US1696595A - High-frequency duplex signaling system - Google Patents

High-frequency duplex signaling system Download PDF

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Publication number
US1696595A
US1696595A US5148A US514825A US1696595A US 1696595 A US1696595 A US 1696595A US 5148 A US5148 A US 5148A US 514825 A US514825 A US 514825A US 1696595 A US1696595 A US 1696595A
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US
United States
Prior art keywords
circuit
oscillator
grid
current
oscillations
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
US5148A
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English (en)
Inventor
Emmett F Carter
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to BE359027D priority Critical patent/BE359027A/fr
Priority to BE331755D priority patent/BE331755A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US5148A priority patent/US1696595A/en
Priority to DER66405D priority patent/DE522801C/de
Priority to FR31534D priority patent/FR31534E/fr
Priority to FR35156D priority patent/FR35156E/fr
Priority to FR36052D priority patent/FR36052E/fr
Application granted granted Critical
Publication of US1696595A publication Critical patent/US1696595A/en
Priority to FR36652D priority patent/FR36652E/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising

Definitions

  • My present invention relates to signaling systems adapted to duplex operation, and more particularly to high frequency signaling systems of the carrier current type.
  • c- 011s of the objects of my invention is to provide a system whereby duplex operation may be carried on by the use of a single high frequency for the carrier currents transmitted in both directions.
  • Still another object of my invention is to provide means whereby both a transmitting apparatus and a sensitive receiving apparatus may be simultaneously coupled to a signaling circuit without injury to the receiving apparatus when the transmitting apparatus is in operation.
  • .nsmitting apparatus comprises a ctrode electron discharge tube 2, -ich serves as a generator of oscillations,
  • an amplifying tube 8 which serves to amplilty the oscillations produced by tube 2
  • a mod ulatin tube 4- serves to modulate the amplified oscillations of tube 3
  • an amplit'ying tube 5 for amplifying speech currents produced by telephone transformer 6 and supplying the amplified speech currents to the input or control circuit of modulator 4, and control tubes 1 and 8 for controlling the operation of oscillator 2.
  • Plate Anotherobject of my invention is to 1'0 plate circuit of control tube 7 includes the resistance 17, which is also included in the grid circuit of oscillator 2.
  • the plate circuit of tube 8 includes a resistance 18, a portion of vvlgicl; is connected in the grid circuit of 'lhe grids of modulator tube ei'and control tube 8 are connected together and are normally biased negatively by the source 19. When no signaling current is impressed upon the system the voltage of the source 19 is so chosen that substantially no current will flow in the plate circuit of tube 8.
  • the grid of tube 7 will be of substantially cathode potential and current will flow in the plate circuit of tube 7 of such a value as to reduce a voltage drop through resistance l of such value as to provide a negative bias on the grid of oscillator 2 high enough to prevent the production oi oscillations.
  • the condensers 21 22 While the plate circuits of tubes 7 and 8 are supplied with alternating potential, the condensers 21 22 have suflicient storage capacity to prevent the voltages applied to the grids of tubes 2 and 7 falling at any time below the cutod value. By means of these condensers the potential on the grid of the device 2 is smoothed appropriately to prevent any substantial modulation of the currents loll lOh
  • alternating current source 9 is of a frequency about equal to the normal voice frequency and that transmission starts at almost the same instant that a signaling current starts in the microphone.
  • the receiving circuit may be coupled to the transmitting circuit through a coupling transformer 23, the secondary of which'is included in a tuned link circuit 24.
  • This link circuit is coupled to a tuned circuit 25, which may be connected to any desired form ofreceiver.
  • I provide in shunt to the link circuit 24., a path which oifers a substantially infinite impedance to thereceived currents, but a comparatively low impedance to currents impressed upon the link circuit 18 from the transmitting apparatus.
  • This device as indicated in the drawing consists of an electron discharge tube 26 having its grid and anode connected together and made slightly negative by battery 27. When signaling currents are being received the impedance of tube 26 is practically infinite; hence, the operation of the receiving system is not interfered with in any way.
  • a control device for said oscillator comprising means for normally providing a ne ative bias on the grid of said oscillator sufficient to prevent the production of oscillations and means responsive to an audio frequency signaling current for reducing the negative bias to a value at which oscillations will be produced, the bias potential being sufiiciently smoothed substantially to prevent modulation by voice currents of the oscillations produced.
  • a control device for said oscillator comprising means comprising a second electron discharge device for normally providing a negative bias on the grid of said oscillator sufiicient to prevent the production of oscillations and means responsive to signaling current for controlling the current through said second device and thereby reducing the negative bias of the oscillator grid to a value at which oscillations will be produced, the bias potential being sufficiently smoothed substantially to prevent modulation by voice currents of the oscillations produced.
  • a transmitting apparatus for a high frequency signaling system comprising an electron discharge oscillator, a second electron discharge device having included in its plate circuit a resistance which is included in the grid circuit of the oscillator, said second device being normally so adjusted that the current flowing in its plate circuit will produce a negative bias on the grid of the oscillator sufficient to prevent the production of oscillations and means responsive to. signaling current for controlling the current through said second device and thereby reducing the negative bias of the oscillator grid to' a value at which oscillations will be produced, the bias potential being sufficiently smoothed substantially to prevent modulation by voice currents of the oscillations produced.
  • a transmitting apparatus for a high frequency signaling system comprising an electron discharge oscillator, means comprising a second electron discharge device for normally providing a negative bias on the grid of the oscillator sufiicient to prevent the production of oscillations and a third electron discharge device for controlling the current through the second device and thereby reducing the negative bias of the oscillator grid to a value at which oscillations will be produced, said third device being controlled in its action by the signaling current to be transmitted.
  • a transmitting apparatus for a high frequency signaling system comprising an electron discharge oscillator, a second electron discharge device having included in its plate circuit a resistance which is included in the grid circuit of the oscillator, said second device being normally so adjusted that the current flowing in its plate circuit will produce a negative bias on the grid of the oscillator sufficient to prevent the production of oscillations, and a third electron discharge device for controlling the current through the second device and thereby reducing the negative bias of the oscillator grid to a value at which oscillations will be produced, said third device being controlled in its action by the signaling current to be transmitted.
  • a transmitting apparatus for a high frequency signaling system comprising an electron discharge oscillator, a second electron discharge device having included in its late circuit a resistance which is included in the grid circuit of the'oscillator, said second device being normally so adjusted that the current flowing in its plate circuit will produce a negative bias on the grid of the oscillator sufficient to prevent the production of oscillations, and a third electron dis charge device having included in its plate circuit a resistance which is also included in the grid circuit of the second device, said third device being controlled by the signaling current to be transmitted in such a way that application of the signaling current thereto will cause the negative bias of the oscillator grid to be reduced to a value at which oscillations will be produced.
  • a transmitting apparatus for a high frequency signaling system comprising an electron discharge oscillator, a second electron discharge device havin included in its plate circuita resistance w ich is included in the grid circuit of the oscillator, said sec-- ond device being normally so adjusted that the current fiowin in its plate circuit will produce a negative ias on the grid of the oscillator suflicient prevent the production of oscillations, and a third electron discharge device having included in its plate circuit a resistance which is also included in the grid circuit of the second device, said third device having its grid normally biased to a negative value suflicient to substantially prevent the flow of current in its plate circuit and being controlled by the signaling corrent to be transmitted in such a way that the application of a signaling current thereto'will cause the negative bias of the oscillator grid to be reduced to a value at which oscillations will be produced.
  • a transmitting apparatus for a high frequency signaling system comprising 'an electron discharge oscillator, a second electron discharge device having included in its plate circuit a resistance which is included in the grid circuit of the oscillator, said second device being normally so adjusted that the current flowing in its plate circuit will produce a negative bias on the grid of the oscillator sufiicient to prevent the production of oscillations, and a third electron discharge device having included in its plate circuit a resistance which is also included in the grid circuit of the second device, said third device having its grid normally biasedto a negative value sufiicient to substantially prevent the flow of current in its plate circuit and being controlled b the signaling current to be transmitted 1n such a way that application of the signaling current thereto Wlll cause a negative bias to be produced on the grid of the second device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Amplifiers (AREA)
US5148A 1924-11-25 1925-01-27 High-frequency duplex signaling system Expired - Lifetime US1696595A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BE359027D BE359027A (US06262066-20010717-C00424.png) 1924-11-25
BE331755D BE331755A (US06262066-20010717-C00424.png) 1925-01-27
US5148A US1696595A (en) 1925-01-27 1925-01-27 High-frequency duplex signaling system
DER66405D DE522801C (de) 1925-01-27 1926-01-08 Schaltung zum wechselweisen Sende- und Empfangsverkehr
FR31534D FR31534E (fr) 1924-11-25 1926-01-23 Perfectionnements aux systèmes de signalisation
FR35156D FR35156E (fr) 1924-11-25 1928-01-13 Perfectionnements aux systèmes de signalisation
FR36052D FR36052E (fr) 1924-11-25 1928-10-19 Perfectionnements apportés à la signalisation
FR36652D FR36652E (fr) 1924-11-25 1929-03-15 Perfectionnements aux systèmes de signalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5148A US1696595A (en) 1925-01-27 1925-01-27 High-frequency duplex signaling system

Publications (1)

Publication Number Publication Date
US1696595A true US1696595A (en) 1928-12-25

Family

ID=21714424

Family Applications (1)

Application Number Title Priority Date Filing Date
US5148A Expired - Lifetime US1696595A (en) 1924-11-25 1925-01-27 High-frequency duplex signaling system

Country Status (3)

Country Link
US (1) US1696595A (US06262066-20010717-C00424.png)
BE (1) BE331755A (US06262066-20010717-C00424.png)
DE (1) DE522801C (US06262066-20010717-C00424.png)

Also Published As

Publication number Publication date
BE331755A (US06262066-20010717-C00424.png)
DE522801C (de) 1931-04-15

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