The receiver uses a de-emphasis circuit (a simple RC filter) that kills treble. By changing a few capacitor values, you can get a much flatter, more pleasant audio response.
Description: NEW HM-180 replace old model EM-101 Hand Microphone For IC-M700 IC-M710 IC-M700PRO IC-M600 (equal EM-48 or HS-50 mic, Let's MOD the Icom IC-9700 for Big Jim!
For detailed schematics and step-by-step instructions, these repositories and sites are frequently cited by the community: icom m700 mods
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: A large collection of various Icom-specific hacks can be found in the All ICOM Mods from Mods.dk or more detailed step-by-step instructions for the SRAM memory expansion? Old HF Marine radio for Ham Radio: IC-M700 : r/HamRadio The receiver uses a de-emphasis circuit (a simple
Beyond the major modifications, M700 owners have explored other tweaks.
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: Can’t copy the link right now
The most sought-after is the full frequency unlock. Without this, you are limited to marine channelized operation. With it, you get continuous TX from 1.6 MHz to 30 MHz, covering all amateur bands.
: Locate the Main Unit or local oscillator board. Increasing the voltage swing across the tuning pot by altering the series resistors gives you much finer control over incoming, drifted signals. 3. Adding an External VFO Control
For the , the modification often requires removing a zero-ohm jumper resistor or cutting a specific wire loop labeled "TX Frequency Lock."