GB881859A - Improvements in or relating to diversity receivers for radio telegraphy - Google Patents
Improvements in or relating to diversity receivers for radio telegraphyInfo
- Publication number
- GB881859A GB881859A GB40897/58A GB4089758A GB881859A GB 881859 A GB881859 A GB 881859A GB 40897/58 A GB40897/58 A GB 40897/58A GB 4089758 A GB4089758 A GB 4089758A GB 881859 A GB881859 A GB 881859A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- fed
- output
- modulator
- limiter
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
Abstract
881,859. Diversity receivers. SIEMENS & HALSKE A.G. Dec. 18, 1958 [Dec. 19, 1957; Jan 21, 1958], No. 40897/58. Class 40(5). In a diversity receiver for radio telegraphy, at least two aerials 1, 1<SP>1</SP> are connected to respective amplifiers 2, 2<SP>1</SP>, the gain of each being regulated in accordance with their combined A.G.C. voltages; and the output of each amplifier is fed through a respective limiter and a filter 3, 3<SP>1</SP>, tuned to a harmonic of the amplifier output, to an evaluating device 5, 5<SP>1</SP>. Each limiter 3, 3<SP>1</SP> comprises oppositely connected rectifiers adjustably biased to a predetermined threshold value, and the ninth harmonic of the amplifier output is passed by a filter to a modulator 4, 4<SP>1</SP> where it is converted to a lower frequency and then fed to a discriminator 5, 5<SP>1</SP>. If the combined signal plus noise output from any amplifier is less than the threshold value of its associated limiter, no harmonics will be selected from that amplifier. In another embodiment, Fig. 3 (not shown), the modulator outputs are combined and fed to a common evaluating device; each modulator being fed from respective oscillators one of which is frequency controlled by a phase comparison device to ensure that the modulation outputs have the same frequency and phase.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE881859X | 1957-12-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB881859A true GB881859A (en) | 1961-11-08 |
Family
ID=6831460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB40897/58A Expired GB881859A (en) | 1957-12-19 | 1958-12-18 | Improvements in or relating to diversity receivers for radio telegraphy |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1071159B (en) |
FR (1) | FR1211873A (en) |
GB (1) | GB881859A (en) |
NL (2) | NL234320A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0572859A1 (en) * | 1992-05-25 | 1993-12-08 | ALCATEL ITALIA S.p.A. | Method and device for automatic gain control in a space/angle diversity digital radio receiver |
-
0
- NL NL113414D patent/NL113414C/xx active
- NL NL234320D patent/NL234320A/xx unknown
- DE DENDAT1071159D patent/DE1071159B/de active Pending
-
1958
- 1958-12-18 GB GB40897/58A patent/GB881859A/en not_active Expired
- 1958-12-19 FR FR1211873D patent/FR1211873A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0572859A1 (en) * | 1992-05-25 | 1993-12-08 | ALCATEL ITALIA S.p.A. | Method and device for automatic gain control in a space/angle diversity digital radio receiver |
Also Published As
Publication number | Publication date |
---|---|
FR1211873A (en) | 1960-03-18 |
NL234320A (en) | |
DE1071159B (en) | |
NL113414C (en) |
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