GB488021A - A device for periodically varying the directional characteristic of an aerial system - Google Patents
A device for periodically varying the directional characteristic of an aerial systemInfo
- Publication number
- GB488021A GB488021A GB10423/38A GB1042338A GB488021A GB 488021 A GB488021 A GB 488021A GB 10423/38 A GB10423/38 A GB 10423/38A GB 1042338 A GB1042338 A GB 1042338A GB 488021 A GB488021 A GB 488021A
- Authority
- GB
- United Kingdom
- Prior art keywords
- aerial
- directional
- relay
- switch
- energized
- 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
-
- 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)
- Transmitters (AREA)
- Selective Calling Equipment (AREA)
Abstract
488,021. Directive wireless signalling. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. May 11, 1937, No. 10423/38. Convention date, May 14, 1936. Divided out of 483,427. [Class 40 (v)] The directional characteristic of a receiving aerial system consisting of a directional and a non-directional aerial is periodically varied to enable an indication of correct course to be obtained when utilizing an ordinary transmitter as a beacon transmitter. The pickups from the frame aerial R and the non- directional aerial are combined in series by transformers and supplied via terminals K1, K2, to the input of a suitable receiver. The polarity of the voltage appearing across transformer secondary S3 is periodically reversed by operation of switch 2 which causes rectifier W1 or W2 to be in the conductive condition. Switch 2 is operated jointly with a switch 1 by a relay Rl which closes when condenser C1 has charged to a certain voltage through resistance R8, the condenser then discharging relatively rapidly through resistance R7 and releasing the relay. In this manner the time intervals during which the relay is energized and de-energized, causing the aerial outputs to be added in like or opposite phase, differ in length according to the difference in duration between dashes and dots.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL488021X | 1936-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB488021A true GB488021A (en) | 1938-06-29 |
Family
ID=19786651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10423/38A Expired GB488021A (en) | 1936-05-14 | 1937-05-11 | A device for periodically varying the directional characteristic of an aerial system |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE728539C (en) |
| FR (1) | FR821845A (en) |
| GB (1) | GB488021A (en) |
| NL (1) | NL52622C (en) |
-
0
- NL NL52622D patent/NL52622C/xx active
-
1937
- 1937-05-11 GB GB10423/38A patent/GB488021A/en not_active Expired
- 1937-05-12 DE DEP78789D patent/DE728539C/en not_active Expired
- 1937-05-13 FR FR821845D patent/FR821845A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR821845A (en) | 1937-12-14 |
| NL52622C (en) | |
| DE728539C (en) | 1942-11-28 |
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