US1805918A - Oscillation generation - Google Patents

Oscillation generation Download PDF

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Publication number
US1805918A
US1805918A US313703A US31370328A US1805918A US 1805918 A US1805918 A US 1805918A US 313703 A US313703 A US 313703A US 31370328 A US31370328 A US 31370328A US 1805918 A US1805918 A US 1805918A
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United States
Prior art keywords
tubes
frequency
frequencies
oscillations
generation
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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
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US313703A
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English (en)
Inventor
Meissner Alexander
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Telefunken AG
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Telefunken AG
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Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US1805918A publication Critical patent/US1805918A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity

Definitions

  • This invention relates to the generation of oscillations, and more particularly to the generation, alternately, of oscillations of different frequencies, for the reduction of fading.
  • the object of the present invention is to provide a transmitter arrangement for wireless communication especially on extra-short It is a well-known fact that when working with short waves disturbances in traflic are often produced because the income ing signal strength becomes periodically or transiently very small or even drops to zero. Such variationsv in intensity, known as fading, are substantially due to interference phenomena. In order to eliminate them it is suggested to send the same signals simultaneously on carriers of two or more frequencies, inasmuch as fading depends upon the frequency that is used, so that, if two or more different wave-lengths are employed, simultanenous extinction of both or all of these frequencies is not to be anticipated.
  • the two thermionic tubes provided to generate or amplify the different frequencies are supplied from an alternating current source in push pull or phase opposition, so that the plates of the two transmitters are alternately fed with the positive halfcycles required for the production of oscillations. In this way, all chances of one of the tubes happening to fall inside the range of 313,703, and in Germany November 24, 1927.
  • Radio frequency waves modulated by alternating current are subject to less fading, seeing that the modula-.. tion itself produces a decomposition or division of the frequency.
  • Two thermionic tubes E1 and E2 are connected transmitter fashion and are made to work upon two antennae A1 and A2.
  • One of these thermionic tubes, E1 contains in its plate circuit an oscillation circuit S1, and in its grid circuit an oscillation circuit 81, which are tuned to one of the waves, while the other thermionic tube has two similar oscillatory circuits S2 and 82 which are tuned to the other wave to be generated.
  • the working potentials for these two tubes are furnished y way of transformer T from an alternating current source, as shown.
  • FIG. 2 Such an arrangement is indicated in Figure 2, which is quite similar to the arrangement shown in Figure 1 except that in this case the tubes E1 and E2 are amplifier tubes, rather than oscillator tubes.
  • the energies of different frequencies are first generated in master oscillators M1 and M2, and these are separately fed to the tuned input circuits of the amplifiers.
  • the output circuits S1 and S2 are both amplifiers which have been shown coupled to a single antenna A instead of two separate antennas, but, of course, this feature is applicable to either arrangement,
  • a transmission system for reducing the effect of fading comprising a first master oscillator for generating a first frequency, a first space discharge device amplifier circuit having input and ouput circuits tuned to said first frequency adapted to amplify the oscillations generated from said first oscillator, a second master oscillator for generating a second frequency, a second space discharge device amplifier circuit having input and output circuits tuned to said second frequency adapted to amplify the oscillations generated from said first oscillator, an alternating current source coupled in push-pull to the output circuits of said space discharge device amplifiers so that said amplifiers are made operative alternately, and means to radiate the resulting energy from both said amplifiers.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)
US313703A 1927-11-24 1928-10-20 Oscillation generation Expired - Lifetime US1805918A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE301070T 1927-11-24

Publications (1)

Publication Number Publication Date
US1805918A true US1805918A (en) 1931-05-19

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ID=31894287

Family Applications (1)

Application Number Title Priority Date Filing Date
US313703A Expired - Lifetime US1805918A (en) 1927-11-24 1928-10-20 Oscillation generation

Country Status (2)

Country Link
US (1) US1805918A (enrdf_load_stackoverflow)
GB (2) GB301070A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465925A (en) * 1944-05-18 1949-03-29 Rca Corp Radio control system
US2568408A (en) * 1947-05-17 1951-09-18 Rca Corp Frequency shift diversity transmission system
US2722606A (en) * 1946-08-02 1955-11-01 Ollie J Allen Audio frequency pulse generator
US2767258A (en) * 1952-10-10 1956-10-16 North American Aviation Inc Voltage doubling demodulator
US3806925A (en) * 1961-01-26 1974-04-23 Us Navy Countermeasures system
US5303259A (en) * 1991-11-07 1994-04-12 Loveall Peter S Frequency-hopped electronic signal transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2549423A (en) * 1943-09-22 1951-04-17 Rca Corp Reduction of selective fading distortion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465925A (en) * 1944-05-18 1949-03-29 Rca Corp Radio control system
US2722606A (en) * 1946-08-02 1955-11-01 Ollie J Allen Audio frequency pulse generator
US2568408A (en) * 1947-05-17 1951-09-18 Rca Corp Frequency shift diversity transmission system
US2767258A (en) * 1952-10-10 1956-10-16 North American Aviation Inc Voltage doubling demodulator
US3806925A (en) * 1961-01-26 1974-04-23 Us Navy Countermeasures system
US5303259A (en) * 1991-11-07 1994-04-12 Loveall Peter S Frequency-hopped electronic signal transmitter

Also Published As

Publication number Publication date
GB301070A (enrdf_load_stackoverflow) 1929-07-11
GB301326A (en) 1929-03-28

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