Oracle VM VirtualBox
Ubuntu 18.04
GNU Radio 3.7
SDR#
ADALM-PLUTO

SDR# baseband recording, sample rate 1.024 MSPS, format 32 bit IEEE float.

gnur.jpg
https://i.ibb.co/Ld0g6ZD/gnur.png

sdrscr.jpg
DC spike ... GNU Radio DC blocker does not fix it. Gr-correctiq block?