HP iPaq Business Navigator 600 prefers channel 11 for Wi-Fi

Since last month I am the happy owner of an HP iPaq Business Navigator (Thanks D.D.!)

Until now, everything is working fine except that at home, I was unable to connect to my own Wi-Fi network. After struggling a bit, I discovered that the connection was always successful if I set my AP to use channel 11. Since then, connection worked flawlessly!

And cut!