Kenwood Tkm-707 Mods Official

: For marine use, ensure the 50-ohm antenna system is grounded to a copper strip. Inadequate grounding is a common cause of poor reception and RF interference on this model. Internal Level Adjustments :

The is a legendary marine transceiver, revered for its ruggedness and reliability in harsh maritime environments . While designed specifically for marine VHF communication, many ham radio operators and boating enthusiasts often look into modifications (mods) to expand its functionality or improve performance for amateur use.

Increase PEP output beyond 150W.

Remove the top and bottom covers of the radio to locate the digital control unit. Kenwood Tkm-707 Mods

: A massive rear heatsink protects the unit during prolonged high-power operation. Ensure at least 15 cm of clearance behind the radio chassis to prevent thermal throttling. The MARS/CAP and Open HF Transmit Mod The most sought-after alteration for the Go to product viewer dialog for this item.

When modifying your Kenwood TK-M707, be aware of the following:

: Modifying a surface-mount technology (SMT) radio requires intermediate to advanced electronics skills. You risk destroying the logic board without proper tools. : For marine use, ensure the 50-ohm antenna

: Note that the TKM-707 is frequently confused with the VHF/UHF dual-band TM-G707 mobile radio in digital discussion threads. Ensure you are referencing the specialized Kenwood TKM-707 / TRC-70 schematics on Mods.dk rather than the TM-G707 layout before lifting components. 2. Audio Processing Mods: Clarifier & Microphone Gain

Add the "FM Broadcast" mod. By lifting one leg of R101 (near the mic amp) and inserting a 1k resistor, you flatten the transmit frequency response for a fuller, richer SSB signal.

PA transistors (2SC2879, etc.) are easily destroyed above 180–200W. Not recommended. : A massive rear heatsink protects the unit

The Kenwood TKM-707 is a legendary HF marine transceiver known for its rugged build and reliable performance. While designed primarily for marine SSB communications, amateur radio operators and radio enthusiasts have long sought to modify this radio. Modifications can unlock amateur bands, improve audio quality, and add modern functionality.

Enable transmit on amateur HF bands (e.g., 80m, 40m, 20m).

These modifications are intended for licensed amateur radio operators only. Transmitting out of band is illegal and can result in hefty fines. Proceed at your own risk.

: Adjust VR7 to change the volume of the confirmation beeps.

: Most technical modifications for this series involve hardware changes to the control unit or the removal of specific diodes/resistors to bypass factory frequency locks. MARS/CAP Modification