Decoding FLEX pagers using RTL-SDR and Linux
Superkuh2 demonstrates how to decode FLEX pager radio traffic. He uses gr-pager and zarya’s implementation of it on the Linux platform with the RTL-SDR dongle.
This script runs at a 250 KS/s sample rate and decodes one 12.5 KHz channel only. Internally it uses gnuradio’s optfir to generate low pass taps stopping at 12.5 KHz to use witih a frequency xlating FIR filter. It then passes what’s left to gr-pager’s flex_demod.
Here I show such an activity with the osmocom gr-fosphor visualization tacked on to patchvonbraun’s gnuradio multimode receiver for context.
For more detail on this process, visit SuperKuh’s website.This entry was posted in digital radio data, Linux, RF, SDR and tagged decoding, FLEX pagers, GNUradio, RTL-SDR.