Many of us "cut our teeth" by making crystal sets on medium wave to receive a local station. As you know, crystal sets require no power. All you need is a sensitive headset or earpiece as all the power comes from the transmitter.
What is less well known is that a short wave crystal set can be made and great fun had. This is totally different from conventional SWLing. Signals have to be mV, not uV. It is possible to hear amateur and utility signals as well as broadcast stations. Sadly, there are fewer English language broadcasts to be heard.
See https://sites.google.com/view/g3xbm4/home/hf-mf-and-lf/crystal-set-dxing
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