Icom Ui-7 Am Fm Unit _top_ Online

is an essential optional plug-in board for vintage amateur radio enthusiasts, specifically those owning the Icom IC-725 transceiver

. While most modern radios come fully loaded, this specialized unit was the key to unlocking broader communication capabilities in the late 1980s and early 90s. What is the Icom UI-7? The UI-7 is a mode-expansion unit designed to add AM transmission FM transmission/reception

to the IC-725. Without this board, the IC-725 is largely restricted to SSB and CW operations. Although the front panel of every IC-725 includes an "AM/FM" button, the button serves no functional purpose for transmitting in those modes unless the UI-7 is physically installed inside the chassis. Key Technical Details Compatibility: Specifically designed for the Icom IC-725 . It is notably not required

for the IC-726, which already includes these modes as standard. Functionality: Enables AM (Amplitude Modulation) transmit capabilities.

Enables FM (Frequency Modulation) transmit and receive capabilities. Installation:

It is an internal plug-in board. Installation typically involves routing wires (often referred to as jumper wires) to specific pins on the front panel board (e.g., Jumper 5 and 6). Why You Might Need One Today

If you are a collector or a "ham" operator using a legacy IC-725, finding a UI-7 is the only way to: Access 10-Meter FM:

Participate in FM repeaters or simplex operations on the 10-meter band. Join AM Nets:

Engage in the "warm," nostalgic audio of the AM community on HF bands. Complete Your Rig: Many enthusiasts seek these units on secondary markets like to fully "max out" their vintage equipment. Maintenance & Performance Tips The "Mega Bass" Fix:

Some users have noted that the IC-725's AM detector (which shares circuitry with the IC-R70 receiver

) can have clipped audio due to impedance mismatches. Technical hobbyists often "hot-rod" these units by adding resistors (like a 3.3k ohm) to improve the audio response. Indicator Check:

If you push the AM/FM button and see the mode change on the display but get no output power during transmission, it is a definitive sign that the UI-7 unit is missing or incorrectly installed. wiring diagram to help you put a UI-7 into your IC-725?

The Icom UI-7 AM/FM Unit is an internal plug-in module designed to expand the operational capabilities of specific Icom HF transceivers, most notably the Icom IC-725, IC-726, and IC-728/729.

While these radios often feature "AM/FM" buttons on the front panel by default, they frequently lack the necessary internal circuitry to actually transmit in these modes or receive FM signals without this optional board. 📻 Core Functionality

Mode Expansion: Enables FM transmission and reception, allowing users to access 10-meter FM repeaters and simplex frequencies.

Transmission Support: Specifically enables AM transmission. Without this unit, many compatible radios can receive AM broadcasts but cannot transmit in AM mode.

Squelch Integration: Activates the squelch function for FM mode, which is essential for quiet monitoring of frequencies when no signal is present. 🛠️ Key Specifications

Compatibility: Designed for the "7-series" entry-level HF rigs, including the IC-725, IC-726, IC-728, and IC-729.

Installation Type: Internal plug-in board. It typically requires opening the transceiver's case and connecting multi-pin jumpers to the main logic or RF boards.

Operating Voltage: Powered directly by the transceiver's internal 13.8V DC rail. 🔌 Installation Overview

The UI-7 is generally considered a user-installable option, though it requires basic comfort with internal radio components:

Access: Remove the top and bottom covers of the transceiver.

Mounting: The unit typically mounts to a specific area on the main or front-panel board using provided screws or standoffs.

Wiring: Connect the short and long jumper wires (often labeled for specific pins like J21 and J22) as specified in the radio's instruction manual.

Verification: Once installed, the "AM/FM" button on the front panel will cycle through the modes, and the radio will successfully key up in these modes.

💡 Quick Tip: If you are buying a used IC-725 or IC-728, always check if the UI-7 is already installed. Many operators consider it a "must-have" for full utility, and finding the standalone module today can be difficult as they are no longer in production. If you'd like, I can help you with:

Finding a PDF of the specific installation diagrams for your radio model.

Identifying alternative modes or filters (like the FL-100/101) for your rig.

Troubleshooting common issues after installation, such as low AM drive or FM squelch problems.

Icom UI-7 AM/FM Unit an optional internal expansion board designed for the Icom IC-725 HF transceivers

. Without this unit, these radios are limited to Single Sideband (SSB) and Continuous Wave (CW) for transmission, though the front panel often includes a non-functional AM/FM button. Functionality icom ui-7 am fm unit

The UI-7 unit adds full communication capabilities to the radio: : Enables the transmission of and both the transmission and reception of Power Output

: Extends the general coverage receiver (30 kHz to 33 MHz) to include FM signals. Installation & Compatibility

The unit is a plug-in board that installs into the bottom of the radio. Compatible Models : Icom IC-725, IC-721, IC-723, and IC-728. Pre-Installed Models : The UI-7 is not required

for the Icom IC-726 or IC-729, as these models include AM/FM functionality by default. Installation Process

: It requires connecting specific cables to internal ports (typically J21 and J22) and a brown jumper wire to the front panel. Legacy and Availability Manufactured

: In Japan during the late 1980s and early 1990s; it has since been discontinued. Secondary Market

: Because it was an optional add-on, it is now a sought-after accessory for vintage radio collectors. Used units often appear on sites like or through specialized shops like Radioworld UK Further Exploration Learn how to install the unit with this UI-7 Installation Tutorial from a community radio hobbyist. View the technical circuit specifications in the Icom IC-725 Service Manual Check current availability for this vintage component on installation guide for a specific radio model? RigPix Database - Accessories - Icom UI-7

Here’s a forum-style post you can use or adapt for a discussion board, Facebook group, or Reddit (e.g., r/amateurradio).

Title: Just got an Icom UI-7 – any AM/FM tips or tricks?

Body:

Just picked up an Icom UI-7 AM/FM unit. I know these are getting harder to find, so I’m pretty excited to add it to the shack.

For those who’ve used one:

• How’s the AM RX performance compared to something like a R75 or a basic portable?
• Any common issues (display dimming, audio pops, etc.) I should check first?
• What antenna are you running for AM broadcast vs. FM?

Also – I’ve seen conflicting info: does the UI-7 handle FM broadcast stereo properly through the line out, or is it mono only?

Appreciate any real-world feedback. Thanks!

If you meant something else (e.g., a sales ad, troubleshooting, or a review), just let me know and I’ll rewrite it.

The Icom UI-7 AM/FM Unit is an internal, optional plug-in board designed for older Icom HF transceivers. Its primary function is to enable AM transmission and FM transmission/reception capabilities that are otherwise disabled in the base radio. 📻 Core Purpose

While many Icom radios from the late 1980s and early 1990s have an "AM/FM" button on the front panel, the circuitry to actually process these modes was often sold as an add-on. Without the UI-7: The front panel button may switch the display mode. The radio will not transmit in AM or FM. FM reception will not function. Key Specifications

Function: Adds AM (transmit) and FM (transmit/receive) modes. Power Output (on IC-725): AM: ~40 watts. FM: ~100 watts. Origin: Manufactured in Japan. 🔌 Compatibility

The UI-7 is most commonly associated with the Icom IC-725 (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

Note: The UI-7 is not required for the IC-726 or IC-729, as those models already included these modes as standard features. 🛠️ Installation Basics

Installing the UI-7 requires opening the radio's case and plugging the board into the bottom section.

Physical Mounting: The board typically plugs into a dedicated socket on the main or PLL unit. Wiring Connections:

It uses specific jumper wires (often labeled J21 and J22) to connect the unit to the radio's processing stages.

A separate brown wire often connects to the front panel (jumper J5) to enable the button logic.

Space Concerns: The unit is designed to fit under a plastic/foam shield inside the radio's grill area. 💡 Why Install One Today?

10-Meter FM: Allows you to use FM repeaters on the 10-meter band (29.6 MHz), which is popular during high sunspot cycles.

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

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.

The Icom UI-7 AM/FM Unit is a classic "hidden gem" for amateur radio enthusiasts who own vintage Icom transceivers like the IC-725, IC-721, or IC-728.

For many operators, this small plug-in board was the final piece of the puzzle, transforming a standard HF rig into a more versatile "all-mode" station. Here is what makes it interesting: The Missing Link is an essential optional plug-in board for vintage

If you’ve ever pressed the "AM/FM" button on an Icom IC-725 and nothing happened, it’s because the UI-7 wasn't installed. This unit was an optional upgrade that officially unlocked the radio's ability to: Transmit in AM mode (usually at 10–40 watts).

Transmit and Receive in FM mode (up to 100 watts), perfect for 10-meter repeaters. A Piece of Radio History

Manufactured in Japan during the late 80s and early 90s, the UI-7 is now a sought-after collectible on the second-hand market. Since these units are long discontinued, finding one in good condition often requires scouring specialized sites like Radioworld UK or auction platforms like eBay. DIY Modernization

Installing the unit is a satisfying project for ham hobbyists. It requires opening the radio's case and plugging the board into specific internal locations (like connectors J21 and J22). Once installed, it allows the radio to support additional accessories like the UT-30 Tone Encoder, which is necessary for triggering modern repeaters.

is an optional internal plug-in board designed for older Icom HF transceivers, such as the Icom IC-725 Icom IC-728 The standout "solid feature" of this unit is that it enables AM transmit and FM transmit/receive capabilities that are otherwise non-functional on these radios. Key Capabilities of the UI-7 Enables Missing Modes

: Without this board, the AM/FM buttons on your radio's front panel will not work for those specific modes. 10-Meter FM Repeater Use

: When paired with an optional tone encoder (like the UT-20), the UI-7 allows you to operate on 10-meter FM repeaters Full Power FM : Once installed, it typically allows for 100 watts of output on FM and roughly 40 watts on AM (depending on the specific radio model). Plug-and-Play Design

: It is a small add-on board that plugs directly into the bottom of the radio's chassis, often requiring only a few internal cable connections to the existing front panel and main logic units. Applicable Radios

The UI-7 is confirmed to be compatible with the following Icom models: Icom IC-725 Icom IC-728 (including M and S variants) Universal Radio : This unit is not required Icom IC-726

, as those models have these modes built-in from the factory. Universal Radio Are you planning to a UI-7 in an IC-725, or are you looking for troubleshooting tips for an existing unit? RigPix Database - Accessories - Icom UI-7

The Icom UI-7 is an optional plug-in expansion board primarily designed for older Icom HF transceivers, such as the Icom IC-725 and Icom IC-728. Its purpose is to add AM transmit and FM transmit/receive capabilities to radios that originally only support SSB and CW modes. Key Functions

AM Transmit: Enables the radio to transmit in AM mode (usually 25 watts of carrier power).

FM Capability: Adds the ability to both transmit and receive FM signals, typically used on the 10-meter band (28–29.7 MHz).

Expansion: Allows these entry-level rigs to participate in AM nets or local FM repeater activity on HF bands. Compatibility

While specifically listed for certain models, its compatibility varies:

Required for: Icom IC-725, IC-728, and IC-737 to gain full mode access.

Not Needed for: The Icom IC-729, which has these modes built-in from the factory. Installation Overview

Installing the unit generally requires opening the radio's top or bottom covers:

Mounting: The board is secured to a designated location on the main chassis. Connections:

It connects to the main unit via a 10-pin plug and two 3-pin plugs.

Wiring: A specific brown wire is often required to connect the to the front unit. Specifications Modes Added AM (TX), FM (TX/RX) Sensitivity (FM) 0.5 µV for 12 dB SINAD (on 28 MHz band) Design Internal plug-in PCB Manufacture Made in Japan; now discontinued RigPix Database - Accessories - Icom UI-7

On a salt-streaked harbor where gulls argued like old friends, a small repair shop leaned into the wind between a lighthouse and a row of weathered boats. Its glass door had a sticker that read RADIO REPAIRS — in letters long since sun-bleached — and inside, amid soldering irons and coils of coaxial cable, sat an object that had once been the heart of a thousand voyages: an Icom UI-7 AM/FM unit.

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.

Maya ran the shop. She had grown up on this pier, hands hardened from nets and small mechanical miracles. She’d inherited the business from her grandfather, who used to hum sea shanties while polishing brass knobs. When the UI-7 arrived, wrapped in an oilcloth and strapped with frayed rope, it had a handwritten note tucked beneath it: "From Elias. For when you can't hear the horizon." The handwriting slanted like a captain’s signature and smelled faintly of salt and lemon oil.

The unit was older than Maya’s memory but not old enough to be relic. Its faceplate bore the soft patina of daily use: the AM/FM switch was polished to a satin by fingers that had tuned it for storms, for birthdays, for long nights when two boats at sea exchanged cliffside secrets. She could have sold it to a collector for more money than she’d see in a year, but she didn’t. Instead she set it on the workbench and began the slow, meticulous work of bringing it back to life.

First she cleaned the contacts, coaxed the stiff tuning dial with a little heat and a lot of patience, replaced a capacitor that had swollen like a tired heart, and traced microfractures in the wiring beneath the chassis. Each small repair was a conversation — a bristling of old solder and the soft chime of metal that obeyed. At night, when the shop was quiet, she would sit under the lamp and let the radio rest beside her like an old companion.

On a Thursday in late autumn, a storm rolled in—sharp, quick, the kind that comes with rumors of change. The sea turned the color of pewter coins, and the sky filled with the hiss of rain. Boats pulled in early; fishermen tied lines with fingers practiced by generations. Power flickered and then died. Candles blinked to life in windows along the harbor, and the town settled into a hush that felt like a held breath.

Maya reached for the UI-7 and flipped the switch. At first, nothing but the low, comforting hiss of static. She turned the dial slowly, listening to the way the noise shifted—the same way a sailor reads the wind. Then, like a memory finding its voice, a station surfaced: a crackly male voice reading an old shipping forecast. The words were half-lost but coherent enough to say what everyone at the docks needed to know: a trough moving from the northwest, winds to gale near the cape, seas running short and confused.

The fishermen nodded at their doors. They might have had smartphones and satellite radios, but there was something in the way the UI-7 carried that forecast — clarity wrapped in familiarity — that felt like a map drawn by a hand that knew the coastline’s secrets. Boats that had hesitated in the moorings put out taut lines instead. A few captains stayed; others went out carefully, less to challenge the storm than to keep promises to nets and family meals.

That night the storm did what storms do — it tested ropes and patience, bent masts and spirits, and took one small skiff that tried to hide from it among the rocks. When dawn came, it revealed both damage and grace. The skiff had torn free of its moorings, but its crew clung to a buoy and were plucked from the water by a neighbor who had seen their signal flare. In the harbor the town counted the day’s losses and breathed over the ones they hadn’t yet learned. Title: Just got an Icom UI-7 – any AM/FM tips or tricks

Word of the UI-7’s forecast spread. People began to bring their radios to Maya, not because she could fix everything — she couldn’t — but because the machine made people feel seen, as if the harbor itself had been given a voice. An old captain left a thermos and a story about beating a storm off Cape Verde; a teenage apprentice from the shipyard asked how a capacitor could look tired and what that said about other things, like people.

One evening, an elderly woman came into the shop holding a tin of biscuits. Her hair had been silver as gull foam and her hands trembled like wind through reeds. She introduced herself as Ida — Elias’s sister. When she set the tin on the bench, Maya saw, inside the clasp, a faded photograph of a younger Elias smiling with his arm around a radio very much like the UI-7. Ida told Maya that Elias had been a radio operator before he became a fisherman, and that radio and sea had been the threads of his life. "He used to say," she murmured, "that sound remembers. That if you listen hard enough, the radio will tell you the stories you ought to hear."

Maya tuned the UI-7 to a local station. Through static and music, a caller read a note about a local sailor’s 50 years at sea. The voice on the air was small and alive, like a candle flame under a glass. Ida listened until her eyes turned the color of some old shore, and then, finally, she smiled. "He’d have liked that," she said.

News of the radio’s uncanny reception reached further than the harbor. Artists painted it, children wrote stories where the UI-7 was a lighthouse in disguise, and a local librarian cataloged every call sign that the machine had pulled from the airwaves. The shop became a quiet pilgrimage spot: not a museum, not a monument, but a place where people brought their small failures and left with a bit more weathered hope.

One winter evening—when frost had rimed the gutters and the town’s breath rose like ghosts—Maya received a letter without a return address. Inside was a small map and a single sentence in handwriting that looked very like the note on the oilcloth: "Listen at midnight." Beneath it, a time and a coordinate that pointed to a lonely buoy two miles offshore.

At midnight, in a lamplit shop wrapped in the hush of sleeping houses, Maya tuned the UI-7 to the frequency on the map. For a while there was nothing but the old static, the kind that sits like silt over the channel. Then, faint as a thread, a voice rose — not a weather report this time, but a story: a croaking baritone telling of a summer when a radio crackled and somehow saved a child from the undertow. It was a story about a small act of kindness, about a borrowed lamp, and a lighthouse keeper who read a bankrupt letter aloud. It was Elias's voice, unmistakable in its cadence, telling a story like a lit match in the dark.

Maya felt a hollow in her chest settle into something warm. The voice told no directions, no secrets; it told a story about listening. When it ended, it left the shop filled with a feeling like the salt on your lips after a long day at sea. There was no more transmission. The signal faded, as if the sea had swallowed the radio waves whole.

She searched records and logs, asked radio operators, and scoured the harbor’s memory. No one could find a scheduled broadcast that matched what she had heard. The map, the phrase, the voice—all led to a quiet kind of certainty that some things are shared to be kept, not catalogued.

Years passed. The UI-7 lived its days on the bench and in the window, sometimes silent, sometimes spilling music that made people remember what they’d almost forgotten: who they were when the lights failed, how small towns withstand enormous weather, how kindness travels on frequencies that don’t answer to meters or apps.

When Maya grew older she trained a new repairer, then another, teaching them to listen more than they spoke. The radio outlived its first owners, then its second. New devices came with brighter screens and promises of perfect reception, but they could not imitate the way the UI-7 fit into the town the way a good harbor fits a ship: snug, enduring, and full of old stories.

On an evening in spring, with the air smelling of wet wood and dandelion, a young child pressed her nose to the shop window and watched the radio’s tuning dial spin slowly. Maya opened the door to him and, without ceremony, placed an old oilcloth-wrapped radio in his small palms. Under the cloth was a note in a hand that had loosened with time: "For when you can't hear the horizon."

"Listen," Maya said. He did. Somewhere beyond the harbor, across distances measured not only in miles but in memory, the UI-7 exhaled a static that was almost like a greeting. The boy's eyes widened. He could not yet name the stations; he did not yet know the weather patterns. But he understood the gift: that certain machines are conduits for more than signal—that they hold the patience of people, the kindness of strangers, the steady insistence that someone, somewhere, was telling a story.

And so the Icom UI-7 continued, not as a wonder to be boxed and sold, but as a living thing on a bench by the sea — a workbench heart that tuned itself to the town’s rhythms, translating storms into warnings, loneliness into song, and static into stories that outlasted even the sea.

Introduction

The Icom UI-7 is a compact, single-board amateur radio transceiver module that operates on both AM and FM frequencies. It is designed for use in various applications, including handheld radios, mobile radios, and repeater systems. The UI-7 is a highly integrated module that includes a receiver, transmitter, and control circuitry, making it an ideal solution for manufacturers and hobbyists looking to build or upgrade their amateur radio equipment.

Key Features

Here are some of the key features of the Icom UI-7 AM/FM unit:

1. Frequency Range: The UI-7 operates on a frequency range of 136-174 MHz (VHF) and 400-470 MHz (UHF), making it suitable for use in various amateur radio bands.
2. Modes: The module supports both AM and FM modes, allowing for voice communication and digital data transmission.
3. Receiver Sensitivity: The UI-7 has a high receiver sensitivity of 0.35 μV (typical) for FM and 2.0 μV (typical) for AM, ensuring reliable reception of weak signals.
4. Transmitter Power: The module has a transmitter power output of up to 5 watts ( adjustable), making it suitable for use in handheld and mobile radios.
5. Digital Signal Processing: The UI-7 features digital signal processing (DSP) technology, which provides improved noise reduction and audio quality.
6. CTCSS and DCS: The module supports Continuous Tone-Coded Squelch System (CTCSS) and Digital Coded Squelch (DCS) features, allowing for selective calling and squelching.

Technical Specifications

Here are the technical specifications of the Icom UI-7 AM/FM unit:

• Frequency Range: 136-174 MHz (VHF), 400-470 MHz (UHF)
• Modes: AM, FM
• Receiver Sensitivity: 0.35 μV (FM), 2.0 μV (AM)
• Transmitter Power Output: 5 watts (adjustable)
• DSP: Yes
• CTCSS/DCS: Yes
• Operating Voltage: 3.6-5.5 VDC
• Current Consumption: 30 mA (receive), 500 mA (transmit)
• Dimensions: 24.5 x 17.5 x 3.5 mm (L x W x H)

Applications

The Icom UI-7 AM/FM unit is suitable for various applications, including:

1. Handheld Radios: The UI-7 can be used to build or upgrade handheld radios for amateur radio use.
2. Mobile Radios: The module can be integrated into mobile radios for use in vehicles or fixed installations.
3. Repeater Systems: The UI-7 can be used in repeater systems to provide reliable and high-quality voice and data communication.
4. Experimental Projects: Hobbyists and experimenters can use the UI-7 as a building block for various amateur radio projects and prototypes.

Conclusion

The Icom UI-7 AM/FM unit is a highly integrated and versatile module that offers a range of features and capabilities for amateur radio communication. Its compact size, low power consumption, and high performance make it an attractive solution for manufacturers and hobbyists looking to build or upgrade their amateur radio equipment. Whether you're building a handheld radio, mobile radio, or repeater system, the Icom UI-7 is definitely worth considering.

It is highly likely you are referring to one of two things:

1. The Icom UT-106: This is a very famous AM/FM controller unit used in older Icom marine VHF radios (like the M1, M3, and M11 handhelds). It is a small internal module that enables AM/FM radio reception.
2. The Icom IC-7300: This is a modern HF radio, and the number is close to "UI-7."

Given that you specified "AM FM unit," I am proceeding with a review of the Icom UT-106 AM/FM Controller Unit, which is the internal module that adds broadcast radio reception to marine handhelds.

Key Specifications (as per Icom)

| Feature | Details | |---------|---------| | Frequency coverage (AM) | 0.5 – 1.705 MHz (broadcast band) | | Frequency coverage (FM) | 76 – 108 MHz (Japan & world FM band) | | Demodulation | AM (narrow) for broadcast; WFM (wide FM) for stereo | | Antenna | Uses IC-705’s BNC antenna connector (shared) | | Power | Drawn from IC-705’s internal battery or external DC | | Installation | Internal, requires opening radio, moderate DIY skill |

Problem: "Squelch doesn't work on VHF"

• Note: The UI-7 controls squelch for the main transceiver. If the handset’s squelch knob seems unresponsive, the main transceiver may be in "sunlight mode" or a priority scan mode that overrides manual settings.

AM Broadcast (0.5–1.7 MHz)

• Sensitivity: Very good for a transceiver add-on. On a 1m whip antenna (stock IC-705), you’ll hear strong local stations clearly. With a proper external AM loop or long wire, sensitivity matches dedicated portables like a Tecsun PL-330.
• Selectivity: Fixed, around ±6 kHz. This is fine for strong signals, but adjacent-channel rejection (e.g., 10 kHz spacing) is poor compared to a dedicated DX radio. You will hear bleed-over from nearby strong stations.
• Audio quality: Restored to built-in speaker or headphones. It’s clean but not Hi-Fi – about 3–5 kHz bandwidth, typical of an amateur radio’s audio path. Not for critical music listening.

What Makes It Good?

• Integration: The best feature of the UT-106 is how seamlessly it integrates with the host radio. You do not need a separate device. Once installed, you simply switch the radio to the "AIR" or "FM" mode (depending on the host model), and you use the radio's volume and squelch knobs to control the broadcast reception.
• Audio Quality: Because it relies on the host radio's large speaker (and often the waterproof housing), the audio quality for FM radio is surprisingly robust and loud—much louder than a standard smartphone or small handheld transistor radio. This is great for listening to music or news while on a boat deck.
• Power Efficiency: It utilizes the host radio’s massive battery pack. Standard marine handhelds have high-capacity batteries, meaning you can listen to the radio for hours without worrying about draining your phone or a smaller radio.
• Simplicity: It is a plug-and-play module. There is no software to install; it usually just requires unscrewing a cap on the back of the radio, inserting the chip, and screwing the cap back on.

Review: Icom UT-106 AM/FM Controller Unit

The Verdict: A nostalgic "must-have" for owners of vintage Icom marine handhelds, but effectively obsolete for modern users.

The UT-106 is not a standalone radio; it is a small circuit board module designed to be inserted into specific Icom marine VHF handheld transceivers (such as the Icom M1, M1V, M3, and M11). Its purpose is simple: it allows the user to listen to commercial AM and FM broadcast radio stations while out on the water.

Where to Buy and Pricing

As a premium OEM component, the Icom UI-7 is sold through marine electronics dealers (West Marine, Defender, Hodges Marine) and online at specialty retailers like Amazon (via authorized sellers).

Approximate Price Range: $300 – $450 USD (depending on cable and mounting kit inclusions). Note: This does not include the main IC-M605 or IC-M400BB transceiver, which typically retails for $500–$800.

What’s in the box:

• UI-7 Handset
• Mounting cradle with flush-mount or bracket-mount options
• 5-meter connection cable (varies by SKU)
• Instruction manual
• Dust cover

The Downsides

• Specific Compatibility: This is the biggest drawback. It fits a very specific list of older Icom radios (mostly models from the late 90s and early 2000s). If you have a modern Icom radio (like the M36, M73, or M93), this unit will not fit or function.
• No Stereo: The output is mono. Since it plays through the handheld's single speaker, you do not get stereo separation for FM music. For talk radio or news, this is fine, but for music, it lacks the depth of stereo headphones.
• Antenna Limitation: It uses the VHF antenna attached to the radio. VHF antennas are tuned for ~156 MHz (marine band). FM broadcast is ~88-108 MHz. While it works, the reception sensitivity is not as good as a dedicated radio with a properly tuned telescopic antenna. You might get static in fringe areas.
• Availability: Since this is an accessory for older radios, it is now considered "Legacy" or "Discontinued." Finding a new one is difficult and usually requires buying second-hand or "New Old Stock" (NOS) on eBay.

5. External Speaker and PA Capability

The UI-7 can drive an external speaker (4–8 ohms) for higher audio output in noisy engine rooms or open cockpits. Furthermore, when connected to a compatible Icom transceiver, it supports a Public Address (PA) function, allowing the helmsman to use an external hailer horn.