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Al's picture

Thanks very much Giorgio, glad you like it.

I've used a relative rather than absolute scale as the gain of the dongles can vary by a large amount and I don't want to lull users into a false sense of security by using any sort of absolute units.
You can set a gain offset in Edit->Radio Devices if you have access to a signal generator to provide a known reference.  Likewise the input impedance varies so you'd have to measure that as well to calculate the voltage.

I agree that setting scale limits needs to be improved, at the moment you have to turn off auto-ranging on the toolbar and zoom the axis accordingly.  I'll try and make this the next addition to the software (maybe a right-click on the button for more options...).

Enabling 'real time' plotting on the toolbar will always be slow unfortunately.  I use the matplotlib library which produces great looking plots but it wasn't the best choice for fast plotting; it's aimed more at producing documentation-quality graphs. 
For this reason there is also a 'Preview' display which is much faster (select it from the list at the bottom right of the window).  You can also right-click on the graph and select 'Limit points' (the limit can be changed in the settings).

One final option is to reduce the dwell time, but shorter dwell times reduce the chance of detecting non-continuous signals.

Hope that helps.