After modifying the diodes, perform a full CPU reset by holding the A=B or Clear button while turning the power switch on. Firmware and Frequency Resolution Enhancements
The most sought-after modification for the TKM-707 is the one that unlocks its transmit capability across the entire HF spectrum, commonly called the "MARS/CAP" (Military Affiliate Radio System/Civil Air Patrol) mod. This mod allows the radio to transmit on frequencies outside its marine allocation, making it usable on amateur bands. Kenwood Tkm-707 Mods