GB567967A - Mechanical modulator for radio beacons utilising two tones - Google Patents
Mechanical modulator for radio beacons utilising two tonesInfo
- Publication number
- GB567967A GB567967A GB343440A GB343440A GB567967A GB 567967 A GB567967 A GB 567967A GB 343440 A GB343440 A GB 343440A GB 343440 A GB343440 A GB 343440A GB 567967 A GB567967 A GB 567967A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- wave
- collector
- plates
- rotating
- 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)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
567,967. Converting electric currents ; frictional electric machines. STANDARD TELEPHONES & CABLES, Ltd., and EARP, C. W. Feb. 23, 1940, No. 3434. [Classes 35 and 38 (ii)] [Also in Group XL] In a beacon system for guiding aircraft using different radiations identified by different tones, mechanical or rotary modulators are used and are arranged to produce either a single sideband, or a double side-band with carrier suppressed. Double side-bands f, f2 are simultaneously produced by rotating a coil W<SP>2</SP> at a tone frequency f2 in an electromagnetic field created by coils F<SP>1</SP>, F<SP>2</SP> energized at a carrier frequency f<SP>1</SP> ; or by rotating collector platen at frequency f<SP>2</SP> in an electrostatic field of frequency f<SP>1</SP>. When pairs of coils F<SP>1</SP>, F<SP>2</SP> are used, energized in phase quadrature to produce a rotating field, Fig. 2a, or when a rotating electrostatic field is employed, Fig. 2b, the pick-up is of a single frequency f +, f2 or f -, f2 according to the direction of rotation of the pick-up element relatively to that of the field. For higher frequencies f1, the line L carrying the short-wave energy is bent into a loop P of length equal to one or more wave-lengths, and a single collector plate R, Fig. 3a, or a pair of collector plates R<SP>1</SP>, R<SP>2</SP>. Fig. 3b, pick up the side frequency f 1 + mf2, where m is the number of wave-lengths in the loop, and f2 the rotation frequency of the collector plates. To overcome the effect of the open end of the line L, dummy collector plates connected by a tuning-coil may be rotated a quarter-wave in advance of the collector plates R<SP>1</SP>, R<SP>2</SP>, so as to short-circuit the line at this point. The loop may be formed of a series of quarter-wave portions, Fig. 4, brought in to plates 1 ... 8 over which the collector plate R sweeps. In a further arrangement, two loops fed with quadrature phases are connected at half-wave intervals to plates which alternate with each other in their position round the ring swept by the collector plate, Fig. 5 (not shown),
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB343440A GB567967A (en) | 1940-02-23 | 1940-02-23 | Mechanical modulator for radio beacons utilising two tones |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB343440A GB567967A (en) | 1940-02-23 | 1940-02-23 | Mechanical modulator for radio beacons utilising two tones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB567967A true GB567967A (en) | 1945-03-12 |
Family
ID=9758260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB343440A Expired GB567967A (en) | 1940-02-23 | 1940-02-23 | Mechanical modulator for radio beacons utilising two tones |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB567967A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114496531A (en) * | 2020-12-24 | 2022-05-13 | 台达电子企业管理（上海）有限公司 | Integrated inductor and power supply module |
-
1940
- 1940-02-23 GB GB343440A patent/GB567967A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114496531A (en) * | 2020-12-24 | 2022-05-13 | 台达电子企业管理（上海）有限公司 | Integrated inductor and power supply module |
| CN114496531B (en) * | 2020-12-24 | 2024-04-05 | 台达电子企业管理（上海）有限公司 | Integrated inductor and power module |
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