| This is what a digital shortwave broadcast looks like in my free software, SdrDx; the fat red track in the waterfall shows the wide bandwidth of the broadcast very nicely. The green and yellow regions within the wide red track (and the dip in the peak on the spectrum above) represent signal level decreases due to selective fading — fading that occurs on one frequency, but not others — one of the many very interesting things about radio propagation. That fading, by the way, did not result in a loss of signal (I have a wide-bandwidth recording of everything you see here... I can play it back any time I want and re-receive it just as I did the first time.) #swl #sdrdx
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