US1872634A - Receiving apparatus - Google Patents

Receiving apparatus Download PDF

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Publication number
US1872634A
US1872634A US290972A US29097228A US1872634A US 1872634 A US1872634 A US 1872634A US 290972 A US290972 A US 290972A US 29097228 A US29097228 A US 29097228A US 1872634 A US1872634 A US 1872634A
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United States
Prior art keywords
oscillations
heterodyne
grid
signal
sin
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Expired - Lifetime
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US290972A
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English (en)
Inventor
Henri Jean Joseph Marie De De
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Thales SA
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CSF Compagnie Generale de Telegraphie sans Fil SA
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    • 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
    • H03D7/10—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 different pairs of electrodes

Definitions

  • Figs. 1 and 2 it is possible to combine these two methods and thus increase to a considerable degree the amplitude of the oscillation of mean frequency produced in the receiver, the mean frequency being the inaudible intermediate frequency obtained by lowering the incoming signal frequency.
  • Fig. 1 represents the circuit arrangement for one form of the invention
  • Fig. 2 represents the .circuit arrangement for a modification where- .in a selfregenerative tube is used
  • Fig. 1 represents the circuit arrangement for one form of the invention
  • Fig. 2 represents the .circuit arrangement for a modification where- .in a selfregenerative tube is used
  • Fig. 1 represents the circuit arrangement for one form of the invention
  • Fig. 2 represents the .circuit arrangement for a modification where- .in a selfregenerative tube is used
  • FIG. 2a is a circuit analysis of the arrangement of As shown in Fig. 1 the signal is picked up by a resonator 1 consisting, for instance, of a coil antenna or frame tuned to the pulsation and itactuates one of the grids, say 7, confined within a two-gridtube, while the other grid 6 is subjected to the oscillations created by the local generator or heterodyne Qtuned to wave-length o
  • This'arrangement results in a current having a mean frequency of w a or co -(o depending on whether'o 'is smaller or larger than m '
  • the beat method is superposed as follows:
  • the grid 7 upon which the signal is broughtto .act is connectedwith therotor united with'two points 9 andlO of thelocal generator or heterodyne and are of opposite polarity.
  • H sin (o t-Pt) denotes the pobe applied to the resonator 1
  • H sin (w t'tilld'vr) denotes the pobe applied to the resonator 1
  • the heterodyne istuned tentialof the plate 12 that of the plate 13 Wlll consequently be H sin (w t'tilld'vr)
  • the couplings 1112 and 1113' cause an electromotlve force due to the local generator to current having frequency M which is superposed upon the signal current and is brought to interfere with it, the .two acting combinedly uponthe same electrode '7.
  • the two frequency changing methods are employed at the same time. 7
  • the first modulation system is the one which may be observed in a tube in which two electrodes are simultaneously submitted to two oscillations; there is obtained a known plate current in which figures, amongst other things, the product of the two oscillations.
  • the term represents the first current of modulation which is utilized in the receiver.
  • the second modulation is obtained by superposing, in the usual manner, the oscillations of the signal and the heterodyne on a same electrode and by detecting the resulting oscillation.
  • the grid 7 is already the seat, with respect to the signal, of the oscillation 5 sin w t On it is superposed the one of the bet erodyne by means of the electrostatic couplingof one of the condensers 11, 12 or 11, 13 but the sign of the coupling is not arbitrary, the second modulation thus obtained reinforcing the first in one operating sense and chokingthe same in the other sense.
  • the amplitude of the resulting oscillation R- has very closely the value CTI with the combinations a and d U+S cos [(m w )t+l,b+7r] with the combinations 6 and a and the current detected due to the second system of modulation has the value Ks cos wz-wazw with the combinations a and d COS [(w "10 If'lz/ll'w] with the combinations 7) and 0.
  • the coefficient K depends on the detecting power of the tube, which power itself is a function of the degree of action of the heterodyne, hence of the electrostatic coupling C due to condenser 11, 13 or 11, 12.
  • the combinations (1 and d furnish a second current modulated in phase with the first. Hence, there exists amplification of the reception.
  • w w Fig. 2 shows a similar circuit scheme comprising the use of a self-regenerative twogrid tube.
  • the plate 13 may then be associated either directly with the end of the local generator or else with the plate 8, these two points being practically at the same high frequency potential.
  • the method of receiving electric signals comprising impressing the received signal on one of the grids of a vacuum tube, impressing locally generated oscillations upon another grid of the same vacuum tube, impressing the locally generated oscillations upon the first grid at the same time that the received signal is impressed thereon, and collecting the combined signal and local oscillations in the output circuit of the tube.
  • a circuit arrangement comprising a resonator for receiving incoming signals, a tube comprising two grids, a device for generating local oscillations, means for impressing the local oscillations upon one of the grids, means for impressing the received signals on the same grid, and means for impressing the local oscillations of the said generating device upon the second grid so that the received signals are heterodyned and modulated at the same time.
  • a circuit arrangement comprising means for receiving incoming signals, a vacuum tube having at least two grids, means for generating local oscillations, the received signals being impressed upon one of the grids and the local oscillations being impressed upon the other grid and upon the plate, a condenser comprising one rotor and two independent stators, the rotor of the condenser being connected to the same grid which receives the incoming signals, the stators being respectively connected to the other grid and the plate, and means to collect the combined oscillations in the anode circuit of the tube.
  • the method of receiving electric signals which consists in impressing received signals upon the control electrode of a space discharge device, generating local oscillations, impressing the generated oscillations upon an independent control electrode of said discharge device and simultaneously impressing the generated oscillations upon the first control electrode with the impression of the received signals thereon.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Superheterodyne Receivers (AREA)
US290972A 1927-07-13 1928-07-07 Receiving apparatus Expired - Lifetime US1872634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR649698T 1927-07-13

Publications (1)

Publication Number Publication Date
US1872634A true US1872634A (en) 1932-08-16

Family

ID=9003458

Family Applications (1)

Application Number Title Priority Date Filing Date
US290972A Expired - Lifetime US1872634A (en) 1927-07-13 1928-07-07 Receiving apparatus

Country Status (4)

Country Link
US (1) US1872634A (fr)
BE (1) BE352800A (fr)
FR (1) FR649698A (fr)
GB (1) GB293839A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL45199C (fr) * 1933-01-14
DE971670C (de) * 1933-01-30 1959-03-12 Hazeltine Corp Schaltung zur gleichzeitigen Schwingungserzeugung und Modulation in einer Roehre mitmindestens drei zwischen Kathode und Anode angeordneten Gitterelektroden

Also Published As

Publication number Publication date
BE352800A (fr)
FR649698A (fr) 1928-12-26
GB293839A (en) 1928-11-29

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