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US1681564A - Radio signaling system - Google Patents

Radio signaling system Download PDF

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Publication number
US1681564A
US1681564A US540387A US54038722A US1681564A US 1681564 A US1681564 A US 1681564A US 540387 A US540387 A US 540387A US 54038722 A US54038722 A US 54038722A US 1681564 A US1681564 A US 1681564A
Authority
US
United States
Prior art keywords
frequencies
frequency
beat
signals
transmitted
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 - Lifetime
Application number
US540387A
Other languages
English (en)
Inventor
Wright George Maurice
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1681564A publication Critical patent/US1681564A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • I provide asingle transmitting aerial with means which acting separately cause waves of two different frequencies to be transmitted and acting together cause waves of at third frequency to be transmitted, and I provide at the receiving station means for generating two frequencies one of Wl'ilClllS the mean of one of the two transmitted frequencles and the third while i and pass them to two differently tuned receivers.
  • My invention is illustrated by theaccompanying drawing which is a diagram show ing a transmitting station A and a receiving station B.
  • At A, K, and K, are sending keys having their contacts connected to different points in the tuning inductanceL of a plain aerial so that when either or both of the keys are depressed the wave length is shortened.”
  • a system of prising at thes'ending station means which actingseparately cause waves of two different frequencies to be transmitted and acting to-ti gether cause waves of a third frequencyto be transmitted and at-the receiving station means for generating two'frequencies one of which is the mean of one of the said two transmitted frequencies and the third while the other is the mean of the other ofthe two transmitted frequencies andthe thirdfand two-receivers each of which is tuned to one of the two beat frequencies thus produced.
  • said two meanfrequeneies being adapted to give a different beat frequency with each wireless telegraphy com- GEORGE MAURIGE'WBIGHT, or CHESTERFIELD, rinerannnssienon T0 timeout signals;
  • the method of radio signaling which consists in transmitting one set of signals on' either of two frequencies alternatively, transmitting another set of signals on either of two frequencies alternatively, one of said frequenproduced for each set of signals, the beating frequency'for each set remaining constant,
  • radio signaling which comprisestransmitting one set of signals on two selected frequencies alternatively, transmitting a second set of signals on one of said selected frequencies and a third frequency alternatively, and receiving said signals by combining with the signals of the first set a frequency which 1s the mean of those used in the transmission of such set of si nals and b combining with the signals of the second set a frequency which 1s the mean of those used in the transmission of such second set of 'l
  • radio receiving apparatus adapted to receive two sets of signals transmitted on three frequencies, of'which one frequencyis common to both sets of signals, thecombination of means for producing a frequency, giving a beat frequency with said common frequency and another of said frequencies, means for producing a second frequency givingja differcy and the third of said frequencies, means for detecting both of said beat frequencies, and a plurality of indicating means, each vbeing arranged to respond to only onedetected beat frequency.
  • radio receiving apparatus adapted to rece ve two sets of signals transmitted on three-frequencles, of which one frequenc is commonsto both sets ofv signals, the combina-.
  • a transmitting aerial means associated therewith which acting separately cause waves of two different frequencies to be transmittedand acting together cause waves of a third frequency to be transmitted and a receiving device including I means for generating a frequency which is I a mean of one ofthe two transmitting fre c quencies and, the third whereby an audible beat frequency is produced, and atranslating device associatedwithsaid beat frequency.
  • the method vof receiving oscillating currents whose respective frequencies vary from afirst given frequency to a second given frequency by combining therewith an oscillating current whose frequency .is-a mean of the frequencies of the first mentionedcun rentsivhereby a beat current of substantially constant frequency is produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
US540387A 1921-03-03 1922-03-02 Radio signaling system Expired - Lifetime US1681564A (en)

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
US1681564A true US1681564A (en) 1928-08-21

Family

ID=9825272

Family Applications (1)

Application Number Title Priority Date Filing Date
US540387A Expired - Lifetime US1681564A (en) 1921-03-03 1922-03-02 Radio signaling system

Country Status (4)

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

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448908A (en) * 1944-07-13 1948-09-07 Louis W Parker Television receiver
US2498488A (en) * 1946-06-14 1950-02-21 Gen Electric Television intercarrier or sound receiver circuit
US2504662A (en) * 1946-06-26 1950-04-18 Gen Electric Intercarrier television receiver circuit
US2505843A (en) * 1945-06-04 1950-05-02 Philco Corp Television receiver
US2562703A (en) * 1947-12-26 1951-07-31 Gen Electric Multiple channel radio receiving system
US20130241309A1 (en) * 2010-11-24 2013-09-19 David Patrick Arnold Wireless power transfer via electrodynamic coupling

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448908A (en) * 1944-07-13 1948-09-07 Louis W Parker Television receiver
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
US2504662A (en) * 1946-06-26 1950-04-18 Gen Electric Intercarrier television receiver circuit
US2562703A (en) * 1947-12-26 1951-07-31 Gen Electric Multiple channel radio receiving system
US20130241309A1 (en) * 2010-11-24 2013-09-19 David Patrick Arnold Wireless power transfer via electrodynamic coupling
US20170155287A1 (en) * 2010-11-24 2017-06-01 University Of Florida Research Foundation, Incorporated Wireless power transfer via electrodynamic coupling
US9866066B2 (en) * 2010-11-24 2018-01-09 University Of Florida Research Foundation, Incorporated Wireless power transfer via electrodynamic coupling
US10541558B2 (en) * 2010-11-24 2020-01-21 University Of Florida Research Foundation, Incorporated Wireless power transfer via electrodynamic coupling
US11309736B2 (en) 2010-11-24 2022-04-19 University Of Florida Research Foundation, Inc. Wireless power transfer via electrodynamic coupling
US11689089B2 (en) 2010-11-24 2023-06-27 University Of Florida Research Foundation, Inc. Wireless power transfer via electrodynamic coupling

Also Published As

Publication number Publication date
DE372468C (de) 1923-03-28
NL11057C (de)
GB181095A (en) 1922-06-06

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