Message-ID: <59CE384A.2000705@posteo.de>
Date: Fri, 29 Sep 2017 14:10:50 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <59CE342F.4428.4709AE3D@mike.dennison.ntlworld.com>
In-Reply-To: <59CE342F.4428.4709AE3D@mike.dennison.ntlworld.com>
Subject: Re: LF: DK7FC VLF carrier
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Hello Mike,

This is a very good result!

But it is a bit difficult to read the SNR. The relatively high SNR would 
allow you to run a faster spectrogram. What is the current one, maybe 30 
uHz (value of "width of one FFT bin")?. If so, you could try about 60 
uHz and a 2 times faster scroll rate. This will lower the SNR by 3 dB 
but you can see more pixels and see how the signal level fades during 
the night time. You can also run 2 SpecLab instances simultaneously and 
can decide later which of the two spectrograms are more informative...
It appears to me that the QRN is lower during the last few days, which 
also helps us of course.

What was your locator? Something in IO92, right?
There have been a few more requests for another carrier this night, so i 
will just continue to transmit that night. Just follow the grabber...
Due to the lower QRN, Paul may decode the 100 character message after 3 
(or even 2) days already, so i would consider to run a 24 hours or 36 
hours carrier before i actually move to 6.47 kHz with the new coil...

73, Stefan


Am 29.09.2017 13:53, schrieb Mike Dennison:
> Thanks to Stefan for transmitting a carrier overnight. This is very
> useful for those of us who are not quite ready to decode EbNaut
> transmissions but want to optimise our VLF reception.
>
> My screenshot is attached.
>
> Mike, G3XDV
> ==========
>    
>
>
> The following section of this message contains a file attachment
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>       File:  DK7FC_VLF_28-29Sep2017.jpg
>       Date:  29 Sep 2017, 12:44
>       Size:  36265 bytes.
>       Type:  JPEG-image
>    

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Hello Mike, <br>
<br>
This is a very good result! <br>
<br>
But it is a bit difficult to read the SNR. The relatively high SNR
would allow you to run a faster spectrogram. What is the current one,
maybe 30 uHz (value of "width of one FFT bin")?. If so, you could try
about 60 uHz and a 2 times faster scroll rate. This will lower the SNR
by 3 dB but you can see more pixels and see how the signal level fades
during the night time. You can also run 2 SpecLab instances
simultaneously and can decide later which of the two spectrograms are
more informative...<br>
It appears to me that the QRN is lower during the last few days, which
also helps us of course.<br>
<br>
What was your locator? Something in IO92, right?<br>
There have been a few more requests for another carrier this night, so
i will just continue to transmit that night. Just follow the grabber...<br>
Due to the lower QRN, Paul may decode the 100 character message after 3
(or even 2) days already, so i would consider to run a 24 hours or 36
hours carrier before i actually move to 6.47 kHz with the new coil...<br>
<br>
73, Stefan<br>
<br>
<br>
<br>
Am 29.09.2017 13:53, schrieb Mike Dennison:
<blockquote cite="mid:59CE342F.4428.4709AE3D@mike.dennison.ntlworld.com"
 type="cite">
  <pre wrap="">Thanks to Stefan for transmitting a carrier overnight. This is very 
useful for those of us who are not quite ready to decode EbNaut 
transmissions but want to optimise our VLF reception.

My screenshot is attached.

Mike, G3XDV
==========
  </pre>
  <pre wrap="">
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