GB437643A - Improvements in detectors for television signals - Google Patents

Improvements in detectors for television signals

Info

Publication number
GB437643A
GB437643A GB6656/34A GB665634A GB437643A GB 437643 A GB437643 A GB 437643A GB 6656/34 A GB6656/34 A GB 6656/34A GB 665634 A GB665634 A GB 665634A GB 437643 A GB437643 A GB 437643A
Authority
GB
United Kingdom
Prior art keywords
valve
anode
cathode
circuit
detector
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
GB6656/34A
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Publication of GB437643A publication Critical patent/GB437643A/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
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

437,643. Valve detecting circuits. RADIOAKT.-GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. March 2, 1934, No. 6656. Convention date, March 2, 1933. [Class 40 (v)] The carrier frequency of television signals is neutralized in or after the detector 10. The detecting-valve has two control grids 11, 12 to which the signals are applied in opposite phase. In such a circuit the carrier frequency can be removed without affecting the highest image frequency even when the two frequencies are close. One control grid 11 is connected to the anode 17 of the final valve of an intermediate-frequency amplifier, the second control grid is earthed as regards alternating-current through a condenser 18, and the cathode 15 is connected to the mid-point 21 of two equal anode resistances 8, 9 in series. Alternatively a potentiometer is connected across the anode circuit and the cathode of the detector connected to the centre. A cathode-ray tube or other light relay may be connected directly to the rectifier. According to modifications : a separate valve is used for phase reversal, Fig. 3 (not shown) ; a detector with only one control grid is used, and a potentiometer in its anode circuit is so adjusted in a balanced circuit that no carrier frequency occurs at its output tapping, Fig. 4 (not shown).
GB6656/34A 1933-03-02 1934-03-02 Improvements in detectors for television signals Expired GB437643A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE437643X 1933-03-02

Publications (1)

Publication Number Publication Date
GB437643A true GB437643A (en) 1935-11-04

Family

ID=6507058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6656/34A Expired GB437643A (en) 1933-03-02 1934-03-02 Improvements in detectors for television signals

Country Status (3)

Country Link
FR (1) FR769520A (en)
GB (1) GB437643A (en)
NL (1) NL45389C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740299C (en) * 1938-04-01 1943-10-16 Telefunken Gmbh Amplifier for a wide frequency band

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740299C (en) * 1938-04-01 1943-10-16 Telefunken Gmbh Amplifier for a wide frequency band

Also Published As

Publication number Publication date
FR769520A (en) 1934-08-28
NL45389C (en)

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