HM-180 8Pin Microphone Speaker Mic for ICOM IC-M700 IC-M710 IC-M600 Radio | Made in China | Clip
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. icom m700 mods
: 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. HM-180 8Pin Microphone Speaker Mic for ICOM IC-M700
: Available on the Icom Japan Support site, this is necessary for identifying board locations like the Logic and Matrix boards mentioned above. IC-M700 Mods - Elliott Liggett - GitLab On a crowded band, it heard everything at
Operators often open the radio to allow LSB (Lower Sideband) operation. While rarely used for voice at sea, LSB is critical for amateur digital protocols.
Given the IC-M700 was released in the mid-1980s, basic restoration is often the best "mod":
The most fundamental modification is enabling the radio to transmit outside of its factory-set marine bands (MARS/CAP and Amateur Radio expansion). Transmit Enable Jumper