GB542693A - Improvements in radio transmission systems - Google Patents
Improvements in radio transmission systemsInfo
- Publication number
- GB542693A GB542693A GB10492/40A GB1049240A GB542693A GB 542693 A GB542693 A GB 542693A GB 10492/40 A GB10492/40 A GB 10492/40A GB 1049240 A GB1049240 A GB 1049240A GB 542693 A GB542693 A GB 542693A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- aerials
- aerial
- june
- valves
- 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
- 230000005540 biological transmission Effects 0.000 title 1
- 230000010287 polarization Effects 0.000 abstract 3
- 230000005855 radiation Effects 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000011664 signaling Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
- H04B14/008—Polarisation modulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
542,693. Wireless signalling. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. June 17, 1940, No. 10492. Convention date, June 17, 1939. [Class 40 (v)] Two waves of the same frequency but differing in phase are modulated differentially in phase by the signal and are radiated from aerials giving different planes of polarization. Carrier from a source 10 is applied through a phase-retarding coil I, and a phase-advancing condenser J 1 to the respective grids of valve V 1 , V 2 the joint output of which feeds an aerial 36 through a line Y. The amplification of the valves is varied in opposite senses by applying the signal from source 40 differentially to the two grids, producing a phase-modulated wave in the aerial 36. Similar connexions are made through valves V 3 , V 4 and line Z to an aerial 38 arranged to give radiation of different polarization from that of aerial 36. The lines Y, Z are of different electrical length so that there is a phase difference between the currents in the aerials, and the phase modulation increases or decreases this phase difference according to the sense of the modulating voltage. At the receiver, the radiations are picked up by aerials responsive to the respective polarizations, and are combined vectorially to produce an amplitude-modulated wave which is detected by an ordinary receiver. The aerials at both stations may be dipoles set up at right-angles. Specifications 411,638 and 542,005 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US279657A US2273161A (en) | 1939-06-17 | 1939-06-17 | Polarized wave modulation by phase variation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB542693A true GB542693A (en) | 1942-01-23 |
Family
ID=23069905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10492/40A Expired GB542693A (en) | 1939-06-17 | 1940-06-17 | Improvements in radio transmission systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2273161A (en) |
| GB (1) | GB542693A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2609224A1 (en) * | 1986-12-30 | 1988-07-01 | Thomson Csf | DEVICE AND METHOD FOR TRANSMITTING AND / OR ACQUIRING DATA USING TWO POLARIZATIONS CROSSED BY AN ELECTROMAGNETIC WAVE AND MAGNETIC RECORDING DEVICE |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3015096A (en) * | 1942-03-30 | 1961-12-26 | Itt | Radar counter-measure radio repeater |
| US2434904A (en) * | 1943-04-03 | 1948-01-27 | Standard Telephones Cables Ltd | Phase shifting arrangement |
| GB565403A (en) * | 1943-02-05 | 1944-11-09 | Mullard Radio Valve Co Ltd | Improvements in and relating to phase modulators |
| US2658991A (en) * | 1946-05-08 | 1953-11-10 | Richard S O'brien | Antijamming radar system |
| CH269672A (en) * | 1946-12-06 | 1950-07-15 | Marconi Wireless Telegraph Co | High frequency electrical installation. |
| US2858421A (en) * | 1951-01-12 | 1958-10-28 | Touvet Guy Achille | Light communication system |
| US3357013A (en) * | 1954-02-26 | 1967-12-05 | Gerald E Hart | System for arbitrary antenna polarization control |
| US3357018A (en) * | 1964-11-06 | 1967-12-05 | Itek Corp | Mode-averaging diversity combining reception system for high-frequency radio waves |
| JPS59104847A (en) * | 1982-12-07 | 1984-06-16 | Fujitsu Ltd | Radio communicating system |
| DE102006029317A1 (en) * | 2006-06-23 | 2007-12-27 | Selex Sistemi Integrati Gmbh | Polarization modulated transmitter |
-
1939
- 1939-06-17 US US279657A patent/US2273161A/en not_active Expired - Lifetime
-
1940
- 1940-06-17 GB GB10492/40A patent/GB542693A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2609224A1 (en) * | 1986-12-30 | 1988-07-01 | Thomson Csf | DEVICE AND METHOD FOR TRANSMITTING AND / OR ACQUIRING DATA USING TWO POLARIZATIONS CROSSED BY AN ELECTROMAGNETIC WAVE AND MAGNETIC RECORDING DEVICE |
| EP0279997A2 (en) * | 1986-12-30 | 1988-08-31 | Thomson-Csf | Apparatus and method for data transmission using two crossed polarisations of an electro-magnetic wave |
| EP0279997A3 (en) * | 1986-12-30 | 1988-10-26 | Thomson-Csf | Apparatus and method for data transmission using two crossed polarisations of an electro-magnetic wave |
Also Published As
| Publication number | Publication date |
|---|---|
| US2273161A (en) | 1942-02-17 |
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