The top of the case is removed by opening 4 quick release fasteners, revealing a number of user adjustable trimmers and pots. The modular design of the FT-221, where removable circuit boards allowed radio hams to modify their FT-221 either by replacing specific components or even replacing the whole board. One such replacement is the mutek replacement front end board which improved the front-end sensitivity. The open format of the internal construction also allowed the transmit and receive cables to be brought outside the case to use a low-noise coaxial relay.
Other model variants
- http://pdf.textfiles.com/manuals/SCANNERS-S-Z/Yaesu-FT-221%20Instruction%20Manual.pdf Yaesu FT-221 Instruction manual
- http://www.radiomods.co.nz/yaesu/yaesuft221.html Modifications for the Yaesu FT-221
- http://www.ssbusa.com/mutek.html mutek replacement front end
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