Re: ELF: Schumann resonance spectrogram

[Markus Vester <markusvester@aol.com>]

Hi Stefan,

no, we normally don't engage noise blanking on ELF, mostly because it would cause splatter around the strong 50 Hz line.

By the way, the observed maxima don't seem to agee well with nominal Schumann frequencies as published in Wikipedia, based on a sqrt(n*(n+1)) formula. A simple set of equispaced frequencies (1.6+n*6.2) Hz appear to provide a better fit. 

Best 73,

Markus

-----Ursprüngliche Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Di, 11. Jun. 2019 12:26
Betreff: ELF: Schumann resonance spectrogram

Hi Markus,

I see you're displaying a 7th Schumann resonance on the DL0AO grabber site.
Edgar pointed me to the idea to enable "show radio station list" in
SpecLab, which is now done. I added just 6 markers, although a 7th trace
is actually visible here as well, with poor SNR though. This leads me to
the question if a noise blanker with high peak/average (blanking only
strong local bursrs) threshold could be useful to improve the Schumann
SNR. Do you have a NB enabled there?

73, Stefan