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From: Eric NO3M <no3m@no3m.net>
Message-ID: <55DA4FD9.8000306@no3m.net>
Date: Sun, 23 Aug 2015 18:57:29 -0400
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Subject: Re: LF: last 12 Hours on 477 OP8
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Stefan

I think the decoder "sensitivity" is still the same, however, the 
two-pass method employs signal subtraction on the second pass, removing 
signals associated with stations decoded in the first pass.  This clears 
the way for stations that may have been missed in the first pass, 
including stations close to a strong station or even stations on the 
same QRG (as shown in my previous post).  On average, I think there are 
10-15% (or more) decodes than with the standard decoder.  It's pretty 
crazy to decode two guys on the same offset that are 12-13 dB different 
in SNR!

The two-pass is the default decoder used in WSJT-X recent SVN code. If 
you run Linux, grab a copy via SVN, compile and try it out! There is a 
nice wsjtx-superbuild script that makes compilation very easy, including 
pulling in the modified Hamlib3 source.  I can post the commands here if 
needed.

73 Eric NO3M / WG2XJM

On 08/23/2015 06:28 PM, DK7FC wrote:
> Hi Eric,
>
> Am 23.08.2015 21:51, schrieb Eric NO3M:
>> [...] WSJT-X (which also now includes WSPR with two-pass, signal 
>> subtraction decoder by K9AN).
> Does this have any advantage i.e. a better decode performance then WSPR-X?
>
>> At any rate... anxious for conditions to settle and start getting 
>> some TA action.
> A good idea!
> I'm on air as well but i do not expect much this time of the year.
>
> 73, Stefan 


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    Stefan<br>
    <br>
    I think the decoder "sensitivity" is still the same, however, the
    two-pass method employs signal subtraction on the second pass,
    removing signals associated with stations decoded in the first
    pass.  This clears the way for stations that may have been missed in
    the first pass, including stations close to a strong station or even
    stations on the same QRG (as shown in my previous post).  On
    average, I think there are 10-15% (or more) decodes than with the
    standard decoder.  It's pretty crazy to decode two guys on the same
    offset that are 12-13 dB different in SNR!<br>
    <br>
    The two-pass is the default decoder used in WSJT-X recent SVN code. 
    If you run Linux, grab a copy via SVN, compile and try it out! 
    There is a nice wsjtx-superbuild script that makes compilation very
    easy, including pulling in the modified Hamlib3 source.  I can post
    the commands here if needed.<br>
    <br>
    73 Eric NO3M / WG2XJM<br>
    <br>
    <div class="moz-cite-prefix">On 08/23/2015 06:28 PM, DK7FC wrote:<br>
    </div>
    <blockquote cite="mid:55DA4905.2080102@posteo.de" type="cite">
      <meta content="text/html; charset=windows-1252"
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      Hi Eric,<br>
      <br>
      Am 23.08.2015 21:51, schrieb Eric NO3M:
      <blockquote cite="mid:55DA2428.2030202@no3m.net" type="cite">
        <meta content="text/html; charset=windows-1252"
          http-equiv="Content-Type">
        [...] WSJT-X (which also now includes WSPR with two-pass, signal
        subtraction decoder by K9AN).<br>
      </blockquote>
      Does this have any advantage i.e. a better decode performance then
      WSPR-X?<br>
      <br>
      <blockquote cite="mid:55DA2428.2030202@no3m.net" type="cite"> At
        any
        rate... anxious for conditions to settle and start getting some
        TA
        action.</blockquote>
      A good idea! <br>
      I'm on air as well but i do not expect much this time of the year.<br>
      <br>
      73, Stefan
    </blockquote>
    <br>
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