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On the other hand, VHF wavelengths (e.g. MURS or the Marine radio band) have the potential to communicate longer distances than UHF. VHF waves can still make it through buildings and such,to an extent– but just not as well as UHF(and at a distance penalty in that environment). Howeve...
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VHF/UHF波段的特点完全不同于HF波段,其带宽更宽,适用于调频电台和电视。这个波段大气噪声对接收机的影响较小,由于这些因素,VHF/UHF波段接收机的前置部分的噪声处理将更为重要。另一主要的区别为传播类型,信号的多种传播也意味着爱好者的研究将更加有趣。 然而,并非上述关系使得这些波段如此普及,还有一些其它原因,如...
LF MF HF VHF UHF SHF EHF光波 波长1000m 10m 10cm 1mm1μ 1000Å 频率3kHz 3MHz 3GHz 3000GHz3×1015Hz 图1 在无线电频谱中已经有许多常用的波段。如MF(中频)段包括普通的中波广播、船岸电台或海事无线电服务或其它通信,HF(高频)段依靠电离层的远距离传播,业余无线电爱好者和广播爱好者可以接收到世界...
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I by no means am a digital or analog engineer, How ever I do have a dream of coming up with a simple inexpensive software defined radio kit for new ham radio operators to get high performance and low cost. I believe the development of this would not only ...
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