Build a Stratux Europe on a Pi4B (Pi3B tested as well) based on a fresh Raspbian Buster Lite image.
This started as a script just for myself to build a Stratux Europe for a Pi4B, based on:
- https://github.com/b3nn0/stratux
- Raspbian Buster Lite
- Raspberry Pi4B (also tested on Pi3B)
- Pi4B connected to LAN via Ethernet cable
- boot from a fresh Raspbian Buster Lite Image with ssh enabled
- login as
piuser
sudo su
cd ~/
apt update
If you haven't yet programed your SDRs, please first follow the instructions under "Remarks - SDR programming" below for each SDR individually or otherwise just continue here:
apt install git -y
git clone https://github.com/VirusPilot/stratux-pi4.git
./stratux-pi4/setup-pi4.sh
source /root/.bashrc
cd stratux
make && make install
reboot
After reboot please reconnect LAN and/or WiFi and Stratux should work right away.
- WiFi Settings/Stratux IP Address 192.168.10.1 (default): only GDL90 can be selected and used in SkyDemon
- WiFi Settings/Stratux IP Address 192.168.1.1: both GDL90 and FLARM-NMEA can be selected and used in SkyDemon
- GDL90 is labeled as "GDL90 Compatible Device" under Third-Party Devices
- FLARM-NMEA is labeled as "FLARM with Air Connect" under Third-Party Devices, the "Air Connect Key" can be ignored for Stratux Europe
- info for experts: FLARM-NMEA = TCP:2000, GDL90 = UDP:4000 (for FLARM-NMEA, the EFB initiates the connection, for UDP, Stratux will send unicast to all connected DHCP clients)
- fancontrol modified (no PWM, on @ 60ºC, off @ 55ºC)
- as soon as flightaware/dump1090#61 is accepted, switch to https://github.com/flightaware/dump1090
During boot, Stratux tries to identify which SDR to use for which traffic type (ADS-B, OGN) - this is done by reading the "Serial number" entry in each SDRs. You can check or modify these entries as described below, it is recommended for programming to only plug in one SDR at a time, connect the appropriate antenna and label this combination accordingly, e.g. "868" for OGN.
apt install rtl-sdr -y
rtl_eeprom
will report something like the following:
Current configuration:
__________________________________________
Vendor ID: 0x0bda
Product ID: 0x2838
Manufacturer: Realtek
Product: RTL2838UHIDIR
Serial number: stx:868:0
Serial number enabled: yes
IR endpoint enabled: yes
Remote wakeup enabled: no
__________________________________________
This SDR is obviosly programmed for Stratux (stx), OGN (868MHz), and a ppm correction of "0", the ppm can be modified later, see below. If your SDR comes pre-programed (it would be labled with e.g. with "1090") there is no need to program it.
You can program the Serial number entry with the following command:
rtl_eeprom -s stx:1090:0
to prepare it e.g. for ADS-B (1090MHz) use. A reboot is necessary to activate the new serial number.
At this point you can already test your SDR and receive ADS-B traffic with the following command:
rtl_adsb -V"
Or listen to you favorite FM radio station (my station below is at 106.9MHz) by pluging in a headset and run the following command:
rtl_fm -M fm -f 106.9M -s 32000 -g 60 -l 10 - | aplay -t raw -r 32000 -c 1 -f S16_LE".
During boot, Stratux furthermore reads the ppm correction from the SDR Serial number, e.g. if the Serial number is stx:1090:28 then the ppm used by Stratux is +28. If the appropriate ppm for the SDR is unknown, here are the steps to find out (again it is useful to have only one SDR plugged in to avoid confusion):
stxstop (in case Stratux is already running)
kal -s GSM900 and note donw the channel number with the highest power (e.g. 4)
kal -b GSM900 -c 4 and note down the average absolute error (e.g. 16.325 ppm)
Once you have found the appropriate ppm (e.g. +16 as in the example above), the SDR Serial number needs to be programmed once again:
rtl_eeprom -s stx:868:16
reboot
For more information on how to use kal please visit https://github.com/steve-m/kalibrate-rtl/blob/master/README.md