Some time ago bought one on Ebay for under $50 just because it looked interesting. It isn't a prototype but most of the FEI units probably had limited production. It seemed to be more complicated than I expected it to be but if I understood it better it would make more sense.
The 10Mhz board is enabled/disabled by the int/external switch. The 10Mhz output and EFC from this oscillator board are connected to the interface board. I believe that these 2 boards and the switch/connector on the back allow you to use the internal 10Mhz oscillator to output 10Mhz and send 10Mhz on (perhaps a connector marked J4) to a comparator board. If I recall this part of the unit should work independant of the other boards. The comparator board is probably a PLL that compares its 10Mhz input with its 100Mhz input and outputs an EFC voltage to the 100Mhz oscillator. the 100MHz oscillator output goes to the amplifier board with two 100Mhz outputs on the back panel. There is also a 100Mhz signal that goes back to the PLL board so the 100Mhz is locked to the 10Mhz oscillator or an external input (if I remember correctly). There are also other wires that control the light and other stuff but I didn't trace them out and my unit seems to work as intended. _______________________________________________ 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.
