Title:
DISTRIBUTION CIRCUIT DEVICE OF ANTENNA SIGNAL
Document Type and Number:
Japanese Patent JPH01243614
Kind Code:
A
Abstract:
PURPOSE: To avoid faults without help from a special circuit by connecting an attenuating device between an antenna signal amplifier and an input end of load that is connected to a modulator and making the trap frequency of the attenuating device coincide with a modulator frequency and synchronize with the frequency tuning of the modulator. CONSTITUTION: An attenuating device 14 is connected between an antenna signal preamplifier 4 and an input end of load 9 that is connected to a modulator 12. The trap frequency of the device 14 is equal to the modulator frequency and also synchronizes with the frequency tuning of the modulator 12. Then, an antenna signal is optimally lowered without depending on the tuning state of an oscillator, and each interference between the antenna signal and a modulating signal is lost. By this, a circuit device for distributing an antenna signal that does not have each interference between the antenna signal and the modulating signal can be acquired with no need of a special circuit.
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Inventors:
GERUHARUTO MAIYAA
BERUTORAMU FUITSUSHIYAA
BERUTORAMU FUITSUSHIYAA
Application Number:
JP20748488A
Publication Date:
September 28, 1989
Filing Date:
August 23, 1988
Export Citation:
Assignee:
THOMSON BRANDT GMBH
International Classes:
H03H11/36; H04N5/76; H04N5/775; H04N5/44; (IPC1-7): H03H11/36; H04N5/44
Attorney, Agent or Firm:
Toshio Yano (1 outside)