Message-ID: <4F79EE71.3030304@iup.uni-heidelberg.de>
Date: Mon, 02 Apr 2012 20:22:41 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: LF: 0...36 kHz recording, 4 hours from a quiet location
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Hi Henny, VLF

Thanks for your transmission.
It was a nice day and i took a 4 hour recording during climbing on 
trees, sleeping and eating in a hammok :-)
Right now i'm running various reprocessings and hope to find your signal 
out of the noise. I will post screenshots of the complete session later.

If someone wants to play with the recording wav file, it is available at 
http://dl.dropbox.com/u/19882028/LF/audio/EfieldSteinbruchOhne5k6ExtAkku.WAV 
for a while. It is a 1.95 GB file sampled at 72 k/s.

I switched a 1 MOhm resistor in series to the 5k6 resistor of my active 
receive antenna. The 5k6 resistor should form a high pass with the 10 nF 
capacitor in the circuit 
(http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.jpg) 
By adding the 1 MOhm resistor in series it was clearly seen that the 
lower cut off frequency dropped to < 1 kHz. The highpass was intended to 
reduce mains hum and all the stuff below 4 kHz but there in the forest, 
this is no problem :-)

73, Stefan/DK7FC

PS: On my VLF grabber in the city i see a trace at 8970.002 Hz, maybe 
this was DF6NM transmitting a test signal too?

Am 02.04.2012 10:11, schrieb henny van elst:
> Gm Stefan,lf
> the tx is on,8.970 Khz
> henny cpm
> 73's

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Hi Henny, VLF<br>
<br>
Thanks for your transmission. <br>
It was a nice day and i took a 4 hour recording during climbing on
trees, sleeping and eating in a hammok :-)<br>
Right now i'm running various reprocessings and hope to find your
signal out of the noise. I will post screenshots of the complete
session later.<br>
<br>
If someone wants to play with the recording wav file, it is available
at
<a class="moz-txt-link-freetext" href="http://dl.dropbox.com/u/19882028/LF/audio/EfieldSteinbruchOhne5k6ExtAkku.WAV">http://dl.dropbox.com/u/19882028/LF/audio/EfieldSteinbruchOhne5k6ExtAkku.WAV</a>
for a while. It is a 1.95 GB file sampled at 72 k/s.<br>
<br>
I switched a 1 MOhm resistor in series to the 5k6 resistor of my active
receive antenna. The 5k6 resistor should form a high pass with the 10
nF capacitor in the circuit
(<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.jpg">http://www.iup.uni-heidelberg.de/schaefer_vlf/8,97kHz%20active%20E%20field%20antenna%20by%20DK7FC.jpg</a>)
By adding the 1 MOhm resistor in series it was clearly seen that the
lower cut off frequency dropped to &lt; 1 kHz. The highpass was
intended to reduce mains hum and all the stuff below 4 kHz but there in
the forest, this is no problem :-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
PS: On my VLF grabber in the city i see a trace at 8970.002 Hz, maybe
this was DF6NM transmitting a test signal too?<br>
<br>
Am 02.04.2012 10:11, schrieb henny van elst:
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  <div><font face="Arial" size="2">Gm Stefan,lf</font></div>
  <div><font face="Arial" size="2">the tx is on,8.970 Khz</font></div>
  <div><font face="Arial" size="2">henny cpm</font></div>
  <div><font face="Arial" size="2">73's</font></div>
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