Notes

hackrf_transfer -f145000000 -s16000000 -qr-

Test squelch:

hackrf_transfer -qr- -s 2400000 -f 433000000 | csdr convert_u8_f | csdr shift_addition_cc `python -c "print float(433000000-433100000)/2400000"` | csdr fir_decimate_cc 50 0.005 HAMMING | csdr squelch_smeter_cc 6e-05 5 | csdr fmdemod_quadri_cf | csdr limit_ff | csdr deemphasis_nfm_ff 48000 | csdr fastagc_ff | csdr convert_f_i16 | mplayer -cache 1024 -quiet -rawaudio samplesize=2:channels=1:rate=48000 -demuxer rawaudio -