The unit modifies the radio's fundamental receiver system from a double-conversion to a when operating in FM mode.

Because the UI-7 is now a legacy component, there are a few things to keep in mind:

The UI-7 is most commonly associated with the (a popular entry-level HF rig), but it is also compatible with several other models in that era's lineup: IC-721 / IC-721M / IC-721S IC-725 IC-728