| 词条 | Yaesu FT-221 |
| 释义 |
The Yaesu FT-221 is a modular VHF 2M all mode (SSB, AM, CW and FM) amateur radio transceiver, built by the Yaesu Corporation in Japan during the 1970s. Technical description
The frequency is set by a 500 kHz range VFO being mixed with the product of a number of crystals and is displayed using a rotary display dial. 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.[2] One such replacement is the mutek replacement front end[3] 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 variantsThe FT221R is a model with repeater shift. The FT221RD also has a digital display. References1. ^http://pdf.textfiles.com/manuals/SCANNERS-S-Z/Yaesu-FT-221%20Instruction%20Manual.pdf Yaesu FT-221 Instruction manual 2. ^http://www.radiomods.co.nz/yaesu/yaesuft221.html Modifications for the Yaesu FT-221 3. ^http://www.ssbusa.com/mutek.html mutek replacement front end External links
1 : Amateur radio transceivers |
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