In this 50th episode of Elektor Engineering Insights, we are pleased to welcome back Sebastian from Baltic Lab. Watch the video and discover his hands-on RF projects and experiments that combine timeless radio concepts with modern Software Defined Radio (SDR) tools. The session kicks off with a high-voltage spark gap transmitter producing broadband signals at around 13 MHz using high voltage (around 20 kV) and an LC tank circuit. He explains the physics behind it, with details about breakdown voltage, pressure effects on dielectric behavior, controlled discharge and more.

Sebastian discusses how simple SDR kits can pick up signals from NOAA weather satellites and even aircraft communication through INMARSAT in the L-band, provided the right antennas are used, like homemade helical or patch antennas. The conversation also touches on the legal aspects of receiving such signals, which can vary by region.

For those interested in lower frequencies, the video also discusses longwave reception, tracking radio stations and airport non-directional beacons (NDBs) around 350 kHz, using compact antennas. Besides interesting tips to improve reception, this episode includes practical advice on SDR hardware, comparing RTL-SDR v4, SDRplay RSPdx, and nRSP-ST. Also learn how to track aircraft with software like TAR1090 using a Raspberry Pi! If you’re curious about amateur radio or SDR experiments, this episode will definitely interest you. Watch the video below:

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