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Date: Sat, 29 May 2010 15:54:32 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: VLF: VTX India @ 17 kHz
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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
>