OK so could not resist. The replacement of the HP 10811 with a PIEZO ocxo went very well. So in for a penny in for a pound. Why not an RB. Having a few around. Choice efratom FRS-c. Lot of thought went into this choice. Not really it was there. It has a inverse frequency to EFC voltage just like the piezo and opposite the HP 10811. Well it connects runs and locks using the simple 1 opamp level ofset and and phase inverter. But locked is a funny comment. According to HPsatstat and LH. Its pll is locked. But both scope and the LH graph shows a very slow frequency drift that with the offset I can make positive or negative. A cycle at 10 ns takes quite some time about an hour compared to a TBolt and another non modified Z3801. At this level of resolution some things start to become questionable.
I almost wonder if the modified z3801 under some level of drift assumes everything is locked and fine. Can it be pushed beyond expectations. I suspect it can. Anyhow as I say a bit of GPSDO fun. Regards Paul WB8TSL _______________________________________________ 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.
