GB549769A - Improvements in radio receivers - Google Patents

Improvements in radio receivers

Info

Publication number
GB549769A
GB549769A GB2754/41A GB275441A GB549769A GB 549769 A GB549769 A GB 549769A GB 2754/41 A GB2754/41 A GB 2754/41A GB 275441 A GB275441 A GB 275441A GB 549769 A GB549769 A GB 549769A
Authority
GB
United Kingdom
Prior art keywords
oscillator
voltage
scanning
tuning
lead
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
GB2754/41A
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.)
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 GB549769A publication Critical patent/GB549769A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/047—Automatic frequency control using an auxiliary signal, e.g. low frequency scanning of the locking range or superimposing a special signal on the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/22—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element in which an automatic frequency control circuit is brought into action after the scanning action has been stopped
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/30—Automatic scanning over a band of frequencies where the scanning is accomplished by mechanical means, e.g. by a motor

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

549,769. Wireless receiving apparatus. WHITE, S. Y. Feb. 28, 1941, No. 2754. Convention date, Feb. 29, 1940. [Class 40 (v)] A radio receiving system having a circuit tunable by a variable reactance employing a thermionic valve, is characterized in that for automatically and continuously tuning said circuit over a range of frequencies including a plurality of adjacent communication channels'said variable. reactance device is operated by potential' variations of a low frequency, a director device being arranged to render ineffective said potential variations in response to the reception of a carrier in one of said channels. Fig. 2 shows the invention applied to a superheterodyne receiver in which a part of the output from the I:F. amplifier is fed by lead 14 to a valve VT1 in the output of which are circuits TC1, TC2 tuned to frequencies on either side of the intermediate frequency so that the differential voltage from load resistors R1, R2 of diodes VT2 indicates both by sign and amplitude, departures from tuning. This voltage is fed by lead 11 to the grid of a valve VT4 arranged as a reactance in the circuit of a beat oscillator VT3 supplying. the mixer 3. and varies the oscillator frequency to correct departures from tuning. A low frequency scanning oscillator VT5, VT6 preferably of saw-tooth kind, also supplies to lead 11 a voltage which continuously sweeps the oscillator frequency over about 1 per cent of its range to facilitate finding a station. The scanning oscillator voltage is however small and is entirely swamped by the voltage from VT2 on receipt of a signal, and so the tuning remains fixed. On stoppage of the received carrier, however, the scanning is resumed. If desired, the scanning oscillator may be omitted, and a kind of random scanning. is performed by the variable noise component voltages from VT2. Specification 541,393 is referred to.
GB2754/41A 1940-02-29 1941-02-28 Improvements in radio receivers Expired GB549769A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US321377A US2287925A (en) 1940-02-29 1940-02-29 Radio receiver

Publications (1)

Publication Number Publication Date
GB549769A true GB549769A (en) 1942-12-07

Family

ID=23250364

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2754/41A Expired GB549769A (en) 1940-02-29 1941-02-28 Improvements in radio receivers

Country Status (5)

Country Link
US (1) US2287925A (en)
BE (1) BE442115A (en)
FR (1) FR882606A (en)
GB (1) GB549769A (en)
NL (1) NL63645C (en)

Families Citing this family (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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DE878971C (en) * 1941-08-16 1953-04-23 Philips Nv Overlay receiver with automatic frequency control
FR884674A (en) * 1941-09-23 1943-08-24 Materiel Telephonique Radio receivers
US2459846A (en) * 1942-04-09 1949-01-25 Int Standard Electric Corp Voltage control arrangement
US2474354A (en) * 1942-05-19 1949-06-28 Patelhold Patentverwertung Automatic frequency control circuits
US2462856A (en) * 1942-05-19 1949-03-01 Sperry Corp Transmitter and/or receiver circuits
US2453988A (en) * 1942-07-10 1948-11-16 Radio Patents Corp Automatic frequency control
US2442583A (en) * 1942-10-10 1948-06-01 Rca Corp Scanning receiving system
US2444151A (en) * 1942-11-16 1948-06-29 Rca Corp Scanning receiver for detecting signals of unknown frequency
US2422381A (en) * 1942-12-08 1947-06-17 Victor S Johnson Method of lining up unicontrolled tuned radio apparatus
US2452575A (en) * 1943-04-22 1948-11-02 Sperry Corp Automatic frequency control
US2434293A (en) * 1943-05-11 1948-01-13 Sperry Gyroscope Co Inc Frequency control of an oscillator of the velocity modulation type
US2514443A (en) * 1943-06-07 1950-07-11 Rca Corp Selectivity control system
US2502294A (en) * 1943-08-19 1950-03-28 Wallace Marcel Double sweep panoramic radio receiver
US2434294A (en) * 1943-10-22 1948-01-13 Sperry Gyroscope Co Inc Frequency control system
US2647994A (en) * 1943-12-04 1953-08-04 Us Navy Automatic frequency control in pulse transmission systems
US2572216A (en) * 1944-04-01 1951-10-23 Bell Telephone Labor Inc Signal receiving system
US2425013A (en) * 1944-04-07 1947-08-05 Sperry Gyroscope Co Inc Frequency control system
US2498932A (en) * 1944-08-18 1950-02-28 Panoramic Radio Corp High-frequency tuning circuit
US2470843A (en) * 1944-10-04 1949-05-24 Philco Corp Stop-on carrier tuner
US2486551A (en) * 1944-10-04 1949-11-01 Philco Corp Automatic tuning electric system
US2419984A (en) * 1944-10-19 1947-05-06 Philco Corp Wide-band superheterodyne receiver
US2427191A (en) * 1944-10-25 1947-09-09 Philco Corp Blanking control for radio beacon systems
US2469324A (en) * 1945-02-09 1949-05-03 Rca Corp Circuit tuner
US2499514A (en) * 1945-02-27 1950-03-07 Rca Corp Beat frequency sweep oscillator
US2455472A (en) * 1945-04-10 1948-12-07 Bell Telephone Labor Inc Method and system for electronically generating complex signals
US2686875A (en) * 1945-07-20 1954-08-17 Westinghouse Electric Corp Frequency control system
US2499584A (en) * 1945-10-15 1950-03-07 Belmont Radio Corp Signal-seeking tuner
US2702861A (en) * 1946-02-21 1955-02-22 Sidney A Wingate Wobbulator
US2588240A (en) * 1946-03-27 1952-03-04 Bell Telephone Labor Inc Pulsing circuit
US2700101A (en) * 1946-04-19 1955-01-18 Wallace Panoramic device
US2648063A (en) * 1946-08-01 1953-08-04 Us Navy Transceiver system
NL77668C (en) * 1947-01-27
US2560312A (en) * 1947-10-03 1951-07-10 Philco Corp Tuning aid for radio receivers
US2660511A (en) * 1947-10-24 1953-11-24 Nielsen A C Co Lockout and recycling device for an apparatus for determining the listening habits of wave signal receiver users
US2507525A (en) * 1948-02-06 1950-05-16 Marcel Wallace Panoramic system
US2653243A (en) * 1948-08-17 1953-09-22 Westinghouse Electric Corp Automatic tuning of resonant circuits
US2601384A (en) * 1948-11-03 1952-06-24 Rca Corp Electronic signal seeking receiver
BE491024A (en) * 1948-11-27
US2802943A (en) * 1949-07-16 1957-08-13 Rca Corp Automatic adjustment of frequency stabilization systems
US2553368A (en) * 1950-01-07 1951-05-15 Philco Corp Automatic frequency control for television receivers
US2692330A (en) * 1950-05-22 1954-10-19 Rca Corp Noise reduction arrangement
US2714662A (en) * 1950-05-29 1955-08-02 Rca Corp Frequency stabilization of microwave oscillations
US2714663A (en) * 1950-05-29 1955-08-02 Rca Corp Stabilization of microwave oscillations
US2729745A (en) * 1951-06-05 1956-01-03 Sperry Rand Corp Sweep arrangements for servo systems
US2757279A (en) * 1951-11-20 1956-07-31 Raytheon Mfg Co Two-way communication systems
BE519977A (en) * 1952-05-17
NL89589C (en) * 1952-05-17
US2838671A (en) * 1952-07-10 1958-06-10 Farnsworth Res Corp Automatic frequency control circuit
US2794910A (en) * 1952-08-19 1957-06-04 Philips Corp Automatic frequency stabilizing circuit
NL92231C (en) * 1952-11-17
US2903648A (en) * 1953-08-31 1959-09-08 Raymond W Bonner Electrical audio range sweep oscillator
US2891105A (en) * 1953-09-23 1959-06-16 Rca Corp Automatic frequency control apparatus
US2777064A (en) * 1953-12-11 1957-01-08 Harris A Robinson Frequency control system
US2882391A (en) * 1954-09-07 1959-04-14 Gen Motors Corp Electric radio tuner
US2901597A (en) * 1955-07-19 1959-08-25 Craig L Whitman Transmitter frequency control
US2833923A (en) * 1955-10-13 1958-05-06 Gen Electric Hunting a. f. c. system
US2837646A (en) * 1955-10-24 1958-06-03 Hughes Aircraft Co Coherent detector circuit
US2956239A (en) * 1956-09-22 1960-10-11 Philips Corp Phase lock system
US2923815A (en) * 1956-12-12 1960-02-02 Cgs Lab Inc Remote tuning of oscillator via duplex conductor
US2924783A (en) * 1956-12-27 1960-02-09 Itt Wide band automatic frequency control systems
US3076151A (en) * 1957-03-15 1963-01-29 Gen Electric Afc with search sweep control
US3000006A (en) * 1957-03-20 1961-09-12 Melpar Inc Mixed-base data transmission
US2930905A (en) * 1957-07-30 1960-03-29 Eugene S Mcvey Relaxation oscillator and integrator
US3156867A (en) * 1960-09-19 1964-11-10 James Scott And Company Electr Electric signal spectrum analysers including automatic frequency control
NL269766A (en) * 1960-09-30
US3155919A (en) * 1961-01-03 1964-11-03 Collins Radio Co A. f. c. spectrum lock-in circuit
US3227963A (en) * 1962-03-19 1966-01-04 Beckman Instruments Inc Digital frequency synthesizer having a plurality of cascaded phase-locked digit selector stages
US3208005A (en) * 1963-03-26 1965-09-21 Guttman Julius Multichannel frequency synthesizer
US3218571A (en) * 1963-07-24 1965-11-16 Avco Corp Electronic servo controlled automatic frequency scanning system
US3383625A (en) * 1966-10-04 1968-05-14 Western Electric Co System for generating a smoothly and continuously varying signal having a variable frequency
US4307465A (en) * 1979-10-15 1981-12-22 Gte Laboratories Incorporated Digital communications receiver

Also Published As

Publication number Publication date
FR882606A (en) 1943-06-09
BE442115A (en)
NL63645C (en)
US2287925A (en) 1942-06-30

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