Bud W2RU asked: What is the usual tilt, if any, in T-storm noise across
160m?
That depends on the time domain response of the lightning discharge. If
we assume a typical pulse (rise time of around 100 microseconds, peak
current of 20,000 amps, and a fall time of around 10 milliseconds) and
transform that into the frequency domain, we'll see the noise amplitude
gradually rising all the way down to a couple hundred KHz and then kind
of leveling off. The difference between the low end of 160m and the high
end of 160m would be only around 1 dB (all of this comes from a
WorldRadio column I wrote in June 1999).
Bud also asked: Is it consistent from storm to storm?
That is a tough question. Maybe someone else has some statistics on the
variation of the time domain response of lightning discharges. I would
think in general that the high end of 160m would normally be exposed to
the lesser T-storm noise - but it doesn't appear to be that much of a
difference. Of course Mother Nature would have the ultimate say here.
Carl K9LA
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