US2189897A - Modulation system - Google Patents

Modulation system Download PDF

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Publication number
US2189897A
US2189897A US184646A US18464638A US2189897A US 2189897 A US2189897 A US 2189897A US 184646 A US184646 A US 184646A US 18464638 A US18464638 A US 18464638A US 2189897 A US2189897 A US 2189897A
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US
United States
Prior art keywords
modulation
voltage
high frequency
amplifier
grid
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
US184646A
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English (en)
Inventor
Gutzmann Fritz
Niederbarnim Kreis
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
Application granted granted Critical
Publication of US2189897A publication Critical patent/US2189897A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators

Definitions

  • This method is of merely theomeans in order to derive from the modulation retical value, not having been carried into effect Currents-the input Circuit f member .l iS likelo so far. y wise connected to the microphone 5-a continuous 1o
  • voltage which is fluctuating in accordance with the invention suggests to combine therewith the the mean value of the modulation amplitudes.
  • the method using such counter Sal'eol by line Sold counter coupling coupling may be employed in conjunction with In order to avoid the aforesaid anodal retro- 35 the aforesaid modulating method even without acllon lne best course Wlll be lo dellve o counter the aid of the Hapug meth0d voltage from the output transformer of amplifier
  • the invention will be understood from the fol- ⁇ l2 Wllin the ald of uiwlnding I3 and t0 convey lowing description, reference being had to the llhls Voltage '0o the glld of tube 9 Over 8 tranS-' 40 accompanying drawing which is a wiring diagram formel l- Iii 1S of course DOSSlble also to take 40 of one embodiment of the invention.
  • e ll'ansformer 3 is include@ in the grid elm-:ult of provided with the hitherto knownk anode voltage part 2 and 1s located also 1n the output circuit of control (normal anode voltage modulation' not 50 a medulatien ampliei" 4. 5 indicates, a micro' the aforesaid amplifier for modulated high frephone.
  • a saving of about 200 k. W. is afforded, while the saving over the anode voltage modulation is about 166 k. w.
  • a high frequency transmitter arrangement comprising a source for producing a high frequency carrier, means for modulating said high frequency carrier with a modulation voltage, means for fluctuating said high frequency carrier in dependency upon the mean value of said' modulation Voltage, a power amplifier, means for applying to said power amplifier the modulated and fluctuated high frequency carrier, and means for varying the anode direct current potential of said power amplifier dependent upon said modulation voltage.
  • a high frequency transmitter arrangement comprising a source for producing a high frequency carrier, means for modulating said high frequency carrier with a modulation voltage, means for fluctuating said high frequency carrier in dependency upon the mean value of said modulation voltage, a power amplifier, means for applying to said power amplier the modulated and fluctuated high frequency carrier, and means for varying the anode direct current potential of said power amplifier dependent upon said modulation voltage, said last mentioned means being a class B amplifier of the push-pull type.
  • a high frequency transmitter arrangement comprising a source for producing a high frequency carrier, means for modulating said high frequency carrier with a modulation voltage, means for fluctuating said high frequency carrier in dependency upon the mean value of said modulation Voltage, a power amplifier, means for applying to said power amplifier the modulated and fiuctuated high frequency carrier, means for varying the anode direct current potential of said power amplifier dependent upon said modulation voltage, and counter coupling means for conveying said modulation Voltage to the grid of said power amplifier.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Amplitude Modulation (AREA)
US184646A 1937-01-13 1938-01-12 Modulation system Expired - Lifetime US2189897A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE205375X 1937-01-13

Publications (1)

Publication Number Publication Date
US2189897A true US2189897A (en) 1940-02-13

Family

ID=5786884

Family Applications (1)

Application Number Title Priority Date Filing Date
US184646A Expired - Lifetime US2189897A (en) 1937-01-13 1938-01-12 Modulation system

Country Status (6)

Country Link
US (1) US2189897A (ru)
BE (1) BE425727A (ru)
CH (1) CH205375A (ru)
FR (1) FR831994A (ru)
GB (1) GB503443A (ru)
NL (1) NL54832C (ru)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2605397A (en) * 1950-02-25 1952-07-29 Westinghouse Electric Corp Radio receiver for single side band signals
US2969508A (en) * 1957-06-28 1961-01-24 Mark I Jacob Grid modulation system for simultaneous am and fm transmissions
US4737192A (en) * 1983-10-17 1988-04-12 Manville Service Corporation Refractory binder, method for making same, and product produced thereby

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2605397A (en) * 1950-02-25 1952-07-29 Westinghouse Electric Corp Radio receiver for single side band signals
US2969508A (en) * 1957-06-28 1961-01-24 Mark I Jacob Grid modulation system for simultaneous am and fm transmissions
US4737192A (en) * 1983-10-17 1988-04-12 Manville Service Corporation Refractory binder, method for making same, and product produced thereby

Also Published As

Publication number Publication date
CH205375A (de) 1939-06-15
GB503443A (en) 1939-04-06
BE425727A (ru)
FR831994A (fr) 1938-09-16
NL54832C (ru)

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