: Modern operators frequently wire a digital Direct Digital Synthesis (DDS) VFO chip (like the AD9850 or AD9851) directly into the first local oscillator (LO) injection port.
: Modifying the transceiver to transmit outside the marine bands means the radio should only be used on amateur frequencies by a licensed amateur radio operator. It technically voids type-acceptance for commercial marine use under many jurisdictions.
Which specific version do you have? (The with the thumbwheel/keyboard, or the M700PRO ?)
After modification, a typical M700PRO will transmit and receive on all amateur bands up to 22.999 MHz, though the original IC-M700 cannot transmit above 22.999 MHz even after modification. icom m700 mods
Many M700 units are found without their original 6-pin power plugs. Standard mods include hardwiring power leads or adapting more common high-current connectors to ensure the radio gets the stable DC voltage it needs to hit its 150W peak output. Critical Resources for M700 Mods
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Serious operators desolder the stock Murata ceramic filter and install a sharper crystal filter (such as a 2.4 kHz or 2.1 kHz filter). This drastically improves receiver selectivity during crowded contesting or weak-signal operations. 3. Adding an External VFO or Frequency Control : Modern operators frequently wire a digital Direct
For detailed technical documentation on modifying the Icom IC-M700
To enable general coverage transmit on standard M700 models, clipping or removing specific diodes alters the logic matrix. For standard international versions, removing Diode D15 (or cutting its lead) frequently unlocks wide-band transmit.
Look for a row of small switching diodes (often labeled D1, D2, D3, etc.) near the microprocessor. Which specific version do you have
When opening your IC-M700 for modifications, perform these preventative maintenance steps to ensure long-term reliability:
Given the IC-M700 was released in the mid-1980s, basic restoration is often the best "mod":