Message-ID: <4D19C258.6050903@iup.uni-heidelberg.de>
Date: Tue, 28 Dec 2010 11:56:24 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: VLF snapper
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Hi Laurence,

Thank you for the grabber. It is interesting to have the possibility to 
check the diurnal changes of the lower Alpha trace which gives some 
hints about the best transmission times to your location.

It seems to me the grabber is still running a little fast. What is the 
FFT setting (width of one FFT bin)? I suppose that about 1 mHz and about 
4 minutes per pixel would be the best choice. BTW, do you use a SpecLab 
internal band limiting, noise blanking and clipping? This is essential 
and can improve the signal by 6 dB in most cases!

A nice webpage that has found its place in my favorite list :-)

73, Stefan/DK7FC

Am 28.12.2010 01:02, schrieb Laurence KL7UK:
>
> Ive put on long a snapper for VLF @ http://kl7uk.com/VLFAlaska.html  
> Antennae is a 35T loop beaming N/S over the Pole out in the Birch 
> forest and M0BMU preamp and XSUS sound card - I have some tweaking of 
> the null on the loop to be done but as you can perhaps see RSDN 
> Alpha's is coming thru pretty well. The rx is clocked/locked against 
> Speclab VLF  MSK 200 using NXX on 21.4KHz -
>
> Laurence KL7 UK Wasilla AK

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Hi Laurence, <br>
<br>
Thank you for the grabber. It is interesting to have the possibility to
check the diurnal changes of the lower Alpha trace which gives some
hints about the best transmission times to your location.<br>
<br>
It seems to me the grabber is still running a little fast. What is the
FFT setting (width of one FFT bin)? I suppose that about 1 mHz and
about 4 minutes per pixel would be the best choice. BTW, do you use a
SpecLab internal band limiting, noise blanking and clipping? This is
essential and can improve the signal by 6 dB in most cases!<br>
<br>
A nice webpage that has found its place in my favorite list :-) <br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 28.12.2010 01:02, schrieb Laurence KL7UK:
<blockquote cite="mid:BLU146-W33CEEE60E2D8ED3B762CE0CF010@phx.gbl"   type="cite">
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Ive put on long a snapper for VLF @ <a moz-do-not-send="true"   href="http://kl7uk.com/VLFAlaska.html">http://kl7uk.com/VLFAlaska.html</a>&nbsp;
Antennae is a 35T loop beaming N/S over the Pole out in the Birch
forest and M0BMU preamp and XSUS sound card - I have some tweaking of
the null on the loop to be done but as you can perhaps see RSDN Alpha's
is coming thru pretty well. The rx is clocked/locked against Speclab
VLF&nbsp; MSK 200 using NXX on 21.4KHz - <br>
&nbsp;<br>
Laurence KL7 UK Wasilla AK<br>
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