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| Name | Modified | Size | Downloads / Week |
|---|---|---|---|
| fmplot.tar.xz | 2019-05-06 | 3.2 kB | |
| readme.md | 2019-05-06 | 883 Bytes | |
| Makefile | 2019-05-06 | 31 Bytes | |
| n5.c | 2019-05-06 | 6.7 kB | |
| Totals: 4 Items | 10.7 kB | 0 |
This was originally written as a way to find nrsc5 (HD FM) stations, see
https://github.com/theori-io/nrsc5/issues/103
What it does is to scan the US FM broadcast band, 88-108 MHz using rtl_power, then plot the spectrum to a .png file using Gnuplot. So you need to have Gnuplot installed, and rtl_power, which has been part of some versions of the rtlsdr suite. There are several forks of rtl_power, this was designed to work with Kyle Keene's original version. (I think)
Compile by typing make, run by typing ./n5, it takes maybe 15 seconds and produces a 10000 x 800 pixel .png file. You need to be able to scoll sideways in it, opening it in Firefox works.
To change it to work with a different range of frequencies, you'll need to change the frequencies fed to rtl_power in live(), also the numbers fed to gnuplot to label the X axis in run_gnuplot (the set xtics line).