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公开(公告)号：USD306429S
公开(公告)日：1990-03-06
申请号：US925124
申请日：1986-10-30
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公开(公告)号：USD306576S
公开(公告)日：1990-03-13
申请号：US925121
申请日：1986-10-30
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公开(公告)号：US4731702A
公开(公告)日：1988-03-15
申请号：US925080
申请日：1986-10-30
CPC分类号： H05K7/186
摘要： A communication system is comprised of two or more circuit pack modules mounted onto a mounting apparatus. Each circuit module includes a plastic housing which holds a circuit board mounted therein. An equipment cabinet is formed by mounting a circuit module at each end of the mounting apparatus and utilizing a surface of each circuit module, respectively, as a side of the cabinet. A top panel of the cabinet mounts to the mounting apparatus and circuit modules and covers the circuit modules and any space therebetween. A front panel mounts to the top panel and circuit modules and serves as the front cover of the cabinet.
摘要翻译： 通信系统由安装在安装装置上的两个或多个电路板组件组成。 每个电路模块包括保持安装在其中的电路板的塑料外壳。 通过将电路模块安装在安装设备的每一端并且分别利用每个电路模块的表面作为机柜的一侧来形成设备机柜。 机柜的顶板安装到安装设备和电路模块，并覆盖电路模块及其间的任何空间。 前面板安装到顶部面板和电路模块，并用作机柜的前盖。
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公开(公告)号：US4210971A
公开(公告)日：1980-07-01
申请号：US308293
申请日：1963-09-11
CPC分类号： H04B11/00 , F02B2075/025
摘要： 1. A transmitter for use in long distance underwater communication comprig:(a) an electrostrictive transducer operable for radiating at least one hundred kilowatts of acoustic power into sea water in a frequency band fifty to one hundred cycles wide about a median frequency below five hundred cycles per second,(b) an alternating current generator for supplying essentially sinusoidal electric signal power to the transducer,(c) a dummy load approximating the load characteristics of the transducer,(d) a transformer for coupling output power of the generator to one of the transducer and dummy load,(e) a switching device between the transformer and the transducer and dummy load,(f) an engine directly coupled to the alternator and operable with said generator at a very low coefficient of fluctuation, on the order of 1 part in 80,000,(g) and means for controlling the engine speed in steps for changing the frequency of the generated power from any one of a plurality of equally spaced frequency steps within the band about six cycles apart to any other of the frequency steps within the band in less than ten seconds and then changing frequency at an essentially linear rate of two cycles per second per minute in a fixed length of time on the order of one to five minutes duration to the next higher or lower frequency step and then in less than ten seconds thereafter setting the frequency at any of the frequency steps within the band and changing frequency at an essentially linear rate in the same fixed length of time to the next higher or lower frequency step.
摘要翻译： 1.一种用于长距离水下通信的发射机，包括：（a）电致伸缩换能器，其可操作用于以五百到一百个周期宽的频带将至少一百千瓦的声功率辐射到海水中，所述频带的中值频率低于五百 （b）用于向换能器提供基本正弦电信号的交流发电机，（c）近似换能器的负载特性的虚拟负载，（d）用于将发电机的输出功率耦合到一个的变压器 （e）变压器和换能器之间的开关装置和虚拟负载，（f）直接耦合到交流发电机的发动机，并以非常低的波动系数与所述发电机一起操作，发动机的顺序为 （g）中的一部分，（g）和用于逐步控制发动机速度的装置，用于从多个等间距中的任何一个中改变发电功率的频率 在频带内的频率步长大约六个周期，在频带内的任何其他频率步长小于十秒钟内，然后以固定时间长度的每秒钟的每秒两个周期的基本线性速率改变频率 1到5分钟到下一个更高或更低的频率步长，然后在少于10秒之后，在频带内的任何频率步骤中设置频率，并以相同固定时间长度的基本线性速率改变频率 下一个更高或更低的频率步长。
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