GB581344A - Improvements in or relating to systems of secret radio communication - Google Patents

Improvements in or relating to systems of secret radio communication

Info

Publication number
GB581344A
GB581344A GB1078/44A GB107844A GB581344A GB 581344 A GB581344 A GB 581344A GB 1078/44 A GB1078/44 A GB 1078/44A GB 107844 A GB107844 A GB 107844A GB 581344 A GB581344 A GB 581344A
Authority
GB
United Kingdom
Prior art keywords
pulses
source
wider
aerial
amplifier
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
GB1078/44A
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.)
Sperry Gyroscope Co Inc
Original Assignee
Sperry Gyroscope Co Inc
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 Sperry Gyroscope Co Inc filed Critical Sperry Gyroscope Co Inc
Publication of GB581344A publication Critical patent/GB581344A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Transmitters (AREA)

Abstract

581,344. Wireless signalling. SPERRY GYROSCOPE CO., Inc. Jan. 19, 1944, No. 1078. Convention date, Jan. 22, 1943. [Class 40 (v)] A secret radio communication system employs pulses of high-frequency radiation modulated by the desired signal and the receiver is provided with gating means synchronized independently of the pulses for rendering the receiver operative only during pulse reception. Confusing or noise signals are simultaneously radiated on a wider directive diagram, or on a wider frequency band, or with a different pulse rate or with wider pulses. As shown, the desired signal from the source 17 modulates a carrier from the generator 13 in a modulator 14, and the modulated wave is broken up by pulses 31 from a pulse source 30 in an amplifier 15, the wave being radiated from an aerial 16. The receiver 18 is controlled by pulses from a source 32 synchronized with the source 30 so that reception is possible only at the times at which pulses are arriving at the aerial 19. Interference in the intervals between pulses is thus eliminated. Spurious signals from a source 24 are modulated on a carrier from a generator 21 and the modulated wave passed to an amplifier 23 which may be tuned to pass a broader band than the amplifier 15. The aerial 25 for the spurious transmission may be designed to radiate over a wider angle than the main aerial 16, as indicated by the directional diagrams 26, 27. The spurious transmission may be continuous, or may be pulsed at a different rate or with wider pulses than the desired transmission.
GB1078/44A 1943-01-22 1944-01-19 Improvements in or relating to systems of secret radio communication Expired GB581344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US473266A US2476337A (en) 1943-01-22 1943-01-22 Secret radio communication

Publications (1)

Publication Number Publication Date
GB581344A true GB581344A (en) 1946-10-09

Family

ID=23878848

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1078/44A Expired GB581344A (en) 1943-01-22 1944-01-19 Improvements in or relating to systems of secret radio communication

Country Status (2)

Country Link
US (1) US2476337A (en)
GB (1) GB581344A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530142A (en) * 1944-08-11 1950-11-14 Tung Sol Lamp Works Inc Secret signaling system
US2753448A (en) * 1949-10-06 1956-07-03 Rines Robert Harvey Radio-wave pulse system
US2709254A (en) * 1950-06-23 1955-05-24 Multiplex Dev Corp Subscription radio broadcasting system and equipment therefor
US2745953A (en) * 1951-12-27 1956-05-15 Bell Telephone Labor Inc Radiant energy signaling systems
NL113618C (en) * 1956-05-25
US2953780A (en) * 1959-04-09 1960-09-20 Gen Precision Inc Doppler simulator
DE1259415B (en) * 1962-02-10 1968-01-25 Bundesrep Deutschland Method for the wireless secret transmission of signals
US3144648A (en) * 1962-09-28 1964-08-11 Advanced Dev Lab Inc Dual mode spiral antenna
IT991535B (en) * 1971-11-09 1975-08-30 Elliott Brothers London Ltd DEVICE FOR THE TRANSMISSION OF ELECTROMAGNETIC RADIATIONS
DE2251206C3 (en) * 1972-10-19 1986-01-02 Basf Ag, 6700 Ludwigshafen Process for the production of chlorocarbonic acid esters
US5341423A (en) * 1987-02-06 1994-08-23 General Electric Company Masked data transmission system
US5297201A (en) * 1992-10-13 1994-03-22 J.D. Technologies, Inc. System for preventing remote detection of computer data from tempest signal emissions
AU2008285349A1 (en) * 2007-08-08 2009-02-12 Radeum, Inc. Near field communications system having enhanced security
EP2193652A4 (en) * 2007-09-26 2014-03-05 Radeum Inc Dba Freelinc System and method for near field communications having local security
US20100166180A1 (en) * 2008-12-30 2010-07-01 Nortel Networks Limited Cloaking of radio signals

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1634390A (en) * 1927-07-05 Inghouse electric
US1309459A (en) * 1919-07-08 Wireless signaling system
US770229A (en) * 1902-05-14 1904-09-13 Greater New York Security Company Wireless signaling apparatus.
US725635A (en) * 1903-03-12 1903-04-14 Stone Telegraph And Telephone Company Space telegraphy.
US1480217A (en) * 1922-01-20 1924-01-08 Western Electric Co Method and means for signaling
US1622033A (en) * 1922-05-26 1927-03-22 Rca Corp Radiotelephony
US1596251A (en) * 1922-12-02 1926-08-17 Jr John Hays Hammond Secret radiant telephony
US1667792A (en) * 1923-01-11 1928-05-01 American Telephone & Telegraph Radio signaling system
US1624601A (en) * 1923-07-02 1927-04-12 Western Electric Co Secret communication
US1811102A (en) * 1924-09-10 1931-06-23 Western Electric Co Signal transmission by guided and unguided waves
GB288714A (en) * 1927-01-12 1928-04-12 Hugo Victor Flinn Improvements in telegraphy and telephony
US1931631A (en) * 1931-01-27 1933-10-24 Telefunken Gmbh Transmitting
US2034775A (en) * 1931-07-11 1936-03-24 Telefunken Gmbh Receiving system adapted to practice secret communication method
US2058686A (en) * 1932-10-25 1936-10-27 Radio Res Lab Inc Wave signaling method and apparatus
NL37013C (en) * 1933-01-20
US2072962A (en) * 1933-10-03 1937-03-09 Radio Patents Corp Radio system
DE731394C (en) * 1935-05-10 1943-02-09 Telefunken Gmbh Arrangement for the secret transmission of messages
FR816345A (en) * 1936-01-16 1937-08-05 Telefunken Gmbh Improvements to directed transmitters for secret communications
US2092442A (en) * 1936-07-07 1937-09-07 Colwell Robert Cameron Communication system
NL88393C (en) * 1937-06-18
GB504744A (en) * 1937-10-29 1939-05-01 Marconi Wireless Telegraph Co Improvements in or relating to navigation aiding radio transmitters
US2262838A (en) * 1937-11-19 1941-11-18 Int Standard Electric Corp Electric signaling system
US2266194A (en) * 1938-01-30 1941-12-16 Radio Patents Corp Television system
US2212238A (en) * 1938-06-11 1940-08-20 Internat Telephone Dev Co Inc Ultra short wave course beacon
US2199634A (en) * 1938-06-21 1940-05-07 Rca Corp Secret communication system
US2272839A (en) * 1938-11-23 1942-02-10 Jr John Hays Hammond Radiant energy signaling system
GB542005A (en) * 1939-06-17 1941-12-22 Marconi Wireless Telegraph Co Improvements in radio transmission systems
US2381444A (en) * 1940-12-27 1945-08-07 Rca Corp Radio system

Also Published As

Publication number Publication date
US2476337A (en) 1949-07-19

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