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The is an optional internal plug-in board designed for vintage Icom HF transceivers from the late 1980s and early 1990s. Its primary purpose is to add FM transmit/receive and AM transmit capabilities to radios that originally only supported AM/SSB/CW reception. 🛠️ Technical Specifications

Shortwave AM: Enables you to transmit on AM for "retro" style communications, often found on the 40-meter and 75-meter bands.

However, you have two options:

Note on Exceptions: Radios like the IC-726 and IC-729 already have these features built-in and do not require the UI-7. The "Collector's Story" RigPix Database - Accessories - Icom UI-7

Completeness: For collectors, having a "fully loaded" IC-725 with the UI-7 (and the UT-20 tone encoder) significantly increases the radio's versatility and value.