Message-ID: <4F351EE3.90108@iup.uni-heidelberg.de>
Date: Fri, 10 Feb 2012 14:42:59 +0100
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: Re: LF: T/A... Continuing VLF WOLF 10 tests
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Hi Jay ;-)

Great! That seems to be the best what we both got so far. Propagation 
must be excellent. 35 dB S/N in 28 mHz, that must be close to audible, 
right? Did you try to listen during watching that spectrogram? :-)
It could be worth to run a CW beacon over night...

In one of the coming nights i want to do a WOLF (10) VLF test again. Now 
i successfully built a class D PA with the LOPT. The exact carrier comes 
from a SpecLab instance, 17940 Hz / 2, i.e. i get a exact 50% duty cycle 
which is essential to drive /this/ class D PA, 2x IRFZ48N, running at 
12V DC supply voltage. The 17940 Hz is feed through a fiber optic link. 
The PSK comes from a separate fiber optic cable and is generated by 
playing a wav file in Winamp, which drives the TX LED from the 
soundcard. So now i can generate the carrier on the VLF grabber PC and 
the PSK on the LF grabber PC ;-)
I expect a new "DX" this weekend...

73, Stefan/DK7FC


Am 10.02.2012 12:20, schrieb jrusgrove@comcast.net:
> Stefan & group
>
> Check out capture at http://www.w1vd.com/grabber.html grabber 1 ... at 
> times 35 dB s/n noise last night! 'Dogbones' are evident as well as 
> some 'spreading' of the signal into nearby bins. This is usually only 
> seen on strong domestic signals.
>
> Jay W1VD  WD2XNS  WE2XR/2
>
>

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Hi Jay ;-)<br>
<br>
Great! That seems to be the best what we both got so far. Propagation
must be excellent. 35 dB S/N in 28 mHz, that must be close to audible,
right? Did you try to listen during watching that spectrogram? :-)<br>
It could be worth to run a CW beacon over night...<br>
<br>
In one of the coming nights i want to do a WOLF (10) VLF test again.
Now i successfully built a class D PA with the LOPT. The exact carrier
comes from a SpecLab instance, 17940 Hz / 2, i.e. i get a exact 50%
duty cycle which is essential to drive <i>this</i> class D PA, 2x
IRFZ48N, running at 12V DC supply voltage. The 17940 Hz is feed through
a fiber optic link. The PSK comes from a separate fiber optic cable and
is generated by playing a wav file in Winamp, which drives the TX LED
from the soundcard. So now i can generate the carrier on the VLF
grabber PC and the PSK on the LF grabber PC ;-)<br>
I expect a new "DX" this weekend...<br>
<br>
73, Stefan/DK7FC<br>
<br>
<br>
Am 10.02.2012 12:20, schrieb <a class="moz-txt-link-abbreviated" href="mailto:jrusgrove@comcast.net:">jrusgrove@comcast.net:</a>
<blockquote cite="mid:00a701cce7e5$fef41d80$8d01a8c0@JAYDELL"
 type="cite">Stefan &amp; group
  <br>
  <br>
Check out capture at <a class="moz-txt-link-freetext" href="http://www.w1vd.com/grabber.html">http://www.w1vd.com/grabber.html</a> grabber 1 ... at
times 35 dB s/n noise last night! 'Dogbones' are evident as well as
some 'spreading' of the signal into nearby bins. This is usually only
seen on strong domestic signals.
  <br>
  <br>
Jay W1VD&nbsp; WD2XNS&nbsp; WE2XR/2
  <br>
  <br>
  <br>
</blockquote>
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