Looking back at your previous posts, sounds like you are using some sort of DC-to-DC converter to get 12v. ?And if so, then Raj likely called it right when he said you had converter noise. ?It could be that this DC-to-DC converter was outside its spec when you tried to transmit, and when you stopped transmitting there was a voltage surge that damaged the radio. ?(Spec's on $3 ebay boost mode switchers tend to be rather generous, so when it says 3A and adjustable up to 12V, that does not necessarily mean it will do 3A and 12V at the same time.) ?I'm guessing here, as you have not told us what radio you have, what VFO, what this 12v DC power supply is, what knobs you have twiddled on that DC supply, etc...
I'd recommend starting out with batteries, not some switching power supply. ?Ideally something capable of at least a couple Amps, like a motorcycle battery. ?With a 2 Amp fuse in-line. ? And if you have trouble with the Raduino, then back off to the analog VFO by installing the coil. ?But all that advice might be a bit too late here.
In answer to the original question, this is your Bitx40 customer service.
Jerry, KE7ER
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