Meteor M2 capture notes

gistfile1.txt

# First capture the raw IQ file
# ppm value will vary across dongles. It took some trial and error with rtl_test to figure this out.
rtl_fm -f 137.9M -M raw -s 140k -g 49.6 -p 7 METEOR-raw.iq
# will be giving this a try tonight: -s 150k -F 9

# next convert to audio file prior to demodulation
sox -t raw -r 140k -c 2 -b 16 -e s METEOR-raw.iq -t wav METEOR.wav rate 96k

# convert wav to qpsk
# not using batch option right now, but you can do this if you want.
# source: https://github.com/dbdexter-dev/meteor_demod
met_demodulate -o METEOR.qpsk METEOR.wav

# decode qpsk to bitmap (appends bmp to filename)
# using the suggested rbg options do not give me good results. I'm not happy with these results either,
# but I can at least run the output through Preview.app to adjust the color levels somewhat.
# source: http://www.5b4az.org/  (C port of https://github.com/artlav/meteor_decoder)
met_decoder METEOR.qpsk METEOR

# convert bmp to png (imagemagick)
convert METEOR.bmp METEOR.png