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Message-ID: <52C4A35F.9000101@iup.uni-heidelberg.de>
Date: Thu, 02 Jan 2014 00:23:11 +0100
From: =?windows-1252?Q?Stefan_Sch=E4fer?=
 <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: 8969.9970Hz
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Hi Uwe,

I was doing some tests with my PA some time ago. Now all EMC problems 
are solved, it works without problems at 320V DC. It looks like this 
test has caused some overloading of the grabber since i was testing at 
8970 Hz. No antenna was connected and it was indoors and in 30m 
distance. Strange...
Now i'm doing a first test with the PA, VOX and OPDS32 on my own grabber 
to see if i can make a decode. Should be finished arround 23:45 UTC and 
displayed at 
http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html , 
like your decode, if it happens. I've reduced the signal, 1 kOhm in 
series to a LOPT transformer and 5m wire in 1m above ground in 30m 
distance. Voltage across the h bridge is 3V :-) The signal is 15 dB in 
my 600 window so your signal should not be affected.

Good luck!

73, Stefan/DK7FC

Am 01.01.2014 22:31, schrieb uwe-jannsen@kabelmail.de:
> Hi Wolf, Stefan, Markus and all,
> i changed at 2223MEZ to Op-4H and leave the PC as it is. no other 
> progr are running.
> do my email stuff etc with an other one.
> GL and Gn
> Uwe/dj8wx

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Hi Uwe, <br>
<br>
I was doing some tests with my PA some time ago. Now all EMC problems
are solved, it works without problems at 320V DC. It looks like this
test has caused some overloading of the grabber since i was testing at
8970 Hz. No antenna was connected and it was indoors and in 30m
distance. Strange...<br>
Now i'm doing a first test with the PA, VOX and OPDS32 on my own
grabber to see if i can make a decode. Should be finished arround 23:45
UTC and displayed at
<a class="moz-txt-link-freetext" href="http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html">http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.html</a> ,
like your decode, if it happens. I've reduced the signal, 1 kOhm in
series to a LOPT transformer and 5m wire in 1m above ground in 30m
distance. Voltage across the h bridge is 3V :-) The signal is 15 dB in
my 600 window so your signal should not be affected.<br>
<br>
Good luck! <br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 01.01.2014 22:31, schrieb <a class="moz-txt-link-abbreviated" href="mailto:uwe-jannsen@kabelmail.de:">uwe-jannsen@kabelmail.de:</a>
<blockquote cite="mid:8cf45405224d4adf889c1c656b332b70@kabelmail.de"
 type="cite">
  <div
 style="margin: 5px; padding: 0pt; font-family: Arial; font-size: 13px;">Hi
Wolf, Stefan, Markus and all,<br>
i changed at 2223MEZ to Op-4H and leave the PC as it is. no other progr
are running.<br>
do my email stuff etc with an other one.<br>
GL and Gn<br>
Uwe/dj8wx<br>
  </div>
</blockquote>
</body>
</html>

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