Frequency: 446.5 MHz
Received with RTL-SDR (R820T) + SDR Console v3.4, N-FM, about 10 kHz wide, homemade QFH 436 mhz antenna.
Signal strength about -100 dBm
Pulses exactly once per second, about 0.5 s on and 0.5 s off. No speech and no clear tones, only wideband hiss in the audio.
RTL_433 gives no output.
EDIT: signal was received in Denmark
Hey
I am curious to identify this signal especially there is line between bursts in beginning of the video , every morning broadcasting .
So I can't find a decent website that I can cross check previous satellite pass (maybe I'm bad at it and can you provide me one?).
Also I assume this is a satellite due to the doppler shift effect, but correct me if this is something else. I captured it 12:26:14 UTC, Oct 4 2026
What could this be?
EDIT: Radiosonde
There is this signal which can be heard across various frequencies in the HF range; I’ve heard it multiple times while dx-ing.
Does anyone know what it is?