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rtl_fm demodulation guide
# rtl_fm demodulation guide
# based on excerpts from: http://kmkeen.com/rtl-demod-guide/index.html
# requires rtl-sdr (rtl_fm bundled), sox for audio, multimon for pager decoding
# broadcast FM radio
rtl_fm -W -f 89.1M | play -r 32k -t raw -e signed-integer -b 16 -c 1 -V1 -
# police scanner
rtl_fm -N -E -f 154.42M -f 154.75M -f 154.82M -f 154.89M -s 12k -o 4 -g 49.2 -l 70 | play -r 12k ...
# airband scanner
rtl_fm -M -f 118M:137M:25k -s 12k -g 49.2 -l 280 | play -r 12k ...
# pager decoder
rtl_fm -N -E -f 929.77M -s 22.5k -o 4 -g 11.5 -l 250 | multimon -t raw /dev/stdin
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