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GB628978A - Improvements in or relating to signalling by frequency-modulated carrier waves - Google Patents

Improvements in or relating to signalling by frequency-modulated carrier waves

Info

Publication number
GB628978A
GB628978A GB26163/46A GB2616346A GB628978A GB 628978 A GB628978 A GB 628978A GB 26163/46 A GB26163/46 A GB 26163/46A GB 2616346 A GB2616346 A GB 2616346A GB 628978 A GB628978 A GB 628978A
Authority
GB
United Kingdom
Prior art keywords
frequency
signalling
relating
carrier waves
modulated carrier
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
GB26163/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB628978A publication Critical patent/GB628978A/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
    • H03C3/09—Modifications of modulator for regulating the mean frequency

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Amplitude Modulation (AREA)
  • Transmitters (AREA)

Abstract

628,978. Automatic frequency-control systems. PHILIPS LAMPS, Ltd. Aug. 30, 1946, No. 26163. Convention date, Nov. 25, 1942. [Class 38 (iv)] [Also in Group XL (c)] Automatic synchronism of the centre frequencies of two oscillators 1, 2, frequencymodulated in push-pull, may be obtained by in part passing the oscillations through limiters 16, 17 and condensers C1, C2 to reciprocally-coupled pairs of diodes 18, 19 and 20, 21, having each in series a battery 22 and a condenser C3 common to both circuits. The arrangement is such that condenser C3 is charged and discharged simultaneously at the frequencies of oscillators 1 and 2 respectively, the resultant charge due to frequency-variations being applied to one of the modulators 4 to restore frequency synchronism.
GB26163/46A 1942-11-25 1946-08-30 Improvements in or relating to signalling by frequency-modulated carrier waves Expired GB628978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL241789X 1942-11-25

Publications (1)

Publication Number Publication Date
GB628978A true GB628978A (en) 1949-09-08

Family

ID=19780602

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26163/46A Expired GB628978A (en) 1942-11-25 1946-08-30 Improvements in or relating to signalling by frequency-modulated carrier waves

Country Status (6)

Country Link
BE (1) BE453301A (en)
CH (1) CH241789A (en)
DE (1) DE862317C (en)
FR (1) FR900074A (en)
GB (1) GB628978A (en)
NL (1) NL63613C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1273836B (en) * 1962-08-31 1968-07-25 Kent Ltd G Diode pump circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE532476A (en) * 1953-10-12

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1273836B (en) * 1962-08-31 1968-07-25 Kent Ltd G Diode pump circuit

Also Published As

Publication number Publication date
DE862317C (en) 1953-01-08
BE453301A (en)
CH241789A (en) 1946-03-31
FR900074A (en) 1945-06-19
NL63613C (en)

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