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Message-ID: <5262EA97.6010908@iup.uni-heidelberg.de>
Date: Sat, 19 Oct 2013 22:24:55 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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In-Reply-To: <9B05FD086F7D43BCB2856D8AD6BF2485@White>
Subject: Re: LF: T/A OPDS
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Hello Markus,

Am 19.10.2013 21:36, schrieb Markus Vester:
> BTW In my other posting I hadn't explained the last dB number in the 
> opds result line. This describes the quality of the match to the 
> callsign template, ie how many dBs the highest peak in the 
> cross-correlation function exceeds its average power, which comes 
> from noise and autocorrelation sidelobes. The range is from about 22 
> dB for a perfect signal, down to a chosen threshold of 15 dB where 
> false positives start to appear occasionally.
OK, understood.

Another question for a better OPDS understanding: Is the decode 
performance of the program also a function of the number of call signs 
in the list? Example: If i go to add any valid amateur radio callsign in 
the list, will decodes (close to the limit) become more unlikely?

73, Stefan/DK7FC

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Hello Markus, <br>
<br>
Am 19.10.2013 21:36, schrieb Markus Vester:
<blockquote cite="mid:9B05FD086F7D43BCB2856D8AD6BF2485@White"
 type="cite">
  <meta http-equiv="Content-Type"
 content="text/html; charset=ISO-8859-1">
  <meta content="MSHTML 6.00.6000.21352" name="GENERATOR">
  <div><font face="Arial" size="2">
  <div><font face="Arial" size="2">BTW In my other posting&nbsp;I hadn't
explained the last dB number in the opds result line.&nbsp;This describes
the quality of the match to the callsign template, ie how many dBs the
highest peak in the cross-correlation&nbsp;function
exceeds&nbsp;its&nbsp;average&nbsp;power, which comes from&nbsp;noise and autocorrelation
sidelobes. The range is&nbsp;from about 22 dB for a perfect signal, down to
a chosen threshold of&nbsp;15 dB where false positives start to appear
occasionally.</font></div>
  </font></div>
</blockquote>
OK, understood.<br>
<br>
Another question for a better OPDS understanding: Is the decode
performance of the program also a function of the number of call signs
in the list? Example: If i go to add any valid amateur radio callsign
in the list, will decodes (close to the limit) become more unlikely?<br>
<br>
73, Stefan/DK7FC<br>
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