Erratic behaviour radar (EGPF4)

[Zwirko]

Recently I've noticed Flightradar24 performing oddly in my region.

Aircraft tracks extend beyond the plotted position of the aircraft itself, like so:
f24-2..jpg

Aircraft tracks split into two, like a fork:
f24-1..jpg

Aircraft positions sometimes jump around the map by distances of 10-20 miles in seemingly random directions creating a maze of tracks, like this:
f24-4..jpg


I don't know if it's important or not, but this phenomenon only started a few days a ago and always when a plane is being tracked by one particular radar (EGPF4). Any ideas as to what's going on?

[scanhorse]

We are investigating the odd behavior
proberbly only a restart of particular radar

Best regards and Thank You

[WIRRALACARS]

great coverage, lots of problems

great coverage of the uk today, but there are many sharers with the wrong time setting on their computers, i am having problems working out where the aircraft actually are, as they are jumping around wildly between uploaders, example UAE201, west coast uk/east coast uk/west coast uk/east coast uk, THY2, northern ireland/east coast uk/northern ireland/east coast uk/northern ireland/east coast uk, this happens on every auto refresh across the central uk, i think everyone should use a common time server to synchronise their pc times, i use meinberg ntp, to keep my computer time synchronised, this is really spoiling some useful, well written software, & making the point of this website useless

[Anmer]

Doesn't the time stamp comes from the ModeS message?

Can you tell us which "radar(s)" is(are) causing problems?

[WIRRALACARS]

its either their time or home location is out, across the cetre of the uk aircraft are bouncing around everywhere, as they swap from feeder to feeder, 1 culprit is EGPF4 around cumbria area

[WIRRALACARS]

NET2 is having problems as well, which is unusual for his radar

[Anmer]

What's the main symptom? Is it the aircraft icon jumping forwards/backwards a little bit or a lot or do the trail looks odd?

I've just seen AAL47 jump back a few hundred miles.

[WIRRALACARS]

its both, some have a difference of about 50 miles, but some are upto 150/200+ miles out, but only across the north west/central UK

[Anmer]

NET2 is having problems as well, which is unusual for his radar

Net2 is a combined feed from dozens of different "radars". Net2 was upgraded earlier this week and may be experiencing a few hiccups. I've advised the person concerned.

[WIRRALACARS]

i though it was odd, as the NET2 radar is usually spot on,
hopefully EGPF4 will sort his out & we'll get back to normal

[Anmer]

I'd anticipate Net2 will be sorted.

Something to bear in mind is there are different makes and quality of receivers. Net2 gets feeds from the Kinetic SBS-1 model range.

[WIRRALACARS]

i have only noticed the problem starting over the past few days, coverage has been great, hopefully it will sort itself out, lol,
i'm hoping to get a micro-ADSB soon so i can start feeding, it should cover quite a bit & be online 24/7

[Anmer]

Merging looks a good idea.

[scanhorse]

Now Done
best from
Ulf

[Anmer]

We think the Net2 erratic behaviour has been resolved. If anyone experiences it again, please post here.

Thanks.