The IC-M700 is built for communications audio, which means its default filters are optimized for cutting through marine atmospheric noise rather than high-fidelity amateur operation. Microphone Gain and Compression
Note: The up/down buttons on the HM-114 will not function after this mod. IC-M700 Mods - Elliott Liggett - GitLab
Consulting the original service manual for specific circuit diagrams. icom m700 mods
That was the M700’s secret shame. A fiercely powerful 150-watt transmitter mated to a receiver that was, by modern standards, a little polite. A little broad. On a crowded band, it heard everything at once: Havana, Reykjavik, some guy in Ohio selling air compressors, all bleeding together like wet watercolors.
: Internal controls like R19 on the RF board and R247 on the Main board can be used to adjust the tuning power output (standard is 10W) to better match external antenna tuners. Maintenance for Aging Units The IC-M700 is built for communications audio, which
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:
After clipping the correct diode, ensure the clipped leads cannot touch any other components, reassemble the case, and perform a master CPU reset if required. The radio will now transmit anywhere it can receive. 2. Clarifier / RIT Modification That was the M700’s secret shame
Here are brief guides for each mod:
With a simple TTL-to-RS232 adapter, you can control frequency via PC.