Icom M700 Mods Page

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

To enable general coverage transmit on standard M700 models, clipping or removing specific diodes alters the logic matrix. For standard international versions, removing Diode D15 (or cutting its lead) frequently unlocks wide-band transmit.

: Look for a row of small switching diodes (usually labeled in the component schematic near the microprocessor).

The M700's audio can be quite narrow, optimized for voice communication, which is great for SSB but less ideal for listening to broadcast radio. icom m700 mods

Transmitting outside authorized marine bands requires a valid amateur radio license (Ham radio) or specific experimental permits.

If banks A and B are locked out from programming, ensure jumper W33 (W1033) on the Logic Board is not installed Keypad Activation:

: The IC-M700 is a type-accepted marine radio. Modifying the internal circuitry generally voids its type-acceptance. Furthermore, transmitting on frequencies outside of the designated marine bands requires specific licensing (such as an Amateur Radio license) and must comply with local laws regarding equipment standards. Early production runs of the IC-M700 suffered from

Before modifying your radio, note that the IC-M700 has several variants, including the original M700, the M700PRO, and the M700TY. This guide focuses primarily on the classic, fully discrete IC-M700.

The Icom IC-M700 is a legendary commercial marine SSB transceiver. Built like a tank, it features an exceptionally robust final amplifier stage, a heavy-duty chassis, and a powerful 150-watt transmitter. However, because it was designed strictly for marine band operations under commercial regulations, its factory configuration limits its utility for modern amateur radio operator (ham radio) and long-distance cruisers.

The M700 runs warm. Inspect the final power amplifier section and the voltage regulators for cracked or cold solder joints, reflowing them with fresh solder. : Look for a row of small switching

Here is a quick reference guide to answer the most common questions about the Icom M700 series:

What (like a dummy load or power meter) do you have available? Share public link

These modifications require precise soldering skills and basic knowledge of electronics. Proceed at your own risk. 🔓 1. General Coverage Transmit Mod (Frequency Expansion)