Icom M700 Mods [new] Direct

Comprehensive Guide: Icom M700 Mods

Note: This guide focuses on legitimate, safety-first, and legal modifications for the Icom IC-M700 (marine VHF fixed station) to improve usability, reliability, and integration. Do not perform modifications that violate local radio laws, FCC/ITU regulations, or that alter the unit’s certified transmission characteristics (e.g., increasing transmit power beyond spec, changing frequencies, or bypassing required emission limits). Always consult a certified radio technician or Icom for repairs that impact RF circuits or safety. Use this guide only for permitted hardware, ergonomic, and software/firmware tweaks that do not change certified RF parameters.

• 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.

• Mod: Tap into the CI-V bus on the logic unit (usually pin 5 and 6 of IC17). Add a 2.5mm stereo jack.
• Software: Use ICOM CI-V commands to control with Ham Radio Deluxe.

• Procedure: Requires a dummy load and a VTVM (Vacuum Tube Voltmeter) or oscilloscope to adjust the neutralization capacitor located near the tube sockets.

While the radio works well on amateur bands, it lacks the narrow filtering found in dedicated ham rigs, which may make it sensitive to nearby interference during contests. icom m700 mods