I've been feeding ADS-B Exchange for a few years however I hadn't checked it recently. Flightaware on Pi4 running 64bit Buster. adsb-exchange install script. 'ADS-B-FEEDER_01_40_108' (Region 3A) - ADSBExchange 'ADS-B-FEEDER_02' (Region 3A) - ADSBExchange MLAT is stable on Flightaware, however on adsbexchange it fails to sync. Position and antenna height set as accurately as possible. The only oddity that I can see is that my region is the Northern UK when I am located at the same Latitude as Cambridge. Note: Other feeders near to me can sync with stations in the Northern region. Any suggestions?
Reinstall the feed scripts: https://github.com/ADSBexchange/feedclient It will ask the location. Your local map showing the correct location is not connected to what is set for the feed client for adsbexchange. Also possibly use a name that's somewhat unique.
Thank you wiedehopf I ran those scripts. Now Stradishall_01 and Stradishall_201. Still pretty much the same.
I'm a bit at a loss. Are you by chance putting minutes / seconds in instead of decimal lat long? Check your location here: https://www.freemaptools.com/elevation-finder.htm I know probably not but i can't really find a good reason for the issues, so grasping at straws. So i'll presume you're using an airspy receiver? You can try with 12 MHz possibly if you're running 20 MHz currently. FA might have limits less strict than our server code does. I can pretty clearly see very little but clearly present 5 / 10 microsecond jumps in our server logs.
Yes Airspy R2 with GPS reference (I know it isn't required, however it helps others find their required PPM offset. Currently running at 24MHz, I will reduce 201 to 12MHz.
Tried 12MHz, that worked. Tried 20MHz, that worked too. 24MHz seems to be a no no, as we say here. Thanks again wiedehopf
24 MHz is indeed problematic as the USB 2.0 system runs at its limits. If anything is lost at the SDR (not transferred via USB), the synchronization is lost. So the GPS reference actually goes into the R2 clock input? That's fancy
The Airspys are connected via USB3 to their respective Pi4s. The two Airspy R2s are fed from the same antenna with a Minicircuits 3dB splitter. This helps with tweaking the settings of one against the other. Yes correct, the two feeds are on the same 10MHz reference.
But the Airspy R2 is USB 2.0 and the pi4 must observe and is limited by that protocol and its bandwidth.
