2018年12月18日

2018.11.27 元器件选型(2)- 连接器

摘要： 1.连接器Connector key parameter： Pitch:间距如2.54mm 2.0mm 0.65mm no. of pole：PIN针 Latch：卡锁 Shrouded 覆盖 Polarised:极性 Row: single,Double Entry:插入方式Top Side 拉阅读全文

posted @ 2018-12-18 20:23 keep1 阅读(205) 评论(0) 推荐(0)

L194

摘要： For many of us, asking for help is it difficult concept. We may feel as if we are admitting a weakness that theworld would not have known about, had w 阅读全文

posted @ 2018-12-18 09:07 keep1 阅读(300) 评论(0) 推荐(0)

2018年12月17日

L193

摘要： Real generosity toward the future lies in giving all to the present.将一切奉献给当下，就是对未来的真正慷慨。The wheels of the car rubed on the land with seveal lines draw 阅读全文

posted @ 2018-12-17 08:44 keep1 阅读(158) 评论(0) 推荐(0)

2018年12月15日

L192 Virgin Galactic Completes Test of Spaceship to Carry Tourists

摘要： Virgin Galactic says its spacecraft designed to launch tourists into space completed an important test flight on Thursday.The rocket ship, called Spac 阅读全文

posted @ 2018-12-15 09:45 keep1 阅读(244) 评论(0) 推荐(0)

2018年12月7日

2018.12.7 L190

摘要： China called for the immediate release of Meng Wanzhou, chief financial officer of Huawei Technologies Co, on Thursday after Canadian authorities arre 阅读全文

posted @ 2018-12-07 10:28 keep1 阅读(150) 评论(0) 推荐(0)

2018年12月5日

L188

摘要： This is the view from the instrument deployment camera of InSight, America’s latest probe to Mars, which landed safely on November 26th. InSight joins 阅读全文

posted @ 2018-12-05 08:48 keep1 阅读(252) 评论(0) 推荐(0)

2018年12月3日

2018.12.2 频谱分析

摘要： 1基础概念：时域：用示波器，观察信号的波形信息（幅度周期频率）频域：频谱分析仪，观察信号的频率分布信息（频率功率谐波杂波噪声干扰失真）调制域：适量分析仪，信号的矢量信息（幅度误差，矢量误差，相位误差） 2 频谱仪测试原理：工作原理如下图 3仪器设置 RBW设置对测试的影响阅读全文

posted @ 2018-12-03 16:07 keep1 阅读(1256) 评论(0) 推荐(0)

L187 DKK2

摘要： Why can millions of hairs grow from our heads, and yet our palms手掌 and the soles of our feet are as bare as anything? It all comes down to a special m 阅读全文

posted @ 2018-12-03 12:00 keep1 阅读(223) 评论(0) 推荐(0)

2018年12月1日

L185 Ocean Shock

摘要： This is part of "Ocean Shock," a Reuters series exploring climate change's impact on sea creatures and the people who depend on them. Norway has built 阅读全文

posted @ 2018-12-01 09:11 keep1 阅读(132) 评论(0) 推荐(0)

2018年11月30日

2018.11.29 射频基础2

摘要： 5滤波器：二项式：单调的衰减曲线，但无法实现陡峭的过度衰减变化。切比雪夫：衰减曲线的纹波在通带和阻带内保持相等的幅度。椭圆函数：通带和阻带间的过度变化最陡峭，但有纹波，实现比较复杂、影响参数： RF插入损耗：描述功率响应幅度和0dB基准的差值。波纹：响应幅度的最大小值之差，表征平坦度。带阅读全文

posted @ 2018-11-30 19:28 keep1 阅读(207) 评论(0) 推荐(0)