GB698018A - Improvements in or relating to frequency modulated communication systems - Google Patents
Improvements in or relating to frequency modulated communication systemsInfo
- Publication number
- GB698018A GB698018A GB2351351A GB2351351A GB698018A GB 698018 A GB698018 A GB 698018A GB 2351351 A GB2351351 A GB 2351351A GB 2351351 A GB2351351 A GB 2351351A GB 698018 A GB698018 A GB 698018A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- source
- magnetron
- self
- heterodyne
- 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
- 241000143236 Idaea efflorata Species 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
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
- H04B7/155—Ground-based stations
- H04B7/165—Ground-based stations employing angle modulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
698,018. Automatic frequency control systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 9, 1951, No. 23513/51. Class 38 (iv). [Also in Group XL (c)] A self-excited high-frequency re-transmitter 14 of a radio relay station is constrained to follow the frequency modulation of the wave received at the station, by heterodyning both waves to the same mean intermediate frequency and utilizing the phase variation between these intermediate frequencies to regulate the instantaneous frequency of the self-excited source 14. As shown, the F.M. wave received on the aerial 10a is mixed at 10 with a heterodyne source 11, and the resulting IF is amplified at 12 and applied as one input to a phase-comparing balanced bridge 13. The other input to the bridge is an I.F. derived by mixing the output of the self-excited magnetron 14 with a second heterodyne source 17 in the mixer 16. The bridge output is applied to a frequency control element 15 associated with the magnetron 14; this element may comprise a thermionic reactance valve, or, as shown, a splitanode magnetron 40 operating as a variable capacity coupled into the cavity of the magnetron oscillator 14 through the loop 38. The change in the mean frequency of the relayed F.M. wave is determined by the difference between the frequencies of the heterodyne sources 11, 17. These may be independent crystal-controlled sources, or their frequencies may be derived by frequency conversion or multiplication from a single source. If the output carrier from the source 14 is of the same frequency as the input carrier at 10a, the same source 11 serves for heterodyning both.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2351351A GB698018A (en) | 1951-10-09 | 1951-10-09 | Improvements in or relating to frequency modulated communication systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2351351A GB698018A (en) | 1951-10-09 | 1951-10-09 | Improvements in or relating to frequency modulated communication systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB698018A true GB698018A (en) | 1953-10-07 |
Family
ID=10196833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2351351A Expired GB698018A (en) | 1951-10-09 | 1951-10-09 | Improvements in or relating to frequency modulated communication systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB698018A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016030294A3 (en) * | 2014-08-27 | 2016-04-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | A transceiver, a sudac, a method for signal processing in a transceiver, and methods for signal processing in a sudac |
-
1951
- 1951-10-09 GB GB2351351A patent/GB698018A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016030294A3 (en) * | 2014-08-27 | 2016-04-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | A transceiver, a sudac, a method for signal processing in a transceiver, and methods for signal processing in a sudac |
RU2662674C1 (en) * | 2014-08-27 | 2018-07-26 | Фраунхофер-Гезелльшафт Цур Фердерунг Дер Ангевандтен Форшунг Е.Ф. | Transceiver, sudac, signals in the transceiver processing method and signals in the sudac processing methods |
US10616010B2 (en) | 2014-08-27 | 2020-04-07 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Transceiver, a SUDAC, a method for signal processing in a transceiver, and methods for signal processing in a SUDAC |
US10917266B2 (en) | 2014-08-27 | 2021-02-09 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Transceiver, a SUDAC, a method for signal processing in a transceiver, and methods for signal processing in a SUDAC |
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