GB499425A - Improvements in or relating to radio and television receiving apparatus - Google Patents

Improvements in or relating to radio and television receiving apparatus

Info

Publication number
GB499425A
GB499425A GB3025037A GB3025037A GB499425A GB 499425 A GB499425 A GB 499425A GB 3025037 A GB3025037 A GB 3025037A GB 3025037 A GB3025037 A GB 3025037A GB 499425 A GB499425 A GB 499425A
Authority
GB
United Kingdom
Prior art keywords
frequency
detector
selective element
carrier
frequencies
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
GB3025037A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3025037A priority Critical patent/GB499425A/en
Publication of GB499425A publication Critical patent/GB499425A/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
    • H03D1/02—Details
    • H03D1/06—Modifications of demodulators to reduce distortion, e.g. by negative feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

499,425. Valve circuits for wireless reception. GENERAL ELECTRIC CO., Ltd., and ESPLEY, D. C. Nov. 4, 1937, No. 30250. [Class 40 (v)] In a receiver for a carrier frequency exceeding 20 Mc. particularly for television, to prevent radiation by the detector, following an intermediate-frequency stage, of combination frequencies of the carrier and local oscillator which lie within the range of the modulated carrier and might be picked up by the earlier stages of the receiver, a frequency-selective element having a high impedance for the unwanted frequencies and a low impedance for the signal frequencies is connected in series with the non-linear impedance of the detector. The Figure shows a double-diode detector in which each diode path has a frequency-selective element Z1, Z2 in series, the output impedances 7, 6 being operative alternately. A further selective element Z<1> in the cathode lead may be used in addition to or instead of Z1 and Z2.
GB3025037A 1937-11-04 1937-11-04 Improvements in or relating to radio and television receiving apparatus Expired GB499425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3025037A GB499425A (en) 1937-11-04 1937-11-04 Improvements in or relating to radio and television receiving apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3025037A GB499425A (en) 1937-11-04 1937-11-04 Improvements in or relating to radio and television receiving apparatus

Publications (1)

Publication Number Publication Date
GB499425A true GB499425A (en) 1939-01-24

Family

ID=10304660

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3025037A Expired GB499425A (en) 1937-11-04 1937-11-04 Improvements in or relating to radio and television receiving apparatus

Country Status (1)

Country Link
GB (1) GB499425A (en)

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