Not being a time nut but a frequency nut I lack some of the time test equipment, but my partner on our joint development work makes up for it. So he among other things recently looked at the 1 pps output of the Tbolt against a Cesium. Using a HP 5352A with 500 samples over 50% are within +- 300 psec and all within +-1 nsec. It makes an excellent GPS receiver and the 10 MHz out make a good reference for counters, spectrum analyser and Signal Generators. Good place to start, specially because of all the software available. Any significant improvement on it should be well thought out and lower A/V products are hard to find and seldom cheap. Bert Kehren On Fri, Sep 7, 2012 at 11:34 AM, Robert Liesenfeld <xu...@xunil.net> wrote: > Hello- > > My name is Robert Liesenfeld, I discovered this mailing list via the > fascinating website leapsecond.com. I'm an amateur radio operator (AK6L) > and builder, and my interest in precise timekeeping initially stemmed from > simply wanting a very accurate clock source to which I could reference my > test equipment (counter, spectrum analyzer, etc), but has expanded to a > desire to perform timekeeping experiments. I have several questions; I > looked for a FAQ but couldn't find one, so I hope it's alright to ask here. > > I'm considering the purchase of a GPS receiver to serve as my workbench > 10MHz source. Since learning about precise timekeeping, I've also become > interested in some experiments, such as measuring the stability of the > mains, the effect of the ionosphere on WWV/WWVH signals, and so on. So far > I've looked at various HP "Z-boxes" (Z3816, Z3815, Z3801, Z3805) and the > Trimble Thunderbolt receiver. All of these seem to be in the $200-$500 > range I'm targeting, but it's not clear what the differences are. I've > read the Thunderbolt is an older design with fewer channels, but I don't > know if that's really a problem for my intended use. > > I've also seen many rubidium devices on eBay, most seem to have been > removed from CDMA cell tower service. Does anyone here have any experience > with such devices, are the ex-cell-tower units any good? I have read that > a rubidium standard's short-term stability is not as good as a GPSDO, and > that they're mainly used for holdover - is my understanding correct? My > thought is to (eventually) use a rubidium device to stabilize a GPSDO > should the receiver lose satellite signal. > > Thank you in advance for any advice! > > -Robert > _______________________________________________ > 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.
_______________________________________________ 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. _______________________________________________ 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.