M700 Mods - Icom
If the front-panel 10-keypad is non-responsive for manual frequency entry, check the small toggle switch S1228 located on the Matrix board.
| Mod | Difficulty | Tools Needed | Benefit | |------|------------|--------------|---------| | MARS/CAP (full TX) | Medium | Soldering iron, diode cutter | Ham band transmit | | TX audio mod | Easy | Soldering iron, capacitor | Clearer voice | | CW filter add-on | Hard | Oscilloscope, filter, PCB | Weak signal CW | | Fan control | Easy | Resistor/thermal switch | Quiet operation | | PLL recap | Medium | Desoldering pump, caps | Reliable lock |
The Icom M700 is a "tank" of a radio. The most valuable modifications are not necessarily functional expansions, but : replacing the cooling fans, upgrading the backlighting to LEDs, and replacing aging electrolytic capacitors. Frequency expansion is possible but requires technical skill to maintain a clean signal. icom m700 mods
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, Go to product viewer dialog for this item.
: For digital modes like Sailmail or Winlink, you can add a dedicated interface lead. This typically involves tapping into the internal PTT, Line In, and Line Out lines to provide a DIN plug output for a Pactor modem. If the front-panel 10-keypad is non-responsive for manual
If you enjoy the smell of rosin flux and the satisfaction of pulling a weak signal out of the noise using a rig you hot-rodded yourself, buy an M700. Open it up. Perform these mods. And join the nets with a piece of radio history that now performs like a modern classic.
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. Frequency expansion is possible but requires technical skill
A central repository for M700 power and frequency unlock guides. Elliott Liggett's GitLab