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EP0119561A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of tuning the resonant circuits of a radio receiver

Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1984-03-09
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Granted: —
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Expires: 2004-03-09
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Abstract

Abstract Translated from German Verfahren zum Abstimmen der Schwingkreise eines Nachrichtenempfangsgerätes. Mit Hilfe eines Zusatzoszillators wird eine Frequenz f D erzeugt, die mit der Empfängeroszillatorfrequenz gemischt wird, woraus drei Frequenzen fo, fo+f D , fo-f D gebildet und an den Antenneneingang gelegt werden. Am ZF-Ausgang entsteht durch Mischung die Frequenz f D , die schmalbandig ausgewertet wird. Es erfolgt ein Maximumabgleich über sämtliche HF-Kreise. Auf fo und fo+f D (N+5, N+11) werden Saugkreise abgestimmt, zur maximalen Dämpfung der Oszillatorfrequenz und der Spiegelfrequenz. Method for tuning the resonant circuits of a message receiving device. With the help of an additional oscillator, a frequency f D is generated which is mixed with the receiver oscillator frequency, from which three frequencies fo, fo + f D , fo-f D are formed and applied to the antenna input. Mixing produces the frequency f D at the IF output, which is evaluated in a narrow band. There is a maximum adjustment across all RF circuits. Suction circuits are tuned to fo and fo + f D (N + 5, N + 11) for maximum damping of the oscillator frequency and the image frequency.

Inventors

  • 👤 Gerhard Maier

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 10:59
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/28; H03J3/32; H03J7/00; H03J7/02; H03J7/04; H03J7/06; H03J7/065; H03J2200/00; H03J2200/28

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