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1. 发明授权

US4221939A Method and apparatus for determining the tuned frequency of a digital repeater 失效
标题翻译：用于确定数字中继器的调谐频率的方法和装置
公开(公告)号：US4221939A
公开(公告)日：1980-09-09
申请号：US036455
申请日：1979-05-07
申请人： Peter B. Cunningham , James C. Smith
发明人： Peter B. Cunningham , James C. Smith
IPC分类号： H04L1/24 , H04B3/46 , H04B1/60
CPC分类号： H04L1/24
摘要： An apparatus and method for determining the tuned frequency of a digital repeater (2) solely through the use of external connections. A pulse burst (30) at a preselected transmission frequency, produced by generator circuitry (4), is inserted into repeater (2) to cause the timing circuit of the same to oscillate for a predetermined time interval (25). After burst (30) and during interval (25), a plurality of sequential sampling pulses (26, 27) is fed to repeater (2) and regenerated by same. This format of burst (30) followed by sampling pulses (26, 27) is preferably repeated a number of times. Counter (10) measures the average time interval between the regenerated sampling pulses and determines the tuned frequency.
摘要翻译：仅通过使用外部连接来确定数字中继器（2）的调谐频率的装置和方法。由发生器电路（4）产生的预选传输频率的脉冲串（30）被插入到中继器（2）中，以使其定时电路振荡预定的时间间隔（25）。在脉冲串（30）和间隔（25）之后，将多个顺序采样脉冲（26,27）馈送到中继器（2）并通过相同再生。这种格式的脉冲串（30）后跟采样脉冲（26,27）优选重复多次。计数器（10）测量再生采样脉冲之间的平均时间间隔，并确定调谐频率。

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