US2485353A - Radio direction finder - Google Patents

Radio direction finder Download PDF

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Publication number
US2485353A
US2485353A US666248A US66624846A US2485353A US 2485353 A US2485353 A US 2485353A US 666248 A US666248 A US 666248A US 66624846 A US66624846 A US 66624846A US 2485353 A US2485353 A US 2485353A
Authority
US
United States
Prior art keywords
receivers
antennas
phase
amplification
cathode
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
US666248A
Other languages
English (en)
Inventor
Boosman Herman Bernard Rudolf
Christiaan Jan De Lussan Sablo
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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
Priority claimed from GB206642A external-priority patent/GB553618A/en
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2485353A publication Critical patent/US2485353A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G01S3/143—Systems for determining direction or deviation from predetermined direction by vectorial combination of signals derived from differently oriented antennae
    • 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
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves

Definitions

  • This invention relates to a direction finder in which use is made of two uniform directional antenna systems which extend at right angles with respect to one another and are connected ode-ray tube there appears on the screen of the cathode-ray tube a line whose slope corresponds to the direction of the transmitter of which a bearing is taken. It is of importance that the amplification and the phase-displacement in the two receivers are exactly equal. Indeed, if the amplification in both channels were uneven the direction of the line on the screen would not tally with the course direction, whereas in the case of uneven phase-displacement an elliptical figure would ensue due to which correct reading of the course direction would be impeded.
  • the sole figure represents two uniform frame antennas l and 2 which extend at right angles with respect to one another and are preferably connected to superheterodyne receivers 3 and 4 respectively.
  • the two superheterodyne receivers a common local oscillator I3 in a known manner, it is provided that not only in either case the intermediate frequencies are exactly equal, but, moreover, the phase-difference between the intermediate frequency voltages, generated by the two mixing tubes l1 and I8, respectively, is entirely equal to that between the two high frequency voltages that aresupplied to these tubes.
  • the voltages set up in the output circuits of the receivers are supplied to an indicatin device.
  • the indicating device is a cathode-ray tube comprising two deflecting devices which extend at right angles with respect to one another.
  • the voltages supplied by the receivers 3 and 4 are supplied to deflecting devices consisting of the pairs of plates 5, 5 and 6, 6 respectively as a result of which a straight line appears on the screen of the cathode-ray tube, the direction of the said line corresponding to the direction of the transmitter of which a bearing is taken, if the oscillations picked up by the antennas I and 2 respectively undergo the same amplification and phase-displacement in the transmitting circuits between antenna and deflecting device.
  • a switch 1 is provided by means of which the input-circuits of the two receivers can be connected in parallel.
  • This switch may be constructed in various ways. For the sake of simplicity .a unipolar switch is shown in the drawing.
  • the transmitting circuit comprises a device 9, provided between the antenna .2 and the pair of plates 6, 6, by means of which device the phase-displacement and the amplification of the said transmitting circuit can be controlled.
  • the phase-displacement .in the two receivers is not uniform an elliptical figure ensues and in the case of uneven amplification of the two receivers the angle at which appears the stroke or the figure difiers from 45; in this way it can thus be ascertained whether the phase-displacement and the amplification of both receivers are equal to each other. If this is not the case the device 9 permits both the phase-displacement and the amplification factor of the receiver 4 to be adjusted until a straight line is obtained on the screen of the cathode-ray 3 tube which line forms an angle of 45 with the pairs of plates 5, 5' and 6, 6'.
  • the switch I in the device according to the invention is preferably so designed as to permit kneeor foot-control.
  • the construction of the switch may be such that upon releasing the control knob it resumes automatically its position of rest, for.
  • This may, for instance, be effected by variation of a coupling condenser in one or more of the intermediate frequency bandpass filters of each of the receivers, the condenser in receiver 3 being designated by reference numeral l0 and that in receiver 4 by numeral II.
  • the reference numbers 20 and 21 designate the detectors and low-frequency amplifiers of the receivers 3 and 4 respectively.
  • the variable coupling condensers are mechanically interconnected as is indicated by the dotted line l2.
  • a direction finding system comprising two mutually perpendicular directional antennas, a pair of receivers, a cathode-ray indicator including first and second deflection means for deflecting the cathode ray in directions extending at right angles to one another, one of said antennas being coupled through one of said receivers to one of said deflection means and the other of said antennas being coupled through the other of said receivers to the other of said deflection niearls, a phase-shifting device interposed between one of said deflection means and the associated receiver, and switching means arranged to connect said two antennas in parallel relation.
  • a direction finding system comprising two mutually perpendicular directional antennas, a pair of superheterodyne receivers including means for varying the amplification factor of both receivers simultaneously and to the same degree, a cathode-ray indicator including first and second deflection means for deflecting the cathode ray in directions extending at right angles to one another, one of said antennas being coupled through one of said receivers to one of said deflection means and the other of said antennas being coupled through the other of said receivers to the other of said deflection means, a phase shifting device interposed between one of said deflection means and the associated receiver, and switching means arranged to connect said two antennas in parallel relation.
  • a direction finding system comprising two mutually perpendicular directional antennas, a pair of superheterodyne receivers each provided with a multi-stage intermediate-frequency amplifier having an adjustable coupling condenser interposed between two successive stages to vary the amplification factor of the receiver, the adjustable condensers of said receivers being ganged together whereby the amplification factors of said receivers may be simultaneously varied to the same degree, a cathode-ray indicator including first and second deflection means for deflecting the ray in directions extending at right angles to one another, one of said antennas being coupled through one of said receivers to one of said deflection means and the other of said antennas being coupled through the other of said receivers to the other of said deflection means, a phase shifting device interposed between one of said deflection means and the associated receiver, and
  • switching means arranged to connect said two antennas in parallel relation.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US666248A 1940-08-10 1946-05-01 Radio direction finder Expired - Lifetime US2485353A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2485353X 1940-08-10
GB206642A GB553618A (en) 1942-02-16 1942-02-16 Improvements in or relating to wireless direction finders

Publications (1)

Publication Number Publication Date
US2485353A true US2485353A (en) 1949-10-18

Family

ID=32232333

Family Applications (1)

Application Number Title Priority Date Filing Date
US666248A Expired - Lifetime US2485353A (en) 1940-08-10 1946-05-01 Radio direction finder

Country Status (3)

Country Link
US (1) US2485353A (enrdf_load_stackoverflow)
BE (1) BE442426A (enrdf_load_stackoverflow)
FR (1) FR875404A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880415A (en) * 1953-03-23 1959-03-31 Wachtler Maximilian Direction finder with visual indication
US3105193A (en) * 1955-08-15 1963-09-24 Robert L Denton Visual frequency indicator for broad band sonar monitor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182950A (en) * 1935-05-14 1939-12-12 William A Fairlie Direction finder or course indicator
GB553618A (en) * 1942-02-16 1943-05-28 Philips Nv Improvements in or relating to wireless direction finders
US2407649A (en) * 1941-07-23 1946-09-17 Bell Telephone Labor Inc Direction finding system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182950A (en) * 1935-05-14 1939-12-12 William A Fairlie Direction finder or course indicator
US2407649A (en) * 1941-07-23 1946-09-17 Bell Telephone Labor Inc Direction finding system
GB553618A (en) * 1942-02-16 1943-05-28 Philips Nv Improvements in or relating to wireless direction finders

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880415A (en) * 1953-03-23 1959-03-31 Wachtler Maximilian Direction finder with visual indication
US3105193A (en) * 1955-08-15 1963-09-24 Robert L Denton Visual frequency indicator for broad band sonar monitor

Also Published As

Publication number Publication date
BE442426A (enrdf_load_stackoverflow) 1941-09-30
FR875404A (fr) 1942-09-21

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