There was an recent update of
rtlsdr_scan (PC Spectrum Analyser) software.
I asked the author couple of weeks ago for continuous scan recording on the hard disk, and apparently it is happening just about now or very soon (release should be dated 20/12/2016... with version from September, only last 500 scans were available for saving in cvs format).
With this new feature, the application will become really useful for radio astronomy.