One of the most common complaints regarding the TKM-707 is its aggressive squelch behavior. Commercial radios are designed to be silent until a very strong signal arrives. For amateur use, where we often listen to weaker signals or marginal propagation, the stock squelch can be too tight, causing the beginning of transmissions to be cut off.
: Features 198 memory channels, including 136 preprogrammed ITU channels and 62 user-programmable channels.
TX from 1.6–30 MHz continuous (subject to hardware limits).
typically comes pre-programmed for specific marine ITU channels . To enable general coverage transmission or "out-of-band" capabilities: Kenwood Tkm-707 Mods
Desolder the VCO shield cover, clean it thoroughly with an abrasive brush, treat it with an anti-corrosion barrier, and resolder it firmly to the ground plane.
typically focus on expanding its capabilities for non-marine or emergency use. Note: Performing these may void warranties or violate FCC regulations.
Out of the box, the TKM-707 is often locked to specific commercial frequencies. For the amateur radio operator, the most critical modification is opening up the transmit and receive range to cover the entire 2-meter band (144–148 MHz). One of the most common complaints regarding the
Modifications can void the device's certification (such as FCC or CE ratings). It is the operator's responsibility to ensure that the equipment continues to meet technical standards regarding spectral purity and harmonic emissions after any modification.
Improve frequency stability.
As noted in technical documentation such as that found on fracassi.net , radios of this era may develop cold solder connections. Inspecting and resoldering the main PCB, particularly around voltage regulators, is a standard maintenance practice. : Features 198 memory channels, including 136 preprogrammed
A temperature-controlled soldering iron with a fine-tip chisel bit. Anti-static wrist strap and grounding mat. Rosin-core solder and desoldering braid. A Philips #2 screwdriver. Step-by-Step Procedure Kenwood TKM-707 Marine Transceiver - Mods.dk
The front panel is not intuitive for hams. Download the "Kenwood TKM-707 Ham Translation Sheet" (easily found via Google). It maps "CH" to VFO and "Scan" to memory recall. Once you learn the logic, it’s a joy to use.