GB252027A - Improvements in high frequency electric signalling systems - Google Patents

Improvements in high frequency electric signalling systems

Info

Publication number
GB252027A
GB252027A GB12140/26A GB1214026A GB252027A GB 252027 A GB252027 A GB 252027A GB 12140/26 A GB12140/26 A GB 12140/26A GB 1214026 A GB1214026 A GB 1214026A GB 252027 A GB252027 A GB 252027A
Authority
GB
United Kingdom
Prior art keywords
amplifier
radiation
normally
grid
control 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
GB12140/26A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB252027A publication Critical patent/GB252027A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Microwave Amplifiers (AREA)
  • Amplifiers (AREA)

Abstract

252,027. British Thomson-Houston Co., Ltd., (Assignees of Byrnes, I. F.). May 11, 1925, [Convention date]. Thermionic modulating systems and apparatus. -Relates to wireless telephone transmitting systems in which radiation is inhibited except when speech is taking place. According to the present invention this is effected by inserting in the plate circuit of an amplifier. as distinct from the oscillator itself, an impedance which normally inhibits radiation but is reduced by the action of the speech currents to a value which permits radiation to take place. Thus in the system comprising the oscillator 2, amplifier 3, power amplifier 4, and modulator 5, the plate circuit of the amplifier 3 is normally choked by the control valve 6 which is included in the circuit and is normally blocked by a bias applied to its grid by the battery 8. When the microphone 9 is spoken into, however, the mean potential of the grid of the valve 6 is rendered more positive and radiation takes place. A choke prevents the oscillations in the control valve from modulating the amplifier. The transmitting apparatus shown may be combined with receiving apparatus as described in Specification 243,683.
GB12140/26A 1925-05-11 1926-05-11 Improvements in high frequency electric signalling systems Expired GB252027A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29304A US1631670A (en) 1925-05-11 1925-05-11 High-frequency signaling system

Publications (1)

Publication Number Publication Date
GB252027A true GB252027A (en) 1927-02-03

Family

ID=21848344

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12140/26A Expired GB252027A (en) 1925-05-11 1926-05-11 Improvements in high frequency electric signalling systems

Country Status (3)

Country Link
US (1) US1631670A (en)
DE (1) DE574254C (en)
GB (1) GB252027A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169221A (en) * 1962-02-21 1965-02-09 Itt Audio actuated switch for transceiver transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169221A (en) * 1962-02-21 1965-02-09 Itt Audio actuated switch for transceiver transmitter

Also Published As

Publication number Publication date
DE574254C (en) 1933-04-11
US1631670A (en) 1927-06-07

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