US2102165A - Radio circuits - Google Patents

Radio circuits Download PDF

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Publication number
US2102165A
US2102165A US701434A US70143433A US2102165A US 2102165 A US2102165 A US 2102165A US 701434 A US701434 A US 701434A US 70143433 A US70143433 A US 70143433A US 2102165 A US2102165 A US 2102165A
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United States
Prior art keywords
circuit
frequency
tuned
damping
resistance
Prior art date
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Expired - Lifetime
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US701434A
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English (en)
Inventor
Posthumus Klaas
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RCA Corp
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RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2102165A publication Critical patent/US2102165A/en
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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D11/00—Super-regenerative demodulator circuits
    • H03D11/02—Super-regenerative demodulator circuits for amplitude-modulated oscillations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes
    • 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
    • H04B1/26—Circuits for superheterodyne receivers

Definitions

  • the selectivity is determinedby the term i. e. that the selectivity correspondsto that of two tuned circuits;
  • the selectivity correspondstothat oi; three or four circuits. Inorder to obtainthe above mentioned effect it is howevernecessary that the variation of the resistance-shouldbe -a purely sinusoidal one, at least that only very-weak harmonics should be produced.
  • the selectivity is therefore equal to:
  • the third harmonic offers an increased selectiv-- ity, whereas the filtering out of the fundamental frequency would cause a decrease of the selectivity.
  • Fig. 1 shows the tuned circuit damping by a utilization of the internal resistance of a tube
  • Fig. 2 shows therefor the use of a periodic alteration of a retroactive coupling.
  • the circuit arrangement shown in Figure 1 consists of a detector D1 whose grid circuit comprises a circuit LC tuned to the frequency m which is to be received.
  • the damping of this circuit varies periodically as in parallel with the inductance or with part thereof is connected the internal resistance of a tube M.
  • the resistance of this tube is sinusoidally varied with the aid of a generator g connected in the input circuit of said tube and producing oscillations of the ultra-audible frequency q, for example of 20,000 cycles.
  • the detector D1 is followed by a medium frequency amplifier which is tuned to a harmonic of the frequency of the generator 9 (1w).
  • the low frequency demodulation is brought about with the aid of a second detector Dz.
  • a variation of the resistance in the tuned circuit may be obtained not only as is shown in the form of construction above described, by parallel connection of the internal resistance of the amplifying tube, but also by periodically altering the retroactive coupling.
  • FIG. 2 Such a circuit arrangement is shown in Figure 2.
  • a circuit which is tuned to the frequency w to be received and which at the same time is located in the input circuit of an auxiliary tube M.
  • This input circuit comprises in addition a generator g which produces an auxiliary frequency q.
  • a coil L1 In the anode circuit of the tube M is connected a coil L1 which is coupled with the circuit LC and which consequently causes the damping of this circuit to vary periodically, viz. at the frequency q.
  • the output circuit of the detector again comprises a filter tuned to the frequency q or to a harmonic of said frequency (nq).
  • a relay circuit arrangement for the selective reception of electrical oscillations comprising a tuned input circuit for said relay, means for periodically varying the damping of said tuned circuit and a filter circuit for a multiple of the damping frequency connected in the output of the relay.
  • a relay circuit arrangement for the selective reception of electrica1 oscillations comprising a an electronic tube provided with an input cir-' cuit and'an output circuit, means for electrically connecting the source to the input circuit said input circuit being tunable to any frequency within a predetermined range of frequencies, a. variable resistance means shunted across at least a part of saidinput circuit, means for varying the value of said resistance at a predetermined rate to thereby periodically damp said input circuit, said output circuit including a tuned circuit tuned to a harmonic of the frequency of variation of said resistance and a utilizing circuit coupled to said output circuit.
  • variable resistance means comprises an electronic tube having its output circuit connected across the portion of the said tuned circuit and an input circuit including a periodically varying source of energy.
  • the method of receiving signal modulated carrier energy which comprises impressing the modulated carrier upon a tuned circuit which is tuned to the frequency of the carrier and periodically varying the damping of the tuned circuit at a supersonic frequency which is different than the frequency of the carrier whereby there is introduced into the tuned circuit energy to compensate for the energy lost in the tuned circuit due to the inherent resistance of the tuned circuit, combining the two energies and utilizing, from the products of the combination, energy of a frequency which isa multiple of the supersonic frequency.
  • a thermionic tube circuit including a tunable input circuit adapted to be tuned to the frequency of the desiredsignal waves and an output circuit, damping means for the tunable input circuit including means for periodically varying the damping of said input circuit at a frequency which is low as compared to that of the signal waves, said output circuit including a resonant circuit tuned to an integral multiple of said variation frequency and a utilizing circuit coupled to said output circuit.
  • the damping means comprises a thermionic tube having,
  • damping means comprises an auxiliary electronic tube having an input circuit and an output circuit which are coupled together, said input circuit including at least a portion of the tunable input circuit and by that the means for periodically varying the damping of the input circuit of the first tube comprises an alternating current generator in the input circuit of the auxiliary tube.
  • a detector circuit having a tunable input circuit adapted to be tuned to the fre- KLAAS POSTHUMUS.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US701434A 1932-12-12 1933-12-08 Radio circuits Expired - Lifetime US2102165A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2102165X 1932-12-12

Publications (1)

Publication Number Publication Date
US2102165A true US2102165A (en) 1937-12-14

Family

ID=7985021

Family Applications (1)

Application Number Title Priority Date Filing Date
US701434A Expired - Lifetime US2102165A (en) 1932-12-12 1933-12-08 Radio circuits

Country Status (4)

Country Link
US (1) US2102165A (enrdf_load_stackoverflow)
BE (1) BE400013A (enrdf_load_stackoverflow)
FR (1) FR765044A (enrdf_load_stackoverflow)
NL (1) NL39998C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE400013A (enrdf_load_stackoverflow)
NL39998C (enrdf_load_stackoverflow)
FR765044A (fr) 1934-06-01

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