Icom M700: Mods __full__
The Icom IC-M700 is a classic marine HF transceiver that can be modified into a highly capable ham radio rig
. Below is a summary of the most common and effective modifications for this unit. Core Frequency & Programming Mods icom m700 mods
- Antenna, grounding, and installation optimizations (legal)
- Full Ham Band Coverage: To transmit on 160m, 80m, 40m, 20m, 15m, and 10m.
- Better Audio: The stock audio circuit is muddy for rag-chewing.
- Clarifier Alignment: For tuning in off-frequency digital modes (FT8, JS8) and SSB signals.
- Power Stability: Optimizing the 150W output without distortion.
- Ventilation: Ensure unit has good airflow; do not block rear ventilation. Install small, marine-grade fans if the unit is installed in an enclosed cabinet — fans must be quiet, low-vibration, and wired to operate only when necessary (thermostat or keyed ignition).
- Vibration isolation: Use vibration-damping mounting brackets or gaskets to reduce stress on connectors and PCBs on heavy-weather vessels.
- Conformal coating: If the radio is to operate in extremely humid or corrosive environments, consider professional rework to apply conformal coating to PCBs (voids warranty; only by qualified technician).
- Open the radio casing.
- Locate the "D" (Diode) matrix on the control board.
- Typically, cutting or adding a specific diode opens the transmitter to "General Coverage" (TX 1.6–30 MHz).
- Note: This varies heavily by the specific revision of the logic board. Consult the specific service manual for your serial number prefix.
- Integration with other systems (NMEA, AIS, DSC)
The final mod was the most heretical: a blue LED display. The original gas-discharge VFD had that perfect warm, minty turquoise glow of the 1980s. But it was dim and uneven. A kit from a hobbyist in Ukraine replaced it with a crisp, modern, ice-blue OLED. It was sacrilege. It was also gorgeous. The numbers now snapped into focus, bright and cold as a winter sky. The Icom IC-M700 is a classic marine HF