GB540681A - Improvements in radio direction finding equipments - Google Patents

Improvements in radio direction finding equipments

Info

Publication number
GB540681A
GB540681A GB4604/40A GB460440A GB540681A GB 540681 A GB540681 A GB 540681A GB 4604/40 A GB4604/40 A GB 4604/40A GB 460440 A GB460440 A GB 460440A GB 540681 A GB540681 A GB 540681A
Authority
GB
United Kingdom
Prior art keywords
amplifier
tuned
fed
output
negative feedback
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
GB4604/40A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4604/40A priority Critical patent/GB540681A/en
Publication of GB540681A publication Critical patent/GB540681A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • 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)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

540,681. Directive wireless systems. STANDARD TELEPHONES & CABLES, Ltd., and EARP, C. W. March 12, 1940, No. 4604. [Class 40 (v)] In direction finding equipment which may be of the kind described in Specification 490,940 or of the switched cardoid type in which signals are used from two or more separately tuned antennae, the amplifier following the tuned circuit in each individual current path is provided with negative feedback. In this way little damping is imposed on the input circuits and a good signal noise ratio is obtained and errors due to phase changes are minimized. The Figure shows loop aerials L 1 , L 2 at right angles to one another and a sense aerial V. The balanced modulators V 1 , V 2 and V 3 , V 4 give negative feedback to the tuned input circuits by windings W 1 , W 2 and are coupled in parallel to an amplifier V 5 the output from which is fed in parallel with the output of amplifier V 6 fed from the aerial V. Negative feedback is applied, by winding W 3 , to the tuned input circuit of amplifier V 6 . The output from circuit TC 4 is detected and applied to winding M of indicator I which is also fed with switching frequency from the oscillator circuits O 1 , O 2 as described in Specification 490,940.
GB4604/40A 1940-03-12 1940-03-12 Improvements in radio direction finding equipments Expired GB540681A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4604/40A GB540681A (en) 1940-03-12 1940-03-12 Improvements in radio direction finding equipments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4604/40A GB540681A (en) 1940-03-12 1940-03-12 Improvements in radio direction finding equipments

Publications (1)

Publication Number Publication Date
GB540681A true GB540681A (en) 1941-10-27

Family

ID=9780303

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4604/40A Expired GB540681A (en) 1940-03-12 1940-03-12 Improvements in radio direction finding equipments

Country Status (1)

Country Link
GB (1) GB540681A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953783A (en) * 1945-03-22 1960-09-20 Edwin G Schneider Conical scan direction finder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2953783A (en) * 1945-03-22 1960-09-20 Edwin G Schneider Conical scan direction finder

Similar Documents

Publication Publication Date Title
GB484590A (en) Improvements in radio direction finders and course indicating devices
ES377111A1 (en) Equal gain diversity receiving system with squelch
US2234587A (en) Radio direction finding system
US2587590A (en) Ultrahigh-frequency apparatus
GB540681A (en) Improvements in radio direction finding equipments
GB692990A (en) Improvements in or relating to radio direction finders
GB800583A (en) Directional antenna control system
US2863042A (en) Echo transmitter and receiver having means to produce stable intermediate frequency despite transmitter frequency drift
GB1024242A (en) Radio navigation system
ES217192A1 (en) Phase detector
GB845847A (en) Radio diversity receiving system
US2419987A (en) Direction finder
SU117324A1 (en) Device for separate modulation and suppression of signal carriers
US1465961A (en) Wireless signaling system
GB994862A (en) Test circuit for automatic direction finder
US2646566A (en) Phase-type direction finder system
GB881548A (en) Combining system for diversity communication systems
US2412959A (en) Radio direction finder system
GB702178A (en) Improvements in or relating to radio direction finding apparatus
GB675086A (en) Balanced electronic modulator
GB580502A (en) Improvements in or relating to radio systems for guiding aircraft
GB1022998A (en) Wide band direction finding system antenna
GB817740A (en) Improvements relating to high frequency electrical circuit arrangements
US1761049A (en) Interference reducing means for radio receiving apparatus
SU337061A1 (en) Magnetic detector