Kenwood Tkm-707 Mods -

: To remove all factory TX lock limits, look for the configuration jumpers/zero-ohm chip resistors or surface-mount switching diodes labeled in the configuration matrix.

: Modifications to maritime radio equipment can violate FCC or international regulations. Always ensure you are licensed for the frequencies you intend to use. Detailed schematic-level mods for this specific model are often hosted on enthusiast sites like mods.dk .

Last updated: 2025 (based on reverse engineering by VK3HZ, N6WS, and JA1HBS). Kenwood Tkm-707 Mods

By default, the TKM-707 is locked to marine SSB frequencies (approx. 1.6–27.5 MHz). It won't let you transmit on 80m, 40m, or 20m without a fight.

If you want, I can convert this into a step-by-step workshop guide for performing each mod (with example schematics and a suggested parts list). : To remove all factory TX lock limits,

The Kenwood TKM-707 is a 150W HF SSB transceiver (RX: 0.5–30 MHz, TX: 1.6–27.5 MHz marine bands). Despite its commercial focus, amateur operators have developed several modifications to expand frequency coverage, improve performance, or enable external control.

adjustments, which are essential for amateur radio communication but may be restricted or less intuitive on marine-specific hardware. MARS/CAP Modifications Detailed schematic-level mods for this specific model are

Adding an external cooling fan is one of the most effective ways to protect the final power transistors.