GB571840A - Frequency modulation system - Google Patents

Frequency modulation system

Info

Publication number
GB571840A
GB571840A GB254344A GB254344A GB571840A GB 571840 A GB571840 A GB 571840A GB 254344 A GB254344 A GB 254344A GB 254344 A GB254344 A GB 254344A GB 571840 A GB571840 A GB 571840A
Authority
GB
United Kingdom
Prior art keywords
valves
anode
frequency
voltage
grids
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
GB254344A
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
Priority to GB254344A priority Critical patent/GB571840A/en
Publication of GB571840A publication Critical patent/GB571840A/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
    • H03C3/24—Angle modulation by means of variable impedance by means of a variable resistive element, e.g. tube

Landscapes

  • Telephonic Communication Services (AREA)

Abstract

571,840. Frequency modulation. STANDARD TELEPHONES & CABLES, Ltd. (International Standard Electric Corporation). Feb. 11, 1944, No. 2543. [Class 40 (v)] An oscillation generator comprising a valve 1, Fig. 2, back-coupled through an artificial line 2 ... 4, 16 ... 18 is frequency-modulated by signal voltages applied to one or more variable impedance valves 12 ... 14 connected in shunt with the shunt resistances of the artificial line. In Fig. 2 the signal voltage is applied to the grids of the triode valves 12 ... 14. In'a modilied arrangement, Fig. 3, the signal voltages are applied through a transformer 25 to the anode circuits of the shunting valves 22 ... 24, the valves being of the pentode type whose anode impedance is proportional to anode voltage. The mean frequency of oscillation is determined by the grid voltage of the valves 22 ... 24, and this is provided by a full-wave rectifier 28, 29 which is fed from the output circuit 26, 27 of the oscillator and has its load resistance 32 connected through a low-pass filter 30, 31 to the valve grids.
GB254344A 1944-02-11 1944-02-11 Frequency modulation system Expired GB571840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB254344A GB571840A (en) 1944-02-11 1944-02-11 Frequency modulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB254344A GB571840A (en) 1944-02-11 1944-02-11 Frequency modulation system

Publications (1)

Publication Number Publication Date
GB571840A true GB571840A (en) 1945-09-11

Family

ID=9741433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB254344A Expired GB571840A (en) 1944-02-11 1944-02-11 Frequency modulation system

Country Status (1)

Country Link
GB (1) GB571840A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2927735A (en) * 1956-09-19 1960-03-08 Gen Dynamics Corp Frequency-control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2927735A (en) * 1956-09-19 1960-03-08 Gen Dynamics Corp Frequency-control system

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