Intermodulation Product Calculator
Enter two or three carrier frequencies to list the mixing products they create up to a chosen order, and see which ones land inside a protect band.
Each product is m1f1 + m2f2 (plus m3f3 when a third carrier is entered), where the whole-number coefficients sum in absolute value to the product order: 2f1 − f2 is 3rd order and 3f1 − 2f2 is 5th. Only positive frequencies are listed, one row per distinct product frequency, keeping the lowest order that produces it because lower orders are normally the strongest. Single-carrier harmonics such as 2f1 and 3f2 are included in the same set. This is frequency arithmetic only: it does not model transmit levels, receiver selectivity, mixer intercept points, antenna coupling or spectral masks, it does not know your local band plan, and it is not a spectrum-authorisation or interference determination. Everything runs locally in your browser with no storage, uploads or network access.