GB620828A - Improvements in devices for the keying of a radio transmitter by means of tubes - Google Patents

Improvements in devices for the keying of a radio transmitter by means of tubes

Info

Publication number
GB620828A
GB620828A GB2601/47A GB260147A GB620828A GB 620828 A GB620828 A GB 620828A GB 2601/47 A GB2601/47 A GB 2601/47A GB 260147 A GB260147 A GB 260147A GB 620828 A GB620828 A GB 620828A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
keying
carrier
intervals
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
GB2601/47A
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 GB620828A publication Critical patent/GB620828A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Selective Calling Equipment (AREA)

Abstract

620,828. Keying carrier frequencies. STANDARD TELEPHONES & CABLES, Ltd. Jan. 28, 1947, No. 2601. Convention date, April 11, 1945. [Class 40 (v)] In a radio transmitter of the kind employing a keying-valve V2 connected in series with a carrier amplifier valve V1, the screen-grid and suppressor-grid of the valve V2 are supplied by means of the potentiometer P with the same D.C. voltage as the anode during the marking intervals. During spacing-intervals, the valve V2 is blocked by negative voltage applied at B to its control grid, and the fall in screen current applies a positive voltage to the grid of a valve V3 which thus forms a low-resistance shunt across the anode circuit of the carrier amplifier V1 and prevents or reduces the passing on of carrier excitation to the subsequent stages C. During marking intervals, the valve V3 is blocked by its grid being biassed negatively relatively to its cathode. Two valves of lower power, connected in parallel, may replace the valve V2.
GB2601/47A 1945-04-11 1947-01-28 Improvements in devices for the keying of a radio transmitter by means of tubes Expired GB620828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR620828X 1945-04-11

Publications (1)

Publication Number Publication Date
GB620828A true GB620828A (en) 1949-03-30

Family

ID=8984665

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2601/47A Expired GB620828A (en) 1945-04-11 1947-01-28 Improvements in devices for the keying of a radio transmitter by means of tubes

Country Status (1)

Country Link
GB (1) GB620828A (en)

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