The Icom UI-7 is an essential internal expansion board designed for vintage Icom transceivers, most notably the and Icom IC-728 . While these radios often feature "AM/FM" buttons on their front panels by default, they require this specific unit to enable actual transmission in AM and both transmission and reception in FM. Core Functions and Capabilities
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Because the UI-7 has been out of production for decades, finding one requires a bit of detective work. Your best bets are: Icom IC-725 The Icom UI-7 is an essential
: This unit is highly sought after by operators who want to use FM on the 10-meter band (29.6 MHz), which is popular during high sunspot cycles. Power Adjustment but do expect solid communication quality.
When you engage the AM or FM mode with the UI-7, don't expect the "high-fidelity" of a commercial broadcast station, but do expect solid communication quality.