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Avery Fineman wrote:
So, if you want to examine the total RF in a time-domain situation, you MUST examine it as amplitude versus an infinitely-thin slice of TIME. You might want to remind everyone that the mathematical Fourier transform of a signal is an integral that extends from time=minus infinity to plus infinity. Since Real Spectrum Analyzers (or network analyzer) need to produce results in something, oh, less than infinite time (probably less than the time between now and the next donut break), they're necessarily limited in the low frequency detail they can provide. True, if Gary's transmitter is transmitting a zero at the moment he connects a spectrum analyzer, he won't see anything at all on the display, but as you point out -- this is an equipment problem, not a mathematical one. I'm still a believer in SSB-FM, BTW. :-) But I have enough respect for you that I won't attempt to argue it further without first finding the time to prepare a few drawings to demonsrate why! ---Joel Kolstad |
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