390-406 MHz
390-406 MHz
TETRA networks, weather balloons on their way to 30 km, and the distress beacons at 406 MHz.
Three unrelated things share this stretch of spectrum, and a wide span catches all of them at once. TETRA carries European public safety and transport, with its cells and call setup readable and its ciphers listed in the keys view.
Just above, radiosondes transmit from every launch site twice a day, drifting in frequency as they climb, with the channel following them up. At 406 MHz, COSPAS-SARSAT beacons transmit an identity and often a position, mostly as tests.
$ waveshark --tune 403 --span 2400 --location 53.34,-6.26What lives here
- COSPAS-SARSAT beaconsDistress beacon identities and the position they encode, drawn on the map the moment one transmits.
- TETRAThe network, its cells and who is called, clear calls heard as speech, and a wgpu key search on the ciphers in a source build carrying the tea feature.
- RadiosondesWeather balloons on the map with serial, height and climb rate, in eight families, with the channel following the transmitter as it drifts.
Every band, one receiver.
The decoders do not follow the dial: everything inside the span runs all the time.
All the bands