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jj1bdx/getmpx-examples.sh

Created March 1, 2019 14:12
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Scripts to retrieve MPX (FM demodulated) output for FM broadcasting with RTL-SDR / Airspy and csdr
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getmpx-examples.sh
#!/bin/sh
# 88.1MHz (10Msps, Set 500kHz upper freq)
# CF32 IQ signal decimated to 768kHz first,
# FM decoded to real signal,
# then decimate by 4 to 192kHz CF32 output
airspy_rx -r/dev/fd/1 -p0 -f88.6 -a10000000 -t0 -g7 | \
csdr shift_addition_cc 0.05 | \
csdr fir_decimate_cc 13.028333333333 0.05 HAMMING | \
csdr fmdemod_quadri_cf | csdr fractional_decimator_ff 4
#!/bin/sh
# 88.1MHz (1Msps, Set 200kHz upper freq)
# CF32 IQ signal decimated to 500kHz first,
# FM decoded to real signal,
# then decimate by 2.604166666 to 192kHz CF32 output
rtl_sdr -s 1000000 -f 88300000 -g 3.7 - |
csdr convert_u8_f | csdr shift_addition_cc 0.2 |
csdr fir_decimate_cc 2 0.05 HAMMING | \
csdr fmdemod_quadri_cf | csdr fractional_decimator_ff 2.6041666666666
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