GB630050A - Improvements in and relating to frequency and phase modulators - Google Patents

Improvements in and relating to frequency and phase modulators

Info

Publication number
GB630050A
GB630050A GB23087/47A GB2308747A GB630050A GB 630050 A GB630050 A GB 630050A GB 23087/47 A GB23087/47 A GB 23087/47A GB 2308747 A GB2308747 A GB 2308747A GB 630050 A GB630050 A GB 630050A
Authority
GB
United Kingdom
Prior art keywords
reactance
grid
cathode
frequency
capacity
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
GB23087/47A
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.)
Space Systems Loral LLC
Original Assignee
Philco Ford Corp
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 Philco Ford Corp filed Critical Philco Ford Corp
Publication of GB630050A publication Critical patent/GB630050A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/04—Means in or combined with modulating stage for reducing amplitude modulation

Landscapes

  • Amplifiers (AREA)
  • Amplitude Modulation (AREA)

Abstract

630,050. Phase and frequency modulation. PHILCO CORPORATION. Aug. 20, 1947, No. 23087. Convention date, Sept. 25, 1946. [Class 40 (v)] Phase modulation is effected by applying a carrier wave to the grid 13 of a grid-controlled valve 10, which has a reactance 18 of one sign in its cathode lead, and a reactance 19 of opposite sign either connected or inherent between grid and cathode; and the modulating signal E is applied to a grid of the valve 10 to vary its mutual conductance, thus giving a phase-modulated carrier across the output terminals 31, 32 of the cathode reactance 18. If the reactance 19 is twice the cathode reactance 18, amplitude changes are avoided. In a modified circuit a coil in series with a blocking condenser replaces the capacity 19, and a capacity shunted by a radio-frequency choke replaces the coil 18. If the condenser 24 is of such capacity that its reactance at modulating frequencies is much smaller than the resistance 22, the modulating voltage reaching the grid is integrated, and the output wave at 31, 32 is a frequency-modulated wave.
GB23087/47A 1946-09-25 1947-08-20 Improvements in and relating to frequency and phase modulators Expired GB630050A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US699169A US2456716A (en) 1946-09-25 1946-09-25 Phase modulation system

Publications (1)

Publication Number Publication Date
GB630050A true GB630050A (en) 1949-10-04

Family

ID=24808235

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23087/47A Expired GB630050A (en) 1946-09-25 1947-08-20 Improvements in and relating to frequency and phase modulators

Country Status (2)

Country Link
US (1) US2456716A (en)
GB (1) GB630050A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2994835A (en) * 1958-01-27 1961-08-01 Hoffman Electronics Corp Stabilized regenerative q multiplier circuit or the like
US3205455A (en) * 1961-12-11 1965-09-07 Motorola Inc Transistor phase modulator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2067082A (en) * 1933-07-11 1937-01-05 Rca Corp Phase modulation
GB478708A (en) * 1936-07-21 1938-01-21 Marconi Wireless Telegraph Co Improvements in or relating to radio and other modulated carrier wave transmitters
US2397992A (en) * 1942-11-17 1946-04-09 Edwin K Stodola Electrical network

Also Published As

Publication number Publication date
US2456716A (en) 1948-12-21

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