Requires a custom daughterboard or significant soldering to the logic unit. 3. Audio & Microphone Upgrades
The stock M700 does not always feature a fine-tuning knob (Receiver Incremental Tuning) accessible from the front panel.
By default, the M700 is often locked to specific marine channels. Modifications can enable "wide-band" transmit, allowing the radio to operate on amateur HF bands.
: The original HM-28 microphone is often replaced with the modern HM-114 . Note that this requires replacing the internal connector (53) on the MIC-C-UNIT board. icom m700 mods
Tap into the AF Out pin on the rear external speaker jack or accessory plug for clean receive audio. Tap into the Mic Input pin for transmit audio.
The Ultimate Guide to Icom IC-M700 Mods: Unlocking Marine HF Power Icom IC-M700 Go to product viewer dialog for this item.
Are you planning to use the M700 for or are you looking to set it up for digital data modes like Winlink? IC-M700 Mods - Elliott Liggett - GitLab Requires a custom daughterboard or significant soldering to
Find the matrix of small switching diodes (usually labeled in the service manual schematic as the programming matrix).
Since the M700 uses a non-standard microphone connector (often 7 or 8-pin), users frequently build interface boxes. These boxes bridge the radio’s Mic/PTT and Speaker outputs to a Pactor modem or a computer sound card for digital modes like FT8 or JS8Call.
: Coverage can be extended into the 10-meter and 11-meter bands (above 24 MHz) by editing the internal SRAM contents and manually retuning the VCO. Keyboard Restoration By default, the M700 is often locked to
: External kits, such as the Palomar Engineers RFI Kit , use ferrite chokes on the DC power and antenna lines to reduce the noise floor and suppress interference. Reference Resources
Modifying the Icom IC-M700 (and the newer M700PRO) is a common practice among amateur radio enthusiasts who want to adapt this robust marine SSB transceiver for ham radio use. Because it was originally designed for the marine environment, it lacks several standard "ham" features like a VFO dial and certain operating modes, which these modifications aim to restore. Core Ham Radio Modifications