LF: 60 Hz

[DK7FC <73dk7fc@googlemail.com>]

Hi Markus, ELF,

Oh, maybe you're right. The spectrogram is in 45 mHz and 5 s/pix scroll rate. Attached is the recording in 11 mHz and 30 s/pix, see the long-term average graph, red. No noise blanking was used in all spectrograms.
60 Hz, or Lambda= 5000 km. So the distance is just about 1 Lambda! :-) I call it DX :-) What may be the best time for that band on that path?

73, Stefan

Am 26.10.2014 01:32, schrieb Markus Vester:

Hi Stefan,

 

very nice result! Your spectrogram also contains 60 Hz from America, not too conspicuous but easily visible with a little visual averaging.

 

 73, Markus (DF6NM)

-----Ursprüngliche Mitteilung-----
Von: DK7FC <73dk7fc@googlemail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Sa, 25 Okt 2014 9:34 pm
Betreff: Re: LF: Re: Schumann in my garden, final circuit design

Hi ELF friends,

Just for those who are interested...
I have now finished my modifications to the ELF RX / preamp design for a long wire (E field) antenna. This is the final schematic https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FC%20ELF%20RX%20schematic.jpg. Despite the low frequency, it is improtant to use goos shielding in a metallic box. This is how it looks here: https://dl.dropboxusercontent.com/u/19882028/VLF/DK7FC%20ELF%20RX.jpg

I've been in the garden today again and recorded the ELF spectrum (file: https://dl.dropboxusercontent.com/u/19882028/VLF/VLF%20Garten%20in%20T%20Antenne25102014_1st.WAV (584 MB)). Unfortunately ZEVS was off the air during that time but i got SNR of  Schumann resonances again and very low man made noise and design noise. Spectrogram: https://dl.dropboxusercontent.com/u/19882028/VLF/Schumann%20resonances%20on%20final%20design.png

Soon i will do another attempt to trynsmit in the ELF range to detect my signal in 2.4 km distance...

73, Stefan/DK7FC

60 Hz.png
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