This page is about receiving digital signals that (almost) all aircraft broadcast on 1090 MHz.
In the past, aircraft were spotted by the radar at the airport, the reflected rays were received by the radar and so could be determined where the plane flew. Nowadays the aircraft themselves send the information through all kinds of sensors and GPS, the aircraft nowadays know very well where they are, how high they are flying, the speed and also the temperature and air pressure in the area are transmitted and much more information.
Using a Raspberry (small computer) and a DVB-T USB receiver you can receive radio signals in the air, by using ' dump1090 ' software you can follow the aircraft via ADS-B. (Automatic Dependent Surveillance-Broadcast).
The data that NL3EHV daily captures of these aircraft will be sent to 4 different websites that in turn make it visible to the general public.
(It's about 3-5 GiB of data to upload)
And this is what's currently flies (live) around this globe, you will see later that NL3EHV only receive a small part of the total..
The Raspberry Pi3 in action and Snoopy watches that everything continues to work.
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On the following links you can see the status of the Raspberry Pi3 and what NL3EHV currently receives.
Aircraft also transmit a so-called Squawk code, above is a message Squawk 7600 Radio Failure.
Very annoying at over 12 KM height. In this type of messages becomes the airplane, on this website, purple.
(and probably also the pilot)
Other code's are:
7500 - Hi-Jacking 7600 - Radio Failure 7700 - General Emergency
