ke9ns Software and Flex 1500 Timing Issue

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  • Updated 3 months ago
I have noticed that when using WSJT-X / FT8 and the 1500 there is almost a three second delay before the radio actually puts out a signal from the time it goes into transmit.  I have tried both CAT and com port with the same result.  WSJT-X both v1.9.1 and v 2.0.0 and KE9NS is v2.8.0.105.  What am I missing besides my mind?
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Don - kx9q

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Posted 11 months ago

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Dudley - WA5QPZ, Elmer

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Don,

That is really too slow,  you do need a fast computer,  low DPC rates VAC working at it's best.   Try stopping and restarting VAC,  or reboot,   and run Latmon from Resplendence SW..   Also make sure that all the sample rates for the audio from radio to Sound mapper to VAC are all the same, 
https://helpdesk.flexradio.com/hc/en-us/articles/202118418-Sample-Rate-Synchronization-between-VAC-a...

Windows has a tendency to set the Sound mapper for VAC lines to 44100 instead of 48000 for the sample rates,  and has to constantly resync.  

Hope this helps,
Dudley

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Don - kx9q

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Hi Dudley

the computer is a Dell XPS 8700 with i-7 CPU at 3.6 ghz (8 CPUs).  There is 16gb of ram.  The OS is WIN 10 Home 64 bit.  All the drivers are up to date so based on this info the PC is more than adequate.  I have run LatencyMon  and it shows the highest measured latency was 888 us and the avg is 136 us. It also says "system appears suitable for handling real-time audio and other tasks without dropout". The audio sample rate is 44800 on the computer, VAC and in the Flex 1500.  Right now it looks about 1 sec delay from transmit to power out and immediate if I put the radio into transmit via the tune button.

Don
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Dudley - WA5QPZ, Elmer

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Don,

Looks good, but the 48K  sample is a better choice.  

Is the radio keying,  but no output for one second?   Is this the issue?   Are you not seeing the audio in VAC or in the Sound Mapper?   And how about with another program like FLDigi? 

Dudley
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Don - kx9q

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Dudley

My mistake it is set to 48k.  Yes, that is the issue.  I am seeing audio activity in VAC and Sound Mapper.  I am getting no output from fldigi and I am not sure why.

Don

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Dudley - WA5QPZ, Elmer

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Don,

Just make sure you have the correct VAC line selected,  I don't remember anything about a delay for output of audio from FLDigi,  if you select Tune in FLDigi,  does the radio key up and do you have at least immediate RF out at that time? 
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Don - kx9q

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Dudley

I tripled checked the VAC lines.  Input to 1500 is output from fldigi and output from 1500 is input to fldigi.   It helps to make sure that VAC is enabled :-)  Radio keys up and rf out almost immediately using fldigi.  So no issue with fldigi

Don
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Dudley - WA5QPZ, Elmer

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Great,  then you know that VAC and Soundmapper are working correctly ..   With the new version of WSJT-X ,  maybe there is some new setting that is effecting delay,  I mostly run the 6700,  but will try the latest version on WSJT on a 1500 to see if I can find it. 

Dudley
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Dudley - WA5QPZ, Elmer

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I brought up WSJT-X  version 2.0.0.784f75   CAT set for TS-2000,  virtual 2 as input and Virtual 1 as output ,  works great on 1500 running Darrin's SW .   Radio keys and then audio starts.    Sure you do not have Fox / hound enabled?   I will let it run during the day ,  check on it later.. 

Dudley
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Dudley - WA5QPZ, Elmer

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Don,

It took several hours,  but finally got the added delay..   I seems to be in the VAC link in PowerSDR,  once it occurs,  just toggle the VAC1 button and then the radio will have output at the same time as WSJT -> VAC -> Soundmapper  ..    I am going to lower the audio buffer size down to see if that will help the issue.    Should let Darrin know of this issue.

Dudley
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Erika - KØDD

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It appears this issue is still haunting the 1500 VAC and KE9NS.  Between everybody's computer clocks being out of sync AND buffer sizes...  I could tell you where I had my settings up to a few weeks ago with the latest of everything however no radio here anymore.

I ALSO had severe CW sending issues mutating the keying with the paddles right into the front panel.  Took setting the buffer size really short and making sure all the sampling rates are set the same for everything.  A major issue is the USB port speed.  I also found resetting the VAC would fix that time shift, I did a LOT of Resetting my system clock...  I watched the reported time differences and if they grew too high would resync my clock.  If there's an errant stations clock I have used TIME FUDGE to get the clock within their problem.  Using 2013 Dell XEON Precision T1650 W/S with 16 Gb RAM, here...

With the 1500 it appears everything needs to be perfect or you WILL have issues with one mode or the other...  Echos on SSB monitor also noted when things got out of WACK... There's a LOT of traffic running on that tiny USB cable...  :-(

Erika DD