I’m not sure you’re in the correct thread, if you just want to use your airspy for ADS-B, use airspy_adsb as the decoder and just feed it into the original dump1090-fa.
This effort here is nice but it’s not the most effective way to use your airspy for ADS-B.
These links will get you going with airspy_adsb, the ADS-B decoder written by one of the airspy creators.
GitHub - wiedehopf/airspy-conf: Configure airspy_adsb for use with readsb or piaware.
HOWTO: Airspy mini and Airspy R2: Piaware / dump1090-fa configuration