发明名称 |
Tag generator for a same-frequency repeater |
摘要 |
Spillover of RF signal from the output of a same-frequency repeater to the input is reduced by attaching a tag to the output signal. The tag is double-sideband, suppressed carrier to place two spectral spikes, one above and one below the carrier. The tag is applied to the signal in the IF. A tagged signal of variable amplitude and phase is added to the received signal so as to cancel the tag and hence the spillover signal, leaving only the desired signal. A feedback system controls the amplitude and phase of the cancelling signal.
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申请公布号 |
US4317217(A) |
申请公布日期 |
1982.02.23 |
申请号 |
US19800176895 |
申请日期 |
1980.08.11 |
申请人 |
MOTOROLA, INC. |
发明人 |
DAVIDSON, ALLEN L.;COHN, JONA |
分类号 |
H04B7/155;(IPC1-7):H04B7/14 |
主分类号 |
H04B7/155 |
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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