US2088059A - Arrangement for modulating the amplitude of electric waves - Google Patents

Arrangement for modulating the amplitude of electric waves Download PDF

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Publication number
US2088059A
US2088059A US37446A US3744635A US2088059A US 2088059 A US2088059 A US 2088059A US 37446 A US37446 A US 37446A US 3744635 A US3744635 A US 3744635A US 2088059 A US2088059 A US 2088059A
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US
United States
Prior art keywords
arrangement
resistances
amplitude
modulating
bridge
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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
US37446A
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English (en)
Inventor
Schulze-Herringen Erich
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz 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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
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Publication of US2088059A publication Critical patent/US2088059A/en
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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

  • the carrier proper may in a well-known manner he composed of two vectors whose quantity and phase vary in dependency upon the modulation frequencies.
  • the carrier frequency is in accordance with the invention led to the one diagonals of two bridges which are formed of ohmic resistances and capacitive resistances, i. e. so-called capacitances, and to whose other diagonals circuits are connected that act on a push-pull arrangement, the ohmic re- 'sistances of the bridges being varied in the rhythm of the modulation.
  • Fig. 1a represents a circuit arrangement showing the principle of the invention
  • Fig. 1b is a diagram relating to the operation of this arrangement
  • Fig.2 shows three diagrams which likewise refer to the operation thereof
  • Fig. 3a diagrammatically represents a modification of the arrangement illustrated in Fig. 1a
  • Fig. 3b is a 95 diagrammatic representation of 'a modification of the arrangement shown in Fig. 311
  • Fig. 4 diagrammatically illustrates a transmitter embodying features of the invention.
  • the carrier frequency arriving from the con- 30 trol transmitter S is led to a high frequency transformer Tl, after having eventually been amplified sufficiently.
  • two bridge arrangements I, II are included over the diagonals A, B.
  • Each of these bridges 3.5 comprises two ohmic resistances Ral, Ra! or Rbl, R212 and two condensers Cal, Ca2 or C121, C122.
  • CD of these bridges not fed from TI are high frequency transformers T2, T3 which serve to feed a push- -io pull arrangement U.
  • Fig. 1b is showing corresponding diagrams for the bridges.
  • the arrow A represents the secondary voltage at the bridge I
  • the arrow B the secondary voltage at bridge II
  • the arrow directed vertically towards the top represents the voltage applied thereto.
  • the angles 5 i and 2 result from the current diagrams shown for both bridges.
  • the resistances and condensers shown in Fig. 1a are marked by dotted lines and the designations for the current vectors correspond with the designations applied 10 to the resistances and condensers in Fig. 1a.
  • I 15 When'using an infinite resistance the phase angle would become zero, which does not happen in practice.
  • Fig. 2 is showing the current diagrams for both bridges in which the individual resistances and condensers are drawn in for a 20 better characterization.bearing the same designations as those shown in Fig. 1a.
  • the resistances Ral are represented relatively by two resistances, namely, by a stationary resistance RaII and a variable resistance RaIII according to the above statements. By changing these variable resistances also the position of the vector determining the angle go may be changed.
  • the resistance variation in the rhythm of the modulation amplitudes is according to a further feature of the invention effected by means of electronic tubes.
  • the principal arrangement of the bridges is shown in Figs. 3a, 3b, whilst Fig.
  • Fig. 3a the ohmic resistances of the bridge are replaced by the inner resistances of the valves.
  • the modulation frequency is led to the centres of the Valves over the low frequency transformers HI H4.
  • the high frequency is kept away from the transformers by means of connecting thereto high frequency chokes.
  • each resistance consists of two tubes which are grid-controlled and whose anodes and cathodes are connected in the manner shown, the anode of each tube being in connection with the cathode of the other tube, viz. connected to the same point.
  • the resistance of the valves would change in the rhythm of the applied high frequency whereby the phase of the high frequency itself would be changed continuously.
  • a cathode and an anode of the valves are connected with each other they are parallel for the high frequency and their resistance is constant with respect to the high frequency.
  • the valves are .connected in series. On modulation the working point of each valve is shifted in the rhythm of modulation.
  • the low frequent modulation is supplied over auxiliary low frequency transformers Hi, H2, H3, H4.
  • the primaries of HI, H2, H3, H4 are connected in parallel and in such a manner that on the one hand all the grids and on the other hand all the cathodes are connected to the same side.
  • diodes may be arranged which are given the required anode biases.
  • The-arrangement according to Fig. 3b differs fromthe example shown in Fig. 3w in this that in the case of Fig. 3b diodes are employed and that-the low frequency is supplied at the anodes.
  • the control of the inner resistance of the valve has been effected by the grid through the use of transformers.
  • the inner resistance of the valves may be changed by varying the anode direct voltage in the rhythm of modulation.
  • Such a connection is shown in Fig. 3b.
  • the anode direct voltage EA is varied over the low frequency transformer M in the rhythm of modulation.
  • special chokes connected to the valves the high frequency is retained and is prevented from flowing off over the direct current source as well as the two bridge branches are prevented from influencing each other.
  • variable resistance disposed in the line is adapted to serve for the adjustment of the exact working point.
  • inductance connected across diagonals CD which may be the primary of a transformer, is for supplying energy to a load circuit.
  • the circuit elements are evident from the drawings.
  • the arrangement may be adjusted for a predetermined at rest value of the carrier with the aid of the at rest current of the tubes of the bridge arms, this being effected by varying the continuous anode voltage, but may be adjusted also by means of the capacities disposed in the bridge arms.
  • a variation of the amplitudes may be attained by varying one of the resistances of the bridge arms not to the same extent as the other or in the limiting case by keeping it constant.
  • Figs. 1b and 2 are showing arrangements in which the resistances are equally varied in the If for instance one resistance is left constant whereas the other one is varied, there are not only changed the phases ofthe derived voltage over the applied voltage, but there occurs also an amplitude variation.
  • a high frequency source with two bridge arrangements, each comprising oppositely disposed ohmic resistances andoppositely disposed capacitances, means connecting said high frequency source to a diagonal of each of these bridges, a plurality of electronic tubes connected in push-pull relation, means interconnecting the input of the push-pull tube arrangement with the other (11- necting the anode of each tube with the cathode of the other tube.
  • each of said ohmic resistances comprises two electronic tubes, means for connecting the anode of each tube with the cathode of the other tube and common voltage sources for feeding said tubes.

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)
  • Amplifiers (AREA)
  • Amplitude Modulation (AREA)
US37446A 1934-09-06 1935-08-23 Arrangement for modulating the amplitude of electric waves Expired - Lifetime US2088059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE448595X 1934-09-06

Publications (1)

Publication Number Publication Date
US2088059A true US2088059A (en) 1937-07-27

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ID=6538156

Family Applications (1)

Application Number Title Priority Date Filing Date
US37446A Expired - Lifetime US2088059A (en) 1934-09-06 1935-08-23 Arrangement for modulating the amplitude of electric waves

Country Status (4)

Country Link
US (1) US2088059A (enMihai)
FR (1) FR794084A (enMihai)
GB (1) GB448595A (enMihai)
NL (1) NL44569C (enMihai)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654838A (en) * 1947-09-06 1953-10-06 Bbc Brown Boveri & Cie Impulse circuit
US2922959A (en) * 1953-04-29 1960-01-26 British Telecomm Res Ltd Electric modulators
US3021074A (en) * 1957-05-08 1962-02-13 Socony Mobil Oil Co Inc Electroic triode bridge multiplier
US3270278A (en) * 1962-08-20 1966-08-30 Us Rubber Co High frequency a. c. bridge with low frequency modulation

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654838A (en) * 1947-09-06 1953-10-06 Bbc Brown Boveri & Cie Impulse circuit
US2922959A (en) * 1953-04-29 1960-01-26 British Telecomm Res Ltd Electric modulators
US3021074A (en) * 1957-05-08 1962-02-13 Socony Mobil Oil Co Inc Electroic triode bridge multiplier
US3270278A (en) * 1962-08-20 1966-08-30 Us Rubber Co High frequency a. c. bridge with low frequency modulation

Also Published As

Publication number Publication date
GB448595A (en) 1936-06-11
NL44569C (enMihai)
FR794084A (fr) 1936-02-07

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