K3 repair - deafness after HI RFI warning M0VFC Thanks for sharing! This was 3 years ago I also found the K3 total deaf after HI-RFI warning. Need to have the K3 service manual opened with PDFD reader ( I prefer Sumatra for PDF) In my case, D25 was fine, but the signal is stopped in the KXV3 by D5, which is a BAP64-4 . The issue was caused by transmitting on an antenna very close to the K3 antenna on the same band. After checking the RX preamp on the main board, I found that preamp Q4 and the post-preamp were undamaged and still sensitive to hand effects. Connecting a temporary antenna to the 80m band filter produced normal expected signals, and receiving through the sub-receiver AUX port was also fine. However, the rear SO239 antenna inputs were completely dead. The antenna signal travels a long path in the K3: entering via SO239 1/2 at the KAT3 ATU, passing through to P70 on the main RF board, going through the SWR bridge where the ANT signal is grounded...
Ham radio in JO33hg31 53.15N 6.35E