Hi If you stretch out to > 10,000 samples and watch over a full 24 hour period, you likely will see some in the +/-1.5 ns region.
Bob On Sep 8, 2012, at 11:06 AM, ewkeh...@aol.com wrote: > 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. _______________________________________________ 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.
