GB607798A - Improvements in or relating to frequency-control circuits - Google Patents

Improvements in or relating to frequency-control circuits

Info

Publication number
GB607798A
GB607798A GB3573/46A GB357346A GB607798A GB 607798 A GB607798 A GB 607798A GB 3573/46 A GB3573/46 A GB 3573/46A GB 357346 A GB357346 A GB 357346A GB 607798 A GB607798 A GB 607798A
Authority
GB
United Kingdom
Prior art keywords
grid
frequency
valve
resistance
condenser
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
GB3573/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB607798A publication Critical patent/GB607798A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/24—Angle modulation by means of variable impedance by means of a variable resistive element, e.g. tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant

Abstract

607,798. Automatic control systems. PHILIPS LAMPS, Ltd. Feb. 5, 1946, No. 3573. Convention date, Feb. 8, 1945. [Class 38 (iv)] [Also in Group XL (c)] Frequency.-The frequency of a valve oscillator is maintained constant by applying a correcting voltage derived from a frequency discriminator to the grid of a discharge tube operating as a variable impedance in the grid circuit of the oscillator. The valve 1 produces oscillations by virtue of the coupling between the tuned anode circuit 2 and the coil 3 in the grid circuit. The grid leak path comprises a choke coil 7, a resistance 6 and a triode tube 5, a byepass condenser 9 shunting the elements 5, 6. Correcting voltage is applied to the terminals 10 across a resistance 8 to vary the flow of grid current in the valve. The grid condenser 4 has a value much lower than normal, and this condenser together with the internal gridcathode resistance of the valve 1 constitute a network giving a phase-shift which is variable under the control of the correcting voltage, causing a corresponding variation of the wave frequency. The system may be used for keeping the wave frequency constant when keying telegraph transmitters.
GB3573/46A 1945-02-08 1946-02-05 Improvements in or relating to frequency-control circuits Expired GB607798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE256375X 1945-02-08

Publications (1)

Publication Number Publication Date
GB607798A true GB607798A (en) 1948-09-06

Family

ID=3866663

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3573/46A Expired GB607798A (en) 1945-02-08 1946-02-05 Improvements in or relating to frequency-control circuits

Country Status (5)

Country Link
US (1) US2531301A (en)
BE (1) BE458146A (en)
CH (1) CH256375A (en)
FR (1) FR923304A (en)
GB (1) GB607798A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848610A (en) * 1953-05-25 1958-08-19 Vitro Corp Of America Oscillator frequency control apparatus
US2887579A (en) * 1953-11-19 1959-05-19 Gen Precision Lab Inc Pulse repetition frequency generator and driver
US2959745A (en) * 1957-03-06 1960-11-08 Donald D Grieg Control means for transistor oscillators
US3128462A (en) * 1959-07-02 1964-04-07 Aircraft Armaments Inc Test arrangement
US3373374A (en) * 1966-06-01 1968-03-12 Gen Precision Systems Inc Self-tunable vehicle presence detector system
US4015216A (en) * 1974-07-31 1977-03-29 Hitachi, Ltd. Frequency-voltage converter and a stabilized pulse generator using it
US8284385B2 (en) 2009-11-13 2012-10-09 Lincoln Global, Inc. Welding arc apparel with UV activated images
BR112015007550A2 (en) 2012-10-05 2017-07-04 Lincoln Global Inc arc welding device with UV or thermochromically activated images

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1683012A (en) * 1928-09-04 Thomas
GB166594A (en) * 1919-09-27 1921-07-11 Sydney Brydon Improvements in wireless telegraphy, wireless telephony and the like
DE543690C (en) * 1930-04-04 1932-02-09 Telefunken Gmbh Feedback tube generator
NL136703B (en) * 1940-02-20
US2265016A (en) * 1940-02-29 1941-12-02 Sidney Y White Electrical oscillation generator
US2349885A (en) * 1941-10-25 1944-05-30 Rca Corp Oscillation generator

Also Published As

Publication number Publication date
BE458146A (en)
US2531301A (en) 1950-11-21
CH256375A (en) 1948-08-15
FR923304A (en) 1947-07-03

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