at
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
73, David, W1HKJ
Dave, W1HKJ