US2203316A - High frequency system - Google Patents

High frequency system Download PDF

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Publication number
US2203316A
US2203316A US194555A US19455538A US2203316A US 2203316 A US2203316 A US 2203316A US 194555 A US194555 A US 194555A US 19455538 A US19455538 A US 19455538A US 2203316 A US2203316 A US 2203316A
Authority
US
United States
Prior art keywords
high frequency
frequency
circuits
frequency system
attenuation
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
US194555A
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English (en)
Inventor
Wiessner Alfred
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 US2203316A publication Critical patent/US2203316A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
    • A01F12/00—Parts or details of threshing apparatus
    • A01F12/44—Grain cleaners; Grain separators
    • A01F12/446—Sieving means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/20—Arrangements affording multiple use of the transmission path using different combinations of lines, e.g. phantom working

Definitions

  • Vl follows that transmission becomes impossible above agiven frequency range.
  • Fig. 1 diagrammatically illustrates different A curves of attenuation in response to frequency
  • Fig. 2 is a diagrammatical representation of an arrangement according to the invention.
  • the continuous curve I shows .the attenuation of a two-conductor line of a cable which is employed for high frequency intelligence transmission.
  • the attenuation is plotted in dependency upon frequency. It is a well known measure 'to combine the two-conductor lines of a cable to phantom circuits (fourwlre units, eight-wire units and the like) in order to provide a larger number vof channels for the low frequency message transmission and to employ these channels for message transmission independently of the side or component circuits.
  • phantom circuits fourwlre units, eight-wire units and the like
  • the dashed curve II of Fig. 1 shows an attenuation curve which has been obtained in a test with side circuits combined to a four-wire unit, for example.
  • the frequency of the alternating carrier currents traveling along the side circuits is then located in the range between the points a 10 and b of the frequency spectrum, while the frequency range between the points c and d is employed for transmission along the combined side circuits.
  • Two two-wire lines AB and CD of a high frequency conduction cable associated with the repeaters I, 2, 3 and 4 are-connected as a phantom circuit through the repeaters 5 and 6.
  • the message transmission is effected over this cir- 20 cuit at a frequency which is higher than that of the side circuits, so that cross-talk freedom is l not necessarily required between the four-wire units and said circuits, on the contrary, the alternating message currents may be separated in 25 filter devices or the like according to any known methods. It is possible to combine four-wire units to eight-wire units in the same manner as above described.
  • the method of message transmission over physical cable pairs utilizing high frequency oscillations which includes the steps of connecting the cable pairs in phantom, impressing high freoscillations'at which said upper frequency the 40 side lines approach maximum attenuation.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Transmitters (AREA)
  • Radar Systems Or Details Thereof (AREA)
US194555A 1937-03-12 1938-03-08 High frequency system Expired - Lifetime US2203316A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201774X 1937-03-12

Publications (1)

Publication Number Publication Date
US2203316A true US2203316A (en) 1940-06-04

Family

ID=5768008

Family Applications (1)

Application Number Title Priority Date Filing Date
US194555A Expired - Lifetime US2203316A (en) 1937-03-12 1938-03-08 High frequency system

Country Status (5)

Country Link
US (1) US2203316A (en))
CH (1) CH201774A (en))
FR (1) FR834987A (en))
GB (1) GB493822A (en))
NL (2) NL86737B (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173714A (en) * 1977-06-03 1979-11-06 Tie/Communications, Inc. Communication circuit with combined power feed and data transmission over a phantom channel
WO1984002627A1 (en) * 1982-12-22 1984-07-05 Gen Datacomm Ind Inc Secondary channel method and apparatus
EP0345985A3 (en) * 1988-06-06 1991-08-28 Tandem Computers Incorporated Communication circuit connection
US20090321079A1 (en) * 2006-07-08 2009-12-31 Vetco Gray Contrls Limited Power line communication system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4173714A (en) * 1977-06-03 1979-11-06 Tie/Communications, Inc. Communication circuit with combined power feed and data transmission over a phantom channel
WO1984002627A1 (en) * 1982-12-22 1984-07-05 Gen Datacomm Ind Inc Secondary channel method and apparatus
EP0112716A3 (en) * 1982-12-22 1987-06-24 General Datacomm Industries, Inc. Secondary channel method and apparatus
EP0345985A3 (en) * 1988-06-06 1991-08-28 Tandem Computers Incorporated Communication circuit connection
AU623885B2 (en) * 1988-06-06 1992-05-28 Tandem Computers Incorporated Communication circuit matrix connection
US20090321079A1 (en) * 2006-07-08 2009-12-31 Vetco Gray Contrls Limited Power line communication system

Also Published As

Publication number Publication date
FR834987A (fr) 1938-12-08
NL51746C (en))
NL86737B (en))
CH201774A (de) 1938-12-15
GB493822A (en) 1938-10-14

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