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GB554715A - Improvements in or relating to apparatus for modulating the frequency of electrical oscillations - Google Patents

Improvements in or relating to apparatus for modulating the frequency of electrical oscillations

Info

Publication number
GB554715A
GB554715A GB3018239A GB3018239A GB554715A GB 554715 A GB554715 A GB 554715A GB 3018239 A GB3018239 A GB 3018239A GB 3018239 A GB3018239 A GB 3018239A GB 554715 A GB554715 A GB 554715A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
frequency
stem
effective length
modulating
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
GB3018239A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3018239A priority Critical patent/GB554715A/en
Publication of GB554715A publication Critical patent/GB554715A/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
    • H03C3/28—Angle modulation by means of variable impedance using variable impedance driven mechanically or acoustically
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/04—Coaxial resonators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

554,715. Frequency modulation. BLUMLEIN, A. D. Nov. 16, 1939, No. 30182. [Classes 40 (iii) and 40 (v)] Frequency-modulating apparatus for short-wave transmitters comprises a resonant concentric line structure with a diaphragm attached to its inner member so that its effective length may be varied by the signal. The structure, Fig. 1, comprises an outer cylinder 3 connected by an end plate 4 to a central member 5 the position of which is adjusted for tuning by rotating the threaded stem 6 in a fixed nut 7. Rubbing contact between the disc 4 and the stem 5 is provided by a tube 9 and contact members 10. Modulation is effected by varying the effective length of the stem 5 by attaching thereto a sleeve 19, Fig. 2, the end of which is closed by a diaphragm 13. A coil 16 supplied with signal current and moving in the gap of a magnet 17 drives the diaphragm 13 by means of the cylindrical coil support 15. The diaphragm may have a peripheral extension 22 sliding freely over the clamping ring 20. Specification 504,238 is referred to.
GB3018239A 1939-11-16 1939-11-16 Improvements in or relating to apparatus for modulating the frequency of electrical oscillations Expired GB554715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3018239A GB554715A (en) 1939-11-16 1939-11-16 Improvements in or relating to apparatus for modulating the frequency of electrical oscillations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3018239A GB554715A (en) 1939-11-16 1939-11-16 Improvements in or relating to apparatus for modulating the frequency of electrical oscillations

Publications (1)

Publication Number Publication Date
GB554715A true GB554715A (en) 1943-07-16

Family

ID=10303572

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3018239A Expired GB554715A (en) 1939-11-16 1939-11-16 Improvements in or relating to apparatus for modulating the frequency of electrical oscillations

Country Status (1)

Country Link
GB (1) GB554715A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453453A (en) * 1945-02-26 1948-11-09 Rca Corp Frequency modulation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2453453A (en) * 1945-02-26 1948-11-09 Rca Corp Frequency modulation system

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