Re: First HF radio..incensed a week ago...I think I blew up my uBitXv4.
Does your uBITX use a case kit to wire your uBITX, or is it wired direct per the wire-up directions from HFSignals?
I would be really surprised if it was the Nano that failed again. If so then there is a wiring issue that is causing the problem. You need to resolve the wiring issue(s).
Can you post a picture of the inside of your v4 uBITX? I think that you have a v4 mounted in an AmatureRadioKit enclosure, that or a custom-built enclosure that you will need to know how it was wired.
Trying to understand what you have and how to answer your questions.