The most popular modification for the Kenwood TKM707 expands its transmit capabilities outside standard marine allocations. This allows operation across all amateur radio HF bands. The Diode Matrix Modification
The Kenwood TKM707 is a legendary dual-band FM mobile transceiver known for its "tank-like" build quality and excellent audio. While it is an older unit, several popular modifications can modernize its functionality or expand its capabilities. 🔓 Frequency Expansion (Mars/Cap Mod)
: The rear of the unit can get warm during long transmissions. Adding an external fan to the rear heatsink is highly recommended for 150W operation. Source ⚠️ Important Technical Notes kenwood tkm707 mods
“Loud and clear, Starbound ,” Jack said. “What the hell did you do?”
Requires removing a specific zero-ohm resistor (jumper) on the control board. Procedure: Disconnect power and remove the top/bottom covers. Locate the control unit (behind the front panel). Find the small surface-mount jumpers labeled W1, W2, etc. Removing W1 typically opens the transmit range. The most popular modification for the Kenwood TKM707
relies heavily on channel-ized operation, letting users scroll through memory banks rather than freely dial through a band. Unlocking the true VFO mod transforms how the front panel tuning dial behaves:
Contains the full circuit descriptions and PLL block diagrams. User Manual & Installation Guide (Scribd) While it is an older unit, several popular
+-------------------------------------------------------------------+ | KENWOOD TKM-707 SYSTEM OPTIMIZATION | +-------------------------------------------------------------------+ | | | [Antenna System] <---> [AT-300 / MAT-100 Tuner] <---> [TKM-707] | | ^ | | | (Solid RF Strap) | | v | | [Copper Ground Plane] | | | +-------------------------------------------------------------------+ Antenna and Tuner Alignment Articles for Kenwood 'TKM-707' - Mods.dk
If you own an older unit, you may notice the LCD display is dim or has "spiderweb" cracks in the black background. This is a common aging issue with LCDs from the 90s.
Then nothing but the ocean and the stars.
The Kenwood TKM-707 is a legendary transceiver in the amateur radio community. Known affectionately as the "Commercial Grade" mobile rig, this 2-meter radio has developed a cult following due to its robust receiver front end, simple interface, and rock-solid transmit audio. Originally designed for the commercial land mobile market, many of these radios have found their way into the hands of amateur radio operators.
