Problem RTTY SunSDR2+ SDC,

[ea7...@gmail.com]

Hello,

 

Yesterday I participated  in the XE-RTTY contest. My setup is as follows:

 

. ExpertSDR2 x64 version v.1.3.1. connected via TCI to SDC without problem.

 

. SDC Software version SDC 19x64.

 

Mode en sunSDR2 is DIGU,  Offset: 1.600 Hz y sync with RX.

 

OFFSET: 1.600 Hz  and sync with RX.

 

En SDC Software

In DIGI server, setup modem:

 

OFFSET: 1.600 Hz and Sync Width Waterfall with RX filter band.

 

In Setting the RTTY transmit signal:

 

 

OFFset: 1.600 Hz y sync with Rx filter band.

 

 

I believe there is nothing left to configure; everything works correctly, except for the following:

 

Both when transmitting and receiving, the signal is off-center; there's about a 100-150 Hz signal shift. This means that in RUN mode there's no problem because the station tunes to my frequency, but in S/P mode it doesn't. Similarly, when I search for callsigns in the Spotlist, I'm off-center.

Where is the problem?

Can someone please help me?

Thank you ,

Antonio, EC7YY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[UT4LW Yuri Pavlov]

This is because the ESDR program does not work correctly for the RTTY modulation type. Standard: the frequency of the RTTY signal is the frequency of the signal on the right (the one with the higher frequency), not the center between them, as the ESDR developers mistakenly believe. Contact them and have them correct the errors.

To try to fix the SP situation, enter the offset into the skimmer.

[ea7...@gmail.com]

Hi Yuri,

Thanks for replying... I'm honestly amazed!

Could you please tell me which version of SDC works correctly? I've been using both software programs for years and never had any problems.

Anyway!

Thanks,

Antonio, EC7YY

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[UT4LW Yuri Pavlov]

Always use the latest versions. Today: 19.0508
I can't verify this, but I've been told that everything works in it without additional offset settings in Skimmer.

понедельник, 9 февраля 2026 г. в 14:52:12 UTC+2, ea7...@gmail.com: