GB974469A - Improvements in apparatus for the remote control of equipment - Google Patents

Improvements in apparatus for the remote control of equipment

Info

Publication number
GB974469A
GB974469A GB709360A GB709360A GB974469A GB 974469 A GB974469 A GB 974469A GB 709360 A GB709360 A GB 709360A GB 709360 A GB709360 A GB 709360A GB 974469 A GB974469 A GB 974469A
Authority
GB
United Kingdom
Prior art keywords
frequencies
feb
pulses
threshold
stable circuit
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
GB709360A
Inventor
David Reginald Ollington
Neville Leigh Ayres
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.)
Venner Ltd
Original Assignee
Venner 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 Venner Ltd filed Critical Venner Ltd
Priority to GB709360A priority Critical patent/GB974469A/en
Publication of GB974469A publication Critical patent/GB974469A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)

Abstract

974,469. Electric selective signalling systems. VENNER Ltd. Feb. 28,1961 [Feb. 29, 1960], No. 7093/60. Heading G4H. A selective signalling system comprises a radio transmitter which transmits a carrier wave which may be modulated with pulses of one of two audio frequencies ("on" and "off" frequencies) and each remote location e.g. street lamps, controlled by the transmitter, comprises a transistorized receiver which includes two amplifiers tuned to the respective audio frequencies and feeding respective rectifiers whose outputs are connected to respective circuits for converting the received pulses into a voltage which increases step-bystep with each pulse supplied thereto, and which control a bi-stable circuit through respective threshold devices connected to the two halves of the bi-stable circuit. The arrangement is such that the input to a threshold device only rises to the threshold level if the number, repetition frequency, or mark-space ratio of received pulses of the corresponding audio frequency exceeds a predetermined value.
GB709360A 1960-02-29 1960-02-29 Improvements in apparatus for the remote control of equipment Expired GB974469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB709360A GB974469A (en) 1960-02-29 1960-02-29 Improvements in apparatus for the remote control of equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB709360A GB974469A (en) 1960-02-29 1960-02-29 Improvements in apparatus for the remote control of equipment

Publications (1)

Publication Number Publication Date
GB974469A true GB974469A (en) 1964-11-04

Family

ID=9826483

Family Applications (1)

Application Number Title Priority Date Filing Date
GB709360A Expired GB974469A (en) 1960-02-29 1960-02-29 Improvements in apparatus for the remote control of equipment

Country Status (1)

Country Link
GB (1) GB974469A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215892A (en) * 1988-03-25 1989-09-27 Pico Electronics Ltd Remote control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215892A (en) * 1988-03-25 1989-09-27 Pico Electronics Ltd Remote control

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