Dax Sound problem

  • 2
  • Problem
  • Updated 8 months ago
  • Solved
While using WSJT-X or DXLab WinWarbler in a mode other than CW or RTTY. If I leave either application open on the desk top for a while (More than 5 mins) and come back to it to use it. If I try to transmit the radio will key but no sound is made. The only way I have found to fix the problem is to restart the application. This is reproducible.

I have both applications set to use "DAX Audio TX (FlexRadio System" in the sound card settings.

I tried leaving the DAX Control panel open while doing this thinking the TX Streeming botton would be yellow or red but it remains blue.

This has been going on since before the latest SSDR upgrade. I feel it it some sort of Windows thing.

Radio: Flex 6500
Operating Sys: Win10
SSDR: 1.10.8.39

Thanks
73
Kent
NC6B
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Kent Olsen

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Posted 1 year ago

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K6HN

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This is a know issue that is usually blamed to Windows for some "other" application stealing the audio focus. I have never been able to figure out what is actually happening as this can occur on my system with no other applications running. It would be great to find out what is going on and figure out a solution.

Gary
K6HN
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Jay / NO5J

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Kent

By any chance, could it be related to a user/file permission thing, or a 3rd party security software issue. I'm always having to re-enable permissions with my setup. Luckily I usually see a popup/nag/warning when the blockage happens.

 SDRgadgets

73, Jay - NO5J

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Kent Olsen

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Jay

I never see anything pop up, no errors or security warnings so I would have to say that it is not a file permission problem.  Just no sound.

Thanks
Kent
NC6B
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Jay / NO5J

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Kent 

I'll be looking into reproducing the problem. I haven't seen it yet, but I'm going to be looking into Winwarbler in hopes it might be a solution for multi-slice digital app logging. So I might run into the same difficulties.

 SDRgadgets

73, Jay - NO5J

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Kent Olsen

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Jay

WW is a great program. I started using the DXLabs suite about a year ago. The support is great!

I may call FRS tomorrow and see if they have a fix for my problem.

Thanks
Kent
NC6B
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Kevin K4VD, Elroy

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I wonder if another application has taken control of DAX Audio TX. I'm not sure how to check that. At least make sure the Sound/Playback/DAX Audio TX configuration is not set to default (no check). I did a little googling but only found a mention of iTunes grabbing control. That post was pretty old so I'd suspect any oddity has been resolved by now.

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Tim - W4TME, Customer Experience Manager

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A few questions...

Are any of the DAX sound devices be marked by Windows as the default sound device?  If so, this could be causing your issue.

Also, does simply shutting down WSJT and restarting it fix the issue?  If so, then I'd focus my attention on that rather than a DAX issue.

If shutting down WSJT does not fix the issue, but shutting down the DAX control panel and restarting it fixes the issue, then I'd start investigating the possibility that your PC is experiencing some long duration DPC errors that may be causing some buffer corruption issues.  Windows really isn't a good operating system for handling real-time audio and DPCs can exacerbate the problem.
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Tim - W4TME, Customer Experience Manager

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Here is the procedure for removing all of SmartSDR.
https://helpdesk.flexradio.com/hc/en-us/articles/204975589-How-to-do-a-Complete-uninstall-of-SmartSD...

The reassignment of the default playback device is all due to Windows mucking with things when sound devices are disabled or removed. 
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Kent Olsen

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Tim

I have uninstalled and reinstalled SSDR and DAX according to the directions above.

I am optimistic, I have had WinWarbler open for an hour now and it continues to transmit with audio. I will leave the radio on for a few hours and comeback and give it a check. 

Kent
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Kent Olsen

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Tim

Now after a few hours the problem has not happened again.

If it happens again Im going to put a different SSD in my PC and install everything from scratch.

Thanks for sticking with it!!

73
Kent
NC6B
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Mark wt0e

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If it helps, I've had the same issue as the original poster describes but on my 6700 for at least 6 months.  After much tinkering, I found that exiting DAX and restarting instantly solves the issue.  But, I don't know what technically causes the issue.
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Kent Olsen

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Mark

The issue is solved on mine. It was fairly painless. Just completely uninstall SSDR as described above.

Kent

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Kent Olsen

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After taking the above steps the problem is NOT fixed. I still do not have sound after leaving WW or WSJT-X open for a time.

Kent
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Kent Olsen

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Something else.

If I change the soundcard settings in WinWarbler to "DAX RESERVED MIC AUDIO", thinking the audio would then happen it does not. The level now moves on "DAX RESERVED IQ RX 4".

Kent
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Kent Olsen

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Bill

That did not work. No sound was played through the speakers.

Kent
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Bill W2PKY

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Do you have a PC speaker or headphones plugged into the computer and designated as the default device?
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Tim - W4TME, Customer Experience Manager

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NEVER USE THE RESERVED DAX DEVICES.  Theses are the ends of the virtual audio conduit that is connected to DAX.  The other end (not reserved) is connected to your digital mode app.
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Bill W2PKY

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SRI picked the wrong one for the snippet
(Edited)
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Kent Olsen

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Just to give an update on this problem I had. The problem continued on and off, I would uninstall and then reinstall SSDR and that seem to fix the problem for a while, but it would always come back.

I eventually reinstalled Win10 and the problem is gone. It must have been a Windoze problem.

Thanks Tim and all that helped.

73
Kent
NC6B
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KM4CQG

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Reading this old post I am suffering from this now.

After monitoring only every 14 min I loose control of decoding in both PSK31, JT65 ETC

Does the upgrade to V2.0 fix this issue?

Ian
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Tim - W4TME, Customer Experience Manager

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No, it does not.  This problem has been linked to long duration DPCs on the PC running DAX.  If this is your issue, you can try to take mitigating action to resolve the condition.

Here are some relevant HelpDesk articles on the subject.

https://helpdesk.flexradio.com/hc/en-us/articles/202118398-What-are-DPCs-and-why-do-they-matter-

https://helpdesk.flexradio.com/hc/en-us/articles/202118698-Using-LatencyMon-to-collect-DPC-Latency-D...
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Kent Olsen

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Ian

I pulled my hair out for a long time with this. The only way I found to fix the problem was to reinstall Win10. It was fairly painless. I just backed up my personal files but if you go through Win 10 settings then "Update & security then "Recovery" It will keep all of your files in their original locations. When I reinstalled the programs most of my file were still there so it was not that hard to get things going again. It was just time consuming. The problem has not come back since.

Sorry!

Good luck
73 Kent
NC6B
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KM4CQG

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Thanks Kent appreciate the info
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KM4CQG

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Tim

Thanks for those tips and program I was able to track down the problem the past 3 hours all is working well.

Ian
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Tim - W4TME, Customer Experience Manager

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Excellent.  Hunting down DPC culprits can be a challenge.   Congratulations on your initial success.