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GB1030476A - Improvements in or relating to electric automatic frequency control systems - Google Patents

Improvements in or relating to electric automatic frequency control systems

Info

Publication number
GB1030476A
GB1030476A GB3252062A GB3252062A GB1030476A GB 1030476 A GB1030476 A GB 1030476A GB 3252062 A GB3252062 A GB 3252062A GB 3252062 A GB3252062 A GB 3252062A GB 1030476 A GB1030476 A GB 1030476A
Authority
GB
United Kingdom
Prior art keywords
oscillator
mixer
automatic frequency
output
frequency control
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
GB3252062A
Inventor
Gordon Maurice West
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of GB1030476A publication Critical patent/GB1030476A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/04—Aerobic processes using trickle filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1,030,476. Automatic frequency control. GENERAL ELECTRIC CO. Ltd. Aug. 16, 1963 [Aug. 23, 1962], No. 32520/62. Heading H3A. In an A.F.C. system for a variable frequency oscillator 1, the output of the oscillator is mixed with a selected harmonic of a first reference oscillator 6 in a mixer 7 which supplies an output which is mixed with a selected harmonic of a second reference oscillator 9 in a second mixer 11 and the output of this mixer is compared in a phase detector 13 with an oscillation generated by oscillator 4 to provide a D.C. voltage to control the oscillator 1 via reactance valve 14. The reference oscillators may operate at 1 Mc/s. and 100 kc/s. respectively and their harmonies are selected by manual controls 2 and 3 which control respectively the tuning of band-pass filters 5 and 10. Oscillator 4 is an interpolation oscillator and its frequency may be controlled by an arrangement, Fig. 3 (not shown), similar to that shown.
GB3252062A 1963-11-15 1962-08-23 Improvements in or relating to electric automatic frequency control systems Expired GB1030476A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4520063A GB1082661A (en) 1963-11-15 1963-11-15 Improved plant and processes for the treatment of effluent and sewage

Publications (1)

Publication Number Publication Date
GB1030476A true GB1030476A (en) 1966-05-25

Family

ID=10436269

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3252062A Expired GB1030476A (en) 1963-11-15 1962-08-23 Improvements in or relating to electric automatic frequency control systems
GB4520063A Expired GB1082661A (en) 1962-03-08 1963-11-15 Improved plant and processes for the treatment of effluent and sewage

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB4520063A Expired GB1082661A (en) 1962-03-08 1963-11-15 Improved plant and processes for the treatment of effluent and sewage

Country Status (3)

Country Link
BE (2) BE655819A (en)
GB (2) GB1030476A (en)
NL (2) NL6413290A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215540A (en) * 1988-03-15 1989-09-20 Stc Plc Frequency synthesisers

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3032869A1 (en) * 1980-09-01 1982-04-15 Linde Ag, 6200 Wiesbaden METHOD AND DEVICE FOR ANAEROBIC BIOLOGICAL PURIFICATION OF WASTEWATER
US5980738A (en) * 1995-10-04 1999-11-09 Monsanta Company Porous polymeric biosupports
US6045700A (en) * 1996-07-29 2000-04-04 Solutia Inc. Retrievable organic carbon scavengers for cleaning of contaminated surface water sediments

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2215540A (en) * 1988-03-15 1989-09-20 Stc Plc Frequency synthesisers
GB2215540B (en) * 1988-03-15 1992-07-22 Stc Plc Frequency synthesiser

Also Published As

Publication number Publication date
NL6413290A (en) 1965-07-26
NL289852A (en)
BE655819A (en) 1965-05-17
BE629271A (en)
GB1082661A (en) 1967-09-06

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