This is the most common modification. It allows the radio to transmit outside the standard amateur bands.

features 198 memory channels (including 150 factory-programmable and 62 user-programmable), advanced users often mod the unit to allow for more flexible VFO (Variable Frequency Oscillator) tuning similar to a standard ham radio Hardware & Connectivity Mods kenwood tkm707 mods

Procedure:

The TKM-707 is frequently modified to operate on frequencies outside its original marine bands. The Kenwood TKM-707 Go to product viewer dialog

automatic antenna tuner. Modifications to the tuner interface cable can allow it to work with modern third-party tuners like SGC or Icom-compatible units. Audio Quality

Part 1: The Essential Mod – Frequency Expansion (MARS/CAP)

The most common search leading to “kenwood tkm707 mods” is the need to open the TX/RX frequency range. By default, the TKM-707 transmits only on ITU marine channels. For amateur bands (160m, 80m, 40m, 30m, 20m, 17m, 15m, 12m, 10m) and MARS/CAP frequencies, you need to perform a simple diode mod. Audio Quality Part 1: The Essential Mod –

Note: Some units need a 4.9152 MHz crystal swap for proper LSB filter alignment. Rare but possible.

💡 Pro Tip: If you are using this for CB frequencies, ensure you use a high-quality 50-ohm coaxial cable like RG-8U to handle the 150W output safely.