npub1e6…ftteq on Nostr: npub1e2z26…yldaf Some chinese knock-offs have a direct sampling input, allowing ...

npub1e2z26rv2fk5f9k8ex3xtu6whu5425u7dvn4ju40xr4hfve5q83uqyyldaf (npub1e2z…ldaf) Some chinese knock-offs have a direct sampling input, allowing reveption below 50MHz (like higher priced ham radio HF receivers have, albeit those in muuch higher quality). With that you could try identifying HF noise like from solar power converters. With a directional antenna (a simple loop often is sufficient) you could try and track down the source.