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 Home » OlderGeeks.com Freeware Downloads » Toys, Fun Geek Stuff and Other Software » fldigi v4.1.20   
File - Download fldigi v4.1.20
Description

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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 space value, even when both are the exact same signal level!

Make the bit flip guessing a little smarter by correcting towards the
3/4 framing, but only if this character is only one off from a valid
character.

This seems to result in slightly better message decoding in marginal
circumstances.

Smeter Pwr_meter
* correction to xmlrpc procedure to get smeter and power out meter from flrig

My Callsign
* modify edit code to maintain cursor position

Contest fields
* Change to Rx text field parsing
* Change to cut number parsing

gpio ptt
* fix for pi3/4 gpio h/w UDRC-II operation

Add OFDM modes for NBEMS
* OFDM-500F for HF SSB
- survives HF NVIS/long path
- 4-carriers of 62.5-baud 4PSK = 250 bps
- 1/2 rate K=15 FEC with 4sec interleaver
* OFDM-750F for HF SSB
- survives HF NVIS/long path
- 3-carriers of 125-baud 8PSK = 562 bps
- 1/2 rate K=13 FEC with 3.2sec interleaver
* OFDM-2000F for HF-SSB/FM
- 8 carriers of 125-baud 8PSK = 2000bps
- 2/3 rate K=13 FEC with 3.2sec interleaver
* OFDM-2000 for HF-SSB/FM
- 4 carriers of 250-baud 8PSK = 3000bps
- NO FEC, meant for line-of-sight
* OFDM-3500 for FM 9600-port
- 7 carriers of 250-baud 8PSK = 5250bps
- NO FEC, meant for line-of-sight
- Requires Signalink made-after 2018 connected to the 9600-jack
* OFDM-2000F CPU-load fix
- FEC of previous mode too heavy for some CPUs
. Reduced to: K=11 FEC with 1600msec interleaver
. Other mode parameters unchanged
* Added Vestigial-carrier based AFC to OFDM modes
- Increases robustness and tolerance to drift
* OFDM 2000F hold
- commented out OFDM 2000 and 2000F modes for bugfixes
- OFDM 500F, 750F, and 3500 are complete














This download is for the Windows version. All other download assets are below:


MacOS:
fldigi-4.1.20_lion.dmg
fldigi-4.1.20_bs.dmg
fldigi-4.1.20_hs.dmg

Linux:
fldigi-4.1.20.tar.gz

Help:
fldigi-help.pdf
fldigi-help.zip
flarq-help.pdf
flarq-help.zip



Click here to visit the author's website.
Continue below to download this file.


Downloads Views Developer Last Update Version Size Type Rank
3,969 11,463 W1HKJ & Associates <img src="https://www.oldergeeks.com/downloads/gallery/thumbs/fldigi1_th.png"border="0"> Apr 25, 2022 - 12:03 4.1.20 6.29MB EXE 5/5, out of 41 Votes.
File Tags
fldigi  v4.1.20  
      
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