[time-nuts] Thunderbolt, Rb,

WarrenS warrensjmail-one at yahoo.com
Thu May 20 22:18:04 UTC 2010

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.


time-nuts] Thunderbolt, Rb,Bob Camp lists at rtty.us 
Thu May 20 22:05:59 UTC 2010 


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.



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 

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