2017-07-23, 19:50
Hi Phil,
"high frequency" is here relative to the frequency range of the lightning signals, and that's up to something like 30 kHz (or 30 kilocycles/sec), not anything like in the MHz range.... Just a bit above audible range. But in the signal plot of your lightning list I can see a quite regular (almost periodic) signal in the E channel and a broad noise in the frequency range above 30 kHz. Since it is always there I think there is some continously running noise source close by, but what is is I can't say. Could be a malfuctioning power supply in your house or one of a street lamp....
The noise signal does not appear in the H channels.
"high frequency" is here relative to the frequency range of the lightning signals, and that's up to something like 30 kHz (or 30 kilocycles/sec), not anything like in the MHz range.... Just a bit above audible range. But in the signal plot of your lightning list I can see a quite regular (almost periodic) signal in the E channel and a broad noise in the frequency range above 30 kHz. Since it is always there I think there is some continously running noise source close by, but what is is I can't say. Could be a malfuctioning power supply in your house or one of a street lamp....
The noise signal does not appear in the H channels.
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