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ATU1000 Power and SWR displayed without signal injection


 

HI. I'm Ivan IZ5WRC. I assembled the atu1000 pcb but it doesn't work. Without signal injection the display shows absorbed power and SWR 9.99. These values ??are reset if I bring the RV1 trimmer cursor close to GND, but in this case when I transmit the power detection is incorrect and if I don't transmit after a while the firmware crashes and 3 inductor relays are activated. I exclude that it is the fault of pic16f1938 because if I try on a breadboard assembling the ADC part and TUNE button (but the 2n7002 and RB1 RB2 parts are not connected) the firmware is stable.?It seems as if the processor is being disturbed by something that is in the original pcb.
Thanks in advance

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