[Ham-Mac] fldigi 4.1.26.14 posted at

[w1hkj]

http://www.w1hkj.com/alpha/fldigi/


      Index of /alpha/fldigi

  * Parent Directory <http://www.w1hkj.com/alpha/>
  * fldigi-4.1.26.14.tar.gz
    <http://www.w1hkj.com/alpha/fldigi/fldigi-4.1.26.14.tar.gz>
  * fldigi-4.1.26.14_VN.dmg
    <http://www.w1hkj.com/alpha/fldigi/fldigi-4.1.26.14_VN.dmg>
  * fldigi-4.1.26.14_setup.exe
    <http://www.w1hkj.com/alpha/fldigi/fldigi-4.1.26.14_setup.exe>
  * fldigi.txt <http://www.w1hkj.com/alpha/fldigi/fldigi.txt>
  * readme.dmg.txt <http://www.w1hkj.com/alpha/fldigi/readme.dmg.txt>
  * readme.txt <http://www.w1hkj.com/alpha/fldigi/readme.txt>

Last two changes:

     navtex

       * fix and simplify timing recovery logic
         . The timing recovery logic was changed to an early / late 
detector a few
         years ago in order to make it less sensitive to null crossings, 
which
         are easily thrown off by the fact that mark and space have 
their own
         low pass filters, and the discriminator calculating the 
envelope for each
         separately.

         . The discriminator output can have mark deviate further from 
zero than
         space, or the other way around, which can shift the null crossings
         around in unpredictable ways.

         . Finding the actual peaks in the discriminator output itself 
appears
         to be a little more predictable. It allows us to get rid of the
         accumulator logic, and expand the loop bandwidth so we can now
         track the example NAVTEX signal from 
https://www.sigidwiki.com/wiki/NAVTEX,
         which runs about .25% fast, which can be seen from a consistent 
adjustment
         of around -2 samples every 8 bit periods.

         . The resulting code can still decode signals from the USGS 
(Honolulu),
         Canada (Moise and Chebogue), and Buenos Aires, all of which are 
much
         lower S/N but closer to the nominal baud rate than the example 
signal.

     TEN_TEN contest field

       * add TEN_TEN field to log.adif file

See fldigi.txt for complete change log.

73, David, W1HKJ