Sergio,
Check Raduino to BITX40 connections.
Raudino RED to BITX BROWN wire
Raduino BROWN to BITX BLACK wire
Raj
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At 23-04-18, you wrote:
Uploaded software!
First the frequency was from 7,000 to 7,500 now 7,000 to 7,300
But nothing has changed! :(
He receives nothing! Only on some frequencies a bit of QRM
The background noise is left, I do not know if you had seen the video
I checked all the solders, all the different frequency coils ...
Nothing! He receives nothing! :(
It seems that the antenna is not connected! With or without it changes nothing!
Sergio