US2539952A - Frequency modulation - Google Patents

Frequency modulation Download PDF

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Publication number
US2539952A
US2539952A US665391A US66539146A US2539952A US 2539952 A US2539952 A US 2539952A US 665391 A US665391 A US 665391A US 66539146 A US66539146 A US 66539146A US 2539952 A US2539952 A US 2539952A
Authority
US
United States
Prior art keywords
tube
anode
cathode
grid
voltage
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 - Lifetime
Application number
US665391A
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English (en)
Inventor
Hepp Gerard
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust 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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2539952A publication Critical patent/US2539952A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
US665391A 1942-07-11 1946-04-27 Frequency modulation Expired - Lifetime US2539952A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL250224X 1942-07-11

Publications (1)

Publication Number Publication Date
US2539952A true US2539952A (en) 1951-01-30

Family

ID=19781055

Family Applications (1)

Application Number Title Priority Date Filing Date
US665391A Expired - Lifetime US2539952A (en) 1942-07-11 1946-04-27 Frequency modulation

Country Status (7)

Country Link
US (1) US2539952A (de)
BE (1) BE451440A (de)
CH (1) CH250224A (de)
DE (1) DE869358C (de)
FR (1) FR896849A (de)
GB (1) GB643712A (de)
NL (2) NL65812C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683252A (en) * 1950-05-25 1954-07-06 Bendix Aviat Corp Crystal controlled angle modulation system
CN109387670A (zh) * 2017-08-07 2019-02-26 中国科学院沈阳自动化研究所 一种基于差分降噪的sicm电压调制成像装置和方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL75095C (de) * 1947-03-01
DE976238C (de) * 1953-05-28 1963-05-16 Telefunken Patent Schaltung eines rueckgekoppelten Roehrengenerators zur Frequenzmodulation mit grossem Frequenzhub
DE977479C (de) * 1953-08-20 1966-08-04 Siemens Ag Schaltungsanordnung zur Frequenzmodulation
GB757629A (en) * 1954-01-15 1956-09-19 Marconi Wireless Telegraph Co Improvements in or relating to reactance valve circuit arrangements

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2278429A (en) * 1939-12-27 1942-04-07 Rca Corp Reactance tube modulation
US2298438A (en) * 1940-10-17 1942-10-13 Rca Corp Frequency modulation system
US2350171A (en) * 1942-06-19 1944-05-30 Rca Corp Reactance controlled generator
US2351368A (en) * 1942-06-03 1944-06-13 Rca Corp Reactance tube
US2356483A (en) * 1942-07-02 1944-08-22 Philco Radio & Television Corp Frequency control system
US2394427A (en) * 1942-11-09 1946-02-05 Rca Corp Wave length modulation
US2408192A (en) * 1941-08-16 1946-09-24 Cossor Ltd A C Electrical apparatus
US2419527A (en) * 1943-02-27 1947-04-29 Gen Electric Radio frequency transmitter monitoring system and method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2278429A (en) * 1939-12-27 1942-04-07 Rca Corp Reactance tube modulation
US2298438A (en) * 1940-10-17 1942-10-13 Rca Corp Frequency modulation system
US2408192A (en) * 1941-08-16 1946-09-24 Cossor Ltd A C Electrical apparatus
US2351368A (en) * 1942-06-03 1944-06-13 Rca Corp Reactance tube
US2350171A (en) * 1942-06-19 1944-05-30 Rca Corp Reactance controlled generator
US2356483A (en) * 1942-07-02 1944-08-22 Philco Radio & Television Corp Frequency control system
US2394427A (en) * 1942-11-09 1946-02-05 Rca Corp Wave length modulation
US2419527A (en) * 1943-02-27 1947-04-29 Gen Electric Radio frequency transmitter monitoring system and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683252A (en) * 1950-05-25 1954-07-06 Bendix Aviat Corp Crystal controlled angle modulation system
CN109387670A (zh) * 2017-08-07 2019-02-26 中国科学院沈阳自动化研究所 一种基于差分降噪的sicm电压调制成像装置和方法
CN109387670B (zh) * 2017-08-07 2020-12-29 中国科学院沈阳自动化研究所 一种基于差分降噪的sicm电压调制成像装置和方法

Also Published As

Publication number Publication date
GB643712A (en) 1950-09-27
FR896849A (fr) 1945-03-05
NL106866B (de)
DE869358C (de) 1953-03-05
NL65812C (de)
BE451440A (de)
CH250224A (de) 1947-08-15

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