Having bought your RTL SDR, you will soon find yourself needing a few accessories. A decent antenna perhaps, an HF upconverter, and maybe an attenuator. To help you, [IgrikXD] ...

That’s generally a job for an oscilloscope, but if you’re clever, an SDR dongle can make a dandy crystal checker too. The back story on [OM0ET]’s little hack is interesting, and one we hope ...