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GB547737A - Improvements in or relating to radio receivers - Google Patents

Improvements in or relating to radio receivers

Info

Publication number
GB547737A
GB547737A GB1633/41A GB163341A GB547737A GB 547737 A GB547737 A GB 547737A GB 1633/41 A GB1633/41 A GB 1633/41A GB 163341 A GB163341 A GB 163341A GB 547737 A GB547737 A GB 547737A
Authority
GB
United Kingdom
Prior art keywords
reception
switch
modulated signals
intermediate frequency
local oscillator
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
GB1633/41A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1633/41A priority Critical patent/GB547737A/en
Priority to US432589A priority patent/US2314785A/en
Publication of GB547737A publication Critical patent/GB547737A/en
Priority to FR931748D priority patent/FR931748A/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
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/10—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 different pairs of electrodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • H04L27/063—Superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

547,737. Superheterodyne circuits for wireless reception. STANDARD TELEPHONES & CABLES, Ltd., and HOLLAND, J. D. Feb. 7, 1941, No. 1633. [Class 40 (v)] In a superheterodyne receiver employing automatic gain control a separate electric path is provided after the controlled intermediate frequency amplifier into which local beating oscillations are injected for heterodyne reception. This path is separate from that used for receiving modulated signals. The Figure shows a triodehexode local oscillator and mixing valve lightly coupled to the output of the preceding intermediate frequency amplifier. The output circuit L3 C1 may be tuned to the beat frequency and a switch S1 associated with the volume control of the output stage be provided to change over to the reception of modulated signals, in which case the local oscillator is rendered inoperative by the switch S2.
GB1633/41A 1941-02-07 1941-02-07 Improvements in or relating to radio receivers Expired GB547737A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1633/41A GB547737A (en) 1941-02-07 1941-02-07 Improvements in or relating to radio receivers
US432589A US2314785A (en) 1941-02-07 1942-02-27 Radio receiver
FR931748D FR931748A (en) 1941-02-07 1946-08-01 Improvements in the reception of signals and CW

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1633/41A GB547737A (en) 1941-02-07 1941-02-07 Improvements in or relating to radio receivers

Publications (1)

Publication Number Publication Date
GB547737A true GB547737A (en) 1942-09-09

Family

ID=9725316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1633/41A Expired GB547737A (en) 1941-02-07 1941-02-07 Improvements in or relating to radio receivers

Country Status (3)

Country Link
US (1) US2314785A (en)
FR (1) FR931748A (en)
GB (1) GB547737A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL66625C (en) * 1944-11-03
US2593349A (en) * 1947-11-01 1952-04-15 Rca Corp Beat frequency oscillator for receivers
US2726327A (en) * 1953-01-27 1955-12-06 Raytheon Mfg Co Mixer circuits
US3018372A (en) * 1958-02-17 1962-01-23 Sarkes Tarzian High frequency tuner

Also Published As

Publication number Publication date
FR931748A (en) 1948-03-02
US2314785A (en) 1943-03-23

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