Icom M700 Mods !link! [ 2027 ]

Comprehensive Guide: Icom M700 Mods

soldering diagrams

I can provide more specific for the original model or keypad programming codes for the PRO version if you can confirm which one is on your desk. Old HF Marine radio for Ham Radio: IC-M700 : r/HamRadio

1. The Cooling Fan Mod:

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). icom m700 mods

The Icom M700 remains a reliable and effective marine VHF radio, and modifying it can enhance its performance, functionality, and user experience. However, it's essential to carefully consider the benefits and risks of any mod, ensuring that you're making informed decisions about your radio and onboard systems. If you're unsure about any aspect of the modification process, consult with a qualified technician or Icom support specialist to ensure a successful outcome. Comprehensive Guide: Icom M700 Mods soldering diagrams I

restoration

The Icom IC-M700 (and its variant the IC-M700TY) is a legacy HF marine transceiver. While robust, it is an older analog radio. Most modifications performed today fall into two categories: (bringing the radio back to spec) and expansion (enabling HAM band usage or replacing obsolete components). For long rag-chews, this is insufficient

MARS/CAP Expansion

: To enable transmit across the entire covered range (roughly 1.6 MHz to 23 MHz), ensure jumper W37 (W1037) on the Logic Board is installed.

Why? Because beneath its utilitarian grey faceplate lies a 150-watt, bulletproof HF transceiver with a receiver that rivals modern mid-tier rigs. However, the M700 has a secret: it is artificially restricted . To turn this marine radio into a true amateur powerhouse, you need to perform a series of well-documented, time-tested modifications.

Before diving into soldering irons and jumper wires, let's understand the "why." The Icom M700 was designed for the marine service (ITU channels). Out of the box, it covers 1.6–30 MHz in transmit, but only on marine SSB frequencies. Most hams want: