Tkm-707 Mods - Kenwood
Beyond modifications, maintaining the efficiency of this vintage unit often involves standard electronic repairs.
(marine version) are less commonly documented in general manuals than its dual-band cousins like the TM-G707, standard Kenwood MARS mods for this platform typically involve the located behind the front panel.
This guide should equip you with the knowledge to unlock the full potential of your Kenwood TKM-707. Remember to proceed with caution, respect the law, and enjoy the process of transforming this marine radio into a powerful amateur radio station. Kenwood Tkm-707 Mods
: Delivers a full 150 watts PEP for long-distance marine and HF communication.
can suffer from "cold" solder joints that cause intermittent reception or power loss. Resoldering the main PCB and Molex connectors is a standard reliability upgrade. Remember to proceed with caution, respect the law,
| Feature | Modification Type | How to Achieve | Result | | :--- | :--- | :--- | :--- | | | Hardware | Clip Diode D312, D313, D314 | Transmit on LSB, USB, and AM across wider frequency range, including ham bands. | | Activate VFO Mode | Hardware + Key Combo | Clip Diode D313, then press C + 84 ENT | Switch from channelized operation to continuous frequency tuning. | | Configure for Ham Use | Hardware | Set DIP switches S301-1: OFF, -2: OFF, -3: ON, -4: ON | Enables full ham band operation with dealer mode and US destination. | | CPU Reset (Clear Memory) | Key Combo | C + Power On | Clears all stored memory channels and performs a full reset. | | CPU Reset (Keep Memory) | Key Combo | ENT + Power On | Resets the CPU but retains programmed memory channels. | | Adjust Power Output | Hardware/Alignment | Internal realignment via service manual. | Potentially boost output from 150W to 180-200W PEP. | | Enable/Disable Key Beeps | Key Combo | C+80 ENT or C+81 ENT | Turn confirmation tones on or off for silent operation. |
A common issue reported in older units is the radio getting , causing the "TX" indicator to lock up and rendering the receiver useless. Correcting the PTT Switching Loop Resoldering the main PCB and Molex connectors is
Kenwood TKM-707 is a ruggedized Marine SSB radiotelephone often repurposed by ham radio operators for HF band use. Modifications for this unit typically focus on expanding its frequency range to allow transmission on amateur bands or adjusting internal audio and beep settings. Common Modifications
By default, the TKM-707 has a wide-open receiver capable of scanning , but its transmitter is strictly factory-restricted to designated marine bands. Expanding the transmitter to allow continuous coverage (ideal for Ham Radio bands or MARS/CAP operations) requires a hardware jumper change on the main Control Unit . Step-by-Step Procedure:
A successful modification journey relies heavily on good information. Here are the most valuable resources for the TKM-707: