Icom Ic-f3003 Programming Software 'link'

Here is why:

If you try to write a frequency that is outside the radio's band split (e.g., trying to program 450MHz into a 400-470MHz radio is fine, but trying to program 500MHz will fail), the software will flag an error. Double-check that your frequencies fall within the specific hardware capabilities of your unit. icom ic-f3003 programming software