Igor --
Please feel free to tune the WSJT-X decoders in any way you see fit, and
to use external bandpass filters on the data as you wish.
One of the benefits of open-source code is that you can modify it as you
desire. If you come up with code you believe is superior, I'm sure you
will let us know.
Right now our major focus and priorities lie in other directions.
-- 73, Joe, K1JT
On 1/15/2016 1:39 AM, Игорь Ч wrote:
>
> Hi Joe and All,
> Many thanks to Mikhail R3LW, who pointed me to this issue.
> In order to reproduce it one shall tune FTRSD decoder to maximum sensitivity
> for second pass:
> 1st pass thresh0=2.4
> 2nd pass thresh0=1.0
> _________________________
> Test #1, original audio file brings these JT65 decodes:
> 2227 -15 0.8 1262 # CQ IZ0MIT JN61
> 2227 -21 1.0 1360 # CQ IK2HTY JN45
> 2227 -15 1.3 1626 # ZP9CTS HA3LI JN96
> 2227 -9 0.8 2030 # CQ I1RJP JN45
> 2227 -14 0.9 2128 # JF3SUL SQ5PFF 73
> 2227 -21 1.3 2320 # E9DX YT1DL KN04
> __________________________
> Test #2, 800...1000 Hz band pass filter is applied, now modified audio file
> brings additional decode:
> 0000 -25 0.9 2169 # W4MMP WB9OTX -01
> __________________________
> Test #3, 600...800 Hz band pass filter is applied, now modified audio file
> brings additional decodes:
> 0000 -20 1.6 1962 # KJ3N 9A6CC -20
> 0000 -25 0.9 2169 # W4MMP WB9OTX -01
> __________________________
> Test #4, 5700...6000 Hz band pass filter is applied, now modified audio file
> brings additional decodes:
> 0000 -27 1.1 799 # ER1PB PD2HAB JO22
> 0000 -25 0.9 2169 # W4MMP WB9OTX -01
> All these tests raise question on correctness of the FFT implementation in
> the WSJT-X code.
> For repro I used thresh0 modified r6373, JT65+JT9, Random Erasure Patterns=8.
> Bandpass filter has 30dB rejection outside it's bandwidth.
> I have put audio files there: https://cloud.mail.ru/public/2FYq/iTExXKrnp
> 73 Igor UA3DJY
>
>
>
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