Just to report back on this. Turned out I forgot to terminate the cable with my scope measurements. This gave me wrong peak-to-peak values and so my calculations for the dBm values I expected were incorrect. After using a T-connector with 50 ohm termination I got mush closer to the readings of the SDRPlay. Now the difference is only 2 dBm, which could be the cable/connector loss (different cables for scope / SDRPlay). The readings are very consistent. So I’m very happy with it. Great tool! Thnx.