Icom M700 Mods -

Before you pick up a soldering iron, keep the following considerations in mind:

While modern maritime gear is often "black box" architecture—sealed, software-locked, and disposable—the M-700 is a relic of the golden age of radio. It uses discrete components, robust filters, and an architecture that invites modification.

Type the desired frequency in kilohertz (e.g., 1 4 2 5 0 for 14.250 MHz).

often requires modifications to be useful in an amateur radio context or to open up its full frequency range. Below is a comprehensive guide to the most common icom m700 mods

Here are brief guides for each mod:

For deep technical dives and step-by-step guides, refer to the IC-M700 Mods repository on GitLab or the extensive archive at Do you have a specific version

To allow programming of memory banks A and B (which are often factory-locked), ensure jumper W33 (W1033) is not installed. Before you pick up a soldering iron, keep

This guide provides a comprehensive look at the most popular and essential modifications for the Icom M700 series, ranging from unlocking general coverage and sidebands to adding interfaces for PACTOR and other digital modes.

: Modifying the transceiver to transmit outside the marine bands means the radio should only be used on amateur frequencies by a licensed amateur radio operator. It technically voids type-acceptance for commercial marine use under many jurisdictions.

Operators who have performed this adjustment report that a 212-watt output is achievable with no noticeable temperature increase in the PA section during normal operation. The radio remains stable for extended contacts. However, this should be considered a maximum rating—continuous high-power operation should be approached with caution, particularly for digital modes. often requires modifications to be useful in an

: To allow programming of memory banks A and B, ensure that jumper W33 (W1033) is not installed. If the 10-keypad is unresponsive, toggle switch S1228 on the Matrix board.

If it is cut, soldering it back together enables wide-band transmit.