Radiosonde ⁽¹⁾

For some time now I had been running a radiosonde receiver based on one of the small Lilygo LoRa devices with a built-in display. It used wifi to connect to our LAN and thence off to its reporting platform https://sondehub.org/. Because it used an antenna in the loft it never did very much with regard to monitoring but it was a no-cost 'why not' type of thing. However, after some time now the display was dimming and it would often have issues if the wifi hub rebooted. So I really wanted a no-wifi solution and found one based on a Pi and an RTL-SDR dongle.The software and setup instructions I followed can be found at https://github.com/projecthorus/radiosonde_auto_rx/wiki and worked semlessly. The setup creates its own web server, by default at port 5000. After a few days of nothing it finally recorded two hits overnight: Not too bad for a 70cm Big Wheel in the loft. Looking at the data, for the first entry which is the one approaching Liverpool data was received when it was at 11,500m altitude down to 9,521m at 403.4MHz. The second trace out to sea was on 405.1MHz and from 19,670M to 25,349m at the end. The traces…