Trouble getting SDC to work

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Jim Selmi

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Feb 15, 2026, 5:51:23 PMFeb 15
to SDC Software Defined Connectors
Hello all,

I'm new to RTTY contesting. I'm an avid CW contester and have
run SDC SO2R with CW skimmers without any issues.

I'm running SmartSDR 4.1.5 and SDC 19.05x64.
Station: Flex 6600, PGXL, TGXL, AG. WIN 11

In CQ WW WPX RTTY now, running QRP - SO2R. PGXL and TGXL are off.

I have intermittent RTTY output. PTT is initiated, text sent, but no RF output.
DAX TX STREAM is yellow with "mouse over" note "The Transmit DAX channel is enabled,
 but another computer is using the stream" No other Flex type apps running (Slicemaster,
 FRStack3, etc). I have restarted Flex, computer and all apps.

I also have DIGI Modem 1 and 2 for RTTY. I lose connection Modem waterfall in New QSO1 or 2
window. What seems to make it work again is going to New QSO 1 (or 2)settings and
changing  SLICE from 1 to 2, then back to one and APPLY.

I also lose connection to DIGI skimmer spots. When this happens 
DAX IQ 1 and 2 are yellow. I can click on the IQ 1 stream in DAX turn it off and back on 
and Skimmer will restart. All IQ sample rates set at 96000

I think I have something mis-configured or possible DAX corruption?

Then every once in awhile it works :) I'm going to reload DAX and re boot everything again.

Jim
K6JS

Any ideas?


Jim Selmi

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Feb 15, 2026, 6:22:10 PMFeb 15
to SDC Software Defined Connectors
I disabled Windows 11 Core Isolation. Restarted everything -  initial startup of SDC all was working.
I made RTTY Q's. WHen I started SKM server and Skimmer 1 and 2, DIGI modem 1 and 2 stopped working.

Jim


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Andrew O'Brien

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Feb 15, 2026, 10:41:57 PMFeb 15
to Jim Selmi, SDC Software Defined Connectors
Was another slice open somewhere and using DAX TX ?



Andy


UT4LW Yuri Pavlov

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Feb 16, 2026, 2:22:03 AMFeb 16
to SDC Software Defined Connectors
I think I have something mis-configured or possible DAX corruption?

SDC does not use SmartSDR-DAX and SmartSDR-CAT. If you plan to participate in the SDC Contest, it is best not to run these SmartSDR modules at all. If SmartSDR-DAX is running, do not interfere with what is happening in this window, as you may intercept functions in this window and close them for SDC.
You also do not need to run additional SDC-DIGI modems. In the New QSO windows, modems are launched automatically, and additional modems may cause conflicts.
понедельник, 16 февраля 2026 г. в 05:41:57 UTC+2, andre...@gmail.com:
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