GB663664A - Improvements in or relating to modulated carrier wave radio receiving systems - Google Patents

Improvements in or relating to modulated carrier wave radio receiving systems

Info

Publication number
GB663664A
GB663664A GB589849A GB589849A GB663664A GB 663664 A GB663664 A GB 663664A GB 589849 A GB589849 A GB 589849A GB 589849 A GB589849 A GB 589849A GB 663664 A GB663664 A GB 663664A
Authority
GB
United Kingdom
Prior art keywords
frequency
carrier
output
switch
sideband
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
GB589849A
Inventor
Charles Percy Beanland
Frederick Ian Rickaby
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB589849A priority Critical patent/GB663664A/en
Publication of GB663664A publication Critical patent/GB663664A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

663,664. Radio diversity receivers. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 11, 1949 [March 3, 1949], No. 5898/49. Class 40 (v). In a radio receiving system having a plurality of aerials, the best signal outputs for upper sideband, lower sideband, and carrier frequency are individually provided by selective means operating in accordance with normal diversity reception practice, and automatic means are provided to supply either the selected carrier output, or if this should drop below a predetermined level, oscillations from a local generator of carrier frequency, to the demodulators associated with each of the selected upper and lower sidebands. In the Figure, signals from aerial A1 after amplification and frequency conversion in frequency changer IFC1 and again in frequency changer 2FC1 are separated into upper sideband, lower sideband and carrier frequency portions respectively by filters USB1, LSB1 and CF1. Similar treatment is applied to signals from aerial A2, and in each case the strongest of the two signals is selected as in diversity reception by upper sideband selector SBS1, lower sideband selector SBS2 and carrier selector CS. The upper sideband output is applied to detector D and the lower sideband output to detector D2. If the selected carrier output is above a predetermined level, this output is supplied to detectors D1 and D2 via switch RS, but if the output is below this level, switch RS operates to connect a local oscillator CLO which is then used to supply carrier frequency oscillations to detectors D1 and D2. The operation of switch RS is controlled by a voltage derived from an automatic gain control circuit AGC which is jointly responsive to the two carrier frequency outputs. Alternatively, by means of switch SW, the switch RS may be manually operated so that the local oscillator is used continuously in place of the received carrier oscillations. An automatic frequency control circuit is used to control the frequency of the second heterodyne oscillator 2LO.
GB589849A 1949-03-03 1949-03-03 Improvements in or relating to modulated carrier wave radio receiving systems Expired GB663664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB589849A GB663664A (en) 1949-03-03 1949-03-03 Improvements in or relating to modulated carrier wave radio receiving systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB589849A GB663664A (en) 1949-03-03 1949-03-03 Improvements in or relating to modulated carrier wave radio receiving systems

Publications (1)

Publication Number Publication Date
GB663664A true GB663664A (en) 1951-12-27

Family

ID=9804688

Family Applications (1)

Application Number Title Priority Date Filing Date
GB589849A Expired GB663664A (en) 1949-03-03 1949-03-03 Improvements in or relating to modulated carrier wave radio receiving systems

Country Status (1)

Country Link
GB (1) GB663664A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811638A (en) * 1953-11-09 1957-10-29 Hoffman Electronics Corp Receiver selectively responsive to amplitude modulation, single side band or continuous wave singals
US2921188A (en) * 1956-10-17 1960-01-12 Collins Radio Co Single sideband diversity system
US2924706A (en) * 1957-10-10 1960-02-09 Itt Synchronous detector system
US3001068A (en) * 1957-08-12 1961-09-19 Nippon Electric Co F.m. reception system of high sensitivity
US3005094A (en) * 1958-09-30 1961-10-17 Rca Corp Automatic gain control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811638A (en) * 1953-11-09 1957-10-29 Hoffman Electronics Corp Receiver selectively responsive to amplitude modulation, single side band or continuous wave singals
US2921188A (en) * 1956-10-17 1960-01-12 Collins Radio Co Single sideband diversity system
US3001068A (en) * 1957-08-12 1961-09-19 Nippon Electric Co F.m. reception system of high sensitivity
US2924706A (en) * 1957-10-10 1960-02-09 Itt Synchronous detector system
US3005094A (en) * 1958-09-30 1961-10-17 Rca Corp Automatic gain control circuit

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