GB868999A - Frequency modulating system for crystal oscillators - Google Patents

Frequency modulating system for crystal oscillators

Info

Publication number
GB868999A
GB868999A GB861459A GB861459A GB868999A GB 868999 A GB868999 A GB 868999A GB 861459 A GB861459 A GB 861459A GB 861459 A GB861459 A GB 861459A GB 868999 A GB868999 A GB 868999A
Authority
GB
United Kingdom
Prior art keywords
crystal
frequency
transformer
valve
cathode
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
GB861459A
Inventor
David Israel Kosowsky
Robert Walter Luscher
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.)
HERMES ELECTRONICS CO
Original Assignee
HERMES ELECTRONICS CO
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
Priority to US619574A priority Critical patent/US2913677A/en
Application filed by HERMES ELECTRONICS CO filed Critical HERMES ELECTRONICS CO
Priority to GB861459A priority patent/GB868999A/en
Priority to DEH37866A priority patent/DE1099589B/en
Priority to FR810297A priority patent/FR1241392A/en
Publication of GB868999A publication Critical patent/GB868999A/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
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit

Landscapes

  • Oscillators With Electromechanical Resonators (AREA)

Abstract

868,999. Frequency modulation. HERMES ELECTRONICS CO. March 12, 1959, No. 8614/59. Class 40(5) A frequency modulated oscillator comprises a piezo-electric crystal coupled through a transformer 27 to a feedback circuit of the oscillator comprising a variable reactance Cs, the transformer winding connected to the crystal having the larger number of turns and being resonant with the shunt capacitance of the crystal at the crystal series resonance frequency. This increases the permissible frequency swing. As shown the oscillator comprises a grounded grid valve 12 with resonant anode circuit 21, 20 coupled through a capacitor 25 to the grid of a cathode follower valve 13 whose cathode circuit is connected through a variable reactance tube capacitance Cs and a series inductor Ls to the 'crystal transformer 27 and cathode impedance 27 of the grounded grid valve, the mean value of Cs and Ls being tuned to the crystal series resonance frequency.
GB861459A 1956-10-31 1959-03-12 Frequency modulating system for crystal oscillators Expired GB868999A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US619574A US2913677A (en) 1956-10-31 1956-10-31 Frequency modulating system for crystal oscillators
GB861459A GB868999A (en) 1959-03-12 1959-03-12 Frequency modulating system for crystal oscillators
DEH37866A DE1099589B (en) 1959-03-12 1959-11-11 Frequency modulation circuit for a feedback oscillator with crystal control
FR810297A FR1241392A (en) 1959-03-12 1959-11-16 Improvements to the frequency modulation means of a crystal oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB861459A GB868999A (en) 1959-03-12 1959-03-12 Frequency modulating system for crystal oscillators

Publications (1)

Publication Number Publication Date
GB868999A true GB868999A (en) 1961-05-25

Family

ID=9855875

Family Applications (1)

Application Number Title Priority Date Filing Date
GB861459A Expired GB868999A (en) 1956-10-31 1959-03-12 Frequency modulating system for crystal oscillators

Country Status (1)

Country Link
GB (1) GB868999A (en)

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