External antenna device for short-wave receivers

Details External antenna device for short-wave receivers External antenna device for short-wave receivers

1998-02-06

2000-04-25

Wong, Don

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

343855, 343748, H01Q 150, H01Q 2100

Patent

active

060549653

ABSTRACT:
An external antenna device for receiving short-wave broadcasts includes an antenna circuit section consisting of a tuner in which a loop antenna element and a variable-capacity diode are high-frequency-connected to each other in parallel, and a high-frequency amplifier supplied with receive signals selected by the tuner; a first cable for connecting the antenna circuit section to a control unit; a control voltage forming circuit for generating a control voltage for the variable-capacity diode provided in the control unit, and a power source for the antenna circuit section and the control voltage forming circuit; wherein a voltage from the power source and the control voltage are supplied to the antenna circuit section via the first cable and, at the same time, a second cable for supplying a short-wave receiver with signals resulting from the passage of the output signals of the high-frequency amplifier through the first cable and control unit is provided between the control unit and the short-wave receiver

REFERENCES:
patent: 3818480 (1974-06-01), West
patent: 4381566 (1983-04-01), Kane
patent: 4573053 (1986-02-01), Mori et al.
patent: 4789866 (1988-12-01), Ohe et al.
patent: 4804968 (1989-02-01), Ohe et al.
patent: 5243356 (1993-09-01), Hama

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