US1982771A - High frequency wave modulation - Google Patents

High frequency wave modulation Download PDF

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Publication number
US1982771A
US1982771A US576850A US57685031A US1982771A US 1982771 A US1982771 A US 1982771A US 576850 A US576850 A US 576850A US 57685031 A US57685031 A US 57685031A US 1982771 A US1982771 A US 1982771A
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United States
Prior art keywords
ultra
high frequency
short wave
frequencies
waves
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Expired - Lifetime
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US576850A
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English (en)
Inventor
Ardenne Manfred Von
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RADIOAG D S LOWE
RADIOAKTIENGESELLSCHAFT D S LOWE
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RADIOAG D S LOWE
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/08—Transmission systems not characterised by the medium used for transmission characterised by the use of a sub-carrier
    • 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

  • Patented Dec. 4, 1934 UNITED STATES HIGH FREQUENCY WAVE MODULATION Manfred von Ardenne, Berlin, Germany, assignor to Radioaktiengesellschaft D. S. Lowe, Berlin- Steglitz, Germany, a company of Germany Application November 23, 1931, Serial No. 576,850 In Germany November 22, 1930 Claims.
  • the present invention dealswith the question of utilizing the selective properties of normal radio receivers for separating a plurality of ultra-short wave senders, and thus avoiding the necessity of providing particularly effective selecting means in the requisite ultra-short wave auxiliary apparatus.
  • the ultra-short wave senders were each modulated with 3 high frequencies, each high frequency is modulated by a program, (it may also be the .Isame three programs), the different high frequencies, according to the additional subject matter of the invention, are intended to be distributed in such fashion over the available interval, for example 300-600 m., that even in the .”case when the different ultra-short wave senders are demodulated simultaneously by a simple, non-selective auxiliary apparatus, there are no disturbances, or merely a minimum thereof. This is the case if the high frequencies are dis .tributed evenly over the wave range.
  • Disturbances may also occur in connection with multiple broadcasting of this nature over the plurality of ultra-short wave transmitters when the deviations of the ultra-waves reach such a level that the resultant difference frequencies fall within the high frequency range employed, for example 300-600 in.
  • the ultra-short wave transmitters S1, S2, S2 will preferably be so modulated that one ultra-short wave transmitter is modulated by the waves A1, A4, A7, the second by A2, A5, A8, and the third by the waves A3, A6, A9.
  • the threepr'ograms are then preferably distributed in such fashion over the single waves that the one program is carried by the waves A1, A2 and As, the second by the waves A4, A5 and A6, and the third by the waves A7, A8 and A9.
  • the invention may be employed not only in respect of speech or tone modulated high frequencies, but also for high frequency bands, such as are frequently used, for example, in connection with television.
  • the high frequency bands are then preferably transferred in unitary fashion either to the higher or to the lower parts of the high frequency range to be transmitted.
  • Fig. 1 the high frequency generators the waves of which are to be transmitted are designated A1, A2, A3, A4, A5,'As, A7, A3, A9, viz, in the order of their wave lengths.
  • S1, S2, S3 are three ultra-short wave. transmitters, which are controlled by the high frequency generators A1, A4 and A7, A2, A5 and A8, and A2, A6 and A9 respectively.
  • Fig. 2 shows a possible form of embodiment of a transmission system of this nature. It is assumed, for example, that the oscillatory circuits l and 2 of the transmission tubes oscillate in the frequencies A2, A5 and As.
  • the three generators. are modulated according to one of the known modulation systems, for example according to the principle of the parallel tube control.
  • the parallel tubes 4 are controlled by a microphone 6 or similar elements through the medium of a repeater 5, and thus modulate the high frequency generator.
  • the three high frequency generators x2, A5 and Ms control through the medium of coupling coils '7 a modulating valve 8, which is situated in the grid circuit of the short-wave transmitter tube 9.
  • an oscillatory circuit 10 which passes the modulated ultra-short wave energy to the radiating system (aerial ll).
  • ing batteries, 13 the anode batteries, 14 the initial grid voltage batteries and 15 the microphone batteries. 16 are the high frequency, and 1'7 the low frequency chokes.
  • two or more'ultra-short wave transmitters means for generating several groups of intermediate frequencies, means for modulating each of said groups by the same program, each of said ultra-short wave transmitters being modulated by one intermediate frequency of each of said several groups of intermediate frequencies.
  • two or more ultra-short wave transmitters means for generating several groups of intermediate frequencies, means for modulating each of said groups by the same program, each of said ultra-short wave transmitters being modulated by one intermediate frequency of each of said several groups of intermediate fre- 12 are the various heatquencies, the frequencies of said ultra-short wave transmitters differing from each other to such extent, that the difference frequencies are situated outside the range of the modulating high frequency bands.
  • two or more ultra-short wave transmitters means for generating several groups of intermediate frequencies, means for modulating each of said groups by the same program, each of said ultra-short wave transmitters being modulated by one intermediate frequency of each of said several groups of intermediate frequencies, said groups of intermediate frequencies, limited to and distributed over the range of a single octave, whereby the wave, corresponding with the octave, remains unemployed.
  • two or more ultra-short wave transmitters means for generating several groups of intermediate frequencies, means for modulating each of said groups by the same program, each of said ultra-short wave transmitters being modulated by one intermediate frequency of each of said several groups of intermediate frequencies, said intermediate frequencies distributed to said groups in such a manner that the intermediate frequencies in each group, for transmitting the same program, difiering from each other to the greatest possible extent.
  • two or more ultra-short wave transmitters means for generating several groups of intermediate frequencies, means for modulating each of said groups by the same pro-- gram, the intermediate frequencies modulated by the same program being the nearest to each other, each of said ultra-short wave transmitters being modulated by one intermediate frequency of each of said several. groups of intermediate frequencies, said intermediate frequencies distributed to said groups in such a manner that the intermediate frequencies in each group, for transmitting the same program, differing from each other to the greatest possible extent.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)
US576850A 1930-11-23 1931-11-23 High frequency wave modulation Expired - Lifetime US1982771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE682789T 1930-11-23

Publications (1)

Publication Number Publication Date
US1982771A true US1982771A (en) 1934-12-04

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ID=6320309

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US576850A Expired - Lifetime US1982771A (en) 1930-11-23 1931-11-23 High frequency wave modulation

Country Status (5)

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US (1) US1982771A (fr)
BE (1) BE384321A (fr)
DE (1) DE682789C (fr)
GB (1) GB370351A (fr)
NL (1) NL37403C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2979706A (en) * 1956-07-02 1961-04-11 Avery H Simon Radio warning system
US3462688A (en) * 1967-04-10 1969-08-19 William E Abel Communication system for classroom use and the like

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532719A (en) * 1944-10-16 1950-12-05 John H Homrighous Dimensional radio communication system
US2979706A (en) * 1956-07-02 1961-04-11 Avery H Simon Radio warning system
US3462688A (en) * 1967-04-10 1969-08-19 William E Abel Communication system for classroom use and the like

Also Published As

Publication number Publication date
GB370351A (en) 1932-04-07
BE384321A (fr)
NL37403C (fr)
DE682789C (de) 1939-10-21

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