US2108154A - Receiver tuning circuits - Google Patents

Receiver tuning circuits Download PDF

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Publication number
US2108154A
US2108154A US93354A US9335436A US2108154A US 2108154 A US2108154 A US 2108154A US 93354 A US93354 A US 93354A US 9335436 A US9335436 A US 9335436A US 2108154 A US2108154 A US 2108154A
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United States
Prior art keywords
rectifier
circuit
signal
input circuit
frequency
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Expired - Lifetime
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US93354A
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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
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Publication of US2108154A publication Critical patent/US2108154A/en
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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H03G3/26—Muting amplifier when no signal is present

Definitions

  • This invention relates to a circuit arrangement grid 2 of a pentode 3.
  • the screening grid is for assisting the tuning of wireless receiving sets. connected to a point of a resistance I8 by which Such arrangements are particularly desirable for the voltage supply leads are bridged.
  • the cathsets having automatic volume control, since in ode is connected to the negative conductor by this case it is often very difficult for laymen to way of a resistance which provides negative grid find the point of correct tuning.
  • the circuit bias since in ode is connected to the negative conductor by this case it is often very difficult for laymen to way of a resistance which provides negative grid find the point of correct tuning.
  • the output circuit of the valve includes a arrangement according to the invention serving circuit 4 which comprises an inductance and a for assisting tuning is set into operation upon capacity and which may be tuned to the interaccurately tuning to the desired carrier wave. mediate frequency, although as an alternative an
  • the tuning may be assisted, for example, in that aperiodic circuit may be used.
  • the voltage acan optical device is set into operation upon the tive in the output circuit is supplied via a concorrect tuning being reached, or in that not until denser 5 to a rectifier B, l which jointly with two this moment the low frequency amplifier part of resistances 2 b and I3 constitutes a closed direct the set is caused to become operative.
  • the incurrent circuit is provided via a concorrect tuning being reached, or in that not until denser 5 to a rectifier B, l which jointly with two this moment the low frequency amplifier part of resistances 2 b and I3 constitutes a closed direct the set is caused to become operative.
  • the output circuit of the tube 3 is in addition coupled via the condenser 8 to a circuit 9 of low damping tuned to the intermediate frequency carrier wave.
  • the voltages occurring in this circuit are supplied to the rectifier i, H, and bring about a voltage drop across the resistances i2 and H3 in such manner that the upper point of the resistance l2 becomes negative relatively to the lower.
  • the two rectifiers may be separated from each other, but preferably, as shown in Fig. 1, they are housed in a single bulb and have one common cathode.
  • the resist ance I3 is included in both rectifier circuits.
  • the resistance it constitutes the input circuit of a rectifier valve M, the output circuit of which includes a magnetic braking device I5 which, as will be described hereinafter, prevents any further movement of the tuning knob ll upon the correct tuning of the latter to a carrier wave.
  • the shaft of the knob has mounted on it a braking disc it of soft iron. Instead of using a magnetic braking device, it is also possible to use an electrostatical one.
  • the device operates as follows:
  • two rectifiers are coupled to the highfrequency or intermediatefrequency amplifier in such a manner that one of the rectifiers is preceded by greater selectivity than the other.
  • the rectifiers are connected in such a manner that the rectifier voltage of one rectifier influences the other in such a manner that this latter rectifies only in the immediate vicinity of the resonance frequency and that the rectified current of this rectifier is used for the control of the device by which tuning is assisted.
  • the part of the receiving set that assists tuning solely serves this purpose and rectification of the high-frequency oscillations and are effected by other valves separated therefrom.
  • the circuit arrangement is preferably arranged in such manner that the direct current of the rectifier which is preceded by the greatest selectivity brings about the control.
  • Fig. 1 shows a circuit diagram of one form of the invention
  • Fig. 2 graphically shows the operation of the invention
  • Fig. 3 shows a modified form of the invention.
  • the curve (1. represents the voltage across the resistance l3 as a function of the frequency of the arriving signal.
  • the point 6 corresponds to the resonance frequency of the circuit 4.
  • the curve 1) represents the voltage across the circuit 9 as a function of the frequency. It is obvious that the rectifier I, II is not caused to become operative until this voltage exceeds the voltage across the resistance l3, consequently, when in tuning a frequency corresponding to one of the points 0 or d is reached. Not until then has the resistance [2 occurring through it a potential drop which applies such a bias to the tube [4 that the brake is set into operation. It is easy so to proportion the circuit 9 that the device is set into operation at a frequency which differs very little for example by a few hundred cycles, from the natural frequency of the circuit 9.
  • the tube M can be connected so that the anode current increases upon the arrival of a signal.
  • the second coil on the magnet core of the brake can be dispensed with.
  • the control voltage for the braking device may also be derived from a further resistance, for example I2, since it can be obtained by adequate proportioning that the current of the rectifier path 6-1 ceases when the current across the second path attains a given value.
  • Numerals iii and I9 denote appropriate I. F. bypass condensers.
  • Figure 3 shows a slightly different circuit arrangement which diifers from that shown in Figure 1 in that the valve 3 also serves as a braking valve.
  • the voltage active across the resistance I2 is led back to the control grid of this valve, and the braking device 15 is included in the anode circuit of this valve.
  • a glow discharge lamp 20 is provided for this purpose.
  • the resistance 23 as well as the condenser 2i serve for smoothing the voltage led back.
  • the resistance 22 is the input resistance for the grid of the valve 3.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current flow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, and means responsive to current flow in the second rectifier for controlling the operation of said first means.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current flow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, and means responsive to current flow in the second rectifier for controlling the operation of said first means, said tuner control means comprising a magnetic brake device constructed to prevent adjustment of the tuner element when energized.
  • a control net- Work for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current fiow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, means responsive to current flow in the second rectifier for controlling the operation of said first means, said signal impressing means including an amplifier, and said amplifier also being included in said last named responsive means.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current flow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, means responsive to current flow in the second rectifier for controlling the operation of said first means, said tuner control means comprising a magnetic brake device, and said controlling means including a tube in Whose space current circuit is connected said brake device.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current fiow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, means responsive to current flow in the second rectifier for controlling the operation of said first means, said signal impressing means and controlling means both including a common amplifier tube.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current flow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, means responsive to current flow in the second rectifier for controlling the operation of said first means, and a signal amplitude limiter connected across said first resonant input circuit.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current fiow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, and means responsive to current flow in the second rectifier for controlling the operation of said first means, said tuner element having a metallic member operatively associated therewith, said adjustment control means including a device which acts as a magnet on said member when energized.
  • a control network for said means comprising a pair of rectifiers, a resonant signal input circuit, tuned to a desired signal frequency, coupled to one rectifier, a second signal input circuit, tuned to said desired frequency coupled to the second rectifier, the selectivity at the second circuit being greater, means for impressing signals on said signal circuits, means responsive to current fiow in said one rectifier for preventing current flow in the second rectifier until the signal amplitude at the second input circuit attains a desired value, means responsive to current fiow in the second rectifier for controlling the operation of said first means, and each of said rectifiers being a diode, the diodes having a common cathode.
  • an intermediate frequency energy network a rectifier coupled thereto to rectify signal energy in said network, a second rectifier having an intermediate frequency input circuit which has a higher degree of selectivity than the first network, means for coupling the latter to said second rectifier input circuit, means responsive to current flow in the first rectifier for preventing rectification by the second rectifier until the signal amplitude at the input circuit thereof exceeds a predetermined amplitude, and means responsive to the rectified current output of the second rectifier for preventing adjustment of said tuning element.
  • an intermediate frequency energy network a rectifier coupled thereto to rectify signal energy in said network, a second rectifier having an intermediate frequency input circuit which has a higher degree of selectivity than the first network, means for coupling the latter to said second rectifier input circuit, means responsive to current flow in the first rectifier for preventing rectification by the second rectifier until the signal amplitude at the input circuit thereof exceeds a predetermined amplitude, means responsive to the rectified current output of the second rectifier for preventing adjustment of said tuning element, an amplifier including said network in its space current circuit, and said amplifier being included in said last named means.
  • an intermediate frequency energy network a rectifier coupled thereto to rectify signal energy in said network, a second rectifier having an intermediate frequency input circuit which has a higher degree of selectivity than the first network, means for coupling the latter to said second rectifier input circuit, means responsive to current fiow in the first rectifier for preventing rectification by the second rectifier until the signal amplitude at the input circuit thereof exceeds a predetermined amplitude, and means responsive to the rectified current output of the second rectifier for preventing adjustment of said tuning element, said last means including an electron discharge tube whose input electrodes are energized by the second rectifier current output.

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  • Rectifiers (AREA)
  • Magnetic Treatment Devices (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
US93354A 1935-08-20 1936-07-30 Receiver tuning circuits Expired - Lifetime US2108154A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE467771X 1935-08-20
DE1935N0038765 DE687209C (de) 1935-08-20 1935-10-27 Schaltanordnung zur Erleichterung der Abstimmung eines Radioempfangsgeraetes

Publications (1)

Publication Number Publication Date
US2108154A true US2108154A (en) 1938-02-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US93354A Expired - Lifetime US2108154A (en) 1935-08-20 1936-07-30 Receiver tuning circuits

Country Status (6)

Country Link
US (1) US2108154A (en(2012))
BE (1) BE417050A (en(2012))
DE (1) DE687209C (en(2012))
FR (1) FR809653A (en(2012))
GB (1) GB467771A (en(2012))
NL (1) NL54190C (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499875A (en) * 1945-07-18 1950-03-07 Colonial Radio Corp Motor tuning stopping circuit
US2541017A (en) * 1947-04-30 1951-02-13 Farnsworth Res Corp Automatic station selector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499875A (en) * 1945-07-18 1950-03-07 Colonial Radio Corp Motor tuning stopping circuit
US2541017A (en) * 1947-04-30 1951-02-13 Farnsworth Res Corp Automatic station selector

Also Published As

Publication number Publication date
DE687209C (de) 1940-01-25
NL54190C (en(2012))
FR809653A (en(2012)) 1937-03-08
BE417050A (en(2012))
GB467771A (en) 1937-06-23

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