GB1382732A - Apparatus for searching for people who are buried or trapped and equipped with the same type of apparatus - Google Patents

Apparatus for searching for people who are buried or trapped and equipped with the same type of apparatus

Info

Publication number
GB1382732A
GB1382732A GB5836372A GB5836372A GB1382732A GB 1382732 A GB1382732 A GB 1382732A GB 5836372 A GB5836372 A GB 5836372A GB 5836372 A GB5836372 A GB 5836372A GB 1382732 A GB1382732 A GB 1382732A
Authority
GB
United Kingdom
Prior art keywords
switch
contacts
stages
transistor
transmitter
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
GB5836372A
Other languages
English (en)
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.)
Autophon AG
Original Assignee
Autophon AG
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 Autophon AG filed Critical Autophon AG
Publication of GB1382732A publication Critical patent/GB1382732A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
    • G08B3/1016—Personal calling arrangements or devices, i.e. paging systems using wireless transmission
    • G08B3/1083—Pager locating systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Transmitters (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
GB5836372A 1971-12-24 1972-12-18 Apparatus for searching for people who are buried or trapped and equipped with the same type of apparatus Expired GB1382732A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1889571A CH539440A (de) 1971-12-24 1971-12-24 Gerät zur Suche von je ein gleiches Gerät tragenden verschütteten Personen

Publications (1)

Publication Number Publication Date
GB1382732A true GB1382732A (en) 1975-02-05

Family

ID=4435975

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5836372A Expired GB1382732A (en) 1971-12-24 1972-12-18 Apparatus for searching for people who are buried or trapped and equipped with the same type of apparatus

Country Status (7)

Country Link
US (1) US3777267A (enExample)
AT (1) AT316657B (enExample)
CH (1) CH539440A (enExample)
DE (1) DE2257689C3 (enExample)
FR (1) FR2170482A5 (enExample)
GB (1) GB1382732A (enExample)
IT (1) IT972487B (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1022984B (it) * 1974-10-17 1978-04-20 Philips Spa Unita autonoma monoblocca atta a svoloere la duplice funzione di elemento attivo e passivo di una apparecchiatura per l individuazione e la ricerca di persone sepolte
DE3215523C1 (de) * 1982-04-26 1983-09-29 Wilhelm Ruf KG, 8000 München Schaltungsanordnung zur Ortung Verschuetteter nach dem Sender/Empfaenger-Prinzip
US4649385A (en) * 1982-08-13 1987-03-10 Teloc R & D Ltd. Electronic locating system for persons receiving telephone calls
DE3531726A1 (de) * 1985-09-05 1987-03-05 Gerald Kampel Verschuettetensuchgeraet
US4850031A (en) * 1988-01-15 1989-07-18 Allsop J I Avalanche victim locating apparatus
US5365235A (en) * 1993-09-07 1994-11-15 Ford Motor Company Method and apparatus for reducing residual RF power in a transmitter/receiver antenna
DE9400950U1 (de) * 1994-01-20 1995-08-24 Selectronic Gesellschaft für Sicherheitstechnik und Sonderelektronik mbH, 14542 Werder Vorrichtung zur Erfassung lebender Körper sowie deren Verwendung
US6167249A (en) * 1997-01-22 2000-12-26 John W. Hereford Avalanche victim locating transceiving apparatus
US20030186677A1 (en) * 2002-03-27 2003-10-02 Anderson James Lynn Apparatus and method for directionalized active beacon pinging utilizing personal communication device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2039663A (en) * 1934-11-03 1936-05-05 Rca Corp Receiver manual and automatic gain control circuits

Also Published As

Publication number Publication date
CH539440A (de) 1973-07-31
US3777267A (en) 1973-12-04
IT972487B (it) 1974-05-20
AT316657B (de) 1974-07-25
FR2170482A5 (enExample) 1973-09-14
DE2257689B2 (de) 1973-11-29
DE2257689C3 (de) 1974-06-27
DE2257689A1 (de) 1973-07-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee