SDRUno is a great and useful program, and the latest enhancements such as calibrated power reading etc. really make it shine as a spectrum analyzer.
BUT, what would really round it out for spectrum analysis use would be a couple of features which are standard on most spectrum analyzers today, such as:
1) Markers. Movable markers (2 or more) which can be positioned anywhere as needed and would feed a readout of frequency and power level at the marker position(s).
2) A direct digital readout of power level in dbm for the signal at center frequency.
3) A readout and adjustment of the total displayed frequency span, with setting for span per division.
4) An RBW or VBW setting, such as that in HDSDR to aid with detailed signal analysis.
5) A direct reference level setting - i.e. the signal level referenced at the top horizontal line.
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Perhaps it would be easier and maybe even better to offer separate program with these features for industrial & scientific uses. This would make the RSPs 1 & 2 very useful as test equipment
