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GB998988A - Improvements relating to frequency selective circuits - Google Patents

Improvements relating to frequency selective circuits

Info

Publication number
GB998988A
GB998988A GB4210662A GB4210662A GB998988A GB 998988 A GB998988 A GB 998988A GB 4210662 A GB4210662 A GB 4210662A GB 4210662 A GB4210662 A GB 4210662A GB 998988 A GB998988 A GB 998988A
Authority
GB
United Kingdom
Prior art keywords
tuned
frequency
frequency selective
improvements relating
selective circuits
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
Application number
GB4210662A
Inventor
Douglas Maurice Jones
Harry Duckitt
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.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co Ltd
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 Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Priority to GB4210662A priority Critical patent/GB998988A/en
Priority to FR951473A priority patent/FR1372891A/en
Publication of GB998988A publication Critical patent/GB998988A/en
Priority to FR89230A priority patent/FR94105E/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/221—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using track circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L2003/228—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

998,988. ATC system. WESTINGHOUSE BRAKE & SIGNAL CO. Ltd. Oct. 3, 1963 [Nov. 7, 1962], No. 42106/62. Heading B7H. In an A.T.C. system, code modulated signalling current in track 4 is picked up by coils L1 on the train which are tuned to the signalling current frequency by capacitor C1, and applied via amplifier 5 to a Zener diode rectifier bridge 6 which supplies the coded signal to a number of units 7, each selectively tuned to a different code frequency and connected to a decoding relay 8. Each unit 7 comprises a filter L2, C2, tuned to a code frequency, and a magnetic amplifier T1 including a control winding connected to the filter output and an A.C. winding connected in series with A.C. source 9 and the primary of transformer T2. The transformer secondary is connected to decoding relay 8 via a rectifying circuit D1, D2.
GB4210662A 1962-11-07 1962-11-07 Improvements relating to frequency selective circuits Expired GB998988A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4210662A GB998988A (en) 1962-11-07 1962-11-07 Improvements relating to frequency selective circuits
FR951473A FR1372891A (en) 1962-11-07 1963-10-23 Advanced Frequency Selective Response Circuits
FR89230A FR94105E (en) 1962-11-07 1966-12-28 Improvements to frequency selective response circuits.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4210662A GB998988A (en) 1962-11-07 1962-11-07 Improvements relating to frequency selective circuits

Publications (1)

Publication Number Publication Date
GB998988A true GB998988A (en) 1965-07-21

Family

ID=10422874

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4210662A Expired GB998988A (en) 1962-11-07 1962-11-07 Improvements relating to frequency selective circuits

Country Status (2)

Country Link
FR (1) FR1372891A (en)
GB (1) GB998988A (en)

Also Published As

Publication number Publication date
FR1372891A (en) 1964-09-18

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