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Old October 27th 03, 03:48 AM
Joel Kolstad
 
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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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