US2152336A - Method and device for remote tuning of radio receiving apparatus - Google Patents

Method and device for remote tuning of radio receiving apparatus Download PDF

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Publication number
US2152336A
US2152336A US147681A US14768137A US2152336A US 2152336 A US2152336 A US 2152336A US 147681 A US147681 A US 147681A US 14768137 A US14768137 A US 14768137A US 2152336 A US2152336 A US 2152336A
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US
United States
Prior art keywords
frequency
tuning
oscillations
receiving apparatus
radio receiving
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
US147681A
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English (en)
Inventor
Carel Jan Van Loon
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.)
Koninklijke Philips NV
Original Assignee
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
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
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Publication of US2152336A publication Critical patent/US2152336A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03J7/16—Automatic frequency control where the frequency control is accomplished by mechanical means, e.g. by a motor

Definitions

  • the intermediate-frequency amplifier is coupled with a device sensitive to frequency which controls a motor which is coupled with the shaft of the tuning members so that the motor is actuated when the carrier-wave frequency which is operative in the intermediate-frequency amplifier differs from the frequency to which the intermediate-frequency amplier is tuned, namely in such manner that correct tuning is obtained whereupon the motor is switched-oi or uncoupled again.
  • the invention relates to a method and a device for the remote tuning of such a receiving apparatus.
  • the automatic tuning device With a proper choice of the amplitude the automatic tuning device is set into operation. It remains in operation as long as the oscillations are sup-plied with the result that the tuning of the apparatus follows the frequency of the oscillations supplied.
  • the tuning members may thus be adjusted over a region of any desired extension.
  • 2 denotes a high-frequency amplifier to which are supplied the oscillations intercepted by an aerial l. After amplification these oscillations are combined with oscillations generated by a local oscillator il and rectied in a device 3.
  • the intermediate-frequency oscillation is amplified and supplied to a device 5 which (Cl. Z50-40) comprises asecond detector aswell as a low-frequency amplier which has connected to it a load 6, e. g., a loudspeaker.
  • the high-frequency amplifier and the local oscillator comprise members (sho-wn as variable condensers)v by means of 5- which the apparatus may be tuned.
  • a device l which comprises a device known per se which responds when the frequency deviates from a given value, and thus causes a motor 8 (which may be like that shown in U. S. Patent 1,794,932) to rotate in such dependence on the direction of the deviations that the correct tuning is re-established.
  • the motor is mechanically coupled for this purpose with the tuning members.
  • the apparatus is tuned 20 by hand by adjusting the members 2 and 4, the motor being switched-ofi or uncoupled.V Once the tuning is effected, the device for automatic tuning ensures that the correct tuning is maintained independently of any frequency variations of the local oscillator and of the station received.
  • a locally generated oscillation whose frequency at rst approximately corresponds to that of the station received and which is then slowly altered continuously.
  • the tuning of the apparatus follows the frequency of the signal supplied owing tothe actuation of the automatic tuning device.
  • the supply is interrupted whereupon further the tuning to this station is automatically maintained.
  • the generator intended for the remote tuning is denoted by 9.
  • the oscillations are preferably supplied through the intermediary of a transmission line. It is essential that at the point where the oscillation is supplied the amplitude of this oscillation should be larger than that of the 4,5 signal present-at this point, which may be easily achieved.
  • the normal reception via the aerial may be interrupted, for example by means of a device by which the aerial is short-circuited or disconnected.
  • the local oscillations instead of being supplied to the input circuit of the high-frequency amplifying tube, are preferably supplied, to a subsequent circuit in order to avoid radiation via theaerial.
  • the local oscillator 9 may 55 have a scale which is calibrated as to wave-length or frequency and which may indicate, in addition, the stations.
  • the method of tuning the radio receiver from one point of a frequency band to another point thereof which consists in generating oscillations of a frequency approximately equal to the frequency to which the radio receiver is tuned but of substantially stronger amplitude than any normally received signal from a distant transmitter, and applying the generated oscillations to the receiver, continuously varying the frequency of the generated oscillations while the generated oscillations are applied to the receiver, the variations Y in the frequency of the generated oscillations being made at a rate such that the tuning instrumentality of the' radio receiver can follow the changes in frequency of the generated oscillations and thereby operate the tuning means in accordance therewith, and discontinuing the application of the generated oscillations to the radio receiver when the frequency of the generated oscillations is approximately the same as the frequency to which it is desired to tune the

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)
US147681A 1936-07-27 1937-06-11 Method and device for remote tuning of radio receiving apparatus Expired - Lifetime US2152336A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201133X 1936-07-27

Publications (1)

Publication Number Publication Date
US2152336A true US2152336A (en) 1939-03-28

Family

ID=5764688

Family Applications (1)

Application Number Title Priority Date Filing Date
US147681A Expired - Lifetime US2152336A (en) 1936-07-27 1937-06-11 Method and device for remote tuning of radio receiving apparatus

Country Status (5)

Country Link
US (1) US2152336A (en, 2012)
CH (1) CH201133A (en, 2012)
FR (1) FR824814A (en, 2012)
GB (1) GB475643A (en, 2012)
NL (1) NL48336C (en, 2012)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2462856A (en) * 1942-05-19 1949-03-01 Sperry Corp Transmitter and/or receiver circuits
US2472957A (en) * 1944-10-04 1949-06-14 Colonial Radio Corp Tuning control system for signal seeking receivers
US2478977A (en) * 1944-11-13 1949-08-16 Colonial Radio Corp Signal seeking receiver for frequency modulated signals
US2490844A (en) * 1940-05-16 1949-12-13 Helen S Sorensen Radio remote-control aircraft system
US2541329A (en) * 1943-07-09 1951-02-13 Hartford Nat Bank & Trust Co Apparatus for the remote control of a tunable radio frequency converting system
US2581594A (en) * 1948-12-30 1952-01-08 Rca Corp Wide-range high stability frequency generating system
US2726326A (en) * 1942-10-29 1955-12-06 Sylvania Electric Prod Electrical automatic tuning unit
US2818506A (en) * 1954-05-18 1957-12-31 Merles Antoine Jean Apparatus for the automatic tuning of radioelectric transmitters or receivers
US2876345A (en) * 1958-01-07 1959-03-03 Motorola Inc Remote oscillator trunk receiver
US2923815A (en) * 1956-12-12 1960-02-02 Cgs Lab Inc Remote tuning of oscillator via duplex conductor
US3106681A (en) * 1961-03-06 1963-10-08 Collins Radio Co R. f. amplifier automatic frequency tuning
DE1221317B (de) * 1963-02-07 1966-07-21 Gen Dynamics Corp Schaltung zur selbsttaetigen Ausregelung von Frequenzschwankungen eines HF-Schwingkreises

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490844A (en) * 1940-05-16 1949-12-13 Helen S Sorensen Radio remote-control aircraft system
US2462856A (en) * 1942-05-19 1949-03-01 Sperry Corp Transmitter and/or receiver circuits
US2726326A (en) * 1942-10-29 1955-12-06 Sylvania Electric Prod Electrical automatic tuning unit
US2541329A (en) * 1943-07-09 1951-02-13 Hartford Nat Bank & Trust Co Apparatus for the remote control of a tunable radio frequency converting system
US2472957A (en) * 1944-10-04 1949-06-14 Colonial Radio Corp Tuning control system for signal seeking receivers
US2478977A (en) * 1944-11-13 1949-08-16 Colonial Radio Corp Signal seeking receiver for frequency modulated signals
US2581594A (en) * 1948-12-30 1952-01-08 Rca Corp Wide-range high stability frequency generating system
US2818506A (en) * 1954-05-18 1957-12-31 Merles Antoine Jean Apparatus for the automatic tuning of radioelectric transmitters or receivers
US2923815A (en) * 1956-12-12 1960-02-02 Cgs Lab Inc Remote tuning of oscillator via duplex conductor
US2876345A (en) * 1958-01-07 1959-03-03 Motorola Inc Remote oscillator trunk receiver
US3106681A (en) * 1961-03-06 1963-10-08 Collins Radio Co R. f. amplifier automatic frequency tuning
DE1221317B (de) * 1963-02-07 1966-07-21 Gen Dynamics Corp Schaltung zur selbsttaetigen Ausregelung von Frequenzschwankungen eines HF-Schwingkreises

Also Published As

Publication number Publication date
CH201133A (de) 1938-11-15
NL48336C (en, 2012)
GB475643A (en) 1937-11-23
FR824814A (fr) 1938-02-17

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