However, the TKM-707 came out of the box with maritime restrictions. To make it sing on the ham bands, you need to perform a few key modifications.
If you're comfortable with more complex modifications, consider these upgrades: Kenwood Tkm-707 Mods
TX from 1.6–30 MHz continuous (subject to hardware limits). However, the TKM-707 came out of the box
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. Kenwood Tkm-707 Mods