发明名称 |
Radio station system |
摘要 |
In a radio station system utilizing multi-channel transmission and reception frequencies of the type comprising a transmitter and a receiver wherein the frequency difference between the transmission and reception frequencies is made to be equal to an intermediate frequency, there is provided a source of multi-frequency signal which determines the multi-channel transmission and reception frequencies. The output of the multi-frequency signal source is utilized directly as a local oscillation signal of the receiver and the frequency of the output of the multi-frequency signal source is shifted by a modulated wave having a frequency twice the intermediate frequency and the frequency shifted output is utilized as the transmission frequency.
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申请公布号 |
US4231116(A) |
申请公布日期 |
1980.10.28 |
申请号 |
US19780963431 |
申请日期 |
1978.11.24 |
申请人 |
HITACHI, LTD. |
发明人 |
SEKIGUCHI, NOBUO;FUJIWARA, YUKINARI;TOYA, MITSUO;KANEKO, YOICHI |
分类号 |
H04B1/50;(IPC1-7):H04B1/50 |
主分类号 |
H04B1/50 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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