US2503787A - Radio receiver gain control - Google Patents

Radio receiver gain control Download PDF

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Publication number
US2503787A
US2503787A US764754A US76475447A US2503787A US 2503787 A US2503787 A US 2503787A US 764754 A US764754 A US 764754A US 76475447 A US76475447 A US 76475447A US 2503787 A US2503787 A US 2503787A
Authority
US
United States
Prior art keywords
frequency
circuit
stage
potentiometer
control
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
US764754A
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English (en)
Inventor
Westerveld Adolf
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2503787A publication Critical patent/US2503787A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/46—Reflex amplifiers
    • H03F3/48—Reflex amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes
    • H03G3/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/02—Manually-operated control
    • H03G5/04—Manually-operated control in untuned amplifiers
    • H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
    • H03G5/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
    • H03G9/06—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control
    • H03G9/08—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control incorporating negative feedback

Definitions

  • the invention relates to a radio-receiver with negative feedback in the low-frequency part thereof, which receiver comprises means of controlling the amplification.
  • the present invention afiords means of providing a simple radio-receiver with avery effective volume control.
  • radio-receiver both of a highfrequency volume control brought about-with the aid of a potentiometer and of a low-frequency volume control brought about my means of a variable negative feedback, the control of the negative feedback and the high-frequencyvolume control being effected by means of the same potentiometer.
  • the potentiometer is preferably connected to the voltage to be fed back and, moreover, it is made in the included, at least partly, in the aerial circuit.
  • the regulating contact of the potentiometer is connected, as the case may be, with the interposition of suitable impedances, bothto.
  • a simple radio-receiver with a particularly effective control of the amplification may be obtained if the said receiver is constructed as a superheterodyne reflex-receiver wherein both the intermediate-frequency oscillations and the lowfrequency oscillations derived therefrom after amplification and detection are amplified in the same discharge system, in which automatic control of the amplification is utilized.
  • the aerial is connected, through the intermediary of a coupling'condense'r l'; to a potentiometer which consists of two resistances 2 and 3 and which is connected to the secondary terminals of a loudspeaker transformer 4, from which the voltage to be fed back negatively is taken.
  • the regulating contact of the potentiometer is connected, on the one hand, through the intermediary of an input oscillatory circuit 5 which is tuned to the high-frequency oscillations to be received, to the control grid of a heptode system 6 which serves to change the quency and low-frequency volume-controls results 5 Claims. (01.
  • triode-heptode a triode-heptode
  • both the high-frequency voltage A on the control grid of the heptode system 6 and the degree of low-frequency'negative feedback of the triode 8 are regulated.
  • the high-frequency voltage In the highest position of the contact the high-frequency voltage has the highest value and the negative feedback is switched off; in the lowest position the highfrequency voltage has the smallest value whereas the degree of the negative feedback is at its maximum.
  • the two controls consequently support one another; this is important in connection with the automatic volume-control utilized for 1 the triode 8, for this' automatic volume-control,
  • the heptode 6 acts at the same time as an oscillator and to that end it is connected in threepoint connection to an oscillator circuit 9.
  • the anode circuit is also incorporated the first circuit of an intermediate-frequency band-pass filter ID the second circuit of which forms part of the control grid circuit of the triode 8.
  • the intermediate-frequency oscillations produced in the anode circuit of the heptode 6 are consequently taken to the control grid of the triode;
  • the amplified oscillations are taken from an intermediate-frequency circuit l I, which is inductively coupled to' the anode circuit of the triode 8 and, for the purpose of rectification, they are 3 between the anode circuit and the control grid circuit.
  • the amplified low-frequency oscillations which are set up across a resistance IS in the anode circuit of'the triode' 8 are supplied-through a coupling condenser l1 tothe control grid of the pentode portion of the discharge tube 12.
  • a coupling condenser l1 tothe control grid of the pentode portion of the discharge tube 12.
  • the pri-" mary winding of the previously mentioned loud speaker transformer 4 secondary winding of this transformer is earthed:
  • the tuning of the circuits B and 9 to thesignal to be received is preferably efiected' by-"varying" the self-inductance of this circuit with-the aid of slidable iron cores.
  • a receiver circuit arrangement for there' The mid-point of the tion-stage; means to derive an output potential ception of carrier signals having a modulation fr'e I quency component, comprising a carrierfre quency stag having an input circuit, a modulation frequency stage coupled to -said carrier frequency stage and having. input and output circuitsga potentiometer having a movable tapping; means to derive a negativefeedbackvoltage proportional-to said modulation component from the output circuit of a said modulation frequency stage and to applysaid voltage to the ends of said potentiometer, means to applysaid signals to one nd of said potentiometer, and means to couple the tapping ofsaid potentiometer to the input circuit'of said carrier frequency stage-and,
  • a superheterodyne receiver circuit arrangement for the reception of :carrier signals having a modulation frequencycomponent, comprising a carrier frequency: mixing; stage having an input circuit, a modulation frequency amplification stage coupled to said carrier-frequency stage and having input and output circuits,- a potentiometer?
  • a reflex receiver circuit arrangement for the 1 reception ofca-rrier signals having a modulation frequency component, comprising acarrier fr'e-- quencystage having an input circuit, an amplification stage" coupled to I said carrier frequency; stage, a detector stage coupled to said amplification stage, a modulationfrequency stage coupled to said amplification stage and having, an output circuit, means to apply; a portion of the output of said detector-stage to said-amplification stage, a" potentiometer having a-movabletapping, means to derive a negative feedbackv voltage proportional to said modulation component from the output circuit of said modulation frequency.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
US764754A 1943-03-05 1947-07-30 Radio receiver gain control Expired - Lifetime US2503787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL624010X 1943-03-05

Publications (1)

Publication Number Publication Date
US2503787A true US2503787A (en) 1950-04-11

Family

ID=19788516

Family Applications (1)

Application Number Title Priority Date Filing Date
US764754A Expired - Lifetime US2503787A (en) 1943-03-05 1947-07-30 Radio receiver gain control

Country Status (4)

Country Link
US (1) US2503787A (fr)
BE (1) BE454669A (fr)
FR (1) FR902400A (fr)
GB (1) GB624010A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673255A (en) * 1950-09-27 1954-03-23 Amalgamated Wireless Australas Volume control arrangement for radio receivers
US2848615A (en) * 1956-05-21 1958-08-19 Philco Corp Frequency control system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB396822A (en) * 1932-02-18 1933-08-17 Gen Electric Co Ltd Improvements in electric wave signalling apparatus
US1988370A (en) * 1929-12-06 1935-01-15 Philadelphia Storage Battery Automatic volume control
US1996830A (en) * 1928-09-19 1935-04-09 Rca Corp Amplifier
US2115842A (en) * 1933-04-18 1938-05-03 Emi Ltd Volume control arrangement
US2159453A (en) * 1929-06-13 1939-05-23 King Mfg Corp Dual action volume control
US2205243A (en) * 1938-12-15 1940-06-18 Gen Electric Amplifier

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1996830A (en) * 1928-09-19 1935-04-09 Rca Corp Amplifier
US2159453A (en) * 1929-06-13 1939-05-23 King Mfg Corp Dual action volume control
US1988370A (en) * 1929-12-06 1935-01-15 Philadelphia Storage Battery Automatic volume control
GB396822A (en) * 1932-02-18 1933-08-17 Gen Electric Co Ltd Improvements in electric wave signalling apparatus
US2115842A (en) * 1933-04-18 1938-05-03 Emi Ltd Volume control arrangement
US2205243A (en) * 1938-12-15 1940-06-18 Gen Electric Amplifier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673255A (en) * 1950-09-27 1954-03-23 Amalgamated Wireless Australas Volume control arrangement for radio receivers
US2848615A (en) * 1956-05-21 1958-08-19 Philco Corp Frequency control system

Also Published As

Publication number Publication date
GB624010A (en) 1949-05-26
FR902400A (fr) 1945-08-29
BE454669A (fr)

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