US2152329A - Duplex communication apparatus - Google Patents

Duplex communication apparatus Download PDF

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Publication number
US2152329A
US2152329A US137666A US13766637A US2152329A US 2152329 A US2152329 A US 2152329A US 137666 A US137666 A US 137666A US 13766637 A US13766637 A US 13766637A US 2152329 A US2152329 A US 2152329A
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United States
Prior art keywords
station
antenna
stations
wide
directional
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
US137666A
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English (en)
Inventor
Schussler Karl
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.)
Telefunken AG
Original Assignee
Telefunken 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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2152329A publication Critical patent/US2152329A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • the present invention relates to duplex or twoway radio communication on short waves, preferably for full-automatic stations from which or by way of which traffic is feasible in different directions.
  • the present arrangement designed for duplex or mutual communication on short waves between two or more stations comprising the use of directional antennae operating with comparatively reduced radiation or beam angles for signal transmission has this outstanding characteristic that, in addition to the directive aerials, an antenna having a comparatively wide radiation angle or preferably a non-directional antenna producing a beam only in the vertical sense, is provided. 4
  • This wide-apertured or non-directional antenna is united with a receiving apparatus so that signals may be picked up no matter from what direction they may arrive.
  • a busy signal or permanent signal is sent out by way of the wide-apertured or non-directional antenna of the operating stations so that useless calls from other points or exchanges not participating in an actual connection may be avoided.
  • Fig. 1 shows the arrangement and its underlying idea applied to a central system.
  • a central station Z comprising a non-directional antenna R which is united with an apparatus Mz operating normally as a receiver.
  • Around the non-directional antenna are mounted directional outfits G'1 to G4 which are turned towards the correspondent stations G1 to G"4, respectively.
  • the transmitters and receivers required for the desired connection are rendered operative and cut in. Supposing that all stations work on one and the same wave, and that station G1 is connected by way of Z'with station or exchange G"4, it may happen that the station G2 while communications are proceeding between G1 and G"4 also makes attempts to get a connection.
  • the said station G"2 thus will ring central and in case of full automatic operation, by sending out a corresponding number of impulses, will attempt also to get connection, say with G"4.
  • the non-directional antenna R In order that disturbances in an already existing connection caused by a third outside station may be precluded, the non-directional antenna R, while communications are proceeding, is used. for the purpose of sending out a sort of busy signal in order that futile attempts from a third station to get a connection may be avoided.
  • Fig. 2 shows an exemplified embodiment of the basic idea of the invention in connection with a 4i so-called line system.
  • Three stations MI, Mn, and Min are to be mounted, for instance, at the corners of a triangle.
  • Each station shall be assumed to be equipped with only a radio frequency outfit G1, G11 or Gm, respectively, for signal transmission which is pivotal or revolvable, and moreover a fixed wide-apertured antenna W1, W11 or Wm, respectively, having a solid or horizontal beam angle. This may be achieved, for
  • station M1 calls station M11
  • the radio frequency apparatus G11 pursuant and in response to the characteristic call signals will be changed from the particular position of rest it happened to occupy and be directed toward station I, and the equipment be cut in.
  • the wideapertured antenna W11 is changed over to an auxiliary transmitter which causes a busy signal to be sent out.
  • a distinct auxiliary transmitter could also be dispensed with and a certain amount of energy may be separated from the radio frequency apparatus G11, be separately rectified, and put on the wide-apertured radiator or antenna.
  • station M1 After termination of the conversation, station M1 sends out a sort of clearing signal with the result that the radio frequency apparatus G11 of station Mn is disconnected, and the wide angle antenna is reconnected to the receiver apparatus.
  • initiation of a connection that is to say, connection of transmission equipment and adjustment of the directional antennae is accomplishable by the intermediary of relays, switch mechanism, or the like, which are fed with operating impulses by way of the wide-apertured antenna or non-directional antenna.
  • Fig. 3 shows an installation which will satisfy even the severest requirements.
  • a transmitter S and a receiver E At each of the head or terminal stations A and C are provided a transmitter S and a receiver E, While two of each are provided at the intermediate station B.
  • the non-directional antenna R or the wide angled antenna W may selectively be connected with a distinct auxiliary receiver EH or auxiliary transmitter SH. In particular instances, of course, simultaneous signalling to all subscribers may be insured by way of the non-directional radiator.
  • the length of the wave may be chosen ad lib, in fact it may be chosen to conform to existing technical requirements.
  • a short wave communication system comprising a first station and a second station, each of said stations having a relatively narrow angle directive antenna positioned to communicate with the directive antenna at the other station, a third station for communicating with either one of said first and second stations, and a relatively wide angle antenna located at each of said first and second stations adapted to radiate signals when said stations are in communication with each other, for indicating a busy condition to said third station.
  • a short wave communication system comprising a first station and a second station, each of said stations having a directive antenna positioned to communicate with the directive antenna at the other station, a third station for communieating with either one of said first and second stations, and a non-directional antenna located at each of said first and second stations adapted to radiate signals when said stations are in communication for indicating a busy condition to said third station.
  • a short wave communication system comprising-a first station and a second station, each of said stations having a directive antenna .positioned to communicate with the directive antenna at the other station, and a third station for communicatingwith one of said first two stations, and a non-directional antenna located at at least one of said first and second stations for radiating a busy signal tov said third station when said first and second stations are in communication.
  • a short wave communication system having a first station equipped with both a relatively narrow angle antenna and a wide angle antenna, receiving and transmitting apparatus at said station, said wide angle antenna being coupled to said receiving apparatus in the absence of communication between said station and a second station, and means at said first station responsive to a predetermined signal receivedover said wide angle antenna from said second station for disconnecting said last antenna from said receiving apparatus and for connecting same to said transmitting apparatus, whereby a busy signal is sent out over said wide angle antenna.
  • a short wave communication system having a first station equipped with both a relatively narrow angle antenna and a wide angle antenna, receiving and transmitting apparatus at said station, said wide angle antenna being coupled to said receiving apparatus in the absence of communication between said station and a second station, and means at said first station responsive to a predetermined signal received over said wide angle antenna from said second station for disconnecting said last antenna from said receiving apparatus and for connecting same to said transmitting apparatus, whereby a busy signal is sent out over said wide angle antenna, and additional means atsaid first station also responsive to said predetermined signal for automatically directing the position of said narrow angle antenna to communicate with said second station.
  • a short wave communication system comprising a first station and a second station, each of said stations having a directive antenna'positioned to communicate with the directive antenna at the otherstation, and a third station for communicating with one of said first two stations, and a wide angle antenna located at at least one of said first and second stations for radiating a busy signal to said third station when said first and second stations are in communication.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US137666A 1936-05-08 1937-04-19 Duplex communication apparatus Expired - Lifetime US2152329A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE476541X 1936-05-08

Publications (1)

Publication Number Publication Date
US2152329A true US2152329A (en) 1939-03-28

Family

ID=6542013

Family Applications (1)

Application Number Title Priority Date Filing Date
US137666A Expired - Lifetime US2152329A (en) 1936-05-08 1937-04-19 Duplex communication apparatus

Country Status (3)

Country Link
US (1) US2152329A (enrdf_load_stackoverflow)
GB (1) GB476541A (enrdf_load_stackoverflow)
NL (1) NL46700C (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444426A (en) * 1943-10-26 1948-07-06 Standard Telephones Cables Ltd Repeater control system
US2479701A (en) * 1944-02-07 1949-08-23 William C De Vry Transmitting system
US2513490A (en) * 1947-02-28 1950-07-04 Rca Corp Selective communication system between ground station and a plurality of mobile stations
US2538063A (en) * 1946-07-11 1951-01-16 Touvet Guy Search and orientation system
US2571386A (en) * 1949-09-16 1951-10-16 Rca Corp Early warning relay system
US2607915A (en) * 1945-08-06 1952-08-19 Norgorden Oscar Radio beacon system
US2641755A (en) * 1950-11-22 1953-06-09 Automatic Elect Lab Short-wave directional radio communication system
US2649539A (en) * 1948-02-21 1953-08-18 Bell Telephone Labor Inc Microwave carrier telephone system
US3274598A (en) * 1964-02-26 1966-09-20 Claud E Cleeton Directive response transponder system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444426A (en) * 1943-10-26 1948-07-06 Standard Telephones Cables Ltd Repeater control system
US2479701A (en) * 1944-02-07 1949-08-23 William C De Vry Transmitting system
US2607915A (en) * 1945-08-06 1952-08-19 Norgorden Oscar Radio beacon system
US2538063A (en) * 1946-07-11 1951-01-16 Touvet Guy Search and orientation system
US2513490A (en) * 1947-02-28 1950-07-04 Rca Corp Selective communication system between ground station and a plurality of mobile stations
US2649539A (en) * 1948-02-21 1953-08-18 Bell Telephone Labor Inc Microwave carrier telephone system
US2571386A (en) * 1949-09-16 1951-10-16 Rca Corp Early warning relay system
US2641755A (en) * 1950-11-22 1953-06-09 Automatic Elect Lab Short-wave directional radio communication system
US3274598A (en) * 1964-02-26 1966-09-20 Claud E Cleeton Directive response transponder system

Also Published As

Publication number Publication date
NL46700C (enrdf_load_stackoverflow)
GB476541A (en) 1937-12-10

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