Look for a row of small switching diodes (often labeled D1, D2, D3, etc.) arranged in a matrix pattern near the main microprocessor. The Modification:
The M700 is capable of 150W PEP, but the stock ALC circuit is aggressive. It tends to "grab" too early, causing flat-topping on voice peaks and muddy audio. icom m700 mods
To enable transmission on all covered frequencies (roughly 1.6 MHz to 23.9 MHz), ensure that jumper W37 (W1037) on the Logic Board is installed. If it has been cut, resoldering it restores full coverage. Look for a row of small switching diodes
Now fire up the soldering iron, download the IC-M700 service manual (available freely on Mods.dk), and give this marine dinosaur a new life on the air. 73. To enable transmission on all covered frequencies (roughly 1
Hm-180 8pin Microphone Speaker Mic For Icom Ic-m700 Ic-m710 Ic-m600
Modifying a marine radio for out-of-band transmit is for amateur radio or emergency use only. Operating on marine frequencies without a proper license or type-approved equipment is illegal.
: The radio supports both, but note that in some modes, the upper sideband features a carrier suppressed by 16 dB below peak power. Essential Reference Documents Service Manual