FlightAware Discussions

Error message ? (Piaware 3.8.1 / Flightstick Pro plus

Something wrong in my setup?

– Logs begin at Wed 2020-07-01 17:17:47 UTC, end at Wed 2020-07-01 17:25:30 UTC. –
Jul 01 17:18:02 P-1 systemd[1]: Started dump1090 ADS-B receiver (FlightAware customization).
Jul 01 17:18:03 P-1 dump1090-fa[592]: Wed Jul 1 17:18:03 2020 UTC dump1090-fa 3.8.1 starting up.
Jul 01 17:18:03 P-1 dump1090-fa[592]: rtlsdr: using device #0: Generic RTL2832U (Realtek, RTL2832U, SN 00001000)
Jul 01 17:18:03 P-1 dump1090-fa[592]: Found Rafael Micro R820T tuner
Jul 01 17:18:03 P-1 dump1090-fa[592]: rtlsdr: enabling tuner AGC
Jul 01 17:18:03 P-1 dump1090-fa[592]: Allocating 4 zero-copy buffers
Jul 01 17:18:03 P-1 dump1090-fa[592]: **Detected Kernel usbfs mmap() bug, falling back to buffers in userspace

???

Maybe something here helping you:

https://www.raspberrypi.org/forums/viewtopic.php?t=244735

Side Note: Your gain seem to be too high. You should consider changing it away from AGC

Thanks ! I give it a try, just adjust it to 29.7

I am still wondering what the meaning is of:
Jul 01 17:18:03 P-1 dump1090-fa[592]: **Detected Kernel usbfs mmap() bug, falling back to buffers in userspace

Safe to ignore.

@foxhunter
how did you know the gain was too high, i don’t see any data here?

 

It is here…

1 Like

With an SDR without LNA, that’s exactly the gain setting you want most of the time.

Anyhow i’ll just leave this link here:
Thoughts on optimizing gain