Receive a QRSS signal on the HF bandsCheck out
https://qrss.org/ for a list of frequencies and fire up a QRSS grabber software like Argo (I2PHD), Spectrum Lab (DL4YHF), LOPORA (PA2OHH) or QrssPiG (HB9FXX). There are signals transmitting 24/7 on most bands that are easy to copy.