GB556899A - Improvements in or relating to directional radio transmitters - Google Patents

Improvements in or relating to directional radio transmitters

Info

Publication number
GB556899A
GB556899A GB514/42A GB51442A GB556899A GB 556899 A GB556899 A GB 556899A GB 514/42 A GB514/42 A GB 514/42A GB 51442 A GB51442 A GB 51442A GB 556899 A GB556899 A GB 556899A
Authority
GB
United Kingdom
Prior art keywords
dipole
screen
directly
impedance
earthed
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
GB514/42A
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.)
AGA Baltic AB
Original Assignee
AGA Baltic AB
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 AGA Baltic AB filed Critical AGA Baltic AB
Publication of GB556899A publication Critical patent/GB556899A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

556,899. Directive wireless systems. AGABALTIC AKTIEBOLAG, (formerly AGABALTIC RADIO AKTIEBOLAG). Jan. 13, 1942, No. 514. Convention date, Jan. 13, 1941. [Class 40 (v)] A directional overlapping-beam transmitter, suitable for use in a blind landing system, comprises a dipole 11, 12, a grounded screen 13 disposed between and substantially perpendicular to the two halves of the dipole, and means 17 operated by a periodically acting code mechanism 16 for connecting one half 11 of the dipole to earth alternately directly and through an impedance 15. In the form shown the half 11 of the dipole is excited owing to its capacity coupling with the lower half, due to incomplete screening. When the contact 17 is closed the half dipole 11 is directly connected to the earthed screen, giving a radiation diagram of the form indicated at 18 and when the contact is opened the connection is through the impedance 15 and a diagram of the form shown by 19 is obtained, giving a course indicated at 20. In a modification, the screen has a length greater than the " critical " length, each half of the dipole is connected to one lead from the transmitter, and the lower half is periodically earthed directly and through an impedance. The " critical " length of the screen is that producing a radiation diagram which is symmetrical with respect to it when one half of the dipole is directly earthed. The arrangement indicates a glide path in all horizontal directions, and may be tilted with reference to the ground to vary the inclination of the path with direction. Specification 549,958 is referred to.
GB514/42A 1941-01-13 1942-01-13 Improvements in or relating to directional radio transmitters Expired GB556899A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE556899X 1941-01-13

Publications (1)

Publication Number Publication Date
GB556899A true GB556899A (en) 1943-10-27

Family

ID=20311933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB514/42A Expired GB556899A (en) 1941-01-13 1942-01-13 Improvements in or relating to directional radio transmitters

Country Status (2)

Country Link
US (1) US2347180A (en)
GB (1) GB556899A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523895A (en) * 1944-11-16 1950-09-26 Hartford Nat Bank & Trust Co Radio navigational aid
US2526675A (en) * 1945-04-28 1950-10-24 Sperry Corp Antenna structure
US2489615A (en) * 1947-09-13 1949-11-29 Hazeltine Research Inc Radio aid to air navigation

Also Published As

Publication number Publication date
US2347180A (en) 1944-04-25

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