GB540681A - Improvements in radio direction finding equipments - Google Patents
Improvements in radio direction finding equipmentsInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2953783A (en) * | 1945-03-22 | 1960-09-20 | Edwin G Schneider | Conical scan direction finder |
-
1940
- 1940-03-12 GB GB4604/40A patent/GB540681A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2953783A (en) * | 1945-03-22 | 1960-09-20 | Edwin G Schneider | Conical scan direction finder |
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