US2097879A - Receiving arrangement - Google Patents

Receiving arrangement Download PDF

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Publication number
US2097879A
US2097879A US758551A US75855134A US2097879A US 2097879 A US2097879 A US 2097879A US 758551 A US758551 A US 758551A US 75855134 A US75855134 A US 75855134A US 2097879 A US2097879 A US 2097879A
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United States
Prior art keywords
circuit
feedback
frequency
adjustable
regeneration
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Expired - Lifetime
Application number
US758551A
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English (en)
Inventor
Hammer Arthur
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2097879A publication Critical patent/US2097879A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers

Definitions

  • the suggestion is made to raise the audio frequency amplification of the higher frequencies by so choosing the resonance between the choke coil serving for establishing coupling relations with a higher stage and the condenser serving to regulate the feedback, that it falls within the upper end of the frequency range.
  • Fig. 1 shows a circuit embodyingapractical application of the idea underlying the invention and Fig. 2 is a diagram serving to explain the 'operation of the circuit.
  • G denotes the rectifier tube to which the alternating voltage to be rectified is fed from the antenna A by way of the radio frequency transformer M.
  • the choke coil L which is contained in the plate circuit, serves for coupling.
  • Feedback is established in a parallel branch with coil S and condenser C.
  • Choke coil L and feedback condenser C are of such dimensions that the natural frequency of the oscillation circuit consisting of the choke and the condenser, in the case of loose regeneration, lies outside the transmitted frequency band; in other words, above 10,000 cycles per second. As the feedback is raised by raising C, this resonance more and more approaches the transmission range, and this, incidentally, means an improvement in the amplification of the higher frequencies.
  • a radio receiving circuit comprising a vacuum tube and associated input and output circuits, a feedback circuit including an adjustable reactance for controllingthe selectivity of the input circuit, means for compensating for the loss in gain of high tonal frequencies caused by an increase in the selectivity upon increase of feedback, said compensating means comprising an inductance in the output circuit which forms with the adjustable feedback reactance an oscillation circuit resonating at a frequency which for slight feedback lies outside the transmitted audio frequency range and which with increase of feedback is shifted more and more into the transmission range.
  • a radio receiving circuit according to the preceding claim, wherein the audio frequency oscillation circuit has associated with it one or more resistances which serve for radio frequency filtering and at the same time for the damping of audio frequency resonance.
  • a radio receiving circuit comprising a vacuum tube and associated input and output circuits, means including an adjustable condenser for feeding back energy from said output to said input circuit tocontrol the sharpness of tuning, means for compensating for the loss in gain of high tonal frequencies incidental with increase in sharpness of tuning, said compensating means comprising an inductance in the output circuit which forms with the adjustable feedback condenser an oscillation circuit resonating at a frequency which for slight feedback lies outside the transmitted audio frequency range and which with increase of feedback is shifted more and more into the transmission range.
  • a radio receiving circuit according to the preceding claim, wherein the mentioned vacuum tube is coupled to a second tube and the output circuit inductance serves as the coupling means.
  • a regenerative detector having an adjustable reactance to control the degree of regeneration, an inductance in the plate circuit of the detector serving to couple the same to an audio frequency amplifier, said adjustable reactance and said inductance constituting an oscillation circuit the natural frequency of which varies with the degree of regeneration in such a manner that the natural frequency of the oscillation circuit is outside the tonal frequencies at small degrees of regeneration and within the tonal frequencies at large degrees of regeneration.
  • a regenerative detector having a tunable input circuit, a feedback circuit including a series connected inductance magnetically coupled to said input circuit and an adjustable condenser for controlling the degree of regeneration, a choke coil in the output circuit of the detector serving to couple the same to an audio frequency amplifier, said adjustable condenser and said choke coil constituting an 0.8-- cillation circuit the natural frequency of which varies with the degree of regeneration in such a manner that the natural frequency of the oscillation circuit is outside the tonal frequencies at small degrees of regeneration and within the tonal frequencies at large degrees of regeneration.
  • a radio receiving circuit comprising an electronic tube, a tunable input circuit and an output circuit for said tube, means for connecting the input circuit to a source of signalling energy, means for connecting the output circuit to a signal energy utilizing device, said input circuit being linked with said output circuit to facilitate the transfer of energy from said output circuit to said input circuit, an adjustable reactance for controlling the amount of energy transferred from the output circuit to the input circuit and thereby control the selectivity characteristics of the input circuit, means for compensating for the loss in gain of high tonal frequencies caused by an increase in the selectivity upon operation of the adjustable reactance in a direction to increase theamount of energy fed from the output circuit to the input circuit, said compensating means comprising a reactance device in the output circuit which together with said adjustable series with the choke coil, one being included reactance forms an oscillation circuit resonating at a frequency which at low energy transfer between the output circuit and the input circuit lies above the transmitted audio frequency range and which with increase in the amount of transfer of energy from the output circuit to the input circuit is shifted more and more into the upper

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Transmitters (AREA)
US758551A 1933-12-23 1934-12-21 Receiving arrangement Expired - Lifetime US2097879A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2097879X 1933-12-23

Publications (1)

Publication Number Publication Date
US2097879A true US2097879A (en) 1937-11-02

Family

ID=7984813

Family Applications (1)

Application Number Title Priority Date Filing Date
US758551A Expired - Lifetime US2097879A (en) 1933-12-23 1934-12-21 Receiving arrangement

Country Status (2)

Country Link
US (1) US2097879A (fr)
FR (1) FR783003A (fr)

Also Published As

Publication number Publication date
FR783003A (fr) 1935-07-06

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