GB165994A - Improvements in or connected with wireless telephony and telegraphy - Google Patents

Improvements in or connected with wireless telephony and telegraphy

Info

Publication number
GB165994A
GB165994A GB1166720A GB1166720A GB165994A GB 165994 A GB165994 A GB 165994A GB 1166720 A GB1166720 A GB 1166720A GB 1166720 A GB1166720 A GB 1166720A GB 165994 A GB165994 A GB 165994A
Authority
GB
United Kingdom
Prior art keywords
grid
valve
circuit
power valve
microphone
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
GB1166720A
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.)
GEORGE ALEXANDER IRVING
HAROLD MORRIS AIREY
LESLIE ALFRED MCDOUGALD
Original Assignee
GEORGE ALEXANDER IRVING
HAROLD MORRIS AIREY
LESLIE ALFRED MCDOUGALD
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 GEORGE ALEXANDER IRVING, HAROLD MORRIS AIREY, LESLIE ALFRED MCDOUGALD filed Critical GEORGE ALEXANDER IRVING
Priority to GB1166720A priority Critical patent/GB165994A/en
Publication of GB165994A publication Critical patent/GB165994A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes

Landscapes

  • Examining Or Testing Airtightness (AREA)
  • Selective Calling Equipment (AREA)

Abstract

165,994. Crowther, H. L., and Mc- Dougald, L. A.. Airey, H. Morris-, and Irving, G. A. April 27, 1920. Modulating systems and apparatus.-In a transmission system, the power valve is (a) continuously excited by a separate high-frequency source, and (b) the potential of the grid of the power valve is varied at audible frequency by means of a microphone for telephony, or by a low-frequency oscillating valve or other source for telegraphy. As shown in Fig. 1, the plate of the power valve 6 is fed from a high-tension supply 8, whilst the grid is coupled at 11 to a separate oscillating- valve circuit 10. The audible signal frequency is superposed on the grid circuit by a microphone 12 which is coupled at 13 to the grid-filament circuit of valve 14, the anode-filament circuit of which constitutes the grid leak-resistance of the power valve 6. In alternative forms, the audible signal frequency is superposed on the grid of the power valve either by inserting the microphone transformer directly in the grid circuit of the power valve, or by placing the microphone transformer in the grid circuit of an auxiliary valve, such as 14, Fig. 1, and coupling the plate circuit of this valve directly to the grid circuit of the power valve.
GB1166720A 1920-04-27 1920-04-27 Improvements in or connected with wireless telephony and telegraphy Expired GB165994A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1166720A GB165994A (en) 1920-04-27 1920-04-27 Improvements in or connected with wireless telephony and telegraphy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1166720A GB165994A (en) 1920-04-27 1920-04-27 Improvements in or connected with wireless telephony and telegraphy

Publications (1)

Publication Number Publication Date
GB165994A true GB165994A (en) 1921-07-14

Family

ID=9990461

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1166720A Expired GB165994A (en) 1920-04-27 1920-04-27 Improvements in or connected with wireless telephony and telegraphy

Country Status (1)

Country Link
GB (1) GB165994A (en)

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