US1821921A - Radio signaling system - Google Patents

Radio signaling system Download PDF

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Publication number
US1821921A
US1821921A US20033A US2003325A US1821921A US 1821921 A US1821921 A US 1821921A US 20033 A US20033 A US 20033A US 2003325 A US2003325 A US 2003325A US 1821921 A US1821921 A US 1821921A
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US
United States
Prior art keywords
transmitters
signaling system
radio signaling
signals
radio
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
US20033A
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English (en)
Inventor
Bangay Raymond Dorrington
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 US1821921A publication Critical patent/US1821921A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication

Definitions

  • This invention relates to a method of obtaining secrecy in radio communication.
  • the direction in which these two transmitters radiate is so arranged that the area of intersection of the two beams occurs at the point to which it is desired to signal.
  • At the sending station which may be at one or other of the transmitters or at some other place, means are provided for controlling both transmitters and for distributing or splitting up the signals between the two transmitters so that each beam carries only a portion of the signals, each portion being by itself unintelligible. It will be understood that excepting in the area covered by the intersection of the two beams, the signal can only be received from one of the two transmitting stations, and, consequently these signals will not be capable of interpretation except in that area.
  • a, b are two transmitters which, as illustrated, are provided with reflectors a1, 61, whereby the narrow beams transmitted can be caused to intersect at a receiving station 0.
  • signals are sent from a telegraph station 03 situated between the transmitters a and I) throu h land lines 6, 61, by the aid of a signaling key f so arranged that the short elements or dots of the Morse code are relayed to one transmitter a or 7) while the long elements or dashes are relayed to the other transmitter.
  • FIG 2 which shows transmitting means which take the place of the signaling key in Figure 1
  • g is a rapidly rotating commutator by which a signaling key f or as another alternative a telephone modulator h is sometimes connected to the. land line 0 and sometimes to the land line 61.
  • h is a telephone modulator permanently connected to the land lines 6, 61, through filter circuits i, 111, of which 2' is designed to reject all frequencies below 1000 cycles for example, and accept frequencies above this, and of which I reje'cts all frequencies above one thousand cycles and accepts frequencies below this.
  • signals be formed by two difierent supersonic frequencies-which when combined produce a beat of audio-frequency; one of the component super-sonic frequencies being impressed on the carrier wave of one transmitter while the other is impressed on the carrier wave of the other. In this case both frequencies are received simultaneously only in the area of intersection.
  • a transmission system having a sender connected by land wires to separated directional radiating antennae which are convergently focused upon a common receiving point.
  • a transmission system having a transmitting means, means for dissecting a message transmitted, wires for conducting the no separate elements of the dissected message to directional antennae for convergently radiating the elements and a single receiving means arranged to be effected by all the difa ferent elements and thus receive the complete message.
  • the combination With tWo directional transmitters at a distance from each other and each capable of radiating a narrow beam,of means Whereby some components of the signals are sent by one of the transmitters and other components by the other transmitter, the paths over which the beams are radiated being convergent to a common point.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
US20033A 1924-04-09 1925-04-02 Radio signaling system Expired - Lifetime US1821921A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9038/24A GB236647A (en) 1924-04-09 1924-04-09 Improvements in radio signalling systems

Publications (1)

Publication Number Publication Date
US1821921A true US1821921A (en) 1931-09-08

Family

ID=9864187

Family Applications (1)

Application Number Title Priority Date Filing Date
US20033A Expired - Lifetime US1821921A (en) 1924-04-09 1925-04-02 Radio signaling system

Country Status (3)

Country Link
US (1) US1821921A (enEXAMPLES)
GB (1) GB236647A (enEXAMPLES)
NL (1) NL16444C (enEXAMPLES)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146446A (en) * 1960-03-24 1964-08-25 Novitzky Anatol Ranging systems
US3335418A (en) * 1964-03-04 1967-08-08 Int Standard Electric Corp System for localizing radio communications
US3449745A (en) * 1965-01-15 1969-06-10 Lockheed Aircraft Corp Synthetic beam sharpening system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2099662B (en) * 1981-05-26 1985-02-20 Ferranti Ltd Secret communication systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146446A (en) * 1960-03-24 1964-08-25 Novitzky Anatol Ranging systems
US3335418A (en) * 1964-03-04 1967-08-08 Int Standard Electric Corp System for localizing radio communications
US3449745A (en) * 1965-01-15 1969-06-10 Lockheed Aircraft Corp Synthetic beam sharpening system

Also Published As

Publication number Publication date
GB236647A (en) 1925-07-09
NL16444C (enEXAMPLES)

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