This might be considered slightly off-topic, at least until you have read it. My computer is an older Lenovo Thinkpad X201 laptop, and is running Windows 10 Pro. I suspect my issue applies to any OS. With an Amateur Radio licence we can use WiFi channels outside the range available to Part 15 users. Q1. Where in the pc is the range of available 5GHz WiFi channels set? The highest channel that works in my machine is number 165, centred at 5825MHz, 20MHz wide. It will NOT work on the next channel up (number 169, 5845MHz centre, 20MHz wide) Q2. How do applications read this information? A program I use called InSSIDer that displays WiFi activity shows channel 165 as the highest available. How does it know? Q3. Is there a tool with which I can read this information? Q4. Is there a way I can edit this information to extend the range to higher channels? Thanks. RobK7QJ