true GB619747A (en) 1949-03-14

Family

ID=26641551

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37814/46A Expired GB619747A (en) 1941-07-30 1946-12-24 Improvements in or relating to superheterodyne receivers for very short waves

Country Status (5)

Country Link
US (1) US2591982A (en)
DE (1) DE912830C (en)
FR (1) FR53730E (en)
GB (1) GB619747A (en)
NL (1) NL64724C (en)

Families Citing this family (5)

* 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
DE973679C (en) * 1952-07-25 1960-04-28 Telefunken Gmbh Circuit arrangement for suppressing the emission of the harmonics of an oscillator of a VHF receiver
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

Family Cites Families (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
NL58874C (en) * 1938-01-29
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
NL58327C (en) * 1940-12-05
BE444311A (en) * 1941-01-31
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Also Published As

Publication number Publication date
FR53730E (en) 1946-07-29
NL64724C (en) 1949-11-15
DE912830C (en) 1954-06-03
US2591982A (en) 1952-04-08

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