US2284706A - Arrangement for the transmission of intelligence - Google Patents

Arrangement for the transmission of intelligence Download PDF

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Publication number
US2284706A
US2284706A US285045A US28504539A US2284706A US 2284706 A US2284706 A US 2284706A US 285045 A US285045 A US 285045A US 28504539 A US28504539 A US 28504539A US 2284706 A US2284706 A US 2284706A
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US
United States
Prior art keywords
frequency
carrier
transmission
modulation
kilocycles
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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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US285045A
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English (en)
Inventor
Wiessner Alfred
Hagen Wolfgang
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.)
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Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
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Publication of US2284706A publication Critical patent/US2284706A/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces

Definitions

  • This invention relates to carrier frequency communication systems,.and more specifically to systems in which signals of 'different kind are radiated over relaying stations as 'directed ultrashort waves.
  • ⁇ means which allow the entire number of intermediate modulation frequencies required in the transmission andthe receiving equipment to be derived directly or by frequency multiplication from one single oscillator, the frequency of which may be exactly adjusted to any predetermined value.
  • the several required intermedate frequencies may be so chosen that they are harmonics of the same fundamental frequency, which frequency may be generated by a single oscillator.
  • the system embodied in this figure is adapted to transmit three different kinds of messages which, for example, may be impressed upon the transmitting equipmentfrom a telephone set I, a telegraph apparatus 2 and a printing telegraph device 3.
  • these different message currents are radiated from a transmitter 4 as a directed ultra-short wave beam which is picked up by the receiver of the succeeding relay station (not shown).
  • Incoming ultra-short wave signals are picked up by a receiver 5 and then applied to electric filters and demodulating drawing 4may be asfollows.
  • a carrier frequency assumed for illustrative purposes to be 8 kilocycles, generated by an oscillator G.
  • the modulation stage one of the wellknown push-pull circuits Vmay be usedv in which the suppression of .the carrier takes place'.
  • the lower of the two sidebands produced in this modulation -stage will, for instance, in transmitting a frequency bandwidth of 300 to 3,000 cycles, be a band comprising 5 to 7.7 kilocycles, passing through a filter Fm of arsecond modulating stage, in which it is again 'modulated with a carrier frequency of 24 kilocycles, which is obtained by multiplication in the apparatus VI of the fundamental frequency of 8' kilocycles.
  • This modulation stage likewise suppresses only the carrier.
  • the lower sideband, 16.3 to 19 kilocycles, remaining from these two modulation stages will pass through a low-pass filter Ta, an amplifier Va and a band-pass filter BA to the transmitter 4.
  • the receiver which picks up the reverse traffic signals, preferably of another decimeter magnitude wavelength, although employing the same intermediate frequencies,V
  • a two-Way carrier frequency station in which a plurality of different signal messages are transmitted and received by use of doubly modulated carrier channels, the signal messages being transmitted on different respective frequencies as single sidebands, the transmitting branch comprising a single carrier wave generator, a plurality of first modulators, means for applying to each fof said first modulators carrier Waves from said v single generator and signal Waves constituting tively.
  • messages incoming to the receiver may therefore be derived from the secondaries of these demodulation stages, be maintained separated one from another by the lters F and be applied to their respective apparatus over the terminal strip 6 So/ that each-of the sets l, 2, 3 may accomplish two-way communi-k cation.
  • Two-stage modulation is employed because the two sidebands may be more easily separated by suitablelow-'and high-pass'filters in a 10W modulating stage than in a higher frequency stage, which-necessarily involves more complicated and more .expensive equipments.
  • All carrier frequencies areY harmonics of a single fundamental frequency so that they may be fed from one oscillator G which must be exactly stabilized.
  • the use of the same generator for transmitting as Well as for the receiving equipment involves the further advantage that the receiving equipment'with poor reception and lack of syn-V one of said plurality of different signal messages, means for selecting a single sideband from the output of each of said first modulators, means for deriving higher frequencies from said carrier Wave generator, a plurality of second modulators, means for applying to each of said second modu- 4-lators one of said derived higher frequencies and theoutput of each of said second modulators, andVV a common transmitter for transmitting said selected single sidebands, and the receiving branch comprising a'common receiver for receiving a plurality of single sideband Waves, means for segregating said received single sidebandwaves, first demodulators for said received sidebands, means for applying said derived higher frequencies to said first demodulators, second demodulatcrs and means for applying energy from said single generator and from said first demodulators to said second demodulators to derive the received signal messages therefrom, the modulated energy applied to said second modulators and the modulated energy applied

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
US285045A 1938-07-19 1939-07-18 Arrangement for the transmission of intelligence Expired - Lifetime US2284706A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE212076X 1938-07-19

Publications (1)

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US2284706A true US2284706A (en) 1942-06-02

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ID=5806163

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Application Number Title Priority Date Filing Date
US285045A Expired - Lifetime US2284706A (en) 1938-07-19 1939-07-18 Arrangement for the transmission of intelligence

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US (1) US2284706A (de)
CH (1) CH212076A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653315A (en) * 1951-02-20 1953-09-22 Rca Corp Frequency control system for microwave relay terminal stations
US2670404A (en) * 1949-12-02 1954-02-23 Radio Electr Soc Fr Multichannel radioelectric communication system
US2722682A (en) * 1951-06-08 1955-11-01 American Telephone & Telegraph Two-way single sideband radio system
US2819344A (en) * 1952-07-28 1958-01-07 Rca Corp Frequency division multiplexing
US4959827A (en) * 1989-03-30 1990-09-25 Laser Communications, Inc. Laser signal mixer circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2670404A (en) * 1949-12-02 1954-02-23 Radio Electr Soc Fr Multichannel radioelectric communication system
US2653315A (en) * 1951-02-20 1953-09-22 Rca Corp Frequency control system for microwave relay terminal stations
US2722682A (en) * 1951-06-08 1955-11-01 American Telephone & Telegraph Two-way single sideband radio system
US2819344A (en) * 1952-07-28 1958-01-07 Rca Corp Frequency division multiplexing
US4959827A (en) * 1989-03-30 1990-09-25 Laser Communications, Inc. Laser signal mixer circuit

Also Published As

Publication number Publication date
CH212076A (de) 1940-10-31

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