GB356584A - Improvements in or relating to high frequency signalling systems - Google Patents

Improvements in or relating to high frequency signalling systems

Info

Publication number
GB356584A
GB356584A GB35885/30A GB3588530A GB356584A GB 356584 A GB356584 A GB 356584A GB 35885/30 A GB35885/30 A GB 35885/30A GB 3588530 A GB3588530 A GB 3588530A GB 356584 A GB356584 A GB 356584A
Authority
GB
United Kingdom
Prior art keywords
fork
synchronism
valves
grids
supplying
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
GB35885/30A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB356584A publication Critical patent/GB356584A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2275—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses the received modulated signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

356,584. Converting. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London, and HANSELL, C. W., Port Jefferson, Long Island, New York, U.S.A. Nov. 28, 1930, No. 35885. Convention date, Dec. 23, 1929. [Class 38 (ii).] By warying inductance.-A tuning-fork oscillation generator for use in a wireless receiving circuit comprises a fork 76 maintained in vibration by magnet coils 72, 74 which are in the grid and plate circuits of a valve 70. Synchronism between the fork and an incoming wave is effected by supplying the fork-produced oscillation through a frequency doubler 66 to the grids of two valves 60, 62, and by supplying the incoming wave through a frequency doubler 48 to the plate circuits of the same pair of valves 60, 62. The grids are excited in phase agreement, and the plates in phase opposition or vice versa. The plate supply circuits of these valves include coils 80, 82 on a magnet 78 which, on the occurrence of a departure from synchronism, acts on the fork to restore synchronism.
GB35885/30A 1929-12-23 1930-11-28 Improvements in or relating to high frequency signalling systems Expired GB356584A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US356584XA 1929-12-23 1929-12-23

Publications (1)

Publication Number Publication Date
GB356584A true GB356584A (en) 1931-09-10

Family

ID=21884006

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35885/30A Expired GB356584A (en) 1929-12-23 1930-11-28 Improvements in or relating to high frequency signalling systems

Country Status (1)

Country Link
GB (1) GB356584A (en)

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