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fldigi v4.1.20 fldigi v4.1.20 Ham Radio Digital Modem Application Fldigi is a modem program for most of the digital modes used by radio amateurs today: CW, PSK, MFSK, RTTY, Hell, DominoEX, Olivia, and Throb are all supported. It can help calibrate a sound card to a time signal and do frequency measurement tests. Changes: Version 4.1.20 * Update release to both fldigi and flarq Cosmetic changes * Fix cosmetic issues reported by Bob, VK2YQA * Fix parse of macro <PUSH> Gleam scheme * add fltk 'gleam' UI scheme xmlrpc id * add client ID to client requests * add client ID to server parsing cw tracking * adjust tracking filter constants to improve power detection Navtex modem * make single bit flip correction guess a little smarter The flip_smallest_bit code was written with the assumption that the discriminator has equal weights for mark and space, that we are equally likely to get things wrong in each direction, and that flipping the bit with the smallest absolute value is likely to get us what might have been transmitted. However, in the face of selective fading and QRM, the assumption of symmetry proved to be wrong. This is "helped" by the 3/4 framing of SITOR-B, where every character has 3 marks and 4 spaces, resulting in the mark value consistently getting a lower envelope estimation than the ... |
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