Why aren;t the times for ALL.TXT taken from the jt9 decode process which has to
get them right since it's got the wav filename to work with?
de Mike W9MDB
On Thursday, February 20, 2020, 05:16:06 PM CST, Bill Somerville
<[email protected]> wrote:
On 20/02/2020 22:01, Martin Davies G0HDB wrote:
I'm running WSJT-X v2.1.2 0068f9 on a PC with Win 7 (Pro).
Back in late January I posted a message, #5852, on [email protected] about a
15-second discrepancy I'd observed between the times of FT8 decodes displayed
in the Band activity window and the times recorded in the ALL.TXT file. The
full path to my message is:
https://groups.io/g/WSJTX/message/5852
Sadly I never received a response to my message so I haven't yet received any
explanation of why the displayed and recorded times of decodes might be
different.
I've recently had reason to spend a bit of time doing some analysis of some
of the decodes recorded in my ALL.TXT file and have come across another oddity.
My latest finding is that my ALL.TXT file shows a list of 'Rx' decodes and a
single 'Tx' entry for my callsign all having the same recorded time; surely
this shouldn't happen because I can't both receive and transmit within a single
15-second period?
Here's an extract from my ALL.TXT file showing what I've described above:
200220_001130 5.357 Rx FT8 -1 0.1 1863 F6EAZ SP2EWQ RR73
200220_001130 5.357 Rx FT8 -15 0.1 2101 CQ KS4OT EM83 200220_001130
5.357 Rx FT8 -7 0.1 2299 CQ A45XR LL93 200220_001145 5.357 Tx FT8
0 0.0 735 WB5XX G0HDB R-19 200220_001200 5.357 Rx
FT8 -19 0.2 612 E77D EA5IVR IM97 200220_001200 5.357 Rx FT8 -11
-0.1 664 CQ DX K4EA EM74 200220_001200 5.357 Rx FT8 -16 0.1 855 AE4WG
FM1HN RR73 200220_001200 5.357 Rx FT8 -12 0.3 1033 OO7B W4JSI R-22
200220_001200 5.357 Rx FT8 -4 0.4 1501 CO8LY IZ5MOQ JN54 200220_001200
5.357 Rx FT8 0 0.1 1863 F6EAZ SP2EWQ RR73 200220_001215 5.357 Rx
FT8 -18 0.1 2100 CQ KS4OT EM83 200220_001215 5.357 Rx FT8 -9 0.2
2299 CQ A45XR LL93 200220_001215 5.357 Tx FT8 0 0.0 735 WB5XX G0HDB
R-16 200220_001230 5.357 Rx FT8 -11 -0.1 664
EA5CMW K4EA -14 200220_001230 5.357 Rx FT8 -15 0.1 854 OZ4VV FM1HN
R-07 200220_001230 5.357 Rx FT8 -14 0.3 1034 OO7B W4JSI 73
200220_001230 5.357 Rx FT8 -4 0.4 1501 CO8LY IZ5MOQ JN54 200220_001245
5.357 Rx FT8 -1 0.1 1863 F6EAZ SP2EWQ RR73
I've added the colouring to highlight my transmissions.
As can be seen, my two transmissions to WB5XX are separated by 30 seconds as
would be expected, but the two 'Rx' entries for KS4OT's and A45XR's CQs
immediately preceding my second transmission at 200220_001215 are shown as
having the same time as my transmission whereas I suspect they should have been
recorded with the time of the preceding 15-second period, ie 200220_0011200,
which would have been the expected 30 seconds after their previous CQ
transmissions.
Also, the final line in the above extract of ALL.TXT, ie. the RR73 message
sent from SP2EWQ to F6EAZ, should presumably have had a recorded time of
200220_001230 and not the time of 200220_001245 that has been written into the
ALL.TXT file.
There are other examples of this inconsistency between the recorded times for
Rx decodes and outgoing transmissions further down in my ALL.TXT file for
earlier today (Thurs 2020-Feb-20); there may be many other similar
discrepancies but I haven't delved any further into my ALL.TXT file.
It seems to me that for some reason the times for some Rx decodes within a
15-second period are being written incorrectly into the ALL.TXT file and are
being recorded as having the time of the following 15-second period, despite
the times shown in the Band activity window potentially being correct (as I'd
reported in January).
I will be grateful if the development team could take a look at this issue,
which is making any 'forensic' analysis I or others might wish or need to do of
the FT8 decodes and transmissions recorded in the ALL.TXT file all but
impossible to do with any sort of accuracy or rigour. The presence of the
discrepancies and inaccuracies in the times recorded in the ALL.TXT file is a
considerable inconvenience and surely shouldn't be happening...!
-- 73, Martin G0HDB
Hi Martin,
I suspect the ALL.TXT rows you are referring to were decoded after the
following period started. The algorithm for allocating to the Rx period is
simplistic and probably unchanged since times when changeover periods were
sufficient to complete all decoding before the end of the period. With FT8 and
probably more so with FT4 on busy bands that is no longer the case.
73
Bill
G4WJS.
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