fwiw, looks like the spectradynamics patent expired today: https://patents.google.com/patent/US6278330B1/en afaik that design (more or less) is also described in https://doi.org/10.1109/FREQ.1998.717932 a variation is also https://doi.org/10.1109/EFTF.2012.6502322 (which might be sold by http://www.skk.it/index.htm - but that website is a bit spartan..) (if anyone knows more micro-stepper papers, please post!)
my plan is to present our DIY version of this, an open hardware design, at EFTF2020. we have two AD9912:s clocked at 1GHz (derived from the maser) producing two LO's that drive a mixer-board that locks an OCXO that feeds a PICDIV. Anders > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.