We have 35 registered stations of which 17 are currently online and transmitting data. The other 18 will hopefully come back online soon!
That is 48.6% of our stations runnig please help us make that more!
The data reproduced here is just for your interest.
We can not guarantee accurancy of any value but we always try to improve our algorithms.
The stats on this page are being recalculated every three seconds so there is no need to hit the refresh button every other second.
Stations without recent data are removed from the list after some time.
First read our instructions
on how to build your own receiver station if you have not done so already.
If you see low plane counts on your station, that is not that bad because every bit helps us creating the big map. :-)
Nevertheless there are so things you can do to improve your receivers reception.
1. Receiver position
Due to the relatively high frequency of 1090MHz ADS-B is not very good at traveling trough any sort of material. Hence a clear line of sight bethween the plane and your antenna is critical for getting good results.
To achive a clear line of sight place the antenna outside of a building on the highest spot available. Beware of the hazard of a lightning strike on such a place and check your local regualtions and guidelines for installing antennas in such a spot.
Putting the antenna on the outside window sill instead of the inside already makes a big difference especially with modern double or triple glass windows
2. Cable loss
Every meter of antenna cable and every connector add up to the signal loss. Avoid long cable runs by placeing the receiver hardware as close to the antenna as possible. In our build plans we only use 1 meter of antenna wire and put the receiver in an weatherproof enclosure right next to it.
Avoid daisychaining connectors and adapters by buying a cable with the right connectors instead of using adapters.
As the rtlsdr receivers are not purpose build for ADS-B reception they have a fairly wide reception range and will capture a lot of signals on the neighbouring frequencys. Especially cellphone towers may add a lot of noise into the setup which will make it difficult for the software to hear the right signals clearly enoug to decode them.
A specific bandpass filter for 1090MHz drops the signal levels of frequencys which are lower or higher than the desired frequency. Using a bandpass filter can block out a good amount of noise.
The effect a bandpass has on your setup depends a lot on the position of the receivers location and its sourroundings. On a field in the middle of nowhere a bandpass may not help at all but if you are in a crowded city with cellphone towers all around it can make the difference bethween garbage and a good signal.
Please note that a bandpass adds a little bit of signal loss into the signal but the benefits are far more noticeable than that.
Always put your filter as near to the receiver as possible to filter out signals the antenna cable may pick up.
What to expect?
Given that you have a really good mounting point for your setup and you followed all our optimization instructions only earth curvature is the limit.
We regularly see distances about 550km from very high flying aircrafts (11.000m+).
Multiple of our stations are placed on hillsides giving us an impressive reach to one direction of up to 180 degrees and next to no reach in the opposite direction.
Plane count wise we have seen numbers as high as 250 Planes on one receiver, but 50 or more is still pretty good as ist clearly depends on how much air travel is going on in the skies above the station.
Normally you will see a lot lower number of aircrafts with position information, this is for three reasons:
- To decode position data we need a good clear signal in many edge scenarios we have just enoug signal strenght do decode the aircraft ICAO and thats it.
- Some aircraft do not send position info on purpose like military, police, rescue helicopters (it can vary from flight to flight if they turn it on or off)
- Smaller aircrafts have simpler Systems in them that do not send position info especially hobbyist planes (this is why you see lots of positionless aircrafts on weekends with good weather)