GB248774A - Improvements in or relating to wireless signalling - Google Patents

Improvements in or relating to wireless signalling

Info

Publication number
GB248774A
GB248774A GB6326/26A GB632626A GB248774A GB 248774 A GB248774 A GB 248774A GB 6326/26 A GB6326/26 A GB 6326/26A GB 632626 A GB632626 A GB 632626A GB 248774 A GB248774 A GB 248774A
Authority
GB
United Kingdom
Prior art keywords
modulation
circuit
marking
short
spacing
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
GB6326/26A
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
Application filed by Telefunken AG, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB248774A publication Critical patent/GB248774A/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

Abstract

248,774. Telefunken Ges., f³r Drahtlose Telegraphie. March 7, 1925, [Convention date]. Void [Published under Sect. 91 of the Acts]. Thermionic modulating systems. - A wireless transmitter is so arranged that the modulation during marking is different from that during spacing. The variation in modulation many be a variation in the degree of frequency of modulation or the wavelength may be varied from marking to spacing. Fig. 1 shows a control oscillator S and a main transmitter H in the grid circuit of which are chokes D1, D2 and a modulating device between terminals K, G. A transformer Tr supplies the modulating voltage and the key T is arranged to short-circuit resistance R2 to vary the degree of modulation. In modifications the key is arranged to short-circuit the transformer thus removing the modulation or to short-circuit one or other of two series connected transformers which are supplied with different frequencies so that the modulation frequency for marking is different from that during spacing.
GB6326/26A 1925-03-07 1926-03-06 Improvements in or relating to wireless signalling Expired GB248774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE248774X 1925-03-07

Publications (1)

Publication Number Publication Date
GB248774A true GB248774A (en) 1926-06-24

Family

ID=5935644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6326/26A Expired GB248774A (en) 1925-03-07 1926-03-06 Improvements in or relating to wireless signalling

Country Status (1)

Country Link
GB (1) GB248774A (en)

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