With these modifications, you transform a limited-purpose marine radio into a genuine HF contesting, DXing, and emergency communications asset. The M700 will never have a spectrum scope, but it will be working long after cheaper rigs have died.
Why? Because beneath its utilitarian grey faceplate lies a 150-watt, bulletproof HF transceiver with a receiver that rivals modern mid-tier rigs. However, the M700 has a secret: it is artificially restricted . To turn this marine radio into a true amateur powerhouse, you need to perform a series of well-documented, time-tested modifications. icom m700 mods
The audio path uses small-value capacitors that roll off frequencies below 300 Hz. This kills bass response, making your receive audio sound "tinny." With these modifications