Icom M700 Mods -

Because the M700 is a high-power unit (150W), it generates significant heat during extended periods of transmission. Integrating an external cooling solution, such as a high-airflow fan directed at the rear heat sink, helps maintain stable operating temperatures and protects internal components from thermal stress.

However, the rise of digital modes (FT8, Pactor, Winlink) and the needs of cruisers necessitated a change.

Early production runs of the IC-M700 suffered from slight frequency drift when the radio warmed up. Clarifier (RIT) Installation

Pinouts at the microphone connector offer a workaround: icom m700 mods

The internal CMOS memory is backed up by a CR2032 or similar lithium coin cell. If this battery dies, the radio will lose its programmed channels. Install a coin-cell holder for easy future replacements.

With proper planning, the right documentation, and careful execution, an M700 can become the cornerstone of a versatile and powerful amateur radio station—often at a fraction of the cost of comparable ham-specific equipment.

The stock fan only runs when the PA gets very hot. For long rag-chews, this is insufficient. Fix: Locate the thermistor (temperature sensor) on the PA heat sink. Desolder one leg and insert a 100-ohm resistor in parallel. This will make the fan turn on at a lower temperature and run continuously at low speed (or install a manual toggle switch on the rear panel to run the fan at half speed during transmit). Because the M700 is a high-power unit (150W),

Eli wasn't a spy. He wasn’t a prepper or a pirate. He was a late-night AM DXer, a hunter of ghosts in the static. He’d bought the M700 at a maritime flea market in Rotterdam for two hundred euros, its grey paint chipped, the "CH" button worn smooth. The seller, a grizzled tugboat captain, had called it "indestructible, and just as deaf."

Ensure jumper W37 (marked "W1037") is installed. If it is cut, solder it back together to enable all-frequency transmission.

The Icom IC-M700 is a classic marine SSB transceiver that is highly popular for amateur (Ham) radio conversion. Modifying it typically involves , expanding memory , and improving audio for non-marine use. 📻 Core Modifications for Ham Radio Early production runs of the IC-M700 suffered from

: The stock radio is limited to 48 channels. Specialized mods, such as an SRAM expansion , can increase this capacity to 480 channels.

: A large collection of various Icom-specific hacks can be found in the All ICOM Mods from Mods.dk or more detailed step-by-step instructions for the SRAM memory expansion? Old HF Marine radio for Ham Radio: IC-M700 : r/HamRadio

The M700’s fan is loud and often runs continuously.