Icom M700 Mods [verified] -
The Icom IC-M700 is a classic marine HF transceiver that has become a popular project for amateur radio enthusiasts due to its robust build and low second-hand cost. While originally locked to marine bands, several modifications can unlock its full potential for ham radio use. Core Functionality Modifications
To enable programming of banks A and B (which are often locked out), ensure jumper W33 (W1033) on the Logic Board is not installed.
Mods.dk - IC-M700 Section: The most comprehensive archive for specific hardware jumper settings and legacy repair articles. icom m700 mods
The Icom IC-M700 is a classic marine SSB transceiver that is highly popular for amateur (Ham) radio conversion. Modifying it typically involves unlocking transmit frequencies, expanding memory, and improving audio for non-marine use. 📻 Core Modifications for Ham Radio
SRAM Expansion: The standard 48-channel memory can be expanded to 480 channels via an SRAM expansion mod, making it more practical for storing numerous amateur bands and nets. Mode & Audio Upgrades: The Icom IC-M700 is a classic marine HF
Disclaimer: Modifying electronic equipment requires soldering skills, knowledge of high-voltage circuits (the M700 has lethal voltages inside), and proper test equipment. The author assumes no liability for damage to your radio, your vessel, or your person. Proceed at your own risk.
LSB/USB Mode Switching: Most marine HF communication is USB only. For lower ham bands (like 40m or 80m), LSB is the standard. Mods often involve adding a toggle switch or internal circuitry to flip the sideband. Technical and Connectivity Mods Hum in the audio
- Hum in the audio.
- Low transmit power.
- Instability in the frequency synthesizer.
Most M700s are software or hardware limited to marine bands. Here’s how to open them.