dump1090-mutability unusual behavior.


#1

I recently switched from FlightAware dump1090 to dump1090-mutability. Install went fine, I’m running v1.13, with args:


/usr/bin/dump1090-mutability --net --gain -10 --ppm 0 --oversample --fix --phase-enhance --aggressive --lat 45.448424 --lon -123.040689 --max-range 300 --net-http-port 8080 --net-ri-port 30001 --net-ro-port 30002 --net-bi-port 30004 --net-bo-port 30005 --net-sbs-port 30003 --net-fatsv-port 10001 --net-heartbeat 60 --net-ro-size 500 --net-ro-interval 1 --net-buffer 2 --write-json-every 0 --json-location-accuracy 0 --quiet

No problem feeding to FA, counts seem roughly the same as before.

My issue is with the local browser… Sometimes I see many local flights with altitudes < 10k, other times only flights > 10k. At the same time I am seeing local, low altitude flights I don’t see a distance column in the stats and no range rings.

When I’m only seeing high altitude flights, I can see distances. This behavior might change back-and-forth by merely refreshing the browser.

Not sure why I’m seeing this. I did try restarting dump1090-mutability, but no change in the behavior when I do so.

Ideas anyone??

Thad MacMillan, n7ilk


#2

Nope, no idea what’s going on there. Can you attach screenshots of the two cases?


#3

Oh…

This means “don’t tell the webmap where the receiver is”.
If you do that you won’t get range or distance rings.

Still don’t know why you’d sometimes see them and sometimes not - it sounds almost like e.g. you have a hostname that’s resolving to more than one IP so it’s luck of the draw which one you connect to.


#4

Bingo! That seems to have done it. I was disabling the JSON writes to /run/*, and must have commented out “one too many” JSON lines in the config file.
I think the issue with apparently missing the low altitude flights was just a matter of how the list sorts differently when there’s the distance column

Still not sure why I was seeing two different result sets. Definitely only one dump1090-mutability running on my receiver.

Thanks for all the work you’ve put into making a really nice set of enhancements to the program!

Thad


#5

Ah, yeah, the default is to sort by distance if it’s there, otherwise by altitude.

BTW, you can change the sort criteria by clicking on the column headers.