Icom Icf4003 Programming Software Work [best] -

A high-quality OPC-478 (RS-232) or OPC-478UC (USB) cable.

Windows often assigns a high COM port number (like COM12) to USB cables. The Icom software often defaults to COM1. Open on your PC. icom icf4003 programming software work

You need the Icom CS-F3001 cloning software (this covers both the F3003 VHF and F4003 UHF models). A high-quality OPC-478 (RS-232) or OPC-478UC (USB) cable