This really isn’t a spectrum analyzer, Without the ability to actually analyze the RF signal It becomes nothing more than a simple band scope.

In order for it to be classified as a spectrum analyzer, at the very minimum, it would need at least 2 markers with peak averaging or hold which could then automatically calculate and display dbc . preferable it should also have a means of normalizing the display. This would give you the ability to use something like a wideband noise generator to simulate a tracking generator. This would give you the ability to sweep filters and measure their frequency response.

I’m not sure how hard it would be to add those tools but doing so would transform this from a toy to a useful tool