Message-ID: <4D790CA9.8060500@freenet.de>
Date: Thu, 10 Mar 2011 18:38:49 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <AANLkTiksH2zmPnytPctQT6vd0kDrN-ytOVtg6aTy5Jqh@mail.gmail.com>
In-Reply-To: <AANLkTiksH2zmPnytPctQT6vd0kDrN-ytOVtg6aTy5Jqh@mail.gmail.com>
Subject: Re: LF: DJ8WX weak overnight on 8.970022kHz
Content-Type: multipart/alternative;
 boundary="------------070908020604090001090408"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org


--------------070908020604090001090408
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Hi Roger,

You can speed up the first line in the spectrogram after restart (but 
it's cheating).
By default the program waits until enough samples have been collected to 
calculate a 'complete' FFT. At uHz resolution, this naturally takes ages 
(well, theoretically 1 / freq-resolution).
Here's how to cheat: Select 'options', 'FFT settings', and set the 
checkmark for 'zero-pad if not enough samples available'.
Pro: You can see a bit faster if all works as it should.
Con: Spectrogram will look very blurred initially (as long as the input 
to the FFT is padded).
Details and an explanation is here:
http://www.qsl.net/dl4yhf/speclab/settings.htm#zero_padded_FFT

Hope this helps,
   73,  Wolf .



Am 10.03.2011 09:57, schrieb Roger Lapthorn:
> Once my PC got itself updated and SL running again I was monitoring 
> for DJ8WX in 424uHz BW overnight. There was a weak trace visible, 
> possibly with a gap in the middle of the night (or was this QSB?), but 
> nowhere near as strong as the last time Uwe tested. At best the signal 
> was maybe 4-6dB over noise. The trace attached (LF reflector only) 
> covers the period between about 2300-0730z.
>
> I will continue to monitor until around 1200z but have to close the PC 
> for a couple of days as we will be away.
>
> 73s
> Roger G3XBM
>
> -- 
> g3xbm-qrp.blogspot.com/ <http://g3xbm-qrp.blogspot.com/>
> www.g3xbm.co.uk <http://www.g3xbm.co.uk>
> www.youtube.com/user/g3xbm <http://www.youtube.com/user/g3xbm>
> G3XBM   GQRP 1678    ISWL G11088


--------------070908020604090001090408
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"        http-equiv="Content-Type">
    <title></title>
  </head>
  <body bgcolor="#ffffff" text="#000000">
    Hi Roger,<br>
    <br>
    You can speed up the first line in the spectrogram after restart
    (but it's cheating).<br>
    By default the program waits until enough samples have been
    collected to calculate a 'complete' FFT. At uHz resolution, this
    naturally takes ages (well, theoretically 1 / freq-resolution). <br>
    Here's how to cheat: Select 'options', 'FFT settings', and set the
    checkmark for 'zero-pad if not enough samples available'. <br>
    Pro: You can see a bit faster if all works as it should.<br>
    Con: Spectrogram will look very blurred initially (as long as the
    input to the FFT is padded).<br>
    Details and an explanation is here: <br>
    <a class="moz-txt-link-freetext" href="http://www.qsl.net/dl4yhf/speclab/settings.htm#zero_padded_FFT">http://www.qsl.net/dl4yhf/speclab/settings.htm#zero_padded_FFT</a><br>
    <br>
    Hope this helps,<br>
    &nbsp; 73,&nbsp; Wolf .<br>
    <br>
    <br>
    <br>
    Am 10.03.2011 09:57, schrieb Roger Lapthorn:
    <blockquote        cite="mid:AANLkTiksH2zmPnytPctQT6vd0kDrN-ytOVtg6aTy5Jqh@mail.gmail.com"        type="cite">Once my PC got itself updated and SL running again I
      was monitoring for DJ8WX in 424uHz BW overnight. There was a weak
      trace visible, possibly with a gap in the middle of the night (or
      was this QSB?), but nowhere near as strong as the last time Uwe
      tested. At best the signal was maybe 4-6dB over noise. The trace
      attached (LF reflector only) covers the period between about
      2300-0730z.<br>
      <br>
      I will continue to monitor until around 1200z but have to close
      the PC for a couple of days as we will be away.<br>
      <br>
      73s<br>
      Roger G3XBM<br clear="all">
      <br>
      -- <br>
      <a moz-do-not-send="true" href="http://g3xbm-qrp.blogspot.com/"          target="_blank">g3xbm-qrp.blogspot.com/</a><br>
      <a moz-do-not-send="true" href="http://www.g3xbm.co.uk"          target="_blank">www.g3xbm.co.uk</a><br>
      <a moz-do-not-send="true" href="http://www.youtube.com/user/g3xbm"          target="_blank">www.youtube.com/user/g3xbm</a><br>
      G3XBM&nbsp;&nbsp; GQRP 1678&nbsp;&nbsp;&nbsp; ISWL G11088<br>
    </blockquote>
    <br>
  </body>
</html>

--------------070908020604090001090408--