GB347956A - Improvements in or relating to radio signalling systems - Google Patents

Improvements in or relating to radio signalling systems

Info

Publication number
GB347956A
GB347956A GB19250/30A GB1925030A GB347956A GB 347956 A GB347956 A GB 347956A GB 19250/30 A GB19250/30 A GB 19250/30A GB 1925030 A GB1925030 A GB 1925030A GB 347956 A GB347956 A GB 347956A
Authority
GB
United Kingdom
Prior art keywords
marking
spacing
beginning
periods
frequency
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
GB19250/30A
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.)
Telefunken AG
Original Assignee
Telefunken AG
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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
Priority claimed from DET37231D external-priority patent/DE537382C/en
Application filed by Telefunken AG, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB347956A publication Critical patent/GB347956A/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
    • H04L27/16—Frequency regulation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00095—Systems or arrangements for the transmission of the picture signal
    • H04N1/00103—Systems or arrangements for the transmission of the picture signal specially adapted for radio transmission, e.g. via satellites

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Transmitters (AREA)
  • Radio Relay Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Television Systems (AREA)

Abstract

347,956. Wireless telegraphy. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. June 24, 1930, No. 19250. Convention date, July 6, 1929. Drawings to Specification. [Class 40 (v).] A short-wave high-speed telegraph or copying- telegraph system uses one frequency for marking and another for spacing, the former starts the marking at the receiver and the latter ends it. The transmitter may send out energy during the whole of the marking and spacing periods, or during all the marking periods and at the beginning of each spacing period, or at the beginning only of each marking and each spacing period. The last system reduces the effect of fading. A thermionic-valve or glow-discharge relay cuts in or out a recording current at the change over from one frequency to the other.
GB19250/30A 1929-07-06 1930-06-24 Improvements in or relating to radio signalling systems Expired GB347956A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DET37231D DE537382C (en) 1929-07-06 1929-07-06 Procedure to eliminate annoying broadening of characters in shortwave telegraphy
DET37324D DE542163C (en) 1929-07-06 1929-07-26 Procedure to eliminate annoying broadening of characters in shortwave telegraphy

Publications (1)

Publication Number Publication Date
GB347956A true GB347956A (en) 1931-05-07

Family

ID=26000411

Family Applications (2)

Application Number Title Priority Date Filing Date
GB19250/30A Expired GB347956A (en) 1929-07-06 1930-06-24 Improvements in or relating to radio signalling systems
GB19388/30A Expired GB348937A (en) 1929-07-06 1930-06-25 Improvements in or relating to radio signalling systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB19388/30A Expired GB348937A (en) 1929-07-06 1930-06-25 Improvements in or relating to radio signalling systems

Country Status (3)

Country Link
US (1) US1914898A (en)
DE (1) DE542163C (en)
GB (2) GB347956A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510139A (en) * 1944-05-18 1950-06-06 Rca Corp Radio control system
US2486511A (en) * 1945-10-31 1949-11-01 Rca Corp Apparatus for receiving facsimile signals

Also Published As

Publication number Publication date
US1914898A (en) 1933-06-20
GB348937A (en) 1931-05-21
DE542163C (en) 1935-02-08

Similar Documents

Publication Publication Date Title
GB550193A (en) Improvements in and relating to multiplex frequency-modulation systems
GB378023A (en) Improvement in thermionic switching system
GB347956A (en) Improvements in or relating to radio signalling systems
GB500883A (en) Improvements in dual tone radio telegraphy system
GB476541A (en) Improvements in or relating to short wave wireless communication systems
CH294529A (en) Circuit arrangement for frequency adjustment in receiving systems for frequency-shifted telegraphy transmitters.
GB341766A (en) Improvements in or relating to radio and similar high frequency communication systems
GB359812A (en) Improvements in or relating to multiplex telegraph systems
GB339757A (en) Improvements in or relating to radio signalling systems
GB284665A (en)
GB306419A (en)
GB347984A (en) Improvements in or relating to high frequency receivers
GB317316A (en)
GB453759A (en) Improvements in or relating to radio and other transmitter installations
DE537200C (en)
GB533242A (en) Improvements in high frequency multiplex receiver systems
JPS648738A (en) Radio communication system
GB305652A (en) Improvements in or relating to radio communication systems
GB369112A (en) Improvements in or relating to modulating systems for electric oscillations
FRENKEL The quality and capacity of the fdm/fm satellite communication link(Pair of stations sharing satellite with other pairs, each station transmitting carrier, frequency modulated by baseband consisting of telephone or telegraph signals)
CA304768A (en) Transmitting or receiving aerial system for wireless telegraphy or telephone
GB411710A (en) Improvements in or relating to automatic limiter circuits suitable for use in facsimile and other telegraph systems
ES83579A1 (en) Complete station for the transmission and reception, by means of wireless telegraphy, of graphic documents without halftones.
GB378770A (en) Improvements in or relating to radio receiving arrangements
GB379586A (en) Improvements in or relating to secret modulated carrier signalling systems