Version .02 of scan progam on my site;
formatting link
I have added a manual gain option for the tuner gain, fixed some things.
This just proof of concept software, but I think it could be used for EMC (pre?) testing, and it also logs the specified spectrum to a file that you can then keep as reference or supply with whatever.
You are welcome to test it and fix any errors.
This acquires a 87 to 189 MHz spectrum in linear mode with auto gain, and small buffer (resolution): ./rtl_sdr_scan -b 512 -s 87000000 -e 189000000 -l > q2.dat
Result plotted with gnuplot:
formatting link
More info about changes and how to display is in the source file.