GB557889A - Improvements in frequency or phase modulation systems - Google Patents

Improvements in frequency or phase modulation systems

Info

Publication number
GB557889A
GB557889A GB943642A GB943642A GB557889A GB 557889 A GB557889 A GB 557889A GB 943642 A GB943642 A GB 943642A GB 943642 A GB943642 A GB 943642A GB 557889 A GB557889 A GB 557889A
Authority
GB
United Kingdom
Prior art keywords
frequency
phase modulation
line
mixer
oscillations
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
GB943642A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Priority to GB943642A priority Critical patent/GB557889A/en
Publication of GB557889A publication Critical patent/GB557889A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/09—Modifications of modulator for regulating the mean frequency

Landscapes

  • Transmitters (AREA)

Abstract

557,889. Frequency and phase modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. (Radio Corporation of America). July 7, 1942, No. 9436. [Class 40 (v)] In a frequency or phase modulation system, the modulated oscillations are applied together with an unmodulated oscillation of a different frequency to one end of a phase-shifting line, the other end of which is connected to a mixer to produce beat frequency currents for application to the load. As shown, a line-stabilized oscillator 17 is frequency modulated by a variable reactance 15 controlled through a suitable network 13 by the signal input 19. An unmodulated oscillation of different frequency is produced by a crystalcontrolled source 1 and after frequency multiplication at 3 is applied together with the FM wave from 17 to one end of a long line 5. At the other end, the oscillations are applied to a mixer 7, and the resulting beat frequency is passed to an aerial 11, with if desired a frequency multiplier 9 interposed.
GB943642A 1942-07-07 1942-07-07 Improvements in frequency or phase modulation systems Expired GB557889A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB943642A GB557889A (en) 1942-07-07 1942-07-07 Improvements in frequency or phase modulation systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB943642A GB557889A (en) 1942-07-07 1942-07-07 Improvements in frequency or phase modulation systems

Publications (1)

Publication Number Publication Date
GB557889A true GB557889A (en) 1943-12-09

Family

ID=9871937

Family Applications (1)

Application Number Title Priority Date Filing Date
GB943642A Expired GB557889A (en) 1942-07-07 1942-07-07 Improvements in frequency or phase modulation systems

Country Status (1)

Country Link
GB (1) GB557889A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1268686B (en) * 1962-04-25 1968-05-22 Raytheon Co Control circuit for tuning oscillators as a function of the frequency of a reference oscillation, especially for radio distance measuring systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1268686B (en) * 1962-04-25 1968-05-22 Raytheon Co Control circuit for tuning oscillators as a function of the frequency of a reference oscillation, especially for radio distance measuring systems
DE1268686C2 (en) * 1962-04-25 1968-12-12 Raytheon Co Control circuit for tuning oscillators as a function of the frequency of a reference oscillation, especially for radio distance measuring systems

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