This is a Debug version , the main purpose is for debug and build MMDVM repeater , hotspot .
If you get one of my MMDVM Repeter board , you may need this tool , easy to DIY your project.

In Pi-Star, WPSD, J-Star,
Login ssh mode,
Enter: sudo pistar-mmdvmcal 
You can see:

D        DMR Deviation Mode (Adjust for 2.75Khz Deviation)
L/l      DMR Low Frequency Mode (80 Hz square wave)

Test it ! 
You can clearly know whether your device perfectly supports the setup of digital relays.

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Support platform:
Windows 7+

Suppport Devices:
RTL-SDR V1 to V4,
SDRPlay,
Other not test, maybe work .

Feedback and get the new update:
See my homepage add one of SNS message
https://www.qrz.com/db/BI7JTA