I have see comments that the low output power was due to the power supply voltage, which should be 15V for full output. However, in a product comparison tabel on this web site I see the following:
SunSDR2 QRP: 12V
SunSDR2 PRO: 15V
Sun SDR2 DX: 13.8V
Question: the DX version can't handle 15V?
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Please refer to page 14 of the SunSDR2 DX user manual.
You must make sure that you check the power coming to the SunSDR2 DX with a voltmeter, because the display in the ExpertSDR2 software does not show correctly.
The SunSDR2 DX shows in the ExpertSDR2 software about 0.5V less than actually arrive.
I have connected this voltmeter with Powerpole connectors between power supply and SunSDR2 DX: