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![SDR interface for the FT-991 from TSP S.r.l. www.tspelettronica.com](https://i2.wp.com/www.tspelettronica.com/wp/wp-content/uploads/2019/03/Diapositiva47.png)
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FT-991 Hardware Upgrade Kit - AD5GG
![Yaesu Md 100 Wiring Diagram : TH_9468 Power Supply Schematic Diagram](https://i2.wp.com/worldwidedx.com/data/photos/l/3/3967-1458781471-0fd26bd4875945700ef884ebaabfa83e.jpg)
Yaesu Md 100 Wiring Diagram : TH_9468 Power Supply Schematic Diagram
![il Radioamatore: Yaesu FT-991](https://i2.wp.com/42460e4d06aa03bee98d-196c53d60dd8027754ef96352b4703ae.r22.cf2.rackcdn.com/original/ZYS-FT-991-0002.jpg)
il Radioamatore: Yaesu FT-991
![YAESU FT991A Multiband transmitter HF / VHF / UHF 1.8 - 54 Mhz 144/430 Mhz](https://i2.wp.com/www.locuradigital.com/images_upload/4991_07_2.jpg)
YAESU FT991A Multiband transmitter HF / VHF / UHF 1.8 - 54 Mhz 144/430 Mhz
![Yaesu FT-991A Receiver Front End Failure](https://i2.wp.com/www.commswg.site/img/_articles/FT991A/Yaesu_FT-991_Schematic.png)
Yaesu FT-991A Receiver Front End Failure
![Yaesu FT-991 Manual - The DXZone.com](https://i2.wp.com/www.dxzone.com/dx30486/yaesu-ft-991-manual.jpg)
Yaesu FT-991 Manual - The DXZone.com
Yaesu FT-991: HF-VHF-UHF All mode - hamradioweb.org