Message-ID: <50900CFA.20906@psk31.plus.com>
Date: Tue, 30 Oct 2012 17:23:06 +0000
From: g3zjo <g3zjo@psk31.plus.com>
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To: rsgb_lf_group@blacksheep.org
References: <8D468B5D9DCA4B6D90ED557E68BB66AF@White> <508F157E.9040108@iup.uni-heidelberg.de> <508FAB27.2050909@psk31.plus.com> <508FD677.2050807@iup.uni-heidelberg.de>
In-Reply-To: <508FD677.2050807@iup.uni-heidelberg.de>
Subject: Re: LF: JT9-1 and 2, echoes, waterfall
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Hi Stefan

02r2702 seems to have cured the nasty rattle at COM Port release here.

Non de-code checks done here today on JT9-2, it looks to me that your TX 
/ RX need to be stable over the 2min period to less than +- 0.78Hz, 
pretty critical for rigs.

Eddie G3ZJO

On 30/10/2012 13:30, Stefan Schäfer wrote:
> Hi Eddie, LF,
>
> Am 30.10.2012 11:25, schrieb g3zjo:
>> Hi Stefan
>>
>> I found the lack / loss of decodes annoying, one cause was slight 
>> frequency drift in my transverter, WSPR is not effected but JT9-2 is.
>> I feel there were other periods of unexplained non de-codes too.
>>
>> Was it you who mentioned the burst at the end of the signal. I was 
>> hearing a tuneful diddle at the end of G3XIZ transmission, I hear a 
>> burst of distorted rattle on my own signal.
>>
>> Eddie
>
> No, it was DF6NM who mentioned the burst at the end but i saw it as 
> well. It was part of the end of my signal.
>
> With the new version things became a bit better. The initial crashes 
> didn't happen any more for me. As i assume, this is probably due to 
> the decoder that has to much work to do in a 1 minute period when the 
> range is set to center+-50 Hz and if the CPU power is relatively low 
> or other task have to be performed to the same time. When reducing the 
> range to e.g. +-10 Hz there was no problem on my XP PC (512 MB RAM)  
> (no decodes though). On my Win7 PC (32 bit, 4GB RAM) there were no 
> problems and i got successful decodes.
>
> Probably there have to be some improvements on the decoder. We all 
> confirmed that these problems are not present in WSPR, so Joe may 
> already know what the culprit is.
>
> It's one of the first releases of the software so we obviously have to 
> be patient for some more time.
>
> *On request of DU1GM i will transmit JT9-30, beginning arround 15 UTC 
> on 137.44 kHz (+- a few Hz), full power!*
>
> 73, Stefan/DK7FC
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 2012.0.2221 / Virus Database: 2441/5362 - Release Date: 10/29/12
>


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    Hi Stefan<br>
    <br>
    02r2702 seems to have cured the nasty rattle at COM Port release
    here.<br>
    <br>
    Non de-code checks done here today on JT9-2, it looks to me that
    your TX / RX need to be stable over the 2min period to less than +-
    0.78Hz, pretty critical for rigs.<br>
    <br>
    Eddie G3ZJO<br>
    <br>
    On 30/10/2012 13:30, Stefan Sch&auml;fer wrote:
    <blockquote cite="mid:508FD677.2050807@iup.uni-heidelberg.de"
      type="cite">
      <meta content="text/html; charset=ISO-8859-1"
        http-equiv="Content-Type">
      Hi Eddie, LF,<br>
      <br>
      Am 30.10.2012 11:25, schrieb g3zjo:
      <blockquote cite="mid:508FAB27.2050909@psk31.plus.com" type="cite">
        <meta content="text/html; charset=ISO-8859-1"
          http-equiv="Content-Type">
        Hi Stefan<br>
        <br>
        I found the lack / loss of decodes annoying, one cause was
        slight
        frequency drift in my transverter, WSPR is not effected but
        JT9-2 is.<br>
        I feel there were other periods of unexplained non de-codes too.<br>
        <br>
        Was it you who mentioned the burst at the end of the signal. I
        was
        hearing a tuneful diddle at the end of G3XIZ transmission, I
        hear a
        burst of distorted rattle on my own signal.<br>
        <br>
        Eddie<br>
      </blockquote>
      <br>
      No, it was DF6NM who mentioned the burst at the end but i saw it
      as
      well. It was part of the end of my signal.<br>
      <br>
      With the new version things became a bit better. The initial
      crashes
      didn't happen any more for me. As i assume, this is probably due
      to the
      decoder that has to much work to do in a 1 minute period when the
      range
      is set to center+-50 Hz and if the CPU power is relatively low or
      other
      task have to be performed to the same time. When reducing the
      range to
      e.g. +-10 Hz there was no problem on my XP PC (512 MB RAM)&nbsp; (no
      decodes
      though). On my Win7 PC (32 bit, 4GB RAM) there were no problems
      and i
      got successful decodes.<br>
      <br>
      Probably there have to be some improvements on the decoder. We all
      confirmed that these problems are not present in WSPR, so Joe may
      already know what the culprit is.<br>
      <br>
      It's one of the first releases of the software so we obviously
      have to
      be patient for some more time.<br>
      <br>
      <b>On request of DU1GM i will transmit JT9-30, beginning arround
        15 UTC
        on 137.44 kHz (+- a few Hz), full power!</b><br>
      <br>
      73, Stefan/DK7FC<br>
      <p class="" avgcert""="" color="#000000" align="left">No virus
        found in this message.<br>
        Checked by AVG - <a moz-do-not-send="true"
          href="http://www.avg.com">www.avg.com</a><br>
        Version: 2012.0.2221 / Virus Database: 2441/5362 - Release Date:
        10/29/12</p>
    </blockquote>
    <br>
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