So I see on the leader board there are several feeds with a max range of 325NM and none with more. Is there some limit at 325NM? Also, in 1090 graphs my max range is showing as 275 but on the leader board my max range is 320. How come?
#Max range 325 on leaderboard
solemn hemlock
peak yoke
I think this is most likely due to the "line of sight", your antenna need a direct view of the horizon, at 325nm (~600km) i don't think it can "see" anything anymore, but i could be wrong
some physical limitation
cinder tree
it's not a view of the horizon that you need - it's a view of the aircraft sending the signal. Range depends on the altitude of the aircraft and the elevation of the receiving station, as well as terrain surrounding it. The range for aircraft at 40,000ft with a receiver on flat land at sea level is something a little under 250nmi, I believe.... but it's going to be more for a receiver on top of a mountain, etc.
readsb has a cut-off for max-range - anything further out is discarded as a probable error. It defaults to 300nmi, but the ADSBx image changes it to 450. I'm not sure what you get if you use the script install method.
It may be that the leaderboard has a similar max range cut-off at 325 - not sure....
solemn hemlock
Coincidentally, this morning I got a track that is clearly an error which has put my peak range up to 386NM. Will be interesting to see what the leaderboard does with that. But seems to me there is an anomaly here that may be skewing the results on the leaderboard.
digital notch
Coincidentally, this morning I got a track that is clearly an error which has pu...
Atmospheric ducting of the signal can easily make that possible.