GB530615A - Improvements in or relating to carrier wave receivers - Google Patents

Improvements in or relating to carrier wave receivers

Info

Publication number
GB530615A
GB530615A GB15608/40A GB1560840A GB530615A GB 530615 A GB530615 A GB 530615A GB 15608/40 A GB15608/40 A GB 15608/40A GB 1560840 A GB1560840 A GB 1560840A GB 530615 A GB530615 A GB 530615A
Authority
GB
United Kingdom
Prior art keywords
input
frequency
local oscillator
tuned
resonance curve
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
GB15608/40A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of GB530615A publication Critical patent/GB530615A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H04B1/1623—Supply circuits using tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
    • 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
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H03F3/52—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • 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
    • H04B1/16—Circuits
    • H04B1/1638—Special circuits to enhance selectivity of receivers not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)
  • Amplifiers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

530,615. Superheterodyne wireless receivers. KRAMOLIN, L. L. DE. May 24, 1939, No. 15608/40. Convention date, May 25, 1938. Divided out of 531,612. [Class 40 (v)] In a superheterodyne receiver of the single-span type a high frequency circuit has a multi-peaked resonance curve which is shifted through the frequency spectrum as the local oscillator frequency is varied. In this way the frequency range of the signal tuned circuit, which may be the input circuit is extended and the signal noise ratio is improved. As shown the input noise ratio is improved. As shown the input and local oscillator circuits are tuned by coils S1, S2 saturated by a magnet M as described in Specification 531,612 and the core of the input inductance may have a higher permeability than the core of the local oscillator inductance. Alternatively current- or voltagedependent tuning means as described in Specifications 449,240, 451,097, [Group XXXVI], 451,098, 455,190, 470,945, 473,384, 481,062, 490,058, 510,862, 510,941, 511,031, [Group XXXV], 513,626 and 517,966, [Group XXXV], may be used. The input coupling includes a low pass filter and connection is made to a tapping on the tuning coil S1 to produce a double humped resonance curve, and sufficient input selectivity may be obtained to allow the use of an intermediate frequency as low as 468 kc. An auxiliary adjusting capacity may be provided in the input to the frequency changer valve and the aerial may include rejector circuits tuned to the frequency of the local transmitters. Automatic volume control is provided to equalise variations in input amplitude as the received frequency moves progressively along the multi-peaked resonance curve and the wave-range may be subdivided into a plurality of smaller subranges with separate indicators in a remote control system as described in Specification 530,616, [Group XXXVI].
GB15608/40A 1938-05-25 1939-05-24 Improvements in or relating to carrier wave receivers Expired GB530615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE530615X 1938-05-25

Publications (1)

Publication Number Publication Date
GB530615A true GB530615A (en) 1940-12-16

Family

ID=6554592

Family Applications (2)

Application Number Title Priority Date Filing Date
GB15467/39A Expired GB531612A (en) 1938-05-25 1939-05-24 Radio apparatus or the like
GB15608/40A Expired GB530615A (en) 1938-05-25 1939-05-24 Improvements in or relating to carrier wave receivers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB15467/39A Expired GB531612A (en) 1938-05-25 1939-05-24 Radio apparatus or the like

Country Status (1)

Country Link
GB (2) GB531612A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989688A (en) * 1957-06-05 1961-06-20 Gen Motors Corp Saturation permeability tuned transistor radio
DE1616703B1 (en) * 1961-04-29 1969-09-04 Blaupunkt Werke Gmbh Radio receiver with transistors

Also Published As

Publication number Publication date
GB531612A (en) 1941-01-08

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