GB887220A - Frequency modulating apparatus - Google Patents

Frequency modulating apparatus

Info

Publication number
GB887220A
GB887220A GB3863859A GB3863859A GB887220A GB 887220 A GB887220 A GB 887220A GB 3863859 A GB3863859 A GB 3863859A GB 3863859 A GB3863859 A GB 3863859A GB 887220 A GB887220 A GB 887220A
Authority
GB
United Kingdom
Prior art keywords
frequency
modulation
nov
frequency modulating
modulating apparatus
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
GB3863859A
Inventor
Roger John Meredith
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB3863859A priority Critical patent/GB887220A/en
Publication of GB887220A publication Critical patent/GB887220A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Amplifiers (AREA)

Abstract

887,220. Frequency modulation. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Nov. 8, 1960 [Nov. 13, 1959], No. 38638/59. Drawings to Specification. Class 40(5). The frequency spectrum of a frequency modulated wave is examined with an oscilloscope and the modulation amplitude from an amplifier adjusted until the fundamental or a particular side-band frequency component is absent (this happening at a particular modulation index m, i.e. ratio frequency swing to modulation frequency expressed by Bessel functions J.(m), J.(m) . . .) whereupon a calibrated attenuator is adjusted to give the frequency swing required.
GB3863859A 1959-11-13 1959-11-13 Frequency modulating apparatus Expired GB887220A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3863859A GB887220A (en) 1959-11-13 1959-11-13 Frequency modulating apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3863859A GB887220A (en) 1959-11-13 1959-11-13 Frequency modulating apparatus

Publications (1)

Publication Number Publication Date
GB887220A true GB887220A (en) 1962-01-17

Family

ID=10404756

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3863859A Expired GB887220A (en) 1959-11-13 1959-11-13 Frequency modulating apparatus

Country Status (1)

Country Link
GB (1) GB887220A (en)

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