Hi Stefan, VLF,
the M-Audio E-MU 0202 should work fairly good on USB and it costs around 100
euros. It only needs a PC powerful enough to manage the CPU-consuming USB
interface. This should not represent an issue with modern multi-core
processors.
For my next improvement I choose the older M-Audio Audiophile 2496 PCI
(96KHz max). About 75 euros on the bay. It also exists a version of 2496
with Firewire connection to the PC.
Some more details at following link:
http://www.telepostinc.com/soundcards.html
Regards
Daniele
----- Original Message -----
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
Sent: Saturday, May 29, 2010 3:54 PM
Subject: VLF: VTX India @ 17 kHz
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
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