Hi You can tune it from "easy" to "impossible" and still know where it is for judging purposes. Sounds like a pretty good way to do it.
Bob On May 20, 2010, at 6:18 PM, WarrenS wrote: > > True, > I did not consider they may want to Mis-Tune something to its limit > > Why not use a good OXCO, with a pot connected to its EFC? > Now that would make a good demo and show some practical use, and only need to > wait around a sec or so. > and it would be much more fun than watching the RB drift which is about as > fun as watching grass grow. > > > ws > > ****************** > time-nuts] Thunderbolt, Rb,Bob Camp lists at rtty.us > Thu May 20 22:05:59 UTC 2010 > > Hi > > The rubidium should tune over a +/- 1x10^-9 range. A nanosecond per second > isn't all that hard to spot. At 10 MHz you'll do a full 360 in 100 seconds. > > Bob > > ****************** > > On May 20, 2010, at 5:57 PM, WarrenS wrote: > >> >> I hope it is a LONG show with a lot of patent people. >> This is way above the typical WWV stuff. >> Any good adjusted RB with a correctly set up Tbolt will take >2.5 hrs to do >> the 360. >> Delta 1e-11 = 10,000 sec for 100 ns change. >> >> I understand it is not what your desired goal is, >> But would be much better off with a PC and Lady Heather, that way only need >> to wait a minute or less. >> Maybe a better test for the O-Scope is to show the noise jitter between them. >> >> ws >> >> **************** >> >> time-nuts] Thunderbolt, Rb, Scopes at SF Bay Maker Faire this weekendLeigh >> L. Klotz, Jr. WA5ZNU Leigh at WA5ZNU.org >> Thu May 20 20:00:21 UTC 2010 >> >> As part of the SF Bay Area Maker Faire this weekend, I'll be showing a >> Thunderbolt GPSDO and a FE-5680A Rubidium disciplined oscillator, both >> connected to a $25 flea-market oscilloscope. >> >> The demo is part of a hands-on "things to do with oscilloscopes." In this >> experiment, we'll have visitors use a stopwatch to measure how long it >> takes for a 360 degree phase change, and use that to calculate the >> fractional PPB difference between the two frequencies. >> >> We'll be at the ARRL booth, which is in the Fiesta Building, near the >> Tesla Stage entrance. >> >> http://www.makerfaire.com/ >> >> Leigh/WA5ZNU >> > _______________________________________________ > 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.