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Date: Sun, 29 Sep 2013 23:02:20 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: 74550 XRS in Germany
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Funny, i think we can continue with this discussion endlessly :-))
A running gag.

Am 29.09.2013 22:45, schrieb Graham:
> wspr  uses   4 carriers  , so  not suitable

Not suitable for what?

73, Stefan


Am 29.09.2013 22:45, schrieb Graham:
> There is only   'one'  Opera  ! there  is  no  other  single  carrier  
> on/off  data  system
> Yes  , Markus  has  designed  a  secondary detector  that  acts  as  
> a  pattern  recognition  system , for  best  results  , the  qrg  
> needs  to  be  as  stable as  possible  , wspr  uses   4 carriers  , 
> so  not suitable  and  conventional  qrss   has a  limited  number  
> of  transitions
>  Opera  sends  256  bits  in each  tx  cycle  , which  can be  
> detected  earlier  than the  main decoder  , that  is  extracting  the 
>    call  from the  received  data   as opposed  to  pattern  matching  
> , 'a  software  bombe'
> Using  the  long  Op coded tx  signal  , now ,   gives  a  3  way  
> split , the  65 min tx  time  produces  quite a  sizeable  block of  
> data  to  post-process
> 1... Normal   decode  with  Op software ------round  -43 dB
> 2...qrss   grabber  trace  as  line  on qrg...... ??
> 3... correlation detection  .......  -50 dB ??
> With the  advantage  of 50% duty cycle  ..
> 73-G,
>

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Funny, i think we can continue with this discussion endlessly :-))<br>
A running gag.<br>
<br>
Am 29.09.2013 22:45, schrieb Graham:
<blockquote cite="mid:5D7A76C0D1604FC2A0943BC40EA472E4@AGB" type="cite">
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  <div><font face="Arial">wspr&nbsp; uses&nbsp;&nbsp; 4 carriers&nbsp; , so&nbsp; not suitable <br>
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<br>
Not suitable for what?<font face="Arial"><br>
<br>
73, Stefan<br>
<br>
<br>
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Am 29.09.2013 22:45, schrieb Graham:
<blockquote cite="mid:5D7A76C0D1604FC2A0943BC40EA472E4@AGB" type="cite">
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  <div><font face="Arial">There is only&nbsp;&nbsp; 'one'&nbsp; Opera&nbsp; ! there&nbsp; is&nbsp;
no&nbsp; other&nbsp; single&nbsp; carrier&nbsp; on/off&nbsp; data&nbsp; system </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial">Yes&nbsp; , Markus&nbsp; has&nbsp; designed&nbsp; a&nbsp; secondary
detector&nbsp; that&nbsp; acts&nbsp; as&nbsp; a&nbsp; pattern&nbsp; recognition&nbsp; system , for&nbsp; best&nbsp;
results&nbsp; , the&nbsp; qrg&nbsp; needs&nbsp; to&nbsp; be&nbsp; as&nbsp; stable as&nbsp; possible&nbsp; ,&nbsp;wspr&nbsp;
uses&nbsp;&nbsp; 4 carriers&nbsp; , so&nbsp; not suitable&nbsp; and&nbsp; conventional&nbsp; qrss&nbsp;&nbsp; has a&nbsp;
limited&nbsp; number&nbsp; of&nbsp; transitions&nbsp;</font></div>
  <div>&nbsp;</div>
  <div><font face="Arial">&nbsp;Opera&nbsp;&nbsp;sends&nbsp; 256&nbsp; bits&nbsp; in each&nbsp; tx&nbsp; cycle&nbsp;
, which&nbsp; can be&nbsp; detected&nbsp; earlier&nbsp; than the&nbsp; main decoder&nbsp; , that&nbsp; is&nbsp;
extracting&nbsp; the &nbsp; &nbsp;call&nbsp; from the&nbsp; received&nbsp; data&nbsp; &nbsp;as opposed&nbsp; to&nbsp;
pattern&nbsp; matching&nbsp; , 'a&nbsp; software&nbsp; bombe' </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial">Using&nbsp; the&nbsp; long &nbsp;Op coded tx&nbsp; signal&nbsp; , now
,&nbsp;&nbsp; gives&nbsp; a&nbsp; 3&nbsp; way&nbsp; split , the&nbsp; 65 min tx&nbsp; time&nbsp; produces&nbsp; quite a&nbsp;
sizeable&nbsp; block of&nbsp; data&nbsp; to&nbsp; post-process </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial">1... Normal&nbsp;&nbsp; decode&nbsp; with&nbsp; Op
software&nbsp;------round&nbsp; -43 dB&nbsp; </font></div>
  <div><font face="Arial">2...qrss&nbsp;&nbsp; grabber&nbsp; trace&nbsp; as&nbsp; line&nbsp; on
qrg...... ??</font></div>
  <div><font face="Arial">3... correlation detection&nbsp; .......&nbsp; -50 dB
?? </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial">With the&nbsp; advantage&nbsp; of 50% duty cycle&nbsp; .. </font></div>
  <div>&nbsp;</div>
  <div><font face="Arial">73-G,</font></div>
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