Hi Steve and all,
In case you have built WSJT-X v1.7 from r6329 and used it on the HF
bands, you'll surely see many more false decodes than usual. As
committed, the code uses aggressive values for the parameters d_0 and
r_0. These values may be appropriate for EME-like conditions, but
surely not for HF.
On a trial basis, with r6330 I've introduced a table lookup for limits
on nhard, d_0, and r_0, using the user-selectable "Aggressive decoding
level" as the table index.
Here's the table, as implemented in jt65_decode.f90:
Aggr nhard d_0 r_0
-------------------------
0 41 71 0.70
1 42 72 0.72
2 43 73 0.74
3 43 74 0.76
4 44 76 0.78
5 45 77 0.80
6 46 78 0.82
7 47 80 0.84
8 48 81 0.86
9 48 82 0.88
10 49 83 0.90
I changed the early-exit condition in ftrsd2.c to nhard_min <= 41,
ntotal_min <= 71.
Normal operation at HF should set "Aggressive decoding level" to 0.
If you try operating on HF with higher values, be sure to set Ftol=1000.
With higher values of Aggressive decoding level you will see a few
more decodes, and also some false decodes.
Let me know if you have different ideas about how these parameters might
best be set, for different operating conditions.
-- Joe
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