This is probably one of the simplest receivers you will find. It is really effective and has copied lots of QRP signals from across Europe.
It is unbelievably simple. If you can think of a simpler RX that is as effective I would like to know! It is on my main website and in my free PDF book.
By changing the tuned circuit it would work on other bands like 160m or 60m. Not sure where it originated, but you can find lots of similar circuits.
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