Hi, I'm French so excuse this poor English. Here is the mods about the frequency range on the DJ-X1 scanner of Alinco. Before : 144 - 146 mhz 430 - 440 mhz 1200 - 1300 mhz After : 100 khz - 1300 mhz The unit powered on: -press F + FL -display show FL -Frequency Lock- -then press 2, 1, 2, 6, 1, 7 -displayed OPEN -press F + FL again Hope this can help you. Scanman.