GB681543A - Improvements in or relating to superheterodyne receivers for frequency-shift telegraph signals - Google Patents

Improvements in or relating to superheterodyne receivers for frequency-shift telegraph signals

Info

Publication number
GB681543A
GB681543A GB31994/48A GB3199448A GB681543A GB 681543 A GB681543 A GB 681543A GB 31994/48 A GB31994/48 A GB 31994/48A GB 3199448 A GB3199448 A GB 3199448A GB 681543 A GB681543 A GB 681543A
Authority
GB
United Kingdom
Prior art keywords
frequency
mark
space
diodes
voltage
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
GB31994/48A
Other languages
English (en)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB681543A publication Critical patent/GB681543A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/042—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant with reactance tube
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • 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
    • H04L27/14—Demodulator circuits; Receiver circuits
    • 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
    • H04L27/16—Frequency regulation arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
GB31994/48A 1947-12-13 1948-12-10 Improvements in or relating to superheterodyne receivers for frequency-shift telegraph signals Expired GB681543A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL269957X 1947-12-13

Publications (1)

Publication Number Publication Date
GB681543A true GB681543A (en) 1952-10-29

Family

ID=19781884

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31994/48A Expired GB681543A (en) 1947-12-13 1948-12-10 Improvements in or relating to superheterodyne receivers for frequency-shift telegraph signals

Country Status (5)

Country Link
BE (1) BE486276A (US06262066-20010717-C00424.png)
CH (1) CH269957A (US06262066-20010717-C00424.png)
DE (1) DE807959C (US06262066-20010717-C00424.png)
FR (2) FR976416A (US06262066-20010717-C00424.png)
GB (1) GB681543A (US06262066-20010717-C00424.png)

Also Published As

Publication number Publication date
FR176416A (US06262066-20010717-C00424.png)
BE486276A (US06262066-20010717-C00424.png)
FR976416A (fr) 1951-03-19
DE807959C (de) 1951-07-09
CH269957A (de) 1950-07-31

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