Kenwood Tkm-707 Mods !!hot!! -

[Antenna] ---> [IF Stage (Upgrade Mechanical Filter)] ---> [Audio Amp (Change Caps)] ---> [Speaker] SSB Filter Upgrades

The TKM-707 has a reputation for slightly muffled receive audio due to aggressive IF filtering meant for noisy boats. The transmit audio is fantastic (the Kenwood "warmth" is there), but you can make it better.

: Replace the faulty switching transistor with an upgraded, higher-amperage surface-mount component to prevent future thermal failures. Audio and Microphone Audio Line Optimization Kenwood Tkm-707 Mods

: Similar to other Kenwood units like the DG-1, the

Ultimate Guide to Kenwood TKM-707 Modifications The Kenwood TKM-707 is a legendary HF marine transceiver known for its commercial-grade build quality and reliable performance. While originally designed for marine SSB frequencies, amateur radio operators and shortwave enthusiasts frequently modify this radio to expand its capabilities. Direct Frequency Entry and Transmit Expansion [Antenna] ---> [IF Stage (Upgrade Mechanical Filter)] --->

: Adjusts the ALARM tone level during the Alarm Test mode.

The Kenwood TKM-707 is a well-known marine transceiver often discussed in the radio community for its durability and design. Many operators explore modifications to tailor the device's performance for specific environments or expanded use. General Areas of Modification Interest Frequency Range and Transmission Audio and Microphone Audio Line Optimization : Similar

The most sought-after modifications for the TKM-707 fall into a few key categories: enabling VFO (Variable Frequency Oscillator) mode, expanding transmit frequency coverage (MARS/CAP), and adjusting power output.

Owners often seek to optimize transmit power. The stock TKM-707 is rated at 150W PEP, but with age, its power output may drift. Anecdotal reports suggest that with proper realignment, the TKM-707 can easily reach 180-200W PEP. Additionally, adjusting the microphone's internal amplification circuit is recommended to improve transmit audio quality, ensuring clear and punchy modulation. These adjustments require a service manual and basic test equipment.

: While the TKM-707 is a single-piece unit, some users adapt its mounting brackets or utilize third-party external speakers (via the 4Ω external jack) to improve ergonomics in tight shack spaces or vehicle cabins. Technical Specifications for Modding Current Requirement 30A at 13.6V DC for full 150W output Standard RX Range 500 kHz to 30 MHz (General Coverage) Standard TX Range 2 MHz to 30 MHz (Marine Bands) Output Power High (150W), Medium (50W), Low (25W)

Increase average talk power.