Hello Rich- I'm sure the WSJT development team would be very interested in having your ".wav" files for analysis. I do not run a browser on the PC that runs my Flex Radio and WSJT. Have a Surface Pro tablet to run the browser apps. With Chrome each tab can use a lot of memory. The fact that the .wav files playback with a low number of decodes means they are defective in some way. The recording process was corrupt. Sending the files to Mike Black might be a good place to start. Finally, if you can not move Chrome to a different computer you may find rebooting daily another way to get around the problem.
Hope this helps. Bill W2PKY On Mon, Apr 19, 2021 at 12:28 PM Rich - K1HTV <[email protected]> wrote: > Bill - W2PKY, > Thanks for the idea of playing back the WAV files which had few or no > decodes. I played the WAV files back and they sound normal, full of > signals but still decode few if any of them when I play them back for > decoding. > > I wonder if WSJT-X has a shared memory buffer which another program had > access to which caused part of the decoding part of the program to produce > the poor decodes. Another thing that I noticed was that when there were FT8 > decodes on the odd cycles, at times most of the decoded signals had a DT of > 0.1 then in some of the next receive cycles almost all decoded stations had > a DT of 0.4 seconds. Then they would be back to 0.1 second DT numbers. > However, when the problem occured, as I checked the PC clock a number of > times using the "time.is" URL, it indicated "Your time is Exact" usually > within 1- milliseconds of exact. > > My station is band switching and decoding 24/7. I've left all normally > used programs running but have shut down Chrome. So far, in the past few > days the problem has not re-occurred. Maybe Chrome is the culprit. The last > time when the problem occured, Chrome was consuming over 1 GB of RAM, still > far less than the available 16GB but still a lot. Once the problem starts, > shutting down Chrome and apps doesn't fix it, only a reboot of the computer. > > Thanks also for the suggestion about checking if standby memory is being > used when the problem occurs. Will have to do that. > > 73, > Rich - K1HTV. > > ---------- Forwarded message ---------- > From: Bill B <[email protected]> > To: WSJT software development <[email protected]> > Cc: > Bcc: > Date: Fri, 16 Apr 2021 21:56:27 -0400 > Subject: Re: [wsjt-devel] > Hello Rich- > Have you listened to the .wav files to see if they sound clean and > undistorted? > > Windows allows audio channels to be monitored. Open sound control panel > > recording tab, locate input device > properties > listen tab > click listen > to this device. > Listen to the audio quality when the app fails to decode everything that’s > in the waterfall. > > Bring up Task Manager > performance > open resource monitor > Memory and > check if Standby memory is used up. That’s when my system starts acting > strange. You may need to reboot more often. > > Hope this helps. > Bill W2PKY > > Sent from my iPad > > On Apr 16, 2021, at 1:47 PM, Mike Lewis <[email protected]> wrote: > > > > I have been seeing cycles with only a few decode counts on busy bands > periodically > > > > I am usually run 2 WJST-X instances 24/7 comparing the decode count each > cycle of a new SDR rig while I am working on it, compared to my K3, both on > the same antenna. I watch the decode count number and waterfall images > constantly, but not the actual decodes much. I do not reboot very often, > the short decode count only happen to me once then back to normal. I blamed > that on the possibility the missing decodes would appear in the next decode > group as late decodes, but I have not verified that happens/happened. Need > to look at that next time. I usually see it a few times a day. I will > look to see if it is odd or even as well. This is 2.4.0-rc4. It occurred > on earlier rc versions, maybe on 2.3 also. > > > > Mike > > K7MDL EL87sm & CN88sf > > > > *From:* Rich - K1HTV <[email protected]> > *Sent:* Friday, April 16, 2021 08:14 > *To:* WSJT <[email protected]> > *Subject:* [wsjt-devel] Few FT8 decodes on Even cycles > > > > In the past couple of months, using both the GA and the RC versions of > WSJT-X, I've been plagued with an intermittent decode problem while running > FT8. I am using Win10 on a dual core i5-2500 @ 3.3GHz with 16GB of RAM. It > may take days and sometimes less for the problem to occur. On a busy 20 > Meter band, the decode count and corresponding number of decodes are > normally between 30 and 60 per 15 second FT8 sequence. > > > > When the problem develops, with a full waterfall display, on the *odd > cycles*, only 4 to 8 signals are decoded and counted. On the *even cycles* > only > a few and often NONE of the many dozen signals are decoded. The DT on most > of the few decoded signals is usually 0.1 seconds, so it's not a clock > issue. > > > > The only fix is to reboot the computer and then the count goes back to the > 30 to 60 decodes on both even and odd 15 second cycles. > > > > When the problem occurs, checking with Task Manager, the max CPU usage on > WSJT-X peaks at less than 5% and the max total CPU usage with other apps is > no more than 20% on peaks. A max of 30% of the 16GB RAM is being used. I > use the Chrome browser, using 300-800MB of RAM. When I shut down Chrome and > all other apps, there doesn't appear to be any phantom occurrences of their > processes running, but the very poor decoding problem still exists. > > > > I turned on WSJT-X "Save all" and played back the saved WAV files and the > number of decodes matched the low counter readings noted for the same > sequences. I switched from using the Elecraft K3 USB CODEC to using the > sound card with audio from the K3 Line Out jack and get the same poor > performance when the problem arises. > > > > As I said, only a reboot of the computer will bring things back to normal. > I'm at a loss to figure out what is causing this intermittent problem and > how to correct it. Does anyone have any ideas of the cause and how it can > be fixed? Thanks. > > > > 73, > > Rich - K1HTV > _______________________________________________ > wsjt-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/wsjt-deve > <https://lists.sourceforge.net/lists/listinfo/wsjt-devel> > > _______________________________________________ > wsjt-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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