Radio receiver

Details Radio receiver Radio receiver

1987-04-09

1989-01-31

Safourek, Benedict V.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455191, 455319, 334 55, 334 45, H04B 116, H04B 126

Patent

active

048022381

ABSTRACT:
In a radio receiver which can be switched between at least two waveranges, the coil winding (33) of the oscillator circuit (31) has a further coil winding (36) inductively coupled to it with which a capacitor (37) is arranged in parallel for limiting the waverange comprising the higher frequencies. In the case of reception of the waverange comprising the lower frequencies this capacitor (37) is effectively arranged as a padding capacitor in series with the set of plates (34) of the variable capacitor in the oscillator circuit (31) while simultaneously the further coil winding (36) is effectively arranged in series with the coil winding (33) of the oscillator circuit (31) for the purpose of extending the range and a further capacitor (38) is effectively arranged in parallel with the set of plates (34) of a variable capacitor in the oscillator circuit (31), for the purpose of shifting the waverange of higher frequencies to the waverange of lower frequencies. This switching process is carried out with a single changeover switch (32) (FIG. 1).

REFERENCES:
patent: 4602222 (1986-07-01), Wynn
patent: 4710973 (1987-12-01), Suzuki

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