# Choose 11025Hz for the intermediate IF/audio frequency
airspyhf_rx -f 144.66 -a 768000 -r stdout | \
csdr fir_decimate_cc 69.65986394557823129252 0.005 HAMMING | \
csdr fmdemod_quadri_cf | csdr limit_ff 0.5 | csdr deemphasis_nfm_ff 11025 | \
csdr fastagc_ff | csdr limit_ff 0.5 | csdr convert_f_s16 | \
/usr/local/bin/direwolf -c ~/bin/sdr-1200bps.conf -t 0 -T "%FT%TZ" -r 11025 -D 1 -B 1200 -
rtl_fm -M fm -f 144.64M -p 36 -s 48000 -g 42 - | /usr/local/bin/direwolf -c sdr-9600bps.conf -r 48000 -D 1 -B 9600 -
rtl_fm -M fm -f 144.66M -p 36 -s 24000 -g 42 - | /usr/local/bin/direwolf -c sdr-1200bps.conf -r 24000 -D 1 -B 1200 -
# number after -p: freq offset (+36ppm) <- this is critical for detecting signals
rtl_fm -f 144.640M -s 22050 -p 36 -g 42 -l 10 - | ./multimon-ng -t raw -A -s AFSK1200 -a FSK9600 -
# rtl_fm -f 88.1M -M fm -s 170k -A fast -r 32k -p 36 -g 20 -l 0 -E deemp | play -r 32k -t raw -e s -b 16 -c 1 -V1 -
[End of memorandum]
| ACHANNELS 1 | |
| ADEVICE null null | |
| CHANNEL 0 | |
| MYCALL CALLSIGN | |
| IGLOGIN CALLSIGN ACCESS_CODE | |
| IGSERVER [region].aprs2.net | |
| MODEM 1200 | |
| AGWPORT 8000 | |
| KISSPORT 8001 | |
| PBEACON sendto=IG delay=0:30 every=30:00 symbol="igate" overlay=R lat=xxx long=yyy alt=in_meter comment="144.660MHz Receive-only gateway AFSK 1200bps" | |
| IGTXLIMIT 6 10 |
| ACHANNELS 1 | |
| ADEVICE null null | |
| CHANNEL 0 | |
| MYCALL CALLSIGN | |
| IGLOGIN CALLSIGN ACCESS_CODE | |
| IGSERVER [region].aprs2.net | |
| MODEM 9600 | |
| AGWPORT 8000 | |
| KISSPORT 8001 | |
| PBEACON sendto=IG delay=0:30 every=30:00 symbol="igate" overlay=R lat=xxx long=yyy alt=in_meter comment="144.640MHz Receive-only gateway GMSK 9600bps" | |
| IGTXLIMIT 6 10 |