> The actual FRS-C is quite a bit cleaner but still nowhere near as good as > the Thunderbolt. > > Also worth noting is that the Datum's output is quite a bit > noisier than it > was several months ago when I measured it with (very) different > hardware. I > wouldn't take the green trace in this graph to the bank until I've had a > chance to repro that earlier measurement. Still, either way, it's > definitely much noisier than the Thunderbolt.
My mistake - there's no meaningful difference, it's within 2 dB of my earlier measurement on the 11729C. I think I was confusing that trace with the FSC-C rubidum measured by itself, which is good for a floor between -135 and -140 dBc/Hz. -- john, KE5FX _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
