Here are some photos showing the procedure to install the optional filters (and a few
showing off the color display), TXCO-9 and DSP-2 to the Yaesu FT-857 rig. There's nothing hard about installing any of these modifications. The instructions in the Yaesu manual are fairly comprehensive and the menu options to select them are easy to get right.
Make sure to get the filters and TXCO-9 round the right way. As with it's big brother, the
FT-897, it's worth noting that the FT-857 optional filters are labeled with different part numbers than are on the boxes they come in! The YF-122S is marked XF-119SN and the YF-122CN is marked XF-119CN.
The schematic of the FT-857 is almost identical to the FT-897. Both rigs support the ATAS-100 and ATAS-120 antennas with every option you can think of for diplexer/separate antenna use. Please email me if you have any questions or comments. Click on any of the pictures to see it in full detail. Hover your mouse over the pictures to see my comments on it.