发明授权
- 专利标题: Radio receiver
- 专利标题(中): 无线电接收机
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申请号: US36220申请日: 1987-04-09
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公开(公告)号: US4802238A公开(公告)日: 1989-01-31
- 发明人: Walter Fischer , Christian Suss
- 申请人: Walter Fischer , Christian Suss
- 申请人地址: NY New York
- 专利权人: U. S. Philips Corporation
- 当前专利权人: U. S. Philips Corporation
- 当前专利权人地址: NY New York
- 优先权: ATX2041/86 19860729
- 主分类号: H03J3/22
- IPC分类号: H03J3/22 ; H03J5/24 ; H04B1/16 ; H04B1/26
摘要:
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).
公开/授权文献
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