Yaesu XF-130CN
The FT-DX10 is already equipped with three roofing filters with widths of 12, 3, and 0.5 kHz. The optional 300 Hz CW filter provides even better selectivity in situations of very high band usage, for example in a contest or a pile-up. Installation is trouble-free and can be easily carried out by the user; it is plug and play, with no soldering required.