📄 调频型无线窃听话发射电路.htm
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<TD align=middle>文章来源：<A href="http://www.165v.com/">
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<TD align=middle>文章作者： 老铎 </TD></TR></TBODY></TABLE>
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<P> 调频型无线窃听话发射电路</P>
<P> 该机采用改进型电容三点式振荡器，频率较稳定，在电视无线耳机等保真度要求不是很高的场合很适宜。</P><FONT
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<P> 该电路分为振荡和信号放大部分。Ｌ１、Ｃ２～Ｃ５、Ｖ１等组成与黑白电视机高频头本振电路类似的改进型电容三点式振荡器，频率稳定性好，长时间工作不跑频，实践证明，业余情况下，采用该改进型的电容三点式振荡器完全能胜任。笔者用电烙铁直接烙焊Ｖ１的集电极数秒钟后，在三极管的温度很高的情况下，用普通收音机接收仍很正常，无跑频现象。振荡器的频率主要由Ｌ１和Ｃ２决定，通过微调Ｌ１，可以覆盖８８～１０８ＭＨｚ范围。音频信号经Ｒ６、Ｃ１１耦合至Ｖ１的基极，Ｖ１的ｅ、ｂ极间电容随音频电压的变化而引起振荡频率的变化，实现频率调制。该电路中Ｌ１～Ｌ３用∮０．３１ｍｍ漆包线在∮３．５ｍｍ圆棒上单层平绕。通过调整Ｌ１匝间间距微调振荡频率，再微调Ｌ２、Ｌ３的匝间间距以谐振于振荡频率，获得最大输出功率。 该机采用改进型电容三点式振荡器，频率较稳定，在电视无线耳机等保真度要求不是很高的场合很适宜。
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<TD align=middle>文章作者 </TD>
<TD align=middle>老铎 </TD>
<TD align=middle>文章来源</TD>
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