GB943837A - Improvements relating to signal relaying apparatus - Google Patents
Improvements relating to signal relaying apparatusInfo
- Publication number
- GB943837A GB943837A GB796659A GB796659A GB943837A GB 943837 A GB943837 A GB 943837A GB 796659 A GB796659 A GB 796659A GB 796659 A GB796659 A GB 796659A GB 943837 A GB943837 A GB 943837A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- sideband
- amplitude
- filter
- satellite
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
943,837. Radio signalling. ELECTRIC & MUSICAL INDUSTRIES Ltd. Feb. 24, 1960 [March 7, 1959], No. 7966/59. Heading H4L. Television or other amplitude modulated R.F. signals are transmitted to a receiver sited near a satellite transmitting station and at the receiver, after frequency reduction, the I.F. acting as a subcarrier frequency modulates a UHF carrier which is by a directional radio link transmitted to the satellite station. The latter has a filter 6 suppressing one sideband of the received carrier whose output being then amplitude as well as frequency modulated, is detected by an amplitude detector 7 to derive the amplitude modulated I.F. subcarrier. The latter may then be transposed up in frequency and transmitted from the satellite transmitter. The output of the single sideband filter 6 may be reduced in frequency by a local oscillator 13 and the I.F. amplified by tubes having in their anode circuits a pair of circuits in series respectively tuned to the I.F. and to the sideband frequency spaced from the I.F. by the amplitude modulated subcarrier frequency. The I.F. may also be applied to a filter 14 energizing an amplitude detector 15 and frequency discriminator 16 and respectively producing A.G.C. and A.F.C. control voltages. Several subcarriers may be used to produce multiplexing. Further, the sideband filter 6 may be located at the receiver sited near the satellite station so that only one sideband of the FM link is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB796659A GB943837A (en) | 1959-03-07 | 1959-03-07 | Improvements relating to signal relaying apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB796659A GB943837A (en) | 1959-03-07 | 1959-03-07 | Improvements relating to signal relaying apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB943837A true GB943837A (en) | 1963-12-11 |
Family
ID=9843202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB796659A Expired GB943837A (en) | 1959-03-07 | 1959-03-07 | Improvements relating to signal relaying apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB943837A (en) |
-
1959
- 1959-03-07 GB GB796659A patent/GB943837A/en not_active Expired
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