US2188498A - Remote control wave signal receiver - Google Patents

Remote control wave signal receiver Download PDF

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Publication number
US2188498A
US2188498A US236400A US23640038A US2188498A US 2188498 A US2188498 A US 2188498A US 236400 A US236400 A US 236400A US 23640038 A US23640038 A US 23640038A US 2188498 A US2188498 A US 2188498A
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United States
Prior art keywords
frequency
receiver
motor
source
control
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Expired - Lifetime
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US236400A
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English (en)
Inventor
Leslie F Curtis
John F Farrington
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BAE Systems Aerospace Inc
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Hazeltine Corp
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Priority to US236400A priority Critical patent/US2188498A/en
Priority to GB27767/39A priority patent/GB533136A/en
Priority to FR863060D priority patent/FR863060A/fr
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/248—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection using electromechanical means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/18—Control by auxiliary power
    • H03J1/20—Control by auxiliary power the auxiliary power being switched on as long as controlling current is switched on

Definitions

  • This invention relates generally'to remotely controlled wave-signal receivers and particularly to such receivers comprising a simplified remote-control arrangement.
  • Prior art remote-control systems comprising a follower arrangement have, however, the dis advantage of requiring additional conductors between the control station and the controlled unit, while it is desirable to control the receiver over the power-supply lines. Furthermore, in the prior art control arrangements in which a follower of some form is provided at the control station the follower is continuously adjusted by the tuning motor at the receiver, the energization of the tuning motor gradually decreasing as the follower approaches the point of balance so that the position at which the motor finally stops is not critically related to the setting of the control unit at the remote station.
  • a wave-signal receiver which may be vention, in a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carn'er frequencies, a tuning motor and tuning means for the receiver driven by the motor, there is provided a remote-control system comprising a control station remote from the motor and including a source of high-frequency oscillations of frequencies different from that of any of the signals to be received.
  • a manual control means for varying the frequency of the source, a frequencyadjustable frequency follower at the receiver external to the signal-translating channel thereof, and means differentially responsive to the high-frequency oscillations and to the output of the frequency follower for effecting operation of the motor only when the differential response is other than a predetermined value.
  • Means comprising the motor are provided for adjusting the frequency of the frequency follower substantially to that effective to produce a differential response of said predetermined value and to tune the receiver in accordance with the setting of the manual control means.
  • an oscillator at the receiver the frequency of which is adjustable in discrete steps by the control motor, the operation of the motor being dependent upon a difference frequency characteristic of the two oscillations.
  • the system is so proportioned that, when such frequency difference is equal to the value provided by a difference in the settings of the oscillators of at least one step, ample energy is provided to control the operation of the motor to adjust its associated oscillator to the step corresponding to the setting of the other oscillator while, when the oscillators are adjusted to corresponding steps, any residual inaccuracies in the circuit impedances result in insufiicient energy to effect operation of the motor at all, thus rendering the system noncritical to such incidental inaccuracies.
  • the tuning motor drives a plurality of contact-making devices, one for each tunable circuit of the receiver, for inserting fixed-tuned elements in the receiver circuits to tune the receiver to a predetermined station at each position of the control unit and each having con-
  • a system which has these features requires only the usual power-supply lines between the receiver and the remote-control station.
  • the single figure of the drawing is a circuit diagram, partly schematic, of a wave-signal receiving system embodying the remote-control system of the invention.
  • the complete system comprises a radio receiver I0, together with a remote-control arrangement which includes a remote-control unit II and an actuated control unit mounted adjacent or within the receiver and shown for convenience as two sections l2 and I3.
  • the function of section I2 is to adjust the tunable circuits of the receiver and that of section I3 is to effect operation of the off-on switch and the volume-control element of receiver Ill.
  • the receiver I is indicated schematically and may be of a conventional type in which the tuning units thereof are unicontrolled for selecting signals intercepted by an antennaground circuit
  • 0 includes sets of, adjustably-fixed tuning condensers l6, l6, adapted for unicontrol, a separate set of condensers being provided for each tunable circuit of the receiver, and a predetermined condenser of each of the sets designated by letters a-e being switched into its respective tunable circuit of the receiver to tune the receiver to a particular station.
  • the receiver III also comprises a volume-control potentiometer I1 and a transformer
  • a switch 9 is included in the primary circuit of transformer l8 and is adapted to be unicontrolled with volume-control potentiometer H, the switch 9 being opened when the potentiometer is in such a position as to reduce the volume'of the receiver to a minimum.
  • the remote-control system of the invention comprises an oscillator located at the remotecontrol unit II and an oscillator-modulator 2
  • the switches -34 are of the normally open type, push buttons -38 being adapted to be returned to their normally open position as soon as released by means of lever and springs 4
  • means are incorporated in the push-button unit whereby the last-operated button does not return fully to its former position in order to provide an indication of, the station to which the receiver is tuned.
  • the second grid of vacuum tube 22 is utilized as the oscillator anode and is connected to a feed-back circuit comprising inductance 43 inductively coupled .to inductance 23 of the frequency-determining circuit.
  • output of the oscillator section of tube 22 is electronically coupled to the anode-cathode circuit of the tube which, in turn, is coupled to the line l9 through a suitable plug and a band-pass filter including transformer 45, the primary winding of which is turned by condenser 46, shown in dotted lines for the reason that it may be comprised in whole or in part of the inherent capacitance of the output circuit of tube 22.
  • the frequency-determining circuit of the oscillator is adapted to be tuned by condensers 41' and 48'.
  • Condensers 41 and 48 are provided to tune the secondary winding of transformer 45 when condensers 41 and 48', respectively, are included in the circuit of the oscillator.
  • Condensers 41, 41', 48 and 48' may be connected in their appropriate circuits by means of switches 48 and 50 operated by push buttons 5
  • the band-pass filter comprising tuned transformer 45 is adapted to be connected to the source of power supply IQ for receiver l0 through a switch 54, preferably unicontrolled with push buttons 35-39 and 5
  • 2 of the control arrangement provided to effect tuning of receiver I0, comprises a tuning motor 60, the shaft of which is mechanically coupled to the shaft of the ganged switches-of condenser sets l6, l6 by means of reduction gears which maybe of any conventional type.
  • Power is supplied to operate motor through a thermostatic switch 6
  • is to open the circuit of motor 60 when the receiver III is not in operation so that motor 60 will not operate and disturb a previous tuning setting during the interval of heating of tubes 66 and 19 after power is supplied to the receiver.
  • the high-frequency tuning-control signals generated in remote unit II are transmitted over power linel9 to section l2 and are applied through transformer to the signal input grid of a frequency changer comprising tube 66.
  • the selector comprising transformer 65 is designed to pass a band of frequencies including those generated by oscillator 20 when any of push buttons 35-39 are operated and to reject the frequencies generated by oscillator 20 when push buttons 52 are operated for effecting volume control or on-oif operation of the receiver.
  • the primary winding of transformer 65 is seriestuned by means of condensers 61 and 61' and the secondary winding is tuned by condenser 60 and loaded by resistor 68'.
  • the selector provides an impedance which approximately matches that of the power-supply line I9 over the range of the prescribed control frequencies.
  • comprises an oscillator section for generating oscillations the frequency of which is variable in steps corresponding to those of oscillator 20 and comprising a frequency-determining circuit including an inductance tuned by condenser 1
  • also includes a feed-back circuit comprising an inductance 19 inductively coupled to inductance 10.
  • motor 60 may be operated by the heterodyne or beat frequency comprising the difference of the frequencies of oscillator and the oscillator section of oscillator-modulator 2I,
  • a triode rectifier tube 19 coupled to the output circuit of frequency changer 66 and adapted to energize relay 64.
  • the coupling circuit between the tube 66 and the rectifier 19 comprises a transformer 80 across the secondary winding of which is connected a loading resistor 8
  • a grid-leak resistor 04 is provided for rectifier 19.
  • Section I3 of the control system includes a motor 90 mechanically coupled to volume-control element I1 and the off-on switch 9 of receiver I0, preferably by means of reduction gears which may be of any conventional type.
  • Motor 90 is a reversible motor having windings 94 and 96 the energization of which from supply transformer 89 is controlled by reversing relays 9
  • may be energized by high-frequency oscillations transmitted from the control station II over the power lines I9
  • a series-resonant circuit comprising inductance I00 and condensers IOI and I02 coupled across the power lines I9 through conductors I03 and I04.
  • the input circuit of a pentode rectifier I05 is coupled across inductance I00, the output circuit of rectifier I05 comprising winding I06 of relay 9
  • a second series-tuned circuit for relay 92 comprising an inductance I01 and condensers I08, I09 coupled across power lines I9 through conductors I03 and I04 and a pentode rectifier IIO having its input circuit coupled across inductance I01.
  • rectifier H0 Connected in the output circuit of rectifier H0 is winding III of relay 92, shunted by condenser III.
  • a common cathode-biasing resistor H3 is provided for rectifiers I05 and H0, resistor 3 being adjustable and being by-passed by condenser II4.v
  • each of condensers 29, inclusive when connected in the circuit of oscillator 20 is effective to tune the oscillator to generate oscillations of a different predetermined frequency utilized to tune the receiver, while each of condensers 41, 49' is effective to tune oscillator 20 to generate a different frequency to effect volume control of the receiver and energization of the receiver and the control apparatus I2.
  • the frequencies of the oscillations generated by oscillator 20 are sufllciently different that they may be separated by selective circuits, the frequencies preferably being separated by 10 kilocycles or more and falling within the range of 90-250 kilocycles.
  • the frequencies generated by oscillator 20 should fall outside the range of signals to be received by the receiver I0 in order to avoid interference from the control signals. It will be understood that the oscillations generated by oscillator 20 for effecting a volume control have a frequency outside of the pass-band selector comprising transformer so that these oscillations have no effect on the timing unit I2.
  • Condensers 12-16, inclusive are effective to tune the oscillator section of oscillator-modulator 2
  • the seriestuned circuits I00, IIII, I02 and I01, I08 and I09 of unit I3 are tuned to the frequencies generated by oscillator 20 when tuned by condensers 41, 49', respectively.
  • is released opening switch 54 and relay 9
  • pushbutton 52 is operated, thereby causing oscillator 20 to deliver a different predetermined frequency to the power lines I9.
  • Series-tuned circuit I01, I00, I09 is resonant at this frequency and effects operation of relay 92 through rectifier 0 to operate motor 90 in such direction as to reduce the volume of the receiver or to remove power from receiver I0 and unit I2 by opening switch 9.
  • the motor is stopped at the desired point by releasing push-button 52 before switch 9 is opened.
  • thermostatic relay 62 are closed a predetermined time after energization of the primary winding of transformer I8 through switch 9. During this interval tubes 66 and 19 are heated and, provided no control signal is applied to tube 66, tube 19 draws sufficient anode current to open relay contact 63.
  • the receiver is tuned to the station indicated as c on the dial at the remote control station. With the elements in the positions indicated and switch 31 in the dotted position, the tuning control arrangement is in a condition of equilibrium. Under the conditions assumed, the oscillations of oscillator-modulator 2
  • the tuning arrangement is considerably unbalanced resulting in a difference in frequency of a value other than that corresponding to equality of the frequencies of the inputs to oscillator-modulator 2
  • Motor Bil is thus energized to adjust the frequency follower and the tuning of the receiver.
  • locks exactly to zero beat frequency due to incidental couplings within tube 66 and from the circuit comprising transformer to the frequency-determining circuit 10, Ii, 18 when the frequency of the oscillations generated at the remote station is close to the resonant frequency of the frequency-determining circuit of oscillator-modulator 2
  • the receiver may be turned off and on, the volume may be adjusted, anyone of any desired number of stations may be selected, and indication may be produced at the remote-control unit showing the station to which the receiver is tuned.
  • remote unit II will never be outside the conceiver is installed so that the high-frequency oscillations utilized to effect control are not attenuated in passing through a watt-hour meter.
  • the attenuation afforded by such meters prevents interference between similar neighboring remotecontrol installations.
  • control oscillations generated in remote unit H are transmited to the controlled units i2 and I3 of the receiver over the power lines l9, that a separate two-conductor cable may be utilized for transmission of the control oscillations or that they may be transmitted to the receiver by radiation in a known manner. 7
  • the frequency follower of the invention may take a arcane variety of forms.
  • the frequency follower may comprise a passive electrical network and suitable frequency-respom sive control apparatus.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of differ ent carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a control station remote from said motor and including a source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a frequency-adjustable frequency follower at said'receiver and external to said channel, means differentially responsive to said high-frequency oscillations and to the output of said frequency follower for effecting operation of said motor only when said differential response is other than a predetermined value, and means comprising said motor for adjusting the frequency of said frequency follower substantially to that effective to produce a differential response of said predetermined value and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a.
  • control station remote from said motor and including a source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a frequency-adjustable frequency follower at said receiver and external to said channel, means differentially responsive to said, high-frequency os-, cillations and to the output of said frequency follower for effecting operation of said motor only when said differential response is above a predetermined value, the response of said differentiallyresponsive means being less than said predetermined value only when the frequency of said frequency follower bears a predetermined relation to that of said source, and means comprising said motor, a remote-control system comprising, a
  • control station remote from said motor and including a source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a frequency-adjustable frequency follower at said receiver and external to said channel, means differentially responsive to said high-frequency oscillations and to the output of said frequency follower for effecting operation of said motor only when said differential response is above a predetermined value, the response of said difierentially responsive means being less than said predetermined value only when the frequency of said frequency follower is substantially equal to that of said source, and means comprising said motor for adjusting the frequency of said frequency follower substantially to equality with that of said source of oscillations and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a control station remote from said motor and including a source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a frequency follower at said receiver adjustable in discrete steps and external .to said channel, means differentially responsive to said highfrequency oscillations and to the output of said frequency follower for effecting operation of said motor only when said differential response is above a predetermined value, the response of said differentially-responsive means being less than said predetermined value only when the frequency of said frequency follower bears a predetermined relation to that of said source, and means comprising said motor for adjusting the frequency of said frequency follower substantially to said predetermined relation and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a control station remote from said motor and including a first source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a second source of high-frequency oscillations at the receiver and external to said channel, the frequency of said second source being adjustable, means responsive to the difference of two similar characteristics of said oscillations for effecting operation of said motor only when said difference is above a predetermined value, and means comprising said motor for adjusting the frequency of said second source substantially to that effective to produce a differential response of less than said predetermined value and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a control station remote from said motor and including a first source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for ying the frequency of said source, a second source of high-frequency oscillations at the receiver and external to said channel, the frequency of said second source being adjustable in discrete steps, means responsive to the difference of two similar characteristics of said two oscillations for effecting operation of said motor only when said difference is above a predetermined value, and means comprising said motor for adjusting the frequency of said second source substantially to that effective to produce a differential response of less than said predetermined value and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor,
  • a remote-control system comprising, a control station remote from said motor and including a first source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a second source of high-frequency oscillations at the receiver and external to said channel, the frequency of said second source being adjustable in discrete steps, means responsive to the difference in frequency of said oscillations for effecting operation of said motor only when said difference is above a predetermined value, and means comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a control station remote from said motor and including a first source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a second source of high-frequency oscillations at the receiver and external to said channel, the frequency of said second source being adjustable in discrete steps, means responsive to the difference in frequency of said oscillations and comprising a high-pass filter and rectifier for effecting operation of said motoronly when said difference is above a predetermined value, and means comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of differ-- ent carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a
  • control station remote from said motor and including a source of high frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a second source of high-frequency Oscillations at the receiver and external to said channel, the frequency of said second source being adjustable in discrete steps, means including a modulator for developing from said first and second sources a beatfrequency oscillation, means responsive to said beat-frequency oscillation for effecting operation of said motor only when said beat frequency is above a predetermined value, and mea s comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating. channel tunable to any of a plurality of signals of different carrier frequencies, a nonreversible tuning motor and tuning means for said receiver driven by said motor, a remote-control system comprising, a controlstation remote from said motor and including a first source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a second source of high-frequency oscillations at the receiver and external to said channel, the frequency of said second source being adjustable in discrete steps, means including a modulator for developing from said first and second: sources a beat-frequency oscillation, means responsive to said beat-frequency oscillation for effecting operation of said motor only when said beat frequency is above a predetermined value, and means operable in only one direction by said motor for adjusting the frequency of said second source substantially to that effective to produce a beat frequency of less than said predetermined value and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and fixedtuned tuning means for said receiver adapted to be switched into the circuit 'of said receiver by said motor, a remote-control system comprising, a control station remote from said motor and including a source of high-frequency oscillations the frequency of which is adjustable in discrete steps to frequencies different from that of any of said plurality of signals, a frequency-adjustable frequency follower at said receiver and exteral to said channel, means differentially responsive to said high-frequency oscillations and to the output of said frequency follower for effecting operation of said motor only when said differential response is above-.a predetermined value,
  • a tuning motor and tuning means for said receiver driven by said control station remote from said motor and including an oscillator comprising a first source oi high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means comprising adjustablyfixed tuning elements for varying the frequency of said oscillator, a second source of high-frequency oscillations at the receiver and external to said channel, the frequency of said second source being adjustable in discrete steps, means responsive to the difference in frequency of said oscillations for eflecting operation of said motor only when said difference is above a predetermined value, and means comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, a tuning motor and tuning means for said receiver driven by said motor, a remotecontrol system comprising, a control station remote from said motor and including a first source of high-frequency oscillations of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, a second source of high-frequency oscillations, the frequency of said second source being adjustable in discrete steps, means responsive to the difference frequency of said oscillations for effecting operation of said motor only when said difference is above a predetermined value, means comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means, and means comprising'said first source and said manual control means for effecting a volume control of said receiver.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, an actuating motor and tuning means for said receiver driven by said said line to said receiver, means responsive to the difference of said oscillations for effecting operation of said motor only when said difference is above a predetermined value, means comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means, and means responsive to oscillations from said first source transmitted over said line for effecting a volume control of said receiver.
  • a remote-control wave-signal receiver including a received-signal translating channel tunable to any of a plurality of signals of different carrier frequencies, an actuating motor and tuning means for said receiver driven by said control station remote from said motor and including a first source of high-frequency oscilla- 1 tions of frequencies different from that of any of said plurality of signals, manual control means for varying the frequency of said source, an oscillator for generating a second source of highfrequency'oscillations at the receiver and external to said channel, a plurality of adjustablyfixed tuning elements for adjusting the frequency of said second source in discrete steps, means responsive to the difference frequency of said sources for effecting operation of said motor only when said diflerence is above a predetermined value, and means comprising said motor for adjusting the frequency of said second source substantially to that of said first source and to tune the receiver in accordance with the setting of said manual control means, the incidental'couplings of said first and second sources of oscillations being such that they lock at exactly zero beat frequency when the frequency setting

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US236400A 1938-10-22 1938-10-22 Remote control wave signal receiver Expired - Lifetime US2188498A (en)

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Application Number Priority Date Filing Date Title
US236400A US2188498A (en) 1938-10-22 1938-10-22 Remote control wave signal receiver
GB27767/39A GB533136A (en) 1938-10-22 1939-10-12 Improvements in remote control system for wave-signal receivers
FR863060D FR863060A (fr) 1938-10-22 1940-01-25 Récepteur de signaux par ondes commandé à distance

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US236400A US2188498A (en) 1938-10-22 1938-10-22 Remote control wave signal receiver

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US2188498A true US2188498A (en) 1940-01-30

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US236400A Expired - Lifetime US2188498A (en) 1938-10-22 1938-10-22 Remote control wave signal receiver

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FR (1) FR863060A (fr)
GB (1) GB533136A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477241A (en) * 1944-08-21 1949-07-26 Automatic Elect Lab Remote-control system
US3052848A (en) * 1959-05-11 1962-09-04 Admiral Corp Remote control television
US3169223A (en) * 1960-10-10 1965-02-09 Gen Electric Apparatus for energizing radio receiver in response to power line alarm signal
US3268817A (en) * 1960-06-13 1966-08-23 Zenith Radio Corp Remote control system having time delay means

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477241A (en) * 1944-08-21 1949-07-26 Automatic Elect Lab Remote-control system
US3052848A (en) * 1959-05-11 1962-09-04 Admiral Corp Remote control television
US3268817A (en) * 1960-06-13 1966-08-23 Zenith Radio Corp Remote control system having time delay means
US3169223A (en) * 1960-10-10 1965-02-09 Gen Electric Apparatus for energizing radio receiver in response to power line alarm signal

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Publication number Publication date
FR863060A (fr) 1941-03-22
GB533136A (en) 1941-02-06

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