Top screenshot: 'start' of DAX distortion; Middle: 'full' distortion; Bottom: clean signal
- 37 Posts
- 3 Reply Likes
Posted 3 years ago
- 99 Posts
- 13 Reply Likes
- 37 Posts
- 3 Reply Likes
Drax, thanks. Yes, I've also seen these "going silent" instances. For me, it happens a bit less often and on about 1/2 the occasions I get a fix from restarting the DAX (which if done quickly can 'save' the QSO).
Both these problematic conditions (distortion and no keying) indicate that the DAX needs fixing.
73, Rich, K3VAT
- 469 Posts
- 82 Reply Likes
Have tried running DAX as RealTime priority with no help. My computer is 4ghz I7 8 execution units with 16 gigs memory. Usually run my radio 24X7, have to restart DAX now and then.
Tim - W4TME, Customer Experience Manager
- 9153 Posts
- 3497 Reply Likes
If your issue is intermittent, you may need to run LatencyMon for a while until you trap the event.
- 270 Posts
- 48 Reply Likes
- 99 Posts
- 13 Reply Likes
If I can click close and re-open DAX to fix it then why couldn't it be done programmatically? Perhaps Flex doesn't have fine grain enough control over Microsoft's audio driver?
My PC doesn't seem have DPC issues when I'm using it. It seems to happen when I walk away for awhile then perhaps the backup or anti-virus decides to start or the video is powered down automatically. Then I come back to find I have no TX audio.
- 272 Posts
- 20 Reply Likes
I have seen problems similar to this with PowerSDR and my Flex-5000, but not with my Flex-6700 which I have had for almost three years now. This might point to the DPC latency issue that Tim mentioned since PowerSDR does not use DAX.
By the way, I noticed that you are set to USB rather than DIGU, but I doubt if that is related to your problem.
Ed, K0KC
- 37 Posts
- 3 Reply Likes
thanks Ed
Eliminated any DPC latency issue about 1.5 years ago with all new hardware and optimization by Neil.
Yes, I run USB with NO EQ or compression so I can use the 4 kHz bandwidth to cover all of the JT band (usually xxx.076 to xxx.080).
Finally, thanks for the four JT QSOs (160, two on 80, and 40M) !!
73, Rich, K3VAT
Al K0VM, Elmer
- 593 Posts
- 100 Reply Likes
I think you could use DIGU and cover the 4khz for JT I do..
AL, K0VM
- 37 Posts
- 3 Reply Likes
Al, thanks. On my SSDR selections under DIGU are either 3.0 or 5.0 K.
Tim - W4TME, Customer Experience Manager
- 9153 Posts
- 3497 Reply Likes
- 1621 Posts
- 235 Reply Likes
I also save and store the same as favorites in FRStacks which is usually also running.
73, Jay - NO5J
Al K0VM, Elmer
- 593 Posts
- 100 Reply Likes
You can set up DIGU, RX pass band, TX High cut, 14076 and other JT unique things once and then save it to a SSDR memory. Recall to active slice as needed and use WSJT CAT to move to other bands..
AL, K0VM
- 207 Posts
- 23 Reply Likes
I know that I never permit myself to run the "JTs" more than 30 watts myself, even though it "could be" 50. It seems to be just plain hard on the rig with this kind of duty cycle. Stresses all my equipment, not just the Flex.
- 270 Posts
- 48 Reply Likes
- 270 Posts
- 39 Reply Likes
Andrew de VK5CV
Related Categories
-
SmartSDR for Windows
- 4861 Conversations
- 1459 Followers