I recently came across a thread on this list about undocumented FE5680 commands. I have been using a little linux command line tool I wrote years ago for tuning the unit and decided to add these commands to it. Since this mailing list was the place I found the unit (someone linked to an ebay seller) I figured I' d join the list and throw it on here :) http://www.tomwimmenhove.com/otherstuff/fe5680-0.2.tgz
Now, the bad news. I had my unit running overnight while logging the serial command output that reads the ADC, and in the morning it was no longer locked. The 10MHz signal disappears about 5 seconds after power-on, and programmed offset was somehow reset to zero (it had been set to -645). So it appears as if the internal EEPROM has been corrupted. I read a post from Elio Corbolante where he posted EEPROM and firmware dumps. Anyone have any idea on how to re-write this firmware back into the EEPROM by hand (would this be possible through JTAG, or do I actually have to solder the chip out of there? :) ) Or maybe there's someone willing to sell their broken unit I could take the chip out of? Regards, Tom _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
