No subject


Fri Mar 9 14:26:22 EST 2007


what remains of this market (no I'm not a conspiracy nut, it's just
business), so it seems to me that the surplus market is going to get very
thin in the near future. 
Supply and demand dictates that surplus market prices will skyrocket out of
the vast majority of amateur reaches in the coming years.

So what's the next cesium standard to start showing up on eBay in numbers
with life left?

Jack

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of rlutwak at comcast.net
Sent: Friday, March 16, 2007 12:56 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Question for the cesium nuts.

> What are we going to do when all the CBTs owned by amateurs start to end
of 
> life? 
Buy another instrument off of Ebay.  It'll be cheaper, more accurate, and
last longer than the old one.  Plus, it'll have microprocessor control and
thus be cooler and more entertaining for the hackers.

> Anyone care to start a discussion on the merits of restoring a CBT to
life? 
It can't be done.  Trust me, I've done it.

-RL

--
---------------- 
Robert Lutwak, Senior Scientist 
Symmetricom - Technology Realization Center 
34 Tozer Rd. 
Beverly, MA 01915 

RLutwak at Symmetricom.com (Business) 
Lutwak at Alum.MIT.edu (Personal) 

(978) 232-1461 (Desk) 
(339) 927-7896 (Mobile) 
(978) 927-4099 (FAX)

-------------- Original message -------------- 
From: "Jack Hudler" <jack at hudler.org> 

> It seems to me that like all good things they must come to and end. 
> 
> If all CBTs have a life expectancy that varies depending on the 
> manufacturer. 
> 
> What are we going to do when all the CBTs owned by amateurs start to end
of 
> life? 
> 
> I for one am certainly not going to buy one, not at those prices! (Unless 
> I'm retired then that's another story) 
> You only have calculate the time value of money for that CBT purchase over

> the remaining time to retirement; If that doesn't stop you dead in your 
> tracks then this group really is aptly named! :) 
> 
> From my perspective, that of wanting to own a Cesium Standard; I don't 
> really want to layout the monies for something that's going to end of life

> on me shortly (few years) afterwards. 
> 
> I know that handling (Caesium) Cesium-133 is tricky at best. It's a heavy 
> alkali metal and contact with moisture is right out! 
> Other than that it's not terribly difficult to create a safe environment
to 
> work with it. 
> 
> So there must be something else that's considerably more difficult than 
> opening the tube, recharging the ampoule, resealing it, pulling an ultra 
> high vacuum and baking it out. 
> 
> I've not seen any pictures of a naked CBT, still I'm not too worried about

> cracking the tube open if its Pyrex, unless resealing it caused the cesium

> beam collimation to be lost. 
> 
> Are there if any getters to worry about? If so, how would one ablate the 
> contaminates of the surface? 
> 
> Anyone care to start a discussion on the merits of restoring a CBT to
life? 
> 
> Jack 
> 
> 
> 
> 
> 
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