FAQ

Hi! Please use your browser's search functionality to explore this page. Search for things like 'AHRS' or 'ForeFlight' or 'SDR' to get to the rough location of your question.

What GPS should I use?

The currently recommended unit is the remote-mounted VK-162. The VK-172 is fully supported too, but may suffer from interference due to close proximity to the SDR. The RY835AI works well as a GPS however the AHRS implementation will not work, however the RY836AI has a newer chipset and can drive the Stratux AHRS code.

Is AHRS working? Can I use Stratux to power [my EFB]'s synthetic vision?

AHRS functionality is currently a GPS Pseudo AHRS but beta testing a full AHRS implementation based on the MPU 9250 is ongoing. Support for synthetic vision within EFB's is up to the EFB developers.

How should I wire the RY836AI GPS/AHRS chipset?

Wire your chip up as follows:

• RY836AI -> Pi
  1. VDD -> PIN 02 (power)
  2. GND -> PIN 06 (power)
  3. SDA1 -> PIN 03 (AHRS)
  4. SCL1 -> PIN 05 (AHRS)
  5. TXD -> PIN 10 (GPS)
  6. RXD -> PIN 08 (GPS)

How should I wire an MPU 9250 AHRS chipset?

Wire your chip up as follows:

• RY836AI -> Pi
  1. VDD -> PIN 02 (5v) or PIN 01 (3.3 v) (power as required by the board)
  2. GND -> PIN 06 (power ground)
  3. SDA1 -> PIN 03 (AHRS)
  4. SCL1 -> PIN 05 (AHRS)

How do I view Stratux status? How do I change Stratux settings?

Visit the status page by connecting to the Stratux Wifi hotspot and visiting http://192.168.10.1 in a browser. You can view status (traffic, weather, GPS, AHRS) and change configurations.

I have two SDRs and used tuned antennas. How do I ensure Stratux uses the correct SDR for the antenna hooked up to it?

Read this for some background and updated information

You can name the SDRs to let Stratux know which to use for which purpose.

First log into the Raspberry Pi using your favorite ssh client. The user is 'pi' and the default password is 'raspberry'.

Switch to root.

$ sudo su -

Depending on the version of Stratux some or all of the following commands may be required to shut down the Stratux processes.

# service stratux stop

# screen -x stratux Ctrl-C

# screen -x dump1090 Ctrl-C

Ensure only the 978 MHz SDR is plugged in.

# rtl_eeprom -d 0 -s stratux:978

Unplug the 978 MHz SDR and plug in the 1090 MHz SDR.

# rtl_eeprom -d 0 -s stratux:1090

Plug the 978 MHz SDR back in.

# shutdown -r now

More here

I have dual SDRs. My EFB says that all of the displayed traffic is from 978 MHz UAT, but the Stratux web interface is showing no 978 MHz UAT messages and a whole bunch of 1090 MHz ES messages. What's up?

This is a known issue. Stratux reports all traffic as coming from UAT. If you turn on traffic source identification in the settings tab it will prepend call signs with either u or e depending on the source (UAT or ES, respectively).

How can I contribute to the project?

Check out the document on contributing.

I found a bug. How do I report it?

There's more information on reporting issues in the contributing document, including a bug report template. You're welcome to post bug reports on Reddit, but they're more likely to get looked at if you also create an issue on GitHub.