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GB1043747A - Improvements in or relating to frequency shift telegraphy electric oscillator arrangements - Google Patents

Improvements in or relating to frequency shift telegraphy electric oscillator arrangements

Info

Publication number
GB1043747A
GB1043747A GB3850363A GB3850363A GB1043747A GB 1043747 A GB1043747 A GB 1043747A GB 3850363 A GB3850363 A GB 3850363A GB 3850363 A GB3850363 A GB 3850363A GB 1043747 A GB1043747 A GB 1043747A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillator
output
telegraphy
low
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
GB3850363A
Inventor
Eric Ribchester
Gordon Maurice West
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 Company PLC
Original Assignee
General Electric Company PLC
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 General Electric Company PLC filed Critical General Electric Company PLC
Priority to GB3850363A priority Critical patent/GB1043747A/en
Publication of GB1043747A publication Critical patent/GB1043747A/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
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

1,043,747. Automatic frequency control systems; telegraphy. GENERAL ELECTRICAL CO. Ltd. Dec. 11, 1964 [Sept. 30, 1963], No. 38503/63. Headings H3A and H4P. In a frequency-shift telegraphy system the frequency Fx of the output oscillator 1 is stabilized by mixing with one of a plurality of crystal-controlled harmonic frequencies Fo to produce a lower (difference) frequency (Fo-Fx) which is applied to a phase discriminator 7 together with a selected one of a plurality of crystal-controlled low-frequency oscillations Fa, Fb, and the discriminator output applied as feedback through a low-pass filter 11 to a reactance valve circuit 2 stabilizing the oscillator 1. Frequency shift of the output of oscillator 1 is effected by an electronic switch 8 which connects oscillator 9 or 10 to the phase detector. The low-pass filter is given a narrow pass-band to prevent high-frequency transients affecting the output oscillator frequency on switching.
GB3850363A 1963-09-30 1963-09-30 Improvements in or relating to frequency shift telegraphy electric oscillator arrangements Expired GB1043747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3850363A GB1043747A (en) 1963-09-30 1963-09-30 Improvements in or relating to frequency shift telegraphy electric oscillator arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3850363A GB1043747A (en) 1963-09-30 1963-09-30 Improvements in or relating to frequency shift telegraphy electric oscillator arrangements

Publications (1)

Publication Number Publication Date
GB1043747A true GB1043747A (en) 1966-09-28

Family

ID=10403893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3850363A Expired GB1043747A (en) 1963-09-30 1963-09-30 Improvements in or relating to frequency shift telegraphy electric oscillator arrangements

Country Status (1)

Country Link
GB (1) GB1043747A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026657A3 (en) * 1979-09-28 1981-05-20 Parks Cramer Company Transmitter and receiver for textile machine data link arrangement
DE3128992A1 (en) * 1981-07-22 1983-05-05 Siemens AG, 1000 Berlin und 8000 München Duplex transceiver device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0026657A3 (en) * 1979-09-28 1981-05-20 Parks Cramer Company Transmitter and receiver for textile machine data link arrangement
DE3128992A1 (en) * 1981-07-22 1983-05-05 Siemens AG, 1000 Berlin und 8000 München Duplex transceiver device

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