GB491437A - Improvements in radio receivers employing the homodyne principle - Google Patents

Improvements in radio receivers employing the homodyne principle

Info

Publication number
GB491437A
GB491437A GB9449/38A GB944938A GB491437A GB 491437 A GB491437 A GB 491437A GB 9449/38 A GB9449/38 A GB 9449/38A GB 944938 A GB944938 A GB 944938A GB 491437 A GB491437 A GB 491437A
Authority
GB
United Kingdom
Prior art keywords
frequency
auxiliary
pass
march
radio receivers
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
GB9449/38A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB491437A publication Critical patent/GB491437A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)

Abstract

491,437. Valve circuits for wireless reception. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. March 28, 1938, No. 9449. Convention date, March 30, 1937. [Class 40 (v)] In a superheterodyne receiver in which an auxiliary homodyne oscillator 7 feeds an auxiliary oscillation of the same phase and frequency as the intermediate-frequency to the second detector 5 and in which the auxiliary oscillator is synchronized by means of a beat oscillation obtained in a rectifier 11 by interference between even harmonics derived by frequency multiplication from the intermediatefrequency itself and the auxiliary oscillations, the desired even harmonics (or either of these) are. selected by high-pass or band-pass filters 10, 13. The filters preferably have an attenuation peak in the non-pass range corresponding to the fundamental frequency or two peaks one on either side of this frequency.
GB9449/38A 1937-03-30 1938-03-28 Improvements in radio receivers employing the homodyne principle Expired GB491437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE491437X 1937-03-30

Publications (1)

Publication Number Publication Date
GB491437A true GB491437A (en) 1938-09-01

Family

ID=6544280

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9449/38A Expired GB491437A (en) 1937-03-30 1938-03-28 Improvements in radio receivers employing the homodyne principle

Country Status (4)

Country Link
US (1) US2171678A (en)
BE (1) BE427232A (en)
FR (1) FR835862A (en)
GB (1) GB491437A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738380A (en) * 1950-02-07 1956-03-13 Murray G Crosby Exalted-carrier television receiver
BE525854A (en) * 1953-01-21
US2976409A (en) * 1956-10-19 1961-03-21 Hazeltine Research Inc Detector circuit
US3510776A (en) * 1966-02-16 1970-05-05 Motorola Inc Fm tone signal receiving circuit

Also Published As

Publication number Publication date
US2171678A (en) 1939-09-05
FR835862A (en) 1939-01-05
BE427232A (en)

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