WSJT-X - TX Audio Distortion

fredjrd

Hello​

I’ve come across a strange issue and wanted to see if anyone has run into something similar or has any ideas.

I’m running WSJT-X on three different computers, but two of them are consistently experiencing an odd problem that I haven’t been able to resolve.

Problematic Systems:

ASUS NUC and HP Z2 Mini, both running Windows 11

Intel i7 15th Gen and 14th Gen, 32GB RAM, high-performance SSDs

Radios tested: FlexRadio 8600 and 8600M

The Issue:

When I transmit using FT8 or FT4, I notice:

Distortion and signal jumps during TX

Beeping or noise artifacts heard in the transmit audio

Visible distortion in the waterfall display on both FlexRadio

The exact same radio setup, using the same WSJT-X configuration, works flawlessly on another HP Desktop, which points to the issue being specific to these two machines.

Additional Notes:

I’ve ruled out RFI — I even moved the system to another location miles away, and the issue still occurred.

I’ve double-checked drivers, audio settings, and tried different bands and settings, but no change.

I’m at a bit of a loss — has anyone seen this kind of behavior before or have suggestions on what to try next?

Thanks in advance for any help!

73,
Fred Joly
N5BDJ

Erik Carling EI4KF

Just my opinion, based on experience, but I would suspect the distortion being due to the NUC and Mini having to work hard at background tasks (because of their relatively low spec) whilst also being required to render seamless audio.

A popular answer to this is to check for DPCs and latency, to which end Flex have two useful articles:

What are DPCs and Why Do They Matter? – FlexRadio

Using LatencyMon to collect DPC Latency Data – FlexRadio

My own resolution is to identify and stop all unnecessary background tasks, Windows Services, uninstall Windows Apps that are not required and / or which constantly handshake with Microsoft. In short, pare down the OS and get the number of running tasks at boot up as low as possible.

Windows 11 natively can have 100+ tasks running (as seen in Task Manager / Performance tab) whereas on my W11 system it boots with 76). With my ASUS NUC, it now does not exhibit distortion in FT8 TX.

Erik.

fredjrd

Thanks, Erik. I ran the DPC test and the results are below 1000 — the system isn’t running much in the background. I’m attaching the report below. This is all pretty new to me, so if you see anything concerning or have suggestions on what to tweak to improve things, I’d really appreciate it!


_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: SHACK-Z2-G9
OS version: Windows 11, 10.0, version 2009, build: 26100 (x64)
Hardware: HP Z2 Mini G9 Workstation Desktop PC, HP
BIOS: U50 Ver. 03.03.17
CPU: GenuineIntel Intel(R) Core(TM) i7-14700
Logical processors: 28
Processor groups: 1
Processor group size: 28
RAM: 64793 MB total


_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed (WMI): 210 MHz
Reported CPU speed (registry): 2112 MHz

Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.


_________________________________________________________________________________________________________
MEASURED INTERRUPT TO USER PROCESS LATENCIES
_________________________________________________________________________________________________________
The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

Highest measured interrupt to process latency (µs): 609.20
Average measured interrupt to process latency (µs): 6.238321

Highest measured interrupt to DPC latency (µs): 330.80
Average measured interrupt to DPC latency (µs): 2.267526


_________________________________________________________________________________________________________
REPORTED ISRs
_________________________________________________________________________________________________________
Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

Highest ISR routine execution time (µs): 132.823864
Driver with highest ISR routine execution time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

Highest reported total ISR routine time (%): 0.000008
Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

Total time spent in ISRs (%) 0.000008

ISR count (execution time <250 µs): 191
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-1000 µs): 0
ISR count (execution time 1000-2000 µs): 0
ISR count (execution time 2000-4000 µs): 0
ISR count (execution time >=4000 µs): 0


_________________________________________________________________________________________________________
REPORTED DPCs
_________________________________________________________________________________________________________
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

Highest DPC routine execution time (µs): 1015.847064
Driver with highest DPC routine execution time: ntoskrnl.exe - NT Kernel & System, Microsoft Corporation

Highest reported total DPC routine time (%): 0.005567
Driver with highest DPC total execution time: audiodax.sys - Kernel-mode WDM driver, FlexRadio Systems

Total time spent in DPCs (%) 0.027452

DPC count (execution time <250 µs): 493232
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-10000 µs): 171
DPC count (execution time 1000-2000 µs): 1
DPC count (execution time 2000-4000 µs): 0
DPC count (execution time >=4000 µs): 0


_________________________________________________________________________________________________________
REPORTED HARD PAGEFAULTS
_________________________________________________________________________________________________________
Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

Process with highest pagefault count: backgroundtaskhost.exe

Total number of hard pagefaults 5705
Hard pagefault count of hardest hit process: 3736
Number of processes hit: 11


_________________________________________________________________________________________________________
PER CPU DATA
_________________________________________________________________________________________________________
CPU 0 Interrupt cycle time (s): 29.642116
CPU 0 ISR highest execution time (µs): 36.722538
CPU 0 ISR total execution time (s): 0.000612
CPU 0 ISR count: 124
CPU 0 DPC highest execution time (µs): 405.872159
CPU 0 DPC total execution time (s): 0.667603
CPU 0 DPC count: 236881
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 27.404079
CPU 1 ISR highest execution time (µs): 0.0
CPU 1 ISR total execution time (s): 0.0
CPU 1 ISR count: 0
CPU 1 DPC highest execution time (µs): 197.590436
CPU 1 DPC total execution time (s): 0.003447
CPU 1 DPC count: 353
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 26.484421
CPU 2 ISR highest execution time (µs): 1.960701
CPU 2 ISR total execution time (s): 0.000005
CPU 2 ISR count: 8
CPU 2 DPC highest execution time (µs): 1015.847064
CPU 2 DPC total execution time (s): 0.020863
CPU 2 DPC count: 4531
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 26.530044
CPU 3 ISR highest execution time (µs): 0.0
CPU 3 ISR total execution time (s): 0.0
CPU 3 ISR count: 0
CPU 3 DPC highest execution time (µs): 359.160038
CPU 3 DPC total execution time (s): 0.013963
CPU 3 DPC count: 1183
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 25.246438
CPU 4 ISR highest execution time (µs): 132.823864
CPU 4 ISR total execution time (s): 0.000183
CPU 4 ISR count: 23
CPU 4 DPC highest execution time (µs): 258.614110
CPU 4 DPC total execution time (s): 0.029710
CPU 4 DPC count: 3625
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 26.091940
CPU 5 ISR highest execution time (µs): 0.0
CPU 5 ISR total execution time (s): 0.0
CPU 5 ISR count: 0
CPU 5 DPC highest execution time (µs): 223.036458
CPU 5 DPC total execution time (s): 0.011458
CPU 5 DPC count: 716
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 27.105108
CPU 6 ISR highest execution time (µs): 0.0
CPU 6 ISR total execution time (s): 0.0
CPU 6 ISR count: 0
CPU 6 DPC highest execution time (µs): 223.834754
CPU 6 DPC total execution time (s): 0.009870
CPU 6 DPC count: 1010
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 27.016091
CPU 7 ISR highest execution time (µs): 6.428504
CPU 7 ISR total execution time (s): 0.000010
CPU 7 ISR count: 2
CPU 7 DPC highest execution time (µs): 251.100379
CPU 7 DPC total execution time (s): 0.007749
CPU 7 DPC count: 615
_________________________________________________________________________________________________________
CPU 8 Interrupt cycle time (s): 21.953001
CPU 8 ISR highest execution time (µs): 3.705019
CPU 8 ISR total execution time (s): 0.000004
CPU 8 ISR count: 1
CPU 8 DPC highest execution time (µs): 348.198390
CPU 8 DPC total execution time (s): 1.026441
CPU 8 DPC count: 116179
_________________________________________________________________________________________________________
CPU 9 Interrupt cycle time (s): 24.574604
CPU 9 ISR highest execution time (µs): 0.0
CPU 9 ISR total execution time (s): 0.0
CPU 9 ISR count: 0
CPU 9 DPC highest execution time (µs): 259.200284
CPU 9 DPC total execution time (s): 0.769804
CPU 9 DPC count: 84616
_________________________________________________________________________________________________________
CPU 10 Interrupt cycle time (s): 25.763352
CPU 10 ISR highest execution time (µs): 0.0
CPU 10 ISR total execution time (s): 0.0
CPU 10 ISR count: 0
CPU 10 DPC highest execution time (µs): 245.225852
CPU 10 DPC total execution time (s): 0.232594
CPU 10 DPC count: 25330
_________________________________________________________________________________________________________
CPU 11 Interrupt cycle time (s): 26.138214
CPU 11 ISR highest execution time (µs): 0.0
CPU 11 ISR total execution time (s): 0.0
CPU 11 ISR count: 0
CPU 11 DPC highest execution time (µs): 235.728220
CPU 11 DPC total execution time (s): 0.091077
CPU 11 DPC count: 7596
_________________________________________________________________________________________________________
CPU 12 Interrupt cycle time (s): 26.750362
CPU 12 ISR highest execution time (µs): 0.0
CPU 12 ISR total execution time (s): 0.0
CPU 12 ISR count: 0
CPU 12 DPC highest execution time (µs): 210.730114
CPU 12 DPC total execution time (s): 0.013135
CPU 12 DPC count: 1839
_________________________________________________________________________________________________________
CPU 13 Interrupt cycle time (s): 26.675079
CPU 13 ISR highest execution time (µs): 0.0
CPU 13 ISR total execution time (s): 0.0
CPU 13 ISR count: 0
CPU 13 DPC highest execution time (µs): 215.199811
CPU 13 DPC total execution time (s): 0.004299
CPU 13 DPC count: 298
_________________________________________________________________________________________________________
CPU 14 Interrupt cycle time (s): 26.694684
CPU 14 ISR highest execution time (µs): 0.0
CPU 14 ISR total execution time (s): 0.0
CPU 14 ISR count: 0
CPU 14 DPC highest execution time (µs): 217.247159
CPU 14 DPC total execution time (s): 0.012080
CPU 14 DPC count: 807
_________________________________________________________________________________________________________
CPU 15 Interrupt cycle time (s): 26.619981
CPU 15 ISR highest execution time (µs): 0.0
CPU 15 ISR total execution time (s): 0.0
CPU 15 ISR count: 0
CPU 15 DPC highest execution time (µs): 226.428504
CPU 15 DPC total execution time (s): 0.005533
CPU 15 DPC count: 576
_________________________________________________________________________________________________________
CPU 16 Interrupt cycle time (s): 5.325403
CPU 16 ISR highest execution time (µs): 0.0
CPU 16 ISR total execution time (s): 0.0
CPU 16 ISR count: 0
CPU 16 DPC highest execution time (µs): 326.453125
CPU 16 DPC total execution time (s): 0.084103
CPU 16 DPC count: 3651
_________________________________________________________________________________________________________
CPU 17 Interrupt cycle time (s): 3.122482
CPU 17 ISR highest execution time (µs): 0.0
CPU 17 ISR total execution time (s): 0.0
CPU 17 ISR count: 0
CPU 17 DPC highest execution time (µs): 230.127367
CPU 17 DPC total execution time (s): 0.018705
CPU 17 DPC count: 839
_________________________________________________________________________________________________________
CPU 18 Interrupt cycle time (s): 2.835565
CPU 18 ISR highest execution time (µs): 0.0
CPU 18 ISR total execution time (s): 0.0
CPU 18 ISR count: 0
CPU 18 DPC highest execution time (µs): 220.415720
CPU 18 DPC total execution time (s): 0.008243
CPU 18 DPC count: 522
_________________________________________________________________________________________________________
CPU 19 Interrupt cycle time (s): 2.390266
CPU 19 ISR highest execution time (µs): 0.0
CPU 19 ISR total execution time (s): 0.0
CPU 19 ISR count: 0
CPU 19 DPC highest execution time (µs): 160.063447
CPU 19 DPC total execution time (s): 0.001067
CPU 19 DPC count: 101
_________________________________________________________________________________________________________
CPU 20 Interrupt cycle time (s): 3.299327
CPU 20 ISR highest execution time (µs): 0.0
CPU 20 ISR total execution time (s): 0.0
CPU 20 ISR count: 0
CPU 20 DPC highest execution time (µs): 280.939394
CPU 20 DPC total execution time (s): 0.007487
CPU 20 DPC count: 336
_________________________________________________________________________________________________________
CPU 21 Interrupt cycle time (s): 2.585448
CPU 21 ISR highest execution time (µs): 0.0
CPU 21 ISR total execution time (s): 0.0
CPU 21 ISR count: 0
CPU 21 DPC highest execution time (µs): 52.553030
CPU 21 DPC total execution time (s): 0.000408
CPU 21 DPC count: 28
_________________________________________________________________________________________________________
CPU 22 Interrupt cycle time (s): 2.478355
CPU 22 ISR highest execution time (µs): 0.0
CPU 22 ISR total execution time (s): 0.0
CPU 22 ISR count: 0
CPU 22 DPC highest execution time (µs): 47.230114
CPU 22 DPC total execution time (s): 0.000866
CPU 22 DPC count: 80
_________________________________________________________________________________________________________
CPU 23 Interrupt cycle time (s): 2.299482
CPU 23 ISR highest execution time (µs): 0.0
CPU 23 ISR total execution time (s): 0.0
CPU 23 ISR count: 0
CPU 23 DPC highest execution time (µs): 273.657197
CPU 23 DPC total execution time (s): 0.022998
CPU 23 DPC count: 1178
_________________________________________________________________________________________________________
CPU 24 Interrupt cycle time (s): 3.748487
CPU 24 ISR highest execution time (µs): 3.498580
CPU 24 ISR total execution time (s): 0.000054
CPU 24 ISR count: 33
CPU 24 DPC highest execution time (µs): 130.792614
CPU 24 DPC total execution time (s): 0.002725
CPU 24 DPC count: 186
_________________________________________________________________________________________________________
CPU 25 Interrupt cycle time (s): 3.144074
CPU 25 ISR highest execution time (µs): 0.0
CPU 25 ISR total execution time (s): 0.0
CPU 25 ISR count: 0
CPU 25 DPC highest execution time (µs): 176.917614
CPU 25 DPC total execution time (s): 0.001478
CPU 25 DPC count: 98
_________________________________________________________________________________________________________
CPU 26 Interrupt cycle time (s): 2.762967
CPU 26 ISR highest execution time (µs): 0.0
CPU 26 ISR total execution time (s): 0.0
CPU 26 ISR count: 0
CPU 26 DPC highest execution time (µs): 111.421875
CPU 26 DPC total execution time (s): 0.000860
CPU 26 DPC count: 160
_________________________________________________________________________________________________________
CPU 27 Interrupt cycle time (s): 2.427138
CPU 27 ISR highest execution time (µs): 0.0
CPU 27 ISR total execution time (s): 0.0
CPU 27 ISR count: 0
CPU 27 DPC highest execution time (µs): 68.857955
CPU 27 DPC total execution time (s): 0.000786
CPU 27 DPC count: 70
_________________________________________________________________________________________________________

Erik Carling EI4KF

Wdf01000.sys is a well known culprit that can cause audio issues. Which is not to say it is the (sole) reason here. More likely it is an over bloated OS. However, you can tackle it to see if afterwards in a rerun of the DPC test that it disappears.

1. In Device Manager / System Devices, set High precision event timer to disabled
2. In Device Manager / Network adapters, select the one you use and deploy the changes in its Properties that are outlined in Tim Ellison's article "Optimizing Ethernet Adapter Settings for Maximum Performance" at https://helpdesk.flexradio.com/hc/en-us/articles/202118518-Optimizing-Ethernet-Adapter-Settings-for-Maximum-Performance
3. Check the Windows 11 Power Plan is set for Maximum Performance
4. In Windows Settings / Gaming / Game Mode, set this to on (which also helps stop background activity in addition to the paring advice I gave)
5. Update all drivers in the OS
6. Open a Help Desk ticket if all else fails since the issue involves DAX. Much more knowledgeable people than myself, such as Tim and Mike, may provide a solution.

Erik

fredjrd

Thanks Erik, I will open a case now since I did all of that and still have the issue. Here is the new results.
Also I just open a Helpdesk ticket.

_________________________________________________________________________________________________________
CONCLUSION
_________________________________________________________________________________________________________
Your system seems to be having difficulty handling real-time audio and other tasks. You may experience drop outs, clicks or pops due to buffer underruns. One or more DPC routines that belong to a driver running in your system appear to be executing for too long. One problem may be related to power management, disable CPU throttling settings in Control Panel and BIOS setup. Check for BIOS updates.
LatencyMon has been analyzing your system for 0:11:03 (h:mm:ss) on all processors.


_________________________________________________________________________________________________________
SYSTEM INFORMATION
_________________________________________________________________________________________________________
Computer name: SHACK-Z2-G9
OS version: Windows 11, 10.0, version 2009, build: 26100 (x64)
Hardware: HP Z2 Mini G9 Workstation Desktop PC, HP
BIOS: U50 Ver. 03.03.17
CPU: GenuineIntel Intel(R) Core(TM) i7-14700
Logical processors: 28
Processor groups: 1
Processor group size: 28
RAM: 64793 MB total


_________________________________________________________________________________________________________
CPU SPEED
_________________________________________________________________________________________________________
Reported CPU speed (WMI): 210 MHz
Reported CPU speed (registry): 2112 MHz

Note: reported execution times may be calculated based on a fixed reported CPU speed. Disable variable speed settings like Intel Speed Step and AMD Cool N Quiet in the BIOS setup for more accurate results.


_________________________________________________________________________________________________________
MEASURED INTERRUPT TO USER PROCESS LATENCIES
_________________________________________________________________________________________________________
The interrupt to process latency reflects the measured interval that a usermode process needed to respond to a hardware request from the moment the interrupt service routine started execution. This includes the scheduling and execution of a DPC routine, the signaling of an event and the waking up of a usermode thread from an idle wait state in response to that event.

Highest measured interrupt to process latency (µs): 438.70
Average measured interrupt to process latency (µs): 7.069557

Highest measured interrupt to DPC latency (µs): 326.90
Average measured interrupt to DPC latency (µs): 2.669988


_________________________________________________________________________________________________________
REPORTED ISRs
_________________________________________________________________________________________________________
Interrupt service routines are routines installed by the OS and device drivers that execute in response to a hardware interrupt signal.

Highest ISR routine execution time (µs): 131.761837
Driver with highest ISR routine execution time: HDAudBus.sys - High Definition Audio Bus Driver, Microsoft Corporation

Highest reported total ISR routine time (%): 0.000019
Driver with highest ISR total time: Wdf01000.sys - Kernel Mode Driver Framework Runtime, Microsoft Corporation

Total time spent in ISRs (%) 0.000023

ISR count (execution time <250 µs): 268
ISR count (execution time 250-500 µs): 0
ISR count (execution time 500-1000 µs): 0
ISR count (execution time 1000-2000 µs): 0
ISR count (execution time 2000-4000 µs): 0
ISR count (execution time >=4000 µs): 0


_________________________________________________________________________________________________________
REPORTED DPCs
_________________________________________________________________________________________________________
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

Highest DPC routine execution time (µs): 1038.680398
Driver with highest DPC routine execution time: ntoskrnl.exe - NT Kernel & System, Microsoft Corporation

Highest reported total DPC routine time (%): 0.006446
Driver with highest DPC total execution time: ntoskrnl.exe - NT Kernel & System, Microsoft Corporation

Total time spent in DPCs (%) 0.030181

DPC count (execution time <250 µs): 670914
DPC count (execution time 250-500 µs): 0
DPC count (execution time 500-10000 µs): 168
DPC count (execution time 1000-2000 µs): 4
DPC count (execution time 2000-4000 µs): 0
DPC count (execution time >=4000 µs): 0


_________________________________________________________________________________________________________
REPORTED HARD PAGEFAULTS
_________________________________________________________________________________________________________
Hard pagefaults are events that get triggered by making use of virtual memory that is not resident in RAM but backed by a memory mapped file on disk. The process of resolving the hard pagefault requires reading in the memory from disk while the process is interrupted and blocked from execution.

NOTE: some processes were hit by hard pagefaults. If these were programs producing audio, they are likely to interrupt the audio stream resulting in dropouts, clicks and pops. Check the Processes tab to see which programs were hit.

Process with highest pagefault count: smartsdr.exe

Total number of hard pagefaults 3329
Hard pagefault count of hardest hit process: 1087
Number of processes hit: 43


_________________________________________________________________________________________________________
PER CPU DATA
_________________________________________________________________________________________________________
CPU 0 Interrupt cycle time (s): 57.590010
CPU 0 ISR highest execution time (µs): 42.396780
CPU 0 ISR total execution time (s): 0.002233
CPU 0 ISR count: 159
CPU 0 DPC highest execution time (µs): 1038.680398
CPU 0 DPC total execution time (s): 0.7410
CPU 0 DPC count: 265118
_________________________________________________________________________________________________________
CPU 1 Interrupt cycle time (s): 53.232563
CPU 1 ISR highest execution time (µs): 0.0
CPU 1 ISR total execution time (s): 0.0
CPU 1 ISR count: 0
CPU 1 DPC highest execution time (µs): 1035.769886
CPU 1 DPC total execution time (s): 0.014284
CPU 1 DPC count: 1443
_________________________________________________________________________________________________________
CPU 2 Interrupt cycle time (s): 52.011237
CPU 2 ISR highest execution time (µs): 0.0
CPU 2 ISR total execution time (s): 0.0
CPU 2 ISR count: 0
CPU 2 DPC highest execution time (µs): 256.103220
CPU 2 DPC total execution time (s): 0.071984
CPU 2 DPC count: 4811
_________________________________________________________________________________________________________
CPU 3 Interrupt cycle time (s): 52.231444
CPU 3 ISR highest execution time (µs): 37.600379
CPU 3 ISR total execution time (s): 0.000993
CPU 3 ISR count: 42
CPU 3 DPC highest execution time (µs): 318.731534
CPU 3 DPC total execution time (s): 0.043292
CPU 3 DPC count: 3771
_________________________________________________________________________________________________________
CPU 4 Interrupt cycle time (s): 51.232858
CPU 4 ISR highest execution time (µs): 41.850852
CPU 4 ISR total execution time (s): 0.000272
CPU 4 ISR count: 12
CPU 4 DPC highest execution time (µs): 267.104640
CPU 4 DPC total execution time (s): 0.069936
CPU 4 DPC count: 4919
_________________________________________________________________________________________________________
CPU 5 Interrupt cycle time (s): 51.708186
CPU 5 ISR highest execution time (µs): 0.0
CPU 5 ISR total execution time (s): 0.0
CPU 5 ISR count: 0
CPU 5 DPC highest execution time (µs): 254.306818
CPU 5 DPC total execution time (s): 0.032773
CPU 5 DPC count: 2202
_________________________________________________________________________________________________________
CPU 6 Interrupt cycle time (s): 51.489825
CPU 6 ISR highest execution time (µs): 131.761837
CPU 6 ISR total execution time (s): 0.000790
CPU 6 ISR count: 35
CPU 6 DPC highest execution time (µs): 275.785985
CPU 6 DPC total execution time (s): 0.047005
CPU 6 DPC count: 3232
_________________________________________________________________________________________________________
CPU 7 Interrupt cycle time (s): 51.548264
CPU 7 ISR highest execution time (µs): 0.0
CPU 7 ISR total execution time (s): 0.0
CPU 7 ISR count: 0
CPU 7 DPC highest execution time (µs): 302.717803
CPU 7 DPC total execution time (s): 0.050068
CPU 7 DPC count: 3270
_________________________________________________________________________________________________________
CPU 8 Interrupt cycle time (s): 45.051708
CPU 8 ISR highest execution time (µs): 6.429451
CPU 8 ISR total execution time (s): 0.000006
CPU 8 ISR count: 1
CPU 8 DPC highest execution time (µs): 1032.266572
CPU 8 DPC total execution time (s): 1.342917
CPU 8 DPC count: 122111
_________________________________________________________________________________________________________
CPU 9 Interrupt cycle time (s): 45.057940
CPU 9 ISR highest execution time (µs): 0.0
CPU 9 ISR total execution time (s): 0.0
CPU 9 ISR count: 0
CPU 9 DPC highest execution time (µs): 343.099905
CPU 9 DPC total execution time (s): 1.467910
CPU 9 DPC count: 124948
_________________________________________________________________________________________________________
CPU 10 Interrupt cycle time (s): 48.044413
CPU 10 ISR highest execution time (µs): 0.0
CPU 10 ISR total execution time (s): 0.0
CPU 10 ISR count: 0
CPU 10 DPC highest execution time (µs): 384.005682
CPU 10 DPC total execution time (s): 0.766968
CPU 10 DPC count: 66055
_________________________________________________________________________________________________________
CPU 11 Interrupt cycle time (s): 48.585575
CPU 11 ISR highest execution time (µs): 6.510417
CPU 11 ISR total execution time (s): 0.000036
CPU 11 ISR count: 17
CPU 11 DPC highest execution time (µs): 1032.659091
CPU 11 DPC total execution time (s): 0.656423
CPU 11 DPC count: 51884
_________________________________________________________________________________________________________
CPU 12 Interrupt cycle time (s): 51.835926
CPU 12 ISR highest execution time (µs): 0.0
CPU 12 ISR total execution time (s): 0.0
CPU 12 ISR count: 0
CPU 12 DPC highest execution time (µs): 318.135417
CPU 12 DPC total execution time (s): 0.036358
CPU 12 DPC count: 2487
_________________________________________________________________________________________________________
CPU 13 Interrupt cycle time (s): 51.687508
CPU 13 ISR highest execution time (µs): 0.0
CPU 13 ISR total execution time (s): 0.0
CPU 13 ISR count: 0
CPU 13 DPC highest execution time (µs): 229.813920
CPU 13 DPC total execution time (s): 0.034199
CPU 13 DPC count: 2211
_________________________________________________________________________________________________________
CPU 14 Interrupt cycle time (s): 51.870675
CPU 14 ISR highest execution time (µs): 0.0
CPU 14 ISR total execution time (s): 0.0
CPU 14 ISR count: 0
CPU 14 DPC highest execution time (µs): 319.473485
CPU 14 DPC total execution time (s): 0.051310
CPU 14 DPC count: 3177
_________________________________________________________________________________________________________
CPU 15 Interrupt cycle time (s): 51.753859
CPU 15 ISR highest execution time (µs): 0.0
CPU 15 ISR total execution time (s): 0.0
CPU 15 ISR count: 0
CPU 15 DPC highest execution time (µs): 256.327178
CPU 15 DPC total execution time (s): 0.019828
CPU 15 DPC count: 1430
_________________________________________________________________________________________________________
CPU 16 Interrupt cycle time (s): 16.641821
CPU 16 ISR highest execution time (µs): 0.0
CPU 16 ISR total execution time (s): 0.0
CPU 16 ISR count: 0
CPU 16 DPC highest execution time (µs): 837.071023
CPU 16 DPC total execution time (s): 0.110538
CPU 16 DPC count: 4975
_________________________________________________________________________________________________________
CPU 17 Interrupt cycle time (s): 8.176378
CPU 17 ISR highest execution time (µs): 0.0
CPU 17 ISR total execution time (s): 0.0
CPU 17 ISR count: 0
CPU 17 DPC highest execution time (µs): 290.442708
CPU 17 DPC total execution time (s): 0.012591
CPU 17 DPC count: 739
_________________________________________________________________________________________________________
CPU 18 Interrupt cycle time (s): 7.270138
CPU 18 ISR highest execution time (µs): 0.0
CPU 18 ISR total execution time (s): 0.0
CPU 18 ISR count: 0
CPU 18 DPC highest execution time (µs): 235.159091
CPU 18 DPC total execution time (s): 0.008201
CPU 18 DPC count: 401
_________________________________________________________________________________________________________
CPU 19 Interrupt cycle time (s): 6.211349
CPU 19 ISR highest execution time (µs): 0.0
CPU 19 ISR total execution time (s): 0.0
CPU 19 ISR count: 0
CPU 19 DPC highest execution time (µs): 66.354167
CPU 19 DPC total execution time (s): 0.000723
CPU 19 DPC count: 77
_________________________________________________________________________________________________________
CPU 20 Interrupt cycle time (s): 8.956919
CPU 20 ISR highest execution time (µs): 0.0
CPU 20 ISR total execution time (s): 0.0
CPU 20 ISR count: 0
CPU 20 DPC highest execution time (µs): 288.816288
CPU 20 DPC total execution time (s): 0.015311
CPU 20 DPC count: 1051
_________________________________________________________________________________________________________
CPU 21 Interrupt cycle time (s): 5.474041
CPU 21 ISR highest execution time (µs): 0.0
CPU 21 ISR total execution time (s): 0.0
CPU 21 ISR count: 0
CPU 21 DPC highest execution time (µs): 172.244792
CPU 21 DPC total execution time (s): 0.001201
CPU 21 DPC count: 84
_________________________________________________________________________________________________________
CPU 22 Interrupt cycle time (s): 5.066019
CPU 22 ISR highest execution time (µs): 0.0
CPU 22 ISR total execution time (s): 0.0
CPU 22 ISR count: 0
CPU 22 DPC highest execution time (µs): 79.874527
CPU 22 DPC total execution time (s): 0.001255
CPU 22 DPC count: 81
_________________________________________________________________________________________________________
CPU 23 Interrupt cycle time (s): 4.434986
CPU 23 ISR highest execution time (µs): 0.0
CPU 23 ISR total execution time (s): 0.0
CPU 23 ISR count: 0
CPU 23 DPC highest execution time (µs): 66.285511
CPU 23 DPC total execution time (s): 0.001234
CPU 23 DPC count: 80
_________________________________________________________________________________________________________
CPU 24 Interrupt cycle time (s): 15.422893
CPU 24 ISR highest execution time (µs): 3.316761
CPU 24 ISR total execution time (s): 0.000004
CPU 24 ISR count: 2
CPU 24 DPC highest execution time (µs): 60.146307
CPU 24 DPC total execution time (s): 0.003328
CPU 24 DPC count: 224
_________________________________________________________________________________________________________
CPU 25 Interrupt cycle time (s): 6.634104
CPU 25 ISR highest execution time (µs): 0.0
CPU 25 ISR total execution time (s): 0.0
CPU 25 ISR count: 0
CPU 25 DPC highest execution time (µs): 56.440814
CPU 25 DPC total execution time (s): 0.000715
CPU 25 DPC count: 91
_________________________________________________________________________________________________________
CPU 26 Interrupt cycle time (s): 6.238112
CPU 26 ISR highest execution time (µs): 0.0
CPU 26 ISR total execution time (s): 0.0
CPU 26 ISR count: 0
CPU 26 DPC highest execution time (µs): 80.467803
CPU 26 DPC total execution time (s): 0.002194
CPU 26 DPC count: 121
_________________________________________________________________________________________________________
CPU 27 Interrupt cycle time (s): 5.606281
CPU 27 ISR highest execution time (µs): 0.0
CPU 27 ISR total execution time (s): 0.0
CPU 27 ISR count: 0
CPU 27 DPC highest execution time (µs): 107.810606
CPU 27 DPC total execution time (s): 0.001136
CPU 27 DPC count: 93
_________________________________________________________________________________________________________

bahillen

I am having the same problem and the computers are fast. It was not seen months ago but is now a problem I can’t find or solve. One computer AMD AM5 9 7900x and the other is a Dell 7 7700. The Dell is fine and not ever seen the issue. The AMD was good for a long time but now a problem for last few months. Both computers have same latest versions of software for all apps. I have the problem with only WSJT-x and SmartSDR running. Only on 1 band, one decoder. The problem also there with JTDX.

I have run LatencyMon and is good. Never erroring out and less than 100us. All bars on the left side LatencyMon pane.

In FT8 there are POPs in TX as seen on the monitor audio and waterfall. The pops in the waterfall display are wide in the tx audio bandwidth. It may pop 5 or 10 times in a transmit cycle. Not seen in audio decode. The station is having some problems decoding me and usually complete Q in a few try’s.

In SmartSDR Test button there a no pops. In test using WSJT-X there are pops. Even at 5 watts or less and no amp.

As a test I reduced th TX band with to 1200 low and 1800 high with tx at 1500 hz and as expected the waterfall pops got narrower around the TX 1500 hz.

I have setup DAX my second good computer using DAX from to the bad computer. DAX running on both computers with configured to the bad computer. The TX audio is clean.

It seems to me that there is a problem in the computer TX audio path on the computer or the DAX on that computer that is allowing conflicts in the audio signal. It is running the latest update to Windows 11. I don’t recall exactly but it’s like 2H24.

If anyone has resolved this issue or has test suggestions it would be helpful.

I will fill out a help desk ticket next week when I can be home.

73

Bill

W9JJB

John KB4DU

Are you using a switch/router or is there a direct Ethernet connection to the radio?

fredjrd

Hi Bill, Yes same problem here and I can't pin point to what is the problem.

@"John KB4DU" I use a Switch, before I have a switch connect to another to expand ports but the Z2 Mini and the Flex are on the same switch now and still have the problem. I'm running next a Wireshark to make sure no communication issue between radio and computer.

fredjrd

Hello, just to update everyone. After a full day of troubleshooting, I was finally able to track down the issue—it turned out to be network-related.

Using the DPC article from the Flex Community and LatencyMon, I discovered that a faulty network cable was causing my computer’s network card to generate CRC errors. Once I replaced the cable, everything started working perfectly.

Appreciate the resources and support!

73,
Fred Joly
N5BDJ

Mike-VA3MW

https://www.resplendence.com/latencymon