GB566259A - Improvements in radio transmission systems - Google Patents
Improvements in radio transmission systemsInfo
- Publication number
- GB566259A GB566259A GB10310/43A GB1031043A GB566259A GB 566259 A GB566259 A GB 566259A GB 10310/43 A GB10310/43 A GB 10310/43A GB 1031043 A GB1031043 A GB 1031043A GB 566259 A GB566259 A GB 566259A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequencies
- frequency
- june
- passed
- radio transmission
- 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 abstract 2
- 238000005562 fading Methods 0.000 abstract 1
- 230000011664 signaling Effects 0.000 abstract 1
Classifications
-
- 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
- H04B14/006—Angle modulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
566,259. Wireless signalling. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. June 25, 1943, No. 10310. Convention date, June 26, 1942. [Class 40 (v)] To reduce fading in radio transmission, signals are sent on different carrier frequencies produced by mixing a strong unmodulated carrier wave fs, Fig. 1, with a weaker signalmodulated wave of slightly different frequency fw, the combination being passed through a limiter C to remove amplitude modulation. The Specification indicates that the limiter output comprises three waves, one of frequency fs and the others separated therefrom on either side by an amount equal to the difference between fs and fw. The two side frequencies may be amplified and frequency-multiplied at D before being radiated. Each of them carries a phase modulation corresponding to the original modulation applied to the source fw. At the receiver, Fig. 2, the two frequencies are received in a selective amplifier E, are heterodyned to lower frequencies at H, and are then separated by tuned I.F. amplifiers K, L and passed to phase detectors M, N, the signal being derived jointly from the detector outputs. Specification 531,150, [Group XXXIX], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US566259XA | 1942-06-26 | 1942-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB566259A true GB566259A (en) | 1944-12-20 |
Family
ID=22005635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10310/43A Expired GB566259A (en) | 1942-06-26 | 1943-06-25 | Improvements in radio transmission systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB566259A (en) |
-
1943
- 1943-06-25 GB GB10310/43A patent/GB566259A/en not_active Expired
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