Final answer:
The optional active-tuning antenna system for the Yaesu FT-DX10 is the Yaesu FC-40 automatic antenna tuner, which aids in remote tuning of wire antennas for various frequency bands.
Step-by-step explanation:
The active-tuning antenna system that is optional for use with the Yaesu FT-DX10 is the Yaesu FC-40 automatic antenna tuner. This device is designed to provide remote automatic tuning for a wide range of wire antennas, often simplifying the setup for users who need to operate over various frequency bands. The FC-40 is particularly useful for those who are setting up portable stations or have space constraints that prevent the installation of large, multiple antennas.
It is important to assess your specific needs and the frequencies you plan to operate on before deciding to purchase this additional equipment. The Yaesu FT-DX10 transceiver is designed for amateur radio enthusiasts, and the addition of a compatible antenna tuner like the FC-40 can enhance the experience by ensuring the antenna system is resonant on the desired frequencies, effectively reducing SWR (Standing Wave Ratio) and maximizing the efficiency of power transfer from the transceiver to the antenna.