Nokia Siemens 3G Flexi 2.1GHz to 2.4GHz 50W Amplifier Reverse Engineering (Part 3 of 3)

Circuit analysis, reverse-engineering and hacking of a Nokia Siemens Networks Flexi Multiradio base station FRGL amplifier. The user Da_Stier from made a deep circuit analysis of the power amplifier, reverse-engineered how it works, built new printed circuit boards to make it run standalone and built a new enclosure for it. Shifting its output frequency band from 2.1 GHz to 2.4 GHz, for us in HAM radio experiments.

Michael made a custom 3D printed RF enclosure and drop-in RF and power supply board using the original headers. He did S21 measurements before modifications and after modifications to determine the efficiency of the changed frequency.

Documentation, files and pictures

Documentation, board files, datasheets and Discussion of reverse-engineering:

All high resolution pictures is published with part 2 at:

Mads Barnkob

Electrician, programmer, experimenter and amateur scientist with experience in industry automation, programming and all kinds of high voltage generating electronics. Administrator of and the high voltage community forum

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