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Hello there Lains, I want to get into radio tech, I know this sounds somewhat outdated but I really want to gain knowledge in that field. It even has some practical value to me because I would like to receive some radio-channels which are broadcasting on shortwaves. Buying an shortwave receiver is not really an option, these are quite expensive, so I thought about building one by myself. This would teach me something both about electronics and radio tech and gaining this knowledge is my first priority, receiving these shortwave channels is second. What would you recommend?

I saw on youtube such project with a simple radio (receiver), even such without any power supply iirc. I think it's a good project to learn exactly how radio and shortwave work and components are cheap

>>64217 Check out webSDR (and other similar services). Read ARRL Handbook. Visit a local ham radio club (they likely have a copy of ARRL Handbook that you can read, you can ask questions and you can also test a ham transceiver with them). Perhaps also get a ham radio license. If you end up getting a license, you should ask around the club if someone is selling an used rig but alternatively you can buy a new Wouxun (KG-UV6D)/Baofeng (UV-5R or UV-82) for about 50€.

skip the baofengs if your goal is learning about radios rather than using them (also those are vhf/uhf not shortwave) I recommend building a morse-code ssb qrp transceiver first. You can find kits like those from qrp labs and plenty of designs on the internet. I would Even if you go the kit route, looking at the schematic while you are building and testing the "blocks" of your transceiver individually is a learning experience. To understand it properly, you will need to have internalized circuit fundamentals (components like diodes, bjts, opamps, as well as structures like current sources, amplifiers and concepts like the mixing and the frequency domain). Just look for any "introduction to analog electronics" content, probably something on mit ocw. Once you've built your first radio from the schematic or kit, and know roughly what to expect from the "blocks", you should try to design your own version. Build it in SPICE first (one block at a time) and see if it behaves like you expect. Then repeat with real components on a breadboard. You will likely need to go through several iterations before you have something usable, but by that point you can truly call yourself a radio amateur.