Yes. Hitting L/O once temporarily locks out. When you turn the scanner off and back on again, whatever you locked out will scan again. Hitting L/O twice permanently locks out. The only way to unlock is to go through the menu, I think. If anyone knows of a different method, please post. And yes, this works on any channel. However, I believe it you just want to lock out a channel, you don't have to hit Function first. Just L/O or LO/LO. That's the way it works on my 996T but I don't know if the XT models are different. I wouldn't think so, though.You are correct i didnt push l/o twice if ir happens again i will try it again . Does that work on any channel?