Rubén, Yes you are correct. High gain and Bias off. I've been running this since I got my K3 (nearly 2 years ago)and get good modulation reports. (TX-EQ is all set to 0, so no changes necessary.) 73 Arie PA3A -----Oorspronkelijk bericht----- MIC.SEL Menu? Do i have to select H or L? and Bias? I think it is H and Bias Off. -- Rubén Navarro Huedo - EA5BZ