Crystal FilterYF-100/YF-101XF-455K-251-01The 500-Hz YF-100 or 250-Hz XF-455K-251-01 crystal filter may be installedin the FT-890 for CW narrow reception,and the YF-101 2.6-kHz crystal filtermay be installed for improved SSB and AM narrow receiver selectivity.The pro-cedure involves removing the bottom cover,and requires a low-wattage solder-ing iron.Proper performance with the crystal filters dependson proper install-ation.If you are unsure of the procedures after reading the following,fell freeto ask your Yaesu dealer for help.
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