Kenwood Tkm-707 Mods ((full)) -

Disclaimer: Modifying this radio may violate terms of service for marine band use, void legal certification, and require an amateur radio license. Incorrect modifications can damage the final amplifier. Proceed at your own risk.

2. Most Requested Modifications

2.1. Frequency Expansion (TX beyond marine bands)

Goal: Enable transmit on amateur HF bands (e.g., 80m, 40m, 20m). Kenwood Tkm-707 Mods

  1. Digital Signal Processing (DSP): Install a DSP module to improve noise reduction, filtering, and overall reception.
  2. TCXO (Temperature-Compensated Crystal Oscillator): Upgrade to a TCXO for improved frequency stability and accuracy.
  3. Sensitivity and Selectivity Upgrades: Enhance your radio's sensitivity and selectivity with upgraded components.
  4. Amplifier Upgrades: Install a power amplifier or preamplifier for increased transmission power or improved reception.

Final Call: After performing your mods, always test into a dummy load first. Never modify for 11m (CB) operation—it’s illegal, and the radio will bleed harmonics across entire bands. Keep it clean, keep it ham, and enjoy the sleeper classic. Disclaimer: Modifying this radio may violate terms of

Unlocking the Potential: Essential Mods for the Kenwood TKM-707

The Kenwood TKM-707 is a legend. Built like a tank for the marine market, it has found a second life in the shacks of amateur radio operators who crave a rugged, high-performance HF transceiver. Why? Because it shares DNA with the famous Kenwood TS-450, but you can often pick one up for a fraction of the price. Digital Signal Processing (DSP) : Install a DSP

: Hosts clear PDF copies of the instruction and service manuals for reference during hardware adjustments. Repeater Builder® Common Modification Categories

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

  • Apply only one mod at a time (or predefine combinations), documenting exact component values and placement with photos.
  • Re-run the full measurement battery after each mod.

Part 5: Audio Mods – Punching Through the QRM

The stock TKM-707 has decent audio, but it’s optimized for narrow marine voice (2.4 kHz). Hams prefer a slightly richer transmit audio profile.