? Not that it helps considering the disposable nature of the Nano.? But my guess is bypass capacitor issues on the Nano.? I guess if some determined soul wanted to verify they could attach a cap in parallel or swap out the bypass caps to see.?? Again seeing the cost it would be more of an educational adventure.?
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?I didn't read all the details but can you pick up the noise with only the Nano powered up?? That helps isolate it down to the Nano and poke around and see.?
73, Michael
KM4OLT
Michael Monteith