http://www.iup.uni-heidelberg.de/schaefer_vlf/VTX_India.pdf

73, Stefan


Am 29.05.2010 15:54, schrieb Stefan Schäfer:

Hello Peter,

Tnx for your comments again! Yes, there are still some lines that should not have to be where they are ;-) But anyway, it is the best reception i ever had. Now it's time to generate a test signal on the dreamers band ;-)

Also tnx for your last mail. You said i can receive VTX India @17 kHz. This is one transmitter that is very weak but visible anyway. The distance to me is 7795km. Very interesting: Type this in Google Earth: "08.387015, 077.752762" and you can see the towers of the transmitter... So, i spend a VTX window on the bottom of my 2nd grabber. VTX appears up to 25dB above noise in 4,5mHz (equal to the DFCW-600 window). Slowly i get fascinated by the whole VLF band ;-)

Peter (or others), do you know a USB soundcard, that is able to run at 96000 ksamples/s? There are a lot of USB soundcards that cost not even 5 EUR and do a very good job (currently i am using such one) but most of them have a filter for 48000 it seems...

73, Stefan/DK7FC

Am 29.05.2010 08:27, schrieb pws:

Hi Stefan,

You wrote:

...
Thus, the strong LF and MF broadcast signals are well attenuated,
as it seems. I am interested what happens in the night, when QRM goes
down and the LF/MF DX window opens. The grabber2 is still available at
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html

Looking good, congrats! I wonder about that signal visible at 2100 Hz. It

shows a typical MSK-bandwidth and a diurnal run not unlike the others
above. May be it's mirrored from next Nyquist-domain:
24000 + (24000-2100) = 45900 ==>  NSY, Sicily, usually very strong.

Gruesse aus Kiel,
Peter