Perl updating hash of arrays
See tholin's annotated 24 hour rtl_power spectrogram. (view full window) This page is mostly just notes to myself on how to use rtlsdr's core applications, 3rd party stuff using librtlsdr and wrappers for it, and lots on using the gr-osmosdr source in GNU Radio and GNU Radio Companion.Below is a zoomable 37200*31008 pixel 5 day long spectrogram I made using rtl_power's FFT mode and This isn't a "blog", don't read it sequentially, just search for terms of interest or use the topics menu.
The highest safe sample rate is 2.56 MS/s but in some situations up to 3.2 MS/s works without USB dropping samples (RTL2832U drops them internally).While the sampling bandwidth is only 2.56 MHz the frequency can be re-tuned up to ~40 times a second.With frequency hopping you can survey very large bandwidths.Luckily there are Linux and OS X native binaries packages with all dependencies (ie, gnuradio) these days.For doing diagnostic and low signal level work Linrad is full featured and fast.
For general use SDR# is probably the best application for windows with secondary mono-based linux and Mac support.