GB423961A - Improved single tube modulated oscillator - Google Patents

Improved single tube modulated oscillator

Info

Publication number
GB423961A
GB423961A GB2982633A GB2982633A GB423961A GB 423961 A GB423961 A GB 423961A GB 2982633 A GB2982633 A GB 2982633A GB 2982633 A GB2982633 A GB 2982633A GB 423961 A GB423961 A GB 423961A
Authority
GB
United Kingdom
Prior art keywords
condenser
resistance
circuit
modulation
anode
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
GB2982633A
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 GB2982633A priority Critical patent/GB423961A/en
Publication of GB423961A publication Critical patent/GB423961A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B7/00Generation of oscillations using active element having a negative resistance between two of its electrodes
    • H03B7/02Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance
    • H03B7/04Generation of oscillations using active element having a negative resistance between two of its electrodes with frequency-determining element comprising lumped inductance and capacitance active element being vacuum tube

Landscapes

  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

423,961. Valve generating circuits. BROWN, W. F., 29, Bell Street, Brierley Hill, Staffordshire. Oct. 27, 1933, Nos. 29826 and 32425. [Class 40 (v)] A single-valve oscillator primarily intended for testing, demonstrating, or servicing wireless receivers comprises a tetrode valve 1 preferably of the screen grid type, connected as a dynatron by biassing its screen grid to a higher positive potential than the anode. The oscillatory circuit 15, 16, 13 in the anode circuit is switched at 17 for three wave ranges. Modulation may be applied to the control grid circuit from a source 32 such as a gramophone pick-up through a transformer 27 and potentiometer 28. Alternatively self-modulation may take place with the switch 34 on contact 44 thus back-coupling the screen grid to the control-grid circuit through condenser 43 resistance 40 and inductance 41. Constant amplitude is obtained by feeding back oscillations across condenser 24 to a unilateral conductor 25 ; the rectified oscillations vary the control grid bias in such sense as to keep the oscillation amplitude constant. Condenser 30 is inserted by switch 31 only for self modulation. Resistance 4 provides normal control grid bias, from a tapping on which the output from the oscillator is taken through resistance 38 and condenser 37 to the receiver through a shielding tube. Where the supply current is obtained from batteries the radio frequency output is taken from a voltage divider comprising a condenser and high resistance connected between anode and earth. Specification 400,995 is referred to.
GB2982633A 1933-10-27 1933-10-27 Improved single tube modulated oscillator Expired GB423961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2982633A GB423961A (en) 1933-10-27 1933-10-27 Improved single tube modulated oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2982633A GB423961A (en) 1933-10-27 1933-10-27 Improved single tube modulated oscillator

Publications (1)

Publication Number Publication Date
GB423961A true GB423961A (en) 1935-02-12

Family

ID=10297805

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2982633A Expired GB423961A (en) 1933-10-27 1933-10-27 Improved single tube modulated oscillator

Country Status (1)

Country Link
GB (1) GB423961A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646531A (en) * 1951-02-13 1953-07-21 Rca Corp Electron oscillator circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646531A (en) * 1951-02-13 1953-07-21 Rca Corp Electron oscillator circuit

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