Message-ID: <16c806253ea.marcocadeddu@tin.it>
Date: Sun, 11 Aug 2019 13:13:43 +0200 (CEST)
From: "marcocadeddu@tin.it" <marcocadeddu@tin.it>
To:  <rsgb_lf_group@blacksheep.org>
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Subject: R: VLF/ULF: A nice whistler again... | some vlfrx tools stuff
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very nice Stefan :J

thank you


----Messaggio originale----
Da: selberdenken@posteo.de
Data: 11-ago-2019 10.41
A: <rsgb_lf_group@blacksheep.org>
Ogg: VLF/ULF: A nice whistler again... | some vlfrx tools stuff

This morning, while listening the E field from my tree i suddenly heared 
a nice strong whistler again.
I extracted the short section using
vtread -T2019-08-11_06:24,+62 /raw | vtcat -p | vtmix -c0,0,1 | vtfilter 
-a th=4 -h bp,f=2800,w=5000 | vtresample -r12000 -g100 >  
whistler11082019.vt
Since i have access to the database at DL0AO, i produced the same file 
there:
vtread -T2019-08-11_06:24,+62 /raw | vtcat -p | vtmix -c0,0,1 | vtfilter 
-a th=4 -h bp,f=2800,w=5000 | vtresample -r12000 -g100 >  
whistler11082019_0ao.vt
Using scp i transferred the two files over to my notebook. There i 
equalised the audio levels of both recordings using
vtfilter -g8  whistler11082019_0ao.vt > whistler11082019_0ao2.vt
Afterwards, the files were combined using
vtjoin whistler11082019.vt whistler11082019_0ao2.vt whistler11082019_FCAO.vt
and finally a MP3 file was generated using
vtcat -S56 whistler11082019_FCAO.vt | vtraw -ow | lame -b64 - - >  
whistler11082019_FCAO.mp3

Now one can listen to the whistler event (6 seconds, attached) using 
headphones, where the signal of DK7FC is on the left ear and the signal 
of DL0AO is on the right ear.

73, Stefan


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very nice Stefan :J<br><br>thank you<br>
<br>
----Messaggio originale----<br>Da: selberdenken@posteo.de<br>Data: 11-ago-2=
019 10.41<br>A: &lt;rsgb_lf_group@blacksheep.org&gt;<br>Ogg: VLF/ULF: A nic=
e whistler again... | some vlfrx tools stuff<br><br>This morning, while lis=
tening the E field from my tree i suddenly heared <br>a nice strong whistle=
r again.<br>I extracted the short section using<br>vtread -T2019-08-11_06:2=
4,+62 /raw | vtcat -p | vtmix -c0,0,1 | vtfilter <br>-a th=3D4 -h bp,f=3D28=
00,w=3D5000 | vtresample -r12000 -g100 &gt;&nbsp; <br>whistler11082019.vt<b=
r>Since i have access to the database at DL0AO, i produced the same file <b=
r>there:<br>vtread -T2019-08-11_06:24,+62 /raw | vtcat -p | vtmix -c0,0,1 |=
 vtfilter <br>-a th=3D4 -h bp,f=3D2800,w=3D5000 | vtresample -r12000 -g100 =
&gt;&nbsp; <br>whistler11082019_0ao.vt<br>Using scp i transferred the two f=
iles over to my notebook. There i <br>equalised the audio levels of both re=
cordings using<br>vtfilter -g8&nbsp; whistler11082019_0ao.vt &gt; whistler1=
1082019_0ao2.vt<br>Afterwards, the files were combined using<br>vtjoin whis=
tler11082019.vt whistler11082019_0ao2.vt whistler11082019_FCAO.vt<br>and fi=
nally a MP3 file was generated using<br>vtcat -S56 whistler11082019_FCAO.vt=
 | vtraw -ow | lame -b64 - - &gt;&nbsp; <br>whistler11082019_FCAO.mp3<br><b=
r>Now one can listen to the whistler event (6 seconds, attached) using <br>=
headphones, where the signal of DK7FC is on the left ear and the signal <br=
>of DL0AO is on the right ear.<br><br>73, Stefan<br><br><br><br>

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