GB818834A - Retunable push-pull oscillator of high stability with frequency modulator - Google Patents

Retunable push-pull oscillator of high stability with frequency modulator

Info

Publication number
GB818834A
GB818834A GB30328/57A GB3032857A GB818834A GB 818834 A GB818834 A GB 818834A GB 30328/57 A GB30328/57 A GB 30328/57A GB 3032857 A GB3032857 A GB 3032857A GB 818834 A GB818834 A GB 818834A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
modulation
grids
valves
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
GB30328/57A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB818834A publication Critical patent/GB818834A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
    • H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

818,834. Frequency modulation. STANDARD TELEPHONES & CABLES Ltd. Sept. 27, 1957 [Oct. 4, 1956], No. 30328/57. Class 40 (5). A frequency-modulated oscillator comprises valves connected in parallel to a common tuned anode circuit L1, C1, C2, C3 both directly and inductively coupled to a second tuned circuit C4, C5, L2 connected between control grids of the valves so that oscillation maintaining and quadrature phase feedback are both applied to the grids, and modulation applied in push-pull to the same grids varies the relative mutual conductance of the valves and the phase of the vector sum of the two outputs, to produce frequency variation of the oscillator. A resistance R is inserted in the grid tuned circuit to increase its bandwidth. The mean frequency may be altered or stabilized by differential control voltages applied in series with the modulation. A rectifier G and smoothing circuit R-C connected to the anode circuit may apply negative feedback in series with the frequency control differential voltages to stabilize the amplitude of the oscillations generated.
GB30328/57A 1956-10-04 1957-09-27 Retunable push-pull oscillator of high stability with frequency modulator Expired GB818834A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE818834X 1956-10-04

Publications (1)

Publication Number Publication Date
GB818834A true GB818834A (en) 1959-08-26

Family

ID=6735543

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30328/57A Expired GB818834A (en) 1956-10-04 1957-09-27 Retunable push-pull oscillator of high stability with frequency modulator

Country Status (2)

Country Link
BE (1) BE561368A (en)
GB (1) GB818834A (en)

Also Published As

Publication number Publication date
BE561368A (en)

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