GB881859A - Improvements in or relating to diversity receivers for radio telegraphy - Google Patents

Improvements in or relating to diversity receivers for radio telegraphy

Info

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
Application number
GB40897/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB881859A publication Critical patent/GB881859A/en
Expired legal-status Critical Current

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.
GB40897/58A 1957-12-19 1958-12-18 Improvements in or relating to diversity receivers for radio telegraphy Expired GB881859A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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