GB393415A - Improvements in or relating to receivers for modulated high frequency waves - Google Patents

Improvements in or relating to receivers for modulated high frequency waves

Info

Publication number
GB393415A
GB393415A GB15956/32A GB1595632A GB393415A GB 393415 A GB393415 A GB 393415A GB 15956/32 A GB15956/32 A GB 15956/32A GB 1595632 A GB1595632 A GB 1595632A GB 393415 A GB393415 A GB 393415A
Authority
GB
United Kingdom
Prior art keywords
logarithmic
rectifier stage
rectifier
output
june
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
GB15956/32A
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.)
Telefunken AG
Original Assignee
Telefunken AG
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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 Telefunken AG, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB393415A publication Critical patent/GB393415A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
    • H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/004—Amplitude modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Hybrid Cells (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Transmitters (AREA)
  • Rectifiers (AREA)

Abstract

393,415. Valve detecting circuits. TELEFUNKEN GES. FœR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. June 6, 1932, No. 15956. Convention date, June 6, 1931. [Class 40 (v).] In order to provide automatic gain control in a wireless receiver, the rectifier stage is continuously in operation (i.e. not quenched) and the relation between the input voltage and output current is logarithmic so that the lowfrequency output is proportional to the degree of modulation of the input high-frequency wave and independent of its mean amplitude. The rectifier stage may include a photoelectric cell activated by a light source modulated by the signal input, as the current output from such a cell is approximately a logarithmic function of the light strength ; alternatively a gas discharge tube may be utilized as the rectifier by virtue of its saturation phenomena. The Figure shows a rectifier stage employing ordinary thermionic valves, which normally exhibit the required logarithmic characteristic over a small part of the upper bend of their characteristic curves. The useful range is extended by employing several valves 1, 2, 3 in parallel and biased to different points on their characteristics by batteries 9, 10, 11 and chokes 6, 7, 8.
GB15956/32A 1931-05-18 1932-06-06 Improvements in or relating to receivers for modulated high frequency waves Expired GB393415A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DET38879D DE560227C (en) 1931-05-18 1931-05-18 Method for transmitting messages by means of high frequency waves
DET38969D DE580991C (en) 1931-05-18 1931-06-06 Circuit for receiving modulated high-frequency waves
DET39009D DE583864C (en) 1931-05-18 1931-06-17 Circuit for receiving modulated high-frequency waves
DET40186D DE618797C (en) 1931-05-18 1932-02-08 Circuit for receiving modulated high-frequency waves

Publications (1)

Publication Number Publication Date
GB393415A true GB393415A (en) 1933-06-08

Family

ID=32034272

Family Applications (3)

Application Number Title Priority Date Filing Date
GB15956/32A Expired GB393415A (en) 1931-05-18 1932-06-06 Improvements in or relating to receivers for modulated high frequency waves
GB17221/32A Expired GB393421A (en) 1931-05-18 1932-06-17 Improvements in or relating to receivers for modulated high frequency waves
GB3903/33A Expired GB413402A (en) 1931-05-18 1933-02-08 Improvements in or relating to modulated carrier wave receivers

Family Applications After (2)

Application Number Title Priority Date Filing Date
GB17221/32A Expired GB393421A (en) 1931-05-18 1932-06-17 Improvements in or relating to receivers for modulated high frequency waves
GB3903/33A Expired GB413402A (en) 1931-05-18 1933-02-08 Improvements in or relating to modulated carrier wave receivers

Country Status (4)

Country Link
US (2) US2031072A (en)
DE (4) DE560227C (en)
FR (2) FR730942A (en)
GB (3) GB393415A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE758211C (en) * 1937-02-11 1953-02-09 Radio Transmission Equipment L Device for displaying the deviation of a vehicle from a course line
US2515187A (en) * 1942-04-09 1950-07-18 William R Bliss Wide dynamic range amplifying and demodulating system
US2577506A (en) * 1945-07-09 1951-12-04 Logan M Belleville Amplifier
US2662978A (en) * 1945-11-29 1953-12-15 Philco Corp Logarithmic transducer
US2548913A (en) * 1946-04-17 1951-04-17 Edmund D Schreiner Radio receiver with logarithmic response circuit
US2663015A (en) * 1946-06-11 1953-12-15 Philco Corp Object location system employing logarithmic transducer
US2705794A (en) * 1946-06-11 1955-04-05 Philco Corp Signal modifying apparatus for eliminating variations as a function of one or more independent variables
US2713162A (en) * 1950-12-14 1955-07-12 Rca Corp Pulse receiver with logarithmic amplifier and base clipping detector
US2823303A (en) * 1953-10-29 1958-02-11 Hoffman Electronics Corp Compressor circuits for panoramic receivers
DE962271C (en) * 1954-11-12 1957-04-18 Lorenz C Ag Circuit arrangement for frequency modulation
NL215975A (en) * 1956-04-11
GB933934A (en) * 1960-12-08 1963-08-14 Marconi Wireless Telegraph Co Improvements in or relating to frequency varying circuit arrangements

Also Published As

Publication number Publication date
US2014509A (en) 1935-09-17
GB413402A (en) 1934-07-19
US2031072A (en) 1936-02-18
DE580991C (en) 1933-07-19
FR730942A (en) 1932-08-26
DE560227C (en) 1932-09-29
GB393421A (en) 1933-06-08
DE618797C (en) 1935-09-17
DE583864C (en) 1933-09-11
FR43009E (en) 1934-01-25

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