搜索 - 科创

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引用虎哥:飞机上要适度担心本振泄露，对于零中频接收机，本振就等于接收频率，由于距离飞机接收机很近，较小的信号就可能对机上接收机造成干扰。不过由于飞机机舱的屏蔽，该风险不大。具体要参考相应SDR的指标...

当时美国人真舍得用料。现在这仪器可以缩小很多，瑞士一家公司就做了个20G的信号源，体积很小也很轻，性能和安捷伦的相仿。最大的问题在于谐波的滤波，测试发现即使是安捷伦的仪器，在某些频率上sub谐波分量甚...

曾经陪Cisco总部的工程师Tony（加拿大籍）吃晚饭，然后打麻将，此君摸出来张『一万』，捏着牌突然冒出句“一万（很生硬的中国话），five hundred thousand minute”陪打麻将的...

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