GB181095A - Improvements in wireless telegraphy - Google Patents

Improvements in wireless telegraphy

Info

Publication number
GB181095A
GB181095A GB7029/21A GB702921A GB181095A GB 181095 A GB181095 A GB 181095A GB 7029/21 A GB7029/21 A GB 7029/21A GB 702921 A GB702921 A GB 702921A GB 181095 A GB181095 A GB 181095A
Authority
GB
United Kingdom
Prior art keywords
give
frequencies
key
diplex
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
GB7029/21A
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.)
Individual
Original Assignee
Individual
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 to NL11057D priority Critical patent/NL11057C/xx
Application filed by Individual filed Critical Individual
Priority to GB7029/21A priority patent/GB181095A/en
Priority to DEM76365D priority patent/DE372468C/en
Priority to US540387A priority patent/US1681564A/en
Publication of GB181095A publication Critical patent/GB181095A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • 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
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transceivers (AREA)
  • Radio Relay Systems (AREA)
  • Noise Elimination (AREA)

Abstract

181,095. Wright, G. M. March 3, 1921. Diplex signalling; heterodyne receiving systems. -A diplex system comprises a transmitting station A provided with means such as keys K1, K2, which when actuated separately give two different frequencies N1, N2, and when actuated together give a third frequency N3; and a receiving station B comprising two local generators H1, H, giving frequencies equal to N1 + N3 / 2, N2 + N3 / 2, respectively, so that waves received from the transmitter A corresponding to the closure of one key K, give the same beat frequency with one of the local generators H, whether the other key K2 is closed or open. The two beat frequencies thus produced are rectified and passed to separate receivers T1, T2 tuned by means of filters F1, F2.
GB7029/21A 1921-03-03 1921-03-03 Improvements in wireless telegraphy Expired GB181095A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL11057D NL11057C (en) 1921-03-03
GB7029/21A GB181095A (en) 1921-03-03 1921-03-03 Improvements in wireless telegraphy
DEM76365D DE372468C (en) 1921-03-03 1922-01-14 Arrangement for wireless messaging
US540387A US1681564A (en) 1921-03-03 1922-03-02 Radio signaling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7029/21A GB181095A (en) 1921-03-03 1921-03-03 Improvements in wireless telegraphy

Publications (1)

Publication Number Publication Date
GB181095A true GB181095A (en) 1922-06-06

Family

ID=9825272

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7029/21A Expired GB181095A (en) 1921-03-03 1921-03-03 Improvements in wireless telegraphy

Country Status (4)

Country Link
US (1) US1681564A (en)
DE (1) DE372468C (en)
GB (1) GB181095A (en)
NL (1) NL11057C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE490426A (en) * 1944-07-13
US2505843A (en) * 1945-06-04 1950-05-02 Philco Corp Television receiver
US2498488A (en) * 1946-06-14 1950-02-21 Gen Electric Television intercarrier or sound receiver circuit
FR957435A (en) * 1946-06-26 1950-02-20
US2562703A (en) * 1947-12-26 1951-07-31 Gen Electric Multiple channel radio receiving system
WO2012071088A1 (en) 2010-11-24 2012-05-31 University Of Florida Research Foundation Inc. Wireless power transfer via electrodynamic coupling

Also Published As

Publication number Publication date
US1681564A (en) 1928-08-21
DE372468C (en) 1923-03-28
NL11057C (en)

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