"When ants are conn to the radio's ATU, the tune is normal..." Could this be a hint? Have you replaced any jumpers between the radio and tuner? Do you have any antenna switches in that jumper line? What are the exact symptoms of your problem? On 7/16/2025 12:40 PM, dave ingebright via Elecraft wrote: -- Joe Hutchens AJ8MH - Radio Marquette, MI