Nice work!
3000 points will always be slow. For this kind of measurements 300 or 1000 at most should be enough. Max RBW =600kHz
Can you set Average to "min: and enable spur reduction and see if the peaks that should not be there disappear?
ADE-25MH should be same size as ADE-1
Enable view/logging, set points to 100, scan to full speed and see what is going wrong in the communication
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HBTE Files section:?
/g/HBTE/filesErik, PD0EK
