GB687540A - Stabilised electric wave amplifiers - Google Patents

Stabilised electric wave amplifiers

Info

Publication number
GB687540A
GB687540A GB381551A GB381551A GB687540A GB 687540 A GB687540 A GB 687540A GB 381551 A GB381551 A GB 381551A GB 381551 A GB381551 A GB 381551A GB 687540 A GB687540 A GB 687540A
Authority
GB
United Kingdom
Prior art keywords
output
circuit
input
pilot
rectified
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
GB381551A
Inventor
Charles Trevor Daly
William Frank Glover
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 GB381551A priority Critical patent/GB687540A/en
Publication of GB687540A publication Critical patent/GB687540A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

687,540. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. Feb. 16, 1951, No. 3815/51. Class 40 (iv). [Also in Group XL (c)] The invention relates to communication systems in which the gain of a repeater is controlled by a pilot wave transmitted with the signals. Such a system comprises an amplifier having a positive feed-back path between output and input to cause the amplifier to oscillate and a rectified negative feed-back path between the said input and output for the oscillation frequency, the pilot being applied to the said input for amplification extracted from the said output, rectified and then applied to the input to control the amplitude of oscilla. tion. The oscillation may then be used to operate a thermistor controlling the gain of a repeater. The anode circuit of the valve shown is tuned to 2000 c/s. by a circuit 5, 7 and positive feed-back to cause oscillation at this frequency is derived from this circuit and applied to the cathode. A further circuit 6, 16 tuned to this frequency feeds part of the output to. a voltage doubler rectifier 10, 11 and applies the rectified voltage in a negative sense to the control grid. The pilot, which has a frequency of 60 kc/s. and is also applied to the control grid, is amplified in the valve, selected by an anode tuned circuit 4, 21 and applied to a voltage doubler rectifier 22, 23, the rectified output being applied to the control grid to vary the oscillation output from circuit 5 in dependence upon the pilot amplitude. Specification 682,189 is referred to.
GB381551A 1951-02-16 1951-02-16 Stabilised electric wave amplifiers Expired GB687540A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB381551A GB687540A (en) 1951-02-16 1951-02-16 Stabilised electric wave amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB381551A GB687540A (en) 1951-02-16 1951-02-16 Stabilised electric wave amplifiers

Publications (1)

Publication Number Publication Date
GB687540A true GB687540A (en) 1953-02-18

Family

ID=9765427

Family Applications (1)

Application Number Title Priority Date Filing Date
GB381551A Expired GB687540A (en) 1951-02-16 1951-02-16 Stabilised electric wave amplifiers

Country Status (1)

Country Link
GB (1) GB687540A (en)

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