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Just received one TinySA from R&L and testing the unit, updated firmware and calibrated.
I have a question - I see an increased noise floor at 1Mhz and below on the LOW input, it does look the same unconnected or with a 50ohm termination.
Does it look similar on most units or is something specific to this one? Is normal to have spike around zero that will decrease rapidly but I try to understand the specifics for Tiny SA and could not find an example. Just power on the unit and set center freq to 1Meg. Also if someone does know the explanation for the stairs like visible structure.
Thank you for a great little SA.

This is normal
The stairs come from the stepwise increase of internal amplifications of the auto AGC algorithm
If you want to measure very weak signals below 1MHz I suggest to set the AGC to on? (not automatic) and the LNA also on (not automatic)
See this video with very detailed explanation:?

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I am amazed to see how good this is working for the price. The PC software is also working great.

Thank you Erik!