GB546168A - Improvements in frequency stabilising circuits for frequency modulation systems - Google Patents

Improvements in frequency stabilising circuits for frequency modulation systems

Info

Publication number
GB546168A
GB546168A GB8140/41A GB814041A GB546168A GB 546168 A GB546168 A GB 546168A GB 8140/41 A GB8140/41 A GB 8140/41A GB 814041 A GB814041 A GB 814041A GB 546168 A GB546168 A GB 546168A
Authority
GB
United Kingdom
Prior art keywords
frequency
generator
valve
resistance
grid
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
GB8140/41A
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.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph Co 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB546168A publication Critical patent/GB546168A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03CMODULATION
    • H03C3/00Angle modulation
    • H03C3/02Details
    • H03C3/09Modifications of modulator for regulating the mean frequency

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

546,168. Automatic frequency control. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. June 27, 1941, No. 8140. Convention date, June 27, 1940. [Class 38 (iv)] [Also in Groups XL and XXXVI] In a frequency-modulated radio transmitter, a thermionic reactance valve 30 used for modulating the oscillation generator 4 is also used to maintain constant the mean frequency of the generator by applying a correcting voltage to a grid 36 of the reactance valve 30. Oscillations are conveyed from the generator by a lead 57 to beat with oscillations from a standard generator 50, and the resulting beats are passed through a limiting valve 58 to a circuit comprising a small condenser 72 and a resistance 74 ; a rectifier 78 shunts the resistance 74 and the resulting D.C. voltage across the resistance 74 is fed through a smoothing circuit R3, C2 to the grid 36 of the reactance valve 30. The correcting voltage rises as the beat frequency rises, owing to the effect of the circuit 72, 74, and acts on the reactance valve in such sense that the mean oscillation frequency is kept constant. The signal is applied through a transformer 40 to another grid 46 of the reactance valve to give the desired frequency modulation.
GB8140/41A 1940-06-27 1941-06-27 Improvements in frequency stabilising circuits for frequency modulation systems Expired GB546168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US546168XA 1940-06-27 1940-06-27

Publications (1)

Publication Number Publication Date
GB546168A true GB546168A (en) 1942-06-30

Family

ID=21992329

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8140/41A Expired GB546168A (en) 1940-06-27 1941-06-27 Improvements in frequency stabilising circuits for frequency modulation systems

Country Status (1)

Country Link
GB (1) GB546168A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848610A (en) * 1953-05-25 1958-08-19 Vitro Corp Of America Oscillator frequency control apparatus
DE1140969B (en) * 1960-09-30 1962-12-13 Siemens Ag Frequency control circuit for synchronizing an oscillator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848610A (en) * 1953-05-25 1958-08-19 Vitro Corp Of America Oscillator frequency control apparatus
DE1140969B (en) * 1960-09-30 1962-12-13 Siemens Ag Frequency control circuit for synchronizing an oscillator

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