Hi Martin and all,
Bill has already given you the correct answer. In FT4 and FT8 there are
only about 2 seconds for decoding before the nominal start of the next
sequence. If you are using deep decoding, perhaps with AP, and/or have
a slow computer, some decodes may take place after the sequence boundary.
Entries in the ALL.TXT file are written in the order in which they
occur. Their timestamps are simply rounded down to the most recent
start of a sequence. Thus, late decodes that occur after the sequence
boundary may have an incorrect timestamp -- as you and others have noted.
Of course this could be fixed -- we have known about it for a long time.
So why has it not been fixed? Simply put, because nobody has got around
to it.
ALL.TXT is an undocumented feature in WSJT-X. It's there, first and
foremost, as a very useful tool for us developers. And we have been
busy with other matters we have found more pressing or more interesting.
Most likely, it *will* be fixed in the next release.
-- 73, Joe, K1JT
On 2/21/2020 12:42 AM, Reino Talarmo wrote:
Martin and Bill,
Yes, decoding do continue after the start of next transmission period. I do
see sometimes many decodes after my transmitter has put full power out.
I also do prefer that this issue is corrected as timestamps in ALL.TXT
provide a nice comparison possibility e.g. for reception by two independent
antennas and receivers in a simple measurement arrangement.
73, Reino oh3mA
PS sorry for top response, need to find how to set my email properly.
-----Original Message-----
From: Martin Davies G0HDB [mailto:marting0...@gmail.com]
Sent: 21. helmikuuta 2020 2:16
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Subject: Re: [wsjt-devel] TImes being incorrectly recorded in ALL.TXT
On 20 Feb 2020 at 23:10, Bill Somerville wrote:
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.
Hi Bill, many thanks for that.
I can see that perhaps when there are two consecutive receive periods then
some of the decodes of the signals received in the first period might be
time-stamped with the time of the second period because the decodes were
completed after the start of the second period, but could this happen when
the second period is a transmission period? Is it possible for signals
received in a preceding Rx period to be decoded after the start of a Tx
period, with their timestamp and other details then being written to ALL.TXT
?
--
73, Martin G0HDB
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