GB584465A - An improved apparatus for varying or modulating the frequency of crystal controlled circuits - Google Patents

An improved apparatus for varying or modulating the frequency of crystal controlled circuits

Info

Publication number
GB584465A
GB584465A GB17352/44A GB1735244A GB584465A GB 584465 A GB584465 A GB 584465A GB 17352/44 A GB17352/44 A GB 17352/44A GB 1735244 A GB1735244 A GB 1735244A GB 584465 A GB584465 A GB 584465A
Authority
GB
United Kingdom
Prior art keywords
grid
valve
crystal
frequency
reactance
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
GB17352/44A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB584465A publication Critical patent/GB584465A/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

584,465. Frequency modulation. WESTERN ELECTRIC CO., Inc. Sept. 11, 1944, No. 17352. Convention date, Sept. 16, 1943. [Class 40 (v)] Relates to circuits in which a reactance valve is used to modulate or vary the frequency of a crystal-controlled oscillation generator. As shown, the piezo-crystal 2 has two electrodes 3, 4 connected between the grid and cathode of the oscillator 8 and two further electrodes 5, 6 are connected across the inductance 21 in the anode. circuit of a reactance valve 20. A tapping 31 on the inductance 21 is connected through resistance 30 and condenser 28 to the grid of valve 20 to provide appropriately phased grid voltages so that the valve simulates an inductive reactance whose mean value is controlled by the grid bias source 22 and which is modulated by the rectified output from microphone 33 applied through resistance 25 to the grid. In a modification, Fig. 8 (not shown), the crystal has two electrodes only and is connected in the oscillator grid circuit in series with a variable condenser and the anode inductance of the reactance valve. Specification 546,319, U.S.A. Specifications 2,204,762 and 2,306,909 are referred to.
GB17352/44A 1943-09-16 1944-09-11 An improved apparatus for varying or modulating the frequency of crystal controlled circuits Expired GB584465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US502560A US2424246A (en) 1943-09-16 1943-09-16 Frequency-modulated crystal oscillator

Publications (1)

Publication Number Publication Date
GB584465A true GB584465A (en) 1947-01-15

Family

ID=23998365

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17352/44A Expired GB584465A (en) 1943-09-16 1944-09-11 An improved apparatus for varying or modulating the frequency of crystal controlled circuits

Country Status (2)

Country Link
US (1) US2424246A (en)
GB (1) GB584465A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539268A (en) * 1945-04-25 1951-01-23 Motorola Inc Oscillator
GB618967A (en) * 1946-07-23 1949-03-02 Marconi Wireless Telegraph Co Improvements in or relating to piezo-electric crystal circuit arrangements
US2555959A (en) * 1946-10-18 1951-06-05 Bell Telephone Labor Inc Nonlinear reactance circuits utilizing high dielectric constant ceramics
BE478223A (en) * 1946-12-26
US2703387A (en) * 1950-11-07 1955-03-01 Rca Corp Frequency modulation
US2925562A (en) * 1956-09-28 1960-02-16 Motorola Inc Frequency modulated crystal oscillator circuit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060592A (en) * 1933-09-27 1936-11-10 Rca Corp Oscillation generator
US2296962A (en) * 1939-12-22 1942-09-29 Rca Corp Frequency modulation
NL61184C (en) * 1940-05-18
US2298436A (en) * 1940-06-05 1942-10-13 Rca Corp Frequency modulation
US2298437A (en) * 1940-06-05 1942-10-13 Rca Corp Frequency modulation
US2298438A (en) * 1940-10-17 1942-10-13 Rca Corp Frequency modulation system
US2311026A (en) * 1941-04-24 1943-02-16 Bishop Nathaniel Crystal stabilized frequency modulation system
US2343099A (en) * 1942-09-09 1944-02-29 Rca Corp Frequency modulation system

Also Published As

Publication number Publication date
US2424246A (en) 1947-07-22

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