[OKDXA] Decoding Info

Jeff Martin jeffk5we at gmail.com
Sun Jan 8 06:38:54 EST 2023


This post from Joe Taylor came out on the WSJT developers forum. I 
thought it might be of interest, especially the last paragraph...
73,
Jeff - K5WE
-----------------------
Date: Sat, 7 Jan 2023 16:52:32 -0500
  From: Joe Taylor <joe at princeton.edu>
  To: WSJT software development <wsjt-devel at lists.sourceforge.net>
  Subject: Re: [wsjt-devel] Decodes

When in the NORMAL decode mode and band is busy (35 to 50+) the decode
  indicator flashes 3 times and the last is several seconds (up to 5) 
into
  next time slot. Does this affect the number of decodes in the Band
  Activity window?

  The three flashes you mention occur at roughly these times into the FT8
  receive sequence:

  11.8 s: Attempt to decode many of the stronger signals, even before
  their transmissions are finished.

  13.6 s: Main decoding pass. Subtract signals from all previous decodes
  from the received data stream.  Decode all possible remaining signals.

  15.0 s: Subtract signals from all decodes in Pass 2.  Make a final
  decoding attempt on what's left, with particular attention to signals
  that might be another transmission from a station on that frequency two
  sequences ago.

  In all passes, attention is focused first on your selected Rx audio
  frequency, then on all other frequencies displayed in the waterfall,
  from bottom up.

     -- 73, Joe, K1JT



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