搜索 - 科创网

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内容：采用跟踪接收机，非常强的抗干扰能力）频谱显示、场强观测、点频输出**（用于判断电台性能，调试射频电路，查找干扰源）<strike></strike>信号源功能（载波频率/幅度，调制频率/幅度）距今已经七年了,检查电流，在没有接射频组件的情况下开机电流小于300mA是正常的，也可以选择万用表来检测。,拆解射频组件1、拆解屏蔽挡板的四颗螺丝后取出屏蔽挡板，如图所示：<strike></strike> 2使用镊子撬开板载的MCX接头，取下四颗屏蔽腔体的四颗螺丝，取出射频组件。,3下图是我们已经取出的射频组件，还是继续拆螺丝。,最终我们的到了这样的射频板。

内容：公版的原理图，改了下MOS管和三极管，运气不错焊好通电USB就能识别了，但MSI001没工作，发现LDO虚焊了，还有那几个射频开关IC确实不太好焊，二层板，收台有些镜像，有时间改个四层板试下。

内容：在是德新一代经济型矢网E5071推出后，8753系列被大量淘汰，并且由于它的YTO内的射频管在工作20年左右后故障率飙升，现在有大量故障机流入二手市场。,8753的锁相环是由源链路，参考路定向耦合器，参考路取样器，参考第一中频和低通滤波器，鉴相器组成的大环路，断开射频输出和参考输入之间的耦合必然导致失锁。,到货后检查发现存在以下几个问题：1、开机数分钟后会跳漏保2、用20dB衰减器连接射频输出和参考输入依然报失锁错误3、电桥上的一个APC-7转3.5mm连接器内导体开花断裂到货后的状态：先解决跳漏保的问题,取出底部的电源板，一眼就看到了膨胀开裂的Y电容：拆下测量，发现两个Y电容的容值都变大了不少，很神奇：换上新的Y电容，装回电源，并检查对地阻值后上电测试，一切正常，漏保也不跳了：接着解决失锁问题，用频谱测量射频输出没有信号,，通过簧片与穿心电容接触：黑色的小点就是YIG小球，粘在一个塑料小棍上，小球外边的小线圈是耦合环：更换YTO前还需确认一下接收链路工作是否正常，矢网设置点频模式，通过依次给参考输入和两个测量输入端注入射频信号

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