Hi Rex and Charlie,
Thanks for your help in identifying the bug in decoding submode JT4G
with MinW=G. I believe it has been fixed in revision 5690.
-- Joe
On 7/6/2015 10:41 AM, char...@sucklingfamily.free-online.co.uk wrote:
> Hi Joe
>
> Rex is probably in bed now.
>
> You don't need a specific file to demonstrate this bug - simply set MinW
> to G and submode to G.
>
> Here's an example I just did:
>
>
> 2146-125-0.69 599 *
>
> 2146 -8 3.40 801 * DL0SHF 46HID * F
>
> 2146-125-0.69 599 *
>
> line 1 and line 3 with MinW at G, line 2 with MinW at F.
>
> I am sending you directly a decodable mode G off air file in case you
> need one.
>
> Charlie
>
>
>> Hi Rex,
>>
>> Thanks for catching and reporting this bug. I'm not presently at a
>> location where it's convenient to generate test files. Could you send
>> me one or two example files that contain signals with suitable S/N and
>> spread that should be decodable in the "G" submode?
>>
>> -- Joe, K1JT
>>
>> On 7/5/2015 7:03 PM, Rex wrote:
>>>
>>> WSJT X version: r5604
>>>
>>> Operating System: Windows XP
>>>
>>> Symptoms: Does not decode in the "G" bin-width even when decoding
>>> marginal signals with 300 Hz spreading
>>>
>>> Other Symptoms: If you try and force "G" bin-width decodes by setting
>>> MinW to "G" the program gives a faulty output of dB = -125, DT = -0.69
>>> and Freq = 599 even though it has been decoding satisfactorily with the
>>> bin-width set to any lower level than "G".
>>>
>>> Background: This bug was detected when doing simulation tests that
>>> showed that the JT4g performed no better than JT4f even at spreading
>>> wider than the JT4f bin-width (e.g. 200 and 400 Hz.) .
>>>
>>> Test Results: Over 400 tests were undertaken with the WSJT-X simulator
>>> set for marginal decoding at -21.5 dB S/N and spreading of 300 Hz which
>>> should have favoured the "G" bin-width of 315 Hz. Of these tests the
>>> program gained 69% correct syncs, 0.2 % decodes in "C" bin-width, 0.9 %
>>> in "D", 4.9% in "E", 19.5% in "F" and nil in "G". The increasing number
>>> of decodes with bin-width up to "F" is consistent with the bin-width
>>> getting closer to the spreading of 300 Hz up until it gets to the "G"
>>> bin-width which gives nothing.
>>>
>>> WSJT10: WSJT10 has a similar problem and but in this case locks up if
>>> you set MinW to "G".
>>>
>>>
>>> It seems that this bug may simply relate to the variable win-width
>>> routine not do the final step to the "G" bin-width.
>>>
>>>
>>>
>>> 73 Rex VK7MO
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>
>
>
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