A signal appears close to 8819.9 Hz at Forest VA. Doesn't look like Dex, frequency is not stable and not exact multiple of 0.1Hz. http://abelian.org/vlf/tmp/141211a.gif AA5BW perhaps? It would be qui
In a bandwidth more suitable for the width of the signal http://abelian.org/vlf/tmp/141211b.gif I think this is probably Dex running without GPS lock, the frequency offset is about right for the free
And neither is Dex so we have a mystery signal! Tomorrow I'll look back over the 10 day recording loop. Meanwhile the spectrum plot updates every 10 minutes at http://46.4.26.83/sp8820_vlf35.png -- P
Spectrogram covering 24 hours yesterday http://abelian.org/vlf/tmp/141211c.gif A wandering signal from a crystal source of average stability. These are fairly common when you dig deep enough into the
Hmm 8820 Hz is a 60 Hz multiple, so maybe not the best choice for American observers. On the other hand, the trace at Forest seems to be too stable for a direct mains harmonic. What I often see here
Paul, I've been monitoring near 8820 since Dex's prior transmission (assessing and mitigating noise in case Dex switches on again). I don't have good absolute-frequency calibration at this northern V
I've been monitoring near 8820 since Dex's prior transmission (assessing and mitigating noise in case Dex switches on again). Jim, I was testing yesterday afternoon and evening on several frequencies
Hi Jim, resolution (715 uHz bin width), Your resolution is actually similar enough to Paul's 833 uHz bins, and the excursion on the unid signal (around 0.010 Hz, not uHz) would be clearly visible. Co
Hello Jim, you asked: resolution by accessing a data file, or perhaps by opening a new waterfall-display window? Only if you logged the input ("audio") as file, *.wav or *.ogg. From the spectra which
