Re: ULF: 140 km crossed on the 101 km band, first results

[DK7FC <selberdenken@posteo.de>]

Hello Vinny,

Yes you can try that. 303.8 km is the record so far. You will need to integrate a long time into one pixel. However i'm not sure if there are propagational effects that makes higher distances harder than expected.

Currently http://no.nonsense.ee/qthmap/ is offline but i found another url offering the same feature: http://k7fry.com/grid/?qth=JN38OO27QJ ...shows the location where i received the signal in 424 uHz. Just to get an impression. It is important to have no civilisation in a radius as wide as possible, that's why i'm always staying in the forest. I like it anyway. I used a large loop with 1 turn and 40m circumference. It was in the middle of the forest which is no problem for that band and for the H field.
Best is to install a recording system in the quiet location and then do other things. I had to go into a museum with the YL but it was quite interesting to my surprise ;-)
I have good experience with the Raspi and the soundcards you already own.

73, Stefan

Am 23.01.2017 17:43, schrieb Vincent Stallbaum:

Hello Stefan,
thank you for the transmissions and congratulations to the good results so far!

I've got a peak, too in 4uHz / 63 hour FFT. But on the wrong QRG :'-(



Maybe I'm able to pick up a further transmission /p in my old Volkswagen "Funkemesswagen" in a quiet place...

73
Vinny




Am 23.01.2017 16:06, schrieb DK7FC:

Hi ULF,

The postprocessing of my recording (0...12 kHz) from France is running. The first pixel of the 424 uHz spectrogram just appeared. It shows a peak on the right frequency having about 20 dB SNR! :-) See attachment.

The ongoing postprocessing can be followed at
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/wide140.jpg
and
http://www.iup.uni-heidelberg.de/schaefer_vlf/VLF/424NMEA.jpg