GB563385A - Improvements in or relating to signal modulating devices for radio telegraph transmitters - Google Patents

Improvements in or relating to signal modulating devices for radio telegraph transmitters

Info

Publication number
GB563385A
GB563385A GB198043A GB198043A GB563385A GB 563385 A GB563385 A GB 563385A GB 198043 A GB198043 A GB 198043A GB 198043 A GB198043 A GB 198043A GB 563385 A GB563385 A GB 563385A
Authority
GB
United Kingdom
Prior art keywords
valve
pulses
grid
halves
output valve
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
GB198043A
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.)
HAROLD SEFTON MOLYNEUX FFENNEL
VACUUM SCIENCE PRODUCTS Ltd
Original Assignee
HAROLD SEFTON MOLYNEUX FFENNEL
VACUUM SCIENCE PRODUCTS 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 HAROLD SEFTON MOLYNEUX FFENNEL, VACUUM SCIENCE PRODUCTS Ltd filed Critical HAROLD SEFTON MOLYNEUX FFENNEL
Priority to GB198043A priority Critical patent/GB563385A/en
Publication of GB563385A publication Critical patent/GB563385A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
    • H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

563,385. Valve modulating circuits. FFENNELL, H. S. MOLYNEUX-, and VACUUM-SCIENCE PRODUCTS, Ltd. Feb. 5, 1943, No. 1980. [Class 40 (v)] In a tone-modulated radio telegraphy system, the tone frequency comprises pulses of which at least the positive halves are of square form, the pulses being generated in a multi-vibrator circuit, and applied to a grid of the carrier wave generator valve, or to a grid of an output valve following that generator, so that the output valve passes current only during the positive halves of the pulses, and operates with increased efficiency. As shown, the pulses are generated in a multi-vibrator V1, and the carrier wave in a back-coupled oscillator valve V2. Both outputs are fed to the control grid 26 of the output valve V3 which grid is negatively biassed at GB - through a leak resistance 32 and radio frequency choke 25. The bias is such that only the positive halves of the pulses allow current to pass in the valve V3. Keying is effected by a switch 42 in the cathode lead of the valve V3. In a modified circuit, the pulses from V1 are applied to a grid of the generator valve V2 so as to suppress or reduce oscillation during the negative halves of the pulses, the output valve being biassed so as to be non-conducting during the negative halves.
GB198043A 1943-02-05 1943-02-05 Improvements in or relating to signal modulating devices for radio telegraph transmitters Expired GB563385A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB198043A GB563385A (en) 1943-02-05 1943-02-05 Improvements in or relating to signal modulating devices for radio telegraph transmitters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB198043A GB563385A (en) 1943-02-05 1943-02-05 Improvements in or relating to signal modulating devices for radio telegraph transmitters

Publications (1)

Publication Number Publication Date
GB563385A true GB563385A (en) 1944-08-11

Family

ID=9731457

Family Applications (1)

Application Number Title Priority Date Filing Date
GB198043A Expired GB563385A (en) 1943-02-05 1943-02-05 Improvements in or relating to signal modulating devices for radio telegraph transmitters

Country Status (1)

Country Link
GB (1) GB563385A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276137B (en) * 1964-04-10 1968-08-29 Ncr Co Transmitter that works with low energy consumption and has an oscillator stage that generates an HF carrier wave and is gated by a multivibrator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276137B (en) * 1964-04-10 1968-08-29 Ncr Co Transmitter that works with low energy consumption and has an oscillator stage that generates an HF carrier wave and is gated by a multivibrator

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