| Mode | Transmit Power (UI-7 Installed) | |------|-------------------------------| | AM | 10-40W (IC-725/728) / 1-4W (IC-721S) | | FM | 10-100W (IC-725/728) / 1-10W (IC-721S) | | SSB | 10-100W (IC-725/728) | | CW | 10-100W (IC-725/728) |
The UI-7 was designed to pair flawlessly with Icom’s Black Box systems, most notably the and the IC-M400BB . In these setups, the main transceiver is hidden away in a dry, secure location (e.g., a nav station or equipment locker), while one or more UI-7 units are placed at the helm, flybridge, or lower control station.
For months the radio had been little more than a legend. Fishermen whispered of its uncanny clarity — how it could pull a distant station out of the fog and make voices sound as if the speakers were a window into another place. Some said it remembered the names of ships. Others swore it kept a ledger of storms. No one could say why it mattered, only that, in a town where weather decided days and tides decided livelihoods, the radio’s words could be a comfort in a way that none of the modern devices were.
There is no standard market price for the UI-7, as it is a vintage part. Its value is dictated by its rarity and condition. As a general rule, expect to pay a premium for a confirmed working unit compared to a "for parts or not working" listing. The best deals often come from private sellers who are unfamiliar with the specific value of the board, but it is essential to ask for photos of the board's pins and connectors to check for damage or corrosion. icom ui-7 am fm unit
The Icom UI-7 is an optional internal plug-in module designed primarily for Icom’s line of VHF/UHF base stations and receivers from the late 1980s and early 1990s.
While many vintage rigs can approximate AM reception using Single Sideband (SSB) modes, true AM demodulation via the UI-7 provides a warmer, more natural audio profile. It reduces the precise tuning drift often associated with tuning AM stations on SSB, making long-distance international broadcasting much more enjoyable to listen to. 2. Local FM Monitoring
To assign the function:
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.
In most cases, installation involves simply seating the board into the designated socket and securing it with a screw.
When the sunspot cycle is high, 10-meter FM repeaters (usually found between 29.5 and 29.7 MHz) allow for incredible long-distance communication with very low power. Without a UI-7 installed, an IC-725 is "blind" to these repeaters. | Mode | Transmit Power (UI-7 Installed) |
Enables AM transmission (standard radios usually only received AM without it). FM Support: Provides both FM transmission and reception . Compatibility and Rarity
It enables high-quality squelch for FM, crucial for monitoring quiet bands without hearing constant background noise.
Users looking for parts for the do not need this module, as AM/FM support is integrated from the factory. Fishermen whispered of its uncanny clarity — how