US1868691A - Signaling system - Google Patents

Signaling system Download PDF

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Publication number
US1868691A
US1868691A US402774A US40277429A US1868691A US 1868691 A US1868691 A US 1868691A US 402774 A US402774 A US 402774A US 40277429 A US40277429 A US 40277429A US 1868691 A US1868691 A US 1868691A
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US
United States
Prior art keywords
circuit
relay
current
resistance
signaling system
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
US402774A
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English (en)
Inventor
Archibald S Brown
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.)
Federal Telegraph Co
Original Assignee
Federal Telegraph 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 BE373478D priority Critical patent/BE373478A/xx
Application filed by Federal Telegraph Co filed Critical Federal Telegraph Co
Priority to US402774A priority patent/US1868691A/en
Priority to GB17631/30A priority patent/GB355852A/en
Application granted granted Critical
Publication of US1868691A publication Critical patent/US1868691A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Definitions

  • This invention relates generally to relay systems and has particular application to radio telegraph transmitting systems.
  • the specific object underlying the invention is to increase the rapidity of operation of a telegraph repeating relay without subjecting the relay winding to excessive current for long enough time to overheat it.
  • tungsten filament lamp which has a relatively low resistance when cold and permits a large initial rush of current through the relay winding, but which has suflicient resistance when hot to limit the current to a safe value.
  • the drawing discloses a schematic circuit of a carrier telegraph system for generating continuous oscillations in response to closure of a telegraph key.
  • the oscillation circuit includes a three electrode vacuum tube 10, having a cathode, grid, and anode.
  • the input circuit of tube 10 includes an inductance 14 and the contacts 23 of a keying relay 80, and the output circuit thereof includes an inductance 16 shunted by a tuning condenser 17.
  • A. load circuit 19, which may be an antenna or a transmission line, is coupled to inductance 16, by inductance 21.
  • the circuit described is designed for operation at short waves at which suflicient energy is transferred from the output circuit to the input circuit through the grid-anode capacity of the tubes to cause continuous oscillations whenever contacts 23 are closed.
  • the keying circuit for closing contacts 23 includes a key 24, a tungsten filament lamp 44, relay winding 30, and battery 26 connected in series.
  • a control circuit of this type is desirable as it permits placing the contacts 23 close to inductance 14 and tube 10, while having key 24 at a remote point more convenient to the operator. With such a system of control it is desirable that relay 23 operate quickly in response to a closure of key 24. Since, due to the heavy insulation and current carrying requirements of the contacts, the relay is sometimes of comparatively massive construction, a heavy initial surge of current is necessary to obtain the desired quick operation. To obtain a heavy current the resistance of the relay winding is made very low and a tungsten filament lamp 44 is inserted in the circuit.
  • the resistivity of tungsten when heated to incandescence is several times as great as that of cold tungsten.
  • the lamp 44 therefore permits a large initial surge of current and thereafter, due to its increased resistance when heated, limits the current in the circuit to a safe value.
  • tungsten filament lamp other resistance devices having large, positive, temperature-resistivity coefiicients may be substituted therefor, and the invention is limited in this respect only to the extent indicated in the claims.
  • a relay in a relay system, a relay, a source of current, a resistance element having a positive temperature coefficient, and a keying device, all connected in series, said resistance element being so proportioned relative to the total circuit resistance as to be heated, in response to closure of said contact means, to a temperature at which its resistance constitutes a major proportion of the total circuit resistance.
  • a relay and an operating circuit therefor including a source of current, a keying device, and a current limiting resistance element comprising a lamp having a positive temperature-resistivity coeflicient.
  • a telegraph repeating relay and an operating circuit therefor including a source of current, a keying device, and a current limiting resistor comprising a tungsten filament lamp, said lamp being adapted to be heated by the normal current in said circuit to a temperature at which its resistance is greatly increased.
  • a series circuit including a relay, a source of current, a keying device, and means for limiting the steadystate current in said circuit comprising a resistance element having a large positive, temperature-resistivity coefficient, which element, when cold has a resistance low as compared to the impedance of the remainder of the circuit but which heats in response to current flowing therethrough to a temperature at which its resistance is large relative to the resistance of the remainder of the circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Near-Field Transmission Systems (AREA)
US402774A 1929-10-26 1929-10-26 Signaling system Expired - Lifetime US1868691A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE373478D BE373478A (enrdf_load_stackoverflow) 1929-10-26
US402774A US1868691A (en) 1929-10-26 1929-10-26 Signaling system
GB17631/30A GB355852A (en) 1929-10-26 1930-06-06 Improvements relating to radio or other telegraph transmitting systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US402774A US1868691A (en) 1929-10-26 1929-10-26 Signaling system

Publications (1)

Publication Number Publication Date
US1868691A true US1868691A (en) 1932-07-26

Family

ID=23593258

Family Applications (1)

Application Number Title Priority Date Filing Date
US402774A Expired - Lifetime US1868691A (en) 1929-10-26 1929-10-26 Signaling system

Country Status (3)

Country Link
US (1) US1868691A (enrdf_load_stackoverflow)
BE (1) BE373478A (enrdf_load_stackoverflow)
GB (1) GB355852A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305718A (en) * 1963-09-19 1967-02-21 Bosch Arma Corp Switch control system for permanent magnet motors and the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305718A (en) * 1963-09-19 1967-02-21 Bosch Arma Corp Switch control system for permanent magnet motors and the like

Also Published As

Publication number Publication date
GB355852A (en) 1931-09-03
BE373478A (enrdf_load_stackoverflow)

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