GB537937A - Improvements in diversity systems of radio reception - Google Patents

Improvements in diversity systems of radio reception

Info

Publication number
GB537937A
GB537937A GB4884/40A GB488440A GB537937A GB 537937 A GB537937 A GB 537937A GB 4884/40 A GB4884/40 A GB 4884/40A GB 488440 A GB488440 A GB 488440A GB 537937 A GB537937 A GB 537937A
Authority
GB
United Kingdom
Prior art keywords
receiver
pair
potential
valves
current
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
GB4884/40A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph 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 filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB537937A publication Critical patent/GB537937A/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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching

Landscapes

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

Abstract

537,937. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 15, 1940, No. 4884. Convention date, March 15, 1939. [Class 40 (v)] In a diversity receiving system, means responsive to a voltage dependent on the amplitude of signals applied to the receiver are used for selectively connecting the input of the receiver to one or other of a pair of antennae. The input 4 of a receiver 1 may be selectively connected to either of a pair of antennae 5, 6 by means of a relay 7 having opposed windings 9, 10 arranged in the anode circuits of a pair of gas discharge valves 20, 21 having control grids connected in parallel to a source of negative A.V.C. potential 3. As shown antenna 5 is in use and valve 20 is drawing current from source 22. If now the signal on 5 fades the grids of valves 20, 21 become less negative until suddenly valve 21 starts to draw current. The fall in potential across 24 acting through coupling condenser 25 reduces the potential of the anode of 20 so that it ceases to conduct. The current through 21 acts on coil 10 to switch over to antenna 6. In a modification the antennae are connected to the receiver through tuned circuits and a pair of thermionic valves which are alternately biased to cut off by the current through the discharge tubes 20, 21. In a further modification, the control potential for the grids of the gas discharge tubes 20, 21 depends on the differential effect of the rectified carrier and audio frequency in the received signal, and operates to switch over the antenna when the carrier has faded so as to produce more than 100 per cent modulation. In all cases, time constant circuits may be provided in the grid circuit of valves 20, 21 to prevent oscillation.
GB4884/40A 1939-03-15 1940-03-15 Improvements in diversity systems of radio reception Expired GB537937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US261948A US2243118A (en) 1939-03-15 1939-03-15 Automatic antenna switching diversity system

Publications (1)

Publication Number Publication Date
GB537937A true GB537937A (en) 1941-07-14

Family

ID=22995563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4884/40A Expired GB537937A (en) 1939-03-15 1940-03-15 Improvements in diversity systems of radio reception

Country Status (2)

Country Link
US (1) US2243118A (en)
GB (1) GB537937A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969473C (en) * 1953-04-30 1958-06-04 Tesla Np Device for the interference-free reception of electromagnetic waves by means of a single receiver and two antennas with different reception properties
DE1087644B (en) * 1957-01-31 1960-08-25 Standard Elektrik Lorenz Ag Circuit arrangement for multiple reception with at least two spatially separated antennas and a receiver
GB2255475A (en) * 1991-04-15 1992-11-04 Gen Electric Co Plc Diversity radio receiver.

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447057A (en) * 1943-05-06 1948-08-17 Rca Corp Diversity receiving system
US2751494A (en) * 1946-03-18 1956-06-19 John W Gray Control circuit
US2485576A (en) * 1947-04-19 1949-10-25 Fed Telecomm Lab Inc Sector antenna switching
US2729741A (en) * 1951-10-10 1956-01-03 Itt Diversity reception system
DE1048960B (en) * 1956-11-17 1959-01-22 Telefunken Gmbh Switching device for receiving systems with several antennas and one receiver
US3037113A (en) * 1959-10-12 1962-05-29 Motorola Inc Control system
US4499606A (en) * 1982-12-27 1985-02-12 Sri International Reception enhancement in mobile FM broadcast receivers and the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969473C (en) * 1953-04-30 1958-06-04 Tesla Np Device for the interference-free reception of electromagnetic waves by means of a single receiver and two antennas with different reception properties
DE1087644B (en) * 1957-01-31 1960-08-25 Standard Elektrik Lorenz Ag Circuit arrangement for multiple reception with at least two spatially separated antennas and a receiver
GB2255475A (en) * 1991-04-15 1992-11-04 Gen Electric Co Plc Diversity radio receiver.
US5204980A (en) * 1991-04-15 1993-04-20 The General Electric Company, P.L.C. Radio receiver systems
GB2255475B (en) * 1991-04-15 1995-03-01 Gen Electric Co Plc Diversity radio receiver systems

Also Published As

Publication number Publication date
US2243118A (en) 1941-05-27

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