GB226843A - Improvements in and relating to electric signalling systems, particularly wireless telegraphy and telephony - Google Patents

Improvements in and relating to electric signalling systems, particularly wireless telegraphy and telephony

Info

Publication number
GB226843A
GB226843A GB1675623A GB1675623A GB226843A GB 226843 A GB226843 A GB 226843A GB 1675623 A GB1675623 A GB 1675623A GB 1675623 A GB1675623 A GB 1675623A GB 226843 A GB226843 A GB 226843A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
detector
telephony
relating
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
GB1675623A
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.)
RADIO COMM CO Ltd
Original Assignee
RADIO COMM 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 RADIO COMM CO Ltd filed Critical RADIO COMM CO Ltd
Priority to GB1675623A priority Critical patent/GB226843A/en
Publication of GB226843A publication Critical patent/GB226843A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/46—Reflex amplifiers
    • H03F3/48—Reflex amplifiers with tubes only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

226,843. Taggart, J. Scott-, and Radio Communication Co., Ltd. June 27, 1923. Thermionic amplifiers and. detector.-Relates to dual amplification circuits in which a valve is utilized to amplify high and low frequency current simultaneously. In order to prevent any inherent tendency to instability one end of the secondary T<1> of the feed-back transformer is at earth potential, the other end being connected through an inductance coil L<1> to the grid of the first valve of the receiver. A pair of telephones or a loud speaker T is inserted in the anode circuit of the first valve, and is connected through a condenser C<3> to the grid of the second or detector valve. In order to eliminate difficulties caused by the loud-speaker being at a high frequency potential relatively.to earth two extra coils L<4>, L<5>, Fig. 3, are wound over the tuned anode inductance L<2> as shown. A crystal detector may be used, coupled through a transformer to the grid of a low frequency amplifying valve. A stabilizing resistance is preferably connected across the grid and filament of the first valve.
GB1675623A 1923-06-27 1923-06-27 Improvements in and relating to electric signalling systems, particularly wireless telegraphy and telephony Expired GB226843A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1675623A GB226843A (en) 1923-06-27 1923-06-27 Improvements in and relating to electric signalling systems, particularly wireless telegraphy and telephony

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1675623A GB226843A (en) 1923-06-27 1923-06-27 Improvements in and relating to electric signalling systems, particularly wireless telegraphy and telephony

Publications (1)

Publication Number Publication Date
GB226843A true GB226843A (en) 1924-12-29

Family

ID=10083064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1675623A Expired GB226843A (en) 1923-06-27 1923-06-27 Improvements in and relating to electric signalling systems, particularly wireless telegraphy and telephony

Country Status (1)

Country Link
GB (1) GB226843A (en)

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