US1892383A - High frequency signaling - Google Patents

High frequency signaling Download PDF

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Publication number
US1892383A
US1892383A US533674A US53367431A US1892383A US 1892383 A US1892383 A US 1892383A US 533674 A US533674 A US 533674A US 53367431 A US53367431 A US 53367431A US 1892383 A US1892383 A US 1892383A
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Prior art keywords
circuit
wave
amplifiers
coupling
coupled
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Expired - Lifetime
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US533674A
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English (en)
Inventor
Chireix Henri
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Societe Francaise Radio Electrique
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Societe Francaise Radio Electrique
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/50—Amplitude modulation by converting angle modulation to amplitude modulation

Definitions

  • section 1 contains the carrier wave generator, section 2 the source producing the modulated current, section 3 the coupling device with amplifier, section 4 the modulator, sections 5 and 5b the low energy amplifiers, sections 6 and'6b the intermediate energy amplifiers, and sections 7 and 7 b the high energy amplifiers.
  • carrier waves are produced consisting of a first unmodulated wave and a second wave of the same frequency and in phase quadrature with the first mentioned wave.
  • a resultant wave can be obtained having a single modulated phase of an amplitude which remains practically a constant.
  • shiftable in phase over a certain angle whereby the variations in phases due to the modulation is af- K fected symmetrically with respect to the bisection of this angle, it is possible by superposing these waves in opposition to obtain a wave with modulated amplitude which can be transmitted over the antenna.
  • each phase modulated wave can of course be amplified by an lndependent amplifier having a number of desired stages.
  • a master oscillator 11 is provided, being stabilized by a quartz crystal 12, the currents being generated in the oscillating circuit L C
  • an equilibrated Wheatstone bridge is provided including four self inductances L L etc.
  • a condenser C in serles wlth an ammeter 33 constitutes one diagonal ofthe bridge. Another diagonal includes the condenser C the ammeter 32,
  • the other diagonal of the WVheatstone bridge is influenced indirectly by the same master oscillator 11 through the intermediate action of the variable coupling L of the tube 21 provided in section 2 and the circuit of L C which are connected to the terminals of condenser G
  • the plate current of tube 21 is modulated according to above method'by controlling the anode by means of the modulator of section 4, which includes comprising an entrance transformer 40, a cascade of amplifiers 41, 42, 43 (the last stage being one of high energy), and a branch containing an iron self inductance 44 provided between the plates of the last stage and one terminal of the condenser G
  • the output voltages of the Wheatstone bridge are transmitted by the intermediate coil L to the input of the amplifiers 51 of sections 5 and 5b, and the currents therefrom are amplified respectively by the tubes 61 of sections 6 and 6?), each tube 61 preferably representing two tubes connected in parallel, and finally in the stages of the stages 7 and 7 b, the amplification takes place in the tubes 71, each tube designating in
  • Each coupling circuit includes two circuits, a pri-.
  • the primary and secondary circuits each includes self inductances and equal capacities L and C between the stages 6 and 7 the primary circuit includes the self inductance L and the capacity G while the secondary circuit includes the self inductance L and the capacity v
  • the coupling is obtained by means of condensers G and G respectively.
  • Each primary circuit is damped by the internal resistance of the preceding tube, and the secondary circuits by the resistance P and P respectively.
  • the output circuits in sections 7 and 7b each includes a self inductance L and condenser C and a coupling capacity G These capacities Gr are connected for the purpose of forming common circuit.
  • the coupling circuits are coupled in like manner as the self inductances of the Wheatstone bridge with coils L and in series with the capacities N which are connected to the grids of the preceding tubes for the purpose of com ensatin their capacities ro er. h p
  • the grids are inductively energized from separate coils.
  • the self inductance L is coupled with six hand madesecondary coils 6 and each connected to a grid of the tubes of the last stage -7. Also the inductance L is coupled with two secondary coils in order to obtain correspondence with the two tubes of the stage 6.
  • I H g I The circuit L C R of modulator section 4: for the amplifier of musical. frequency in a col-rector circuit, designed to compensate for the irregularities of the filter curves of the circuits of sections 3, 55?), 66b, and 7-77).
  • the apparatus operates in the following manner: 7
  • the lVheatstone bridge of I'section 3 is tuned to the supporting wave by means of condensers G and C whereby it will be noted at once that the direct coupling L0 be tween the generator of the carrier wave and the bridge results in producing voltages in the inductances L in opposite phase, of a fixed amount and unaffected by the modulation.
  • the bridge tuned by the capacity C behaves like a secondary circuit capacitatively'coupled with the terminals of the condenser G to a primary circuit L C Under these conditions the currents of the secondary circuit are always in quadrature with those of the primary circuit.
  • The'circuit L C when thus subjected to a voltage having a modulated amplitude and in phase with that of the generator 1, makes it evident that the indirect coupling L0 will induce a modulated current in the bridge which is in quadrature with that of the primary circuit, i. e. in quadrature also with the current due to coupling L0
  • the voltages in L are therefore in phase due to coupling L0 and subject to the modulation and individually in quadrature with the preceding voltages.
  • the resultant energizing voltages of the tubes of the sections 5 and 56 Will be practically of constant and absolute value but will present themselves a variable shifted phase between themselves.
  • the modulated wave will appear in the antenna in the same order'as in the circuit L12, 012, of the section 2.
  • Transmitter of modulated high frequency currents comprising aiVheatstone bridge consisting of four impedances and having tuning means inserted in the diagonals thereof, means for applying to one of these diagonals a carrier wave, means for applying to the other diagonal another continuous wave of the same frequency but in quadrature with the foregoing carrier wave, amplitude modulation means for this latter continuous wave, two symmetrical circuits coupled to the VVheatstone bridge each circuit comprising amplifiers in cascade, a common circuit associated with the output from the amplifiers and an antenna coupled to the said common circuit.
  • Transmitter of modulated high frequency currents comprising a WVheatstone bridge consisting of four impedances and having tuning means inserted in the diagonals thereof, means for applying to one of these diagonals a carrier wave by the intermediary of a symmetrical valve arrangement, means for applying to the other diagonal another continuous wave of the same frequency but in quadrature with the foregoing carrier wave, amplitude modulation means for this latter continuous wave two symmetrical circuits coupled with the Wheatstone bridge each circuit comprising amplifiers in cascade. a common circuit associated with the output from amplifiers and an antenna coupled to the said common circuit.
  • Transmitter of modulated high frequency currents comprising a VVheatstone bridge consisting of four impedances and having tuning means inserted. in the diagonals thereof. means for applying to one of these diagonals a carrier wave. means coupled 011 the one hand with the source of the said carrier wave and on the other hand associated with a circuit connected the terminals of a condenser inserted in the other diagonal in order to apply to this latter a continuous wave in quadrature with the foregoing carrfer wave,':amplitude modulation means for this latter continuous wave, two symmetrical circuits coupled to the l/Vheatstone bridge each circuit comprising amplifiers in cascade, a common circuit associated with the output of the amplifiers and an antenna coupled to the said common circuit.
  • Transmitter of modulated high frequency currents comprising a Wheatstone bridge having tuning means inserted in the diagonals thereof, means for applying to one of these diagonals a carrier wave, means for applying to the other diagonal another continuous wave of the same frequency but in quadrature with the foregoing carrier wave, amplitude modulation means for this latter continuous wave, two symmetrical circuits coupled to the Vheatstone bridge each circuit comprising amplifiers in cascade, the stages of which are capacitatively coupled, a resistance shunting the secondary coupling circuit in each stage, a common circuit associated with the output of the amplifiers and an antenna coupled to the said common circuit.
  • Transmitter of modulated high frequency currents comprising a Wheatstone bridge consisting of four impedances and having tuning means inserted in the diagonals thereof, means for applying to one of these diagonals a carrier wave, means for applying to the other diagonal another continuous wave of the same frequencybut in quadrature with the foregoing carrier wave, amplitude modulation means for this latter continuous wave, two symmetrical circuits coupled to the Wheatstone bridge each circuit comprising amplifiers in cascade, the stages of which are capacitatively coupled, a resistance shunting the secondary coupling circuit in each stage, an inductance and a capacity inserted between the input of the valve feeding each coupling and a point of this circuit, a common circuit associated with the output of the amplifiers and an antenna coupled to the said common circuit.
  • Transmitter of modulated high frequency currents comprising a VVheatstone bridge consisting of four impedances and hav'ng tuning means inserted in the diagonals thereof, means for applying to one of these diagonals a carrier wave, means for applying to the other diagonal another continuous wave of the same frequency but in quadrature with the foregoing carrier wave.
  • amplitude modulation means for this latter cont nuous wave.
  • each circuit comprising amplifiers in cascade each consisting of four impedances and stage of which comprises a certain number of valves, the input of each of these valves being connected to biasing means through individual self-inductances coupled to a common coupling circuit a common circuit associated with the output of the amplifiers and an antenna coupled to the said common circuit.
US533674A 1930-05-06 1931-04-29 High frequency signaling Expired - Lifetime US1892383A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR546958X 1930-05-06

Publications (1)

Publication Number Publication Date
US1892383A true US1892383A (en) 1932-12-27

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US533674A Expired - Lifetime US1892383A (en) 1930-05-06 1931-04-29 High frequency signaling

Country Status (4)

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US (1) US1892383A (fr)
DE (1) DE546958C (fr)
FR (1) FR39312E (fr)
GB (1) GB372090A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424971A (en) * 1944-07-21 1947-08-05 Bell Telephone Labor Inc Frequency-shift radio telegraph transmitting system
US2483262A (en) * 1945-07-12 1949-09-27 Harvey Radio Lab Inc Phase modulation system
US2645710A (en) * 1948-03-12 1953-07-14 Hartz Julius Radio transmission and carrier wave modulation
US2901599A (en) * 1954-07-16 1959-08-25 Rca Corp Amplitude-modulated radio transmitter combining two constant amplitude phase modulated signals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL57174C (fr) * 1938-12-02

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424971A (en) * 1944-07-21 1947-08-05 Bell Telephone Labor Inc Frequency-shift radio telegraph transmitting system
US2483262A (en) * 1945-07-12 1949-09-27 Harvey Radio Lab Inc Phase modulation system
US2645710A (en) * 1948-03-12 1953-07-14 Hartz Julius Radio transmission and carrier wave modulation
US2901599A (en) * 1954-07-16 1959-08-25 Rca Corp Amplitude-modulated radio transmitter combining two constant amplitude phase modulated signals

Also Published As

Publication number Publication date
GB372090A (en) 1932-05-05
FR39312E (fr) 1931-10-12
DE546958C (de) 1932-04-01

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