[time-nuts] Thunderbolt, Rb,

Bob Camp lists at rtty.us
Thu May 20 22:54:35 UTC 2010


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 
>> 
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