Okay there's something really cool I've just learned. If you are continuously recording air pressure e.g. as part of your home automation setup or a weather station then you should really check the data of the last 24h.
You should be able to spot the pressure wave from the volcanic explosion in Tonga earlier today.

It reached my setup in Kaiserslautern at about 20:30.

The is now commercially available. First as a kit, later also fully assembled. The 4.50€ price difference makes it difficult to find an argument for self-assembly. Here is the official source of supply: rowaves.com/product/trusdx-5-b

After almost three months and more than 162 hours of learning and repeating, I have achieved what I could not quite believe in at the beginning of last October as a complete newbie without any technical background:

On 08.01.2021, I successfully passed the amateur radio exam in class E (Novice) at the Federal Network Agency in Dortmund/Germany. 😃 Today I got my call sign: DO1MIM.

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