US2294073A - Decimeter wave transmitter - Google Patents

Decimeter wave transmitter Download PDF

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Publication number
US2294073A
US2294073A US309353A US30935339A US2294073A US 2294073 A US2294073 A US 2294073A US 309353 A US309353 A US 309353A US 30935339 A US30935339 A US 30935339A US 2294073 A US2294073 A US 2294073A
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US
United States
Prior art keywords
voltage
anode
grid
circuit
frequency
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
US309353A
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English (en)
Inventor
Christ Karl
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 US2294073A publication Critical patent/US2294073A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/04—Means in or combined with modulating stage for reducing amplitude modulation

Definitions

  • This invention relates to the modulation of the frequency in decimeter wave transmitters connected in feed-back, the feed-back connection being preferably of the so-called three-point or cathode-point type.
  • the frequency in generators of this kind maybe varied by varying the anode voltage.
  • varying the anode voltage in the rhythm of a modulating voltage a frequency' modulation is obtained.
  • Such variation also results in varying the high frequency energy and thus entails the disadvantage that in addition to the desired frequency modulation an undesirable amplitude modulation takes place.
  • both the frequency and the high frequency amplitude will. be increasing in their turn.
  • a frequency modulation may be obtained also by'varying the grid bias periodically while keeping the anode voltage constant.
  • an undesired amplitude modulation results.
  • This phenomenon is the reverse of that which occurs in the event of an anode voltage modulation, because on varying the grid bias in the positive sense the frequency will decrease while the amplitude will be increasing.
  • Figs. 1, 2, 3 are diagrams each showing one embodiment of the invention.
  • Fig. 1 illustrates a modulating voltage coupled to a transmitting tubeA by means of a potentiometer; Fig.
  • Fig. 2 illustrates a modulating 'voltage coupled to a transmitting tube by means of transformers; and Fig. 3 illustrates a modu lating voltage coupled t ⁇ o the grid of a trans- Y mitting tube and a resistor in 'the anode circuit of the tube for regulating the anode voltage thereof in accordance -with variations in the modulating voltage.
  • the arrangement represented in Fig. 1 has an electronic transmititng tube l the circuit arthree-point connection.
  • the modulating voltage U is supplied at terminals 2, 3 over a potentiometer 4 in a manner to affect anode voltage and grid voltage both at the same time.
  • a battery 5 in the anode circuit A serves as anode voltage source.
  • taps 6, 1 the ratio between anode voltage variation and grid voltage variation can be so adjusted that the high frequency amplitude remains constant.
  • the grid circuit G a choke coil 8 and a resistance 9 are included, which however are immaterial to the idea of the invention.
  • Fig. 2 The arrangement according to Fig. 2 is based on the principle involved in the arrangement shown in Fig. 1, with the difference that thex modulating voltage U is impressed upon the anode circuit A and the grid circuit G over transformers l0, il.
  • Fig. 3 discloses means for effecting the invention in a manner diiierent vfrom the mode of opeartion peculiar to the arrangements illus ⁇ trated in Figs. 1 and 2.
  • the arrangement according to Fig. 3 hence has the advantage that the modulating voltage need only be supplied to the grid circuit and that'the concurrent anode voltage variation, which acts to suppress an undesired amplitude modulation, 'is effected automatically.
  • the requisite modulating energy is here very small.
  • the vnovel arrangement will be useful in many It is suitable not only for the modulation of transmitters but also for the purpose of respects.
  • an automatic rangement of which is of the type known as sharp tuning of a heterodyne receiver may be ator an oscillator constructed in accordance with the invention. From the output circuit of such receiver a regulating voltage is taken and this voltage is made to control the oscillator by acting on vboth the grid circuit and anode circuit at the same time.
  • a circuit arrangement for producing frequency modulated decimeter waves comprising an elec' tronic oscillator having a grid circuit and an obtained by employing as heterodyning generfrequency'uf the output energy of said oscillator 'comprisingilrst andreoond transformers, the

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  • Microwave Amplifiers (AREA)
US309353A 1938-12-09 1939-12-15 Decimeter wave transmitter Expired - Lifetime US2294073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0096509 1938-12-09

Publications (1)

Publication Number Publication Date
US2294073A true US2294073A (en) 1942-08-25

Family

ID=7288384

Family Applications (1)

Application Number Title Priority Date Filing Date
US309353A Expired - Lifetime US2294073A (en) 1938-12-09 1939-12-15 Decimeter wave transmitter

Country Status (5)

Country Link
US (1) US2294073A (en))
BE (1) BE437269A (en))
CH (1) CH212950A (en))
FR (1) FR868422A (en))
NL (1) NL56614C (en))

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528084A (en)) * 1953-04-15
DE1263869B (de) * 1964-06-09 1968-03-21 Telefunken Patent Modulatorschaltung

Also Published As

Publication number Publication date
CH212950A (de) 1940-12-31
NL56614C (en))
FR868422A (fr) 1941-12-30
BE437269A (en))

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