Kenwood | Tkm707 Mods =link=
's capabilities beyond its factory-set marine channels. Detailed schematics and procedures for these modifications can be found in the archives at mods.dk Frequency Expansion:
: Tuning this ensures proper suppression of the carrier signal during SSB operation, eliminating unwanted background hum on your transmission.
If you want, I can:
Poor reception and erratic transmit behavior on the TKM-707 are almost always caused by inadequate grounding. If using this modified unit as a base station or on a vessel: kenwood tkm707 mods
Modifying a marine VHF/HF transceiver to transmit on non-marine frequencies alters its type-acceptance status. Ensure you hold a valid Amateur Radio License (General Class or higher in the US) before transmitting on amateur HF bands. Always operate within the legal power limits and spectral boundaries mandated by your local telecommunications authority.
To operate legally and clear-voice on 40m and 80m ham bands, operators utilize two common modification strategies:
Modifying a marine transceiver to transmit on non-marine frequencies carries responsibilities. 's capabilities beyond its factory-set marine channels
This is akin to taking off the training wheels and is the first step toward using the radio for amateur radio and general shortwave listening (SWL).
This setup is not plug-and-play, but it’s a fun weekend project that can get a classic radio on the air in the 21st century.
Many users connect a high-quality external communications speaker to the rear jack for better clarity. If using this modified unit as a base
has a large cooling system capable of continuous full-power transmission for over an hour, adding external fans to the rear aluminum chassis is a common mod for digital mode enthusiasts (like FT8) who require heavy duty cycles Essential Technical Resources
Adding a small, silent DC cooling fan to the rear heat sink is a common modification to ensure longevity.
: Beep tone levels ( VR7 ) and alarm tone levels ( VR6 ) can be adjusted internally after removing the top cover. ssb radiotelephone - tkm-707 - Manuals (Repeater Builder)
