US2436066A - Transmitter with anode voltage modulation - Google Patents

Transmitter with anode voltage modulation Download PDF

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Publication number
US2436066A
US2436066A US578207A US57820745A US2436066A US 2436066 A US2436066 A US 2436066A US 578207 A US578207 A US 578207A US 57820745 A US57820745 A US 57820745A US 2436066 A US2436066 A US 2436066A
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US
United States
Prior art keywords
anode
voltage
high frequency
stage
transmitter
Prior art date
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
US578207A
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English (en)
Inventor
Favre Marcel
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.)
Patelhold Patenverwertungs and Elektro-Holding AG
Original Assignee
Patelhold Patenverwertungs and Elektro-Holding AG
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Publication of US2436066A publication Critical patent/US2436066A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/24—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to different grid
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes

Definitions

  • the present invention concerns an arrangement for modulating the anode voltage ofthe high frequency power stage of a transmitter consisting of a high and low frequency part.
  • an 'arrangement'analteration in the anode voltage alsocauses the interval of time dur- "sing'which the anode current flows or the anode current flow angle to vary.
  • This angle becomes larger, the efficiency correspcndingly lower and the maximum power output too small.
  • the modulation characteristic II shown in Fig. 1 which" represents the relationship between the high frequency anode alternating voltage Ew and the anode direct voltage Ea for-a constant alternating grid voltage, is thus a curve and not the desired straight line I.
  • control grid bias voltage of the high frequency power stage and simultaneously theanode voltage of the tube stage in front of the high frequency power stage being subjected in'opposite phase and in phase respectively toa modulation with a modulation depth at least about equal to the anode voltage of the high frequency power stage.
  • the invention possesses several advantages when compared with known arrangements. Since the power of the stage in front of the h gh frequency power stage is regulated by altering the anode voltage in rhythm with the modulation voltage. this is only subjected to a maximum'l'oad during the voltage peaks and not continuously. The mean power required can thus be considerably reduced for this stage so that the life of the tubes in this stage-are considerably prolonged. The. average efficiency of. the end stage becomes greater, because it does not decrease during the-voltage peaks but maintains its value; at the same time the distortions become smaller. Furthermore the improved effici'ency enables the tubesto be better utilized.
  • Fig. 1 is a plot showing the relationship between'anodedirect voltage and high frequency:
  • Fig. '2 is a schematic diagram of oneiorm of 'the inven'tion
  • Fig. 3 is a plot showing the grid voltage-anode current characteristic of a tube
  • Fig. 4 is a schematic view of a modified "fforr'n of the invention.
  • the high frequency carrier oscillations are produced in the high frequency 'part of the transmitter are; rangement shownin theupper portion of Figures 2*"an'd 4.
  • "The low frequency amplifier shown below serves 130"?0111'1 *the modulation voltages.
  • reference numeral l indicatesan oscillator-Tor producing high frequency "(Ri a oscillations which reach the 7 grid of-tube '2 where they are amplified.
  • In the anode circuit ofthis tube is a-n oseiIl-ationcireuit 3 which actsas a load. "If necessary a frequency multiplication can be combined with this amplification.
  • the high frequency alternating voltages are taken from this oscillation circuit 3 and passed over acoupllng condenser to the grid'of the next stage.
  • Tube 1 is-c-onnected to an oscillation circ'uitt from whence the poweris supplied toan antenna or a further stage.
  • This consists of the audio or' sp'eech frequency (AF) source H, tubes 12' operating in ipush+pull connection, and transformer l3. lnparallel with the secondary win'ding ofthe' 'latter-isa choke-coil l4.
  • Condenser 16' pre vents the direct-anode current oftube 'l from flowing through the "secondarywinding of transformer-f3. .Th'is currentfinds a path through choke coil 16.
  • FIG. 4 Amodified form of the invention is illustrated in Fig. 4. Elements corresponding to those already shown in Fig. 2 are indicated by the same reference numerals, so that these elements and their method of operation do not require to be described again.
  • the modulated high frequency stage which can be an end or intermediate stage, consists of two tubes I inpush-pull connection. Transformer 2
  • the primarywinding 22 of the transformer has an alternating anode current flowing through itbecause that half of the choke coil 9 which is at the cathode side prevents this current. from flowing to earth.
  • This alternating anode voltage produces two voltages in transformer 2!, one of which lies across the winding 23; it serves to influence the grid bias voltage
  • essary for controlling the anode voltage of tube [ is taken from the secondary winding 24. It is fed over condenser 25, which is required to sep arate the "direct anode-voltage from the earth.
  • a particular advantage of the arrangement according to Fig. 2 or 4 is that the anode voltage modulation is free from distortion and the efliciency also remains constant.
  • Fig. 2 can be simplified if choke'coil I4 is omitted. In this case the anode current of tubes 2 and I flows through the secondary side of transformer l3.
  • the high power stage formed by tubes 1 can consist of a single tube or several tubes connectedin push-pull or in parallel. It is preferably connected in such a manner that it oper-' ates as a class C amplifier.
  • the tubes of this stage can also be operated in class B or A, with-'j' out the advantages resulting from the invention being thereby affected.
  • a high frequency part comprising; an oscillator producing a high frequency carrier wave, an amplifier stage arranged for amplifying the output of said oscillator, and a power stage connected to the output of aid amplifier stage; a low frequency part comprising a source of audio frequency modulating potential; means to modulate the amplitude of said carrier wave in accordance with said modulating potential; and means simultaneously subjecting the grid bias potential of said power stage and the anode potential of said amplifier stage in opposite phase and in phase, respectively, to a modulation having a modulation depth at least approximately etqual to that of the anode potential of said power s age.
  • a transmitter as defined in claim 1 and further including phase adjusting means for ad-- justing the phase of at least one of the modulating potentials to which said grid and anode are simultaneously subjected.

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  • Amplitude Modulation (AREA)
  • Amplifiers (AREA)
US578207A 1944-01-04 1945-02-16 Transmitter with anode voltage modulation Expired - Lifetime US2436066A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH599382X 1944-01-04

Publications (1)

Publication Number Publication Date
US2436066A true US2436066A (en) 1948-02-17

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US578207A Expired - Lifetime US2436066A (en) 1944-01-04 1945-02-16 Transmitter with anode voltage modulation

Country Status (5)

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US (1) US2436066A (en(2012))
BE (1) BE460090A (en(2012))
CH (1) CH243240A (en(2012))
FR (1) FR912554A (en(2012))
GB (1) GB599382A (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629858A (en) * 1950-12-29 1953-02-24 Rca Corp Transistor amplitude modulator
US2644925A (en) * 1950-12-29 1953-07-07 Rca Corp Semiconductor amplitude modulation system
US2877424A (en) * 1955-07-11 1959-03-10 Time Inc Method of connecting two cascaded modulators to provide a variable percentage of modulations
US2907956A (en) * 1957-11-15 1959-10-06 Hollingsworth R Lee Gating modulation
US3021487A (en) * 1958-09-02 1962-02-13 Sperry Rand Corp Frequency modulation distortion cancellation system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138653A (en) * 1937-10-29 1938-11-29 Gen Electric High efficiency modulating and amplifying system
US2226258A (en) * 1938-09-22 1940-12-24 Bell Telephone Labor Inc Grid bias modulating system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2138653A (en) * 1937-10-29 1938-11-29 Gen Electric High efficiency modulating and amplifying system
US2226258A (en) * 1938-09-22 1940-12-24 Bell Telephone Labor Inc Grid bias modulating system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629858A (en) * 1950-12-29 1953-02-24 Rca Corp Transistor amplitude modulator
US2644925A (en) * 1950-12-29 1953-07-07 Rca Corp Semiconductor amplitude modulation system
US2877424A (en) * 1955-07-11 1959-03-10 Time Inc Method of connecting two cascaded modulators to provide a variable percentage of modulations
US2907956A (en) * 1957-11-15 1959-10-06 Hollingsworth R Lee Gating modulation
US3021487A (en) * 1958-09-02 1962-02-13 Sperry Rand Corp Frequency modulation distortion cancellation system

Also Published As

Publication number Publication date
CH243240A (de) 1946-06-30
GB599382A (en) 1948-03-11
FR912554A (fr) 1946-08-13
BE460090A (en(2012))

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