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第19楼bg9hh于2014-09-10 23:20发表的:
声音出来了，信号上来了，原来是静噪在捣鬼

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the squelch circuit uses the voltage of the S-meter,but also includes operation as a noise as a noise squelch for FM
in the SSB CW,and AM modes ,thevoltage of the S-meter is passed into IC12,compared to the voltage level of the squelch variable resistor, andQ54 is controlled by Q52 which is  connected to the output of pin 7.this opens and closes IC13. the analog switch IC, this analog switch switches detection output for the various modes, and sets the switching voltage of all modes to the low level for squelching ,pins 2.3.and 9 on the output side of the analog switch are all fed into the AF pre-amplifier,Q55.in the FM mode, a portion of the output signals is fed into the IC11 filter amplitier, and noise rectified by D102. the noise voltage is inverted and amplified by IC12,and the offset is adjust by R224 so that the level is low when there is no input, and high when there is an iuput signal. the output of
IC12 is passed into the comparator simultaneously with the S-meter output voltage at D101 for noise squelch, this is an S-meter squelch at levels causing large deflections in the S-meter,thus for multi-mode scanning the squelch level can be constantly set to the same value ,the dynamic range of the S-meter for FM is the same as deflection for outher modes

静噪电路采用了S表的电压，而且还包括操作的噪音，噪音静噪调频
在SSB CW和AM模式，thevoltage S表的通入IC12相比，静噪可变电阻，andQ54由Q52的控制，它连接到引脚7，本的输出的电压电平打开和关闭IC13。模拟开关IC，此模拟开关切换为不同的模式的检测输出，并将所有的模式为低电平的静噪的切换电压，销2.3.and9上的模拟开关的输出端都被送入自动对焦前置放大器，Q55.in在FM模式下，输出信号的一部分被供给到IC11滤波器amplitier和噪声纠正由D102。的噪声电压被反转，由IC12放大，并且所述偏移是由R224调整，使得电平为低时，没有输入，并且高时，有一个iuput信号。的输出
IC12传递到比较器与S表的输出电压在D101的噪音静噪同时，这是一个S表静噪，对其造成大挠度S表，从而为多模式扫描静噪等级可以不断水平设定为相同的值时，S-米为调频的动态范围是相同的偏转为outher模式

the squelch circuit uses the voltage of the S-meter,but also includes operation as a noise as a noise squelch for FM
静噪电路的使用电压的仪表，但也包括运行噪声的FM噪声静噪

in the SSB CW,and AM modes ,thevoltage of the S-meter is passed into IC12,compared to the voltage level of the squelch variable resistor, andQ54 is controlled by Q52 which is connected to the output of pin 7.this opens and closes IC13. the analog switch IC, this analog switch switches detection output for the various modes, and sets the switching voltage of all modes to the low level for squelching ,pins 2.3.and 9 on the output side of the analog switch are all fed into the AF pre-amplifier,Q55.in the FM mode, a portion of the output signals is fed into the IC11 filter amplitier, and noise rectified by D102. the noise voltage is inverted and amplified by IC12,and the offset is adjust by R224 so that the level is low when there is no input, and high when there is an iuput signal. the output of
在SSB和CW，AM模式，电压S是通过插入IC121996米，相对于可变电阻器的电压电平静噪控制，是由一个andq54 q52引脚连接到输出打开和关闭ic13 7.this）。集成电路模拟开关模拟开关开关检测输出，这是在不同的模式和电压模式开关集所有的squelching引脚低电平时，2.3.and 9输出侧的开关都是美联储对AF的q55.in预放大器，调频模式，输出信号的一部分美联储的ic11噪声滤波器和放大器，整流（D102）。该噪声电压是倒和法国（IC121996和偏移调整，是由低一级的操作系统，r224当没有输入时，有一个输入和一个高信号。输出）

IC12 is passed into the comparator simultaneously with the S-meter output voltage at D101 for noise squelch, this is an S-meter squelch at levels causing large deflections in the S-meter,thus for multi-mode scanning the squelch level can be constantly set to the same value ,the dynamic range of the S-meter for FM is the same as deflection for outher modes
通过对comparator IC121996是同步的S米输出电压噪声静噪是较好的，这是一个S米静噪水平大致在deflections在S米的多模式扫描，从而在不断设置静噪水平可以到相同的值，在动态范围的S -米FM是一outher模的挠度是相同的