There is a VLF upconverter on the DXexplorer website. On Christmas Eve there is a special transmission from the historic alternator 17.2kHz CW transmitter SAQ in Sweden.
See https://en.wikipedia.org/wiki/Alexanderson_alternator .
See also https://alexander.n.se/en/
Please note, this converter is fine for a peek "down there", but amateur signals usually are weak and need very high stability, very accurate frequencies and very narrow bandwidths. Details of my own VLF experiments are on my main website.
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