GB628901A - Improvements in or relating to frequency determining circuits for high frequency oscillators - Google Patents

Improvements in or relating to frequency determining circuits for high frequency oscillators

Info

Publication number
GB628901A
GB628901A GB13661/47A GB1366147A GB628901A GB 628901 A GB628901 A GB 628901A GB 13661/47 A GB13661/47 A GB 13661/47A GB 1366147 A GB1366147 A GB 1366147A GB 628901 A GB628901 A GB 628901A
Authority
GB
United Kingdom
Prior art keywords
resistor
diode
capacitor
series
frequency
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
GB13661/47A
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.)
Westinghouse Electric International Co
Original Assignee
Westinghouse Electric International 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
Application filed by Westinghouse Electric International Co filed Critical Westinghouse Electric International Co
Publication of GB628901A publication Critical patent/GB628901A/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

Abstract

628,901. Frequency modulation. WESTING- HOUSE ELECTRIC INTERNATIONAL CO. May 21, 1947, No. 13661. Convention date, June 25, 1946. [Class 40 (v)] In a resonant circuit in which the tuning is varied by means of a capacitor in series with a variable resistor, the resistor comprises a diode, metal rectifier or other device not having a control grid, the current through which is controlled by a series-connected grid controlled tube. As applied to a frequency-modulated oscillator, the two halves of the tank circuit 17, 18, 19 of a push-pull pair of oscillators 1, 2 are shunted by circuits comprising effectively capacitor 21 in series with diode 22 and resistor 26 in parallel, and capacitor 24 in series with diode 23 and resistor 27 in parallel. The reactances of byepass capacitors 34, 35 are negligible at the operating frequency. The value of resistor 26 is such that the impedance of 26 and diode 22 in parallel is equal to the reactance of capacitor 21 at the unmodulated frequency of the oscillator. Resistor 27 is similarly chosen. The internal resistances of the diodes are varied in accordance with the modulating signal at 32 by passing the anode current of the amplifier 28 through them. According to the Specification as open to inspection under Sect. 91 the variable resistor may be a carbon microphone. This subjectmatter does not appear in the Specification as accepted.
GB13661/47A 1946-06-25 1947-05-21 Improvements in or relating to frequency determining circuits for high frequency oscillators Expired GB628901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US679103A US2530937A (en) 1946-06-25 1946-06-25 Frequency modulator

Publications (1)

Publication Number Publication Date
GB628901A true GB628901A (en) 1949-09-07

Family

ID=24725563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13661/47A Expired GB628901A (en) 1946-06-25 1947-05-21 Improvements in or relating to frequency determining circuits for high frequency oscillators

Country Status (4)

Country Link
US (1) US2530937A (en)
BE (1) BE474098A (en)
FR (1) FR948331A (en)
GB (1) GB628901A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977690C (en) * 1950-03-07 1968-05-22 Siemens Ag Electrical two-pole, the reactance value of which can be changed by a control variable
DE977095C (en) * 1950-03-07 1965-01-28 Siemens Ag Electrical two-pole in a circuit for frequency modulation, frequency adjustment or the adjustment of measuring bridge arrangements
US2749310A (en) * 1954-09-03 1956-06-05 Shell Dev Lubricating compositions
US3020493A (en) * 1959-02-27 1962-02-06 Hughes Aircraft Co Frequency modulation circuit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2296962A (en) * 1939-12-22 1942-09-29 Rca Corp Frequency modulation
US2354799A (en) * 1940-07-26 1944-08-01 Rca Corp Phase modulation
US2436834A (en) * 1942-11-17 1948-03-02 Edwin K Stodola Phase and frequency modulation
US2374000A (en) * 1943-03-06 1945-04-17 Rca Corp Phase modulator
US2430126A (en) * 1943-08-25 1947-11-04 Rca Corp Phase modulation

Also Published As

Publication number Publication date
BE474098A (en)
FR948331A (en) 1949-07-28
US2530937A (en) 1950-11-21

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