[time-nuts] Home built Ammonia cell std !! / Home built cesiumclocks???

[John Franke]

Now that is something I am interested in doing.  I finally secured use of a 
diffusion pump at a local university and expect to be making my first sealed 
all-glass absorption cells this fall.  The ammonia pressure needs to be 
around 8-10 microns.  I will be trying for a double pass cell giving a pass 
length between 10 and 12 feet.  The first ammonia atomic clock used a path 
length of 33 feet.  The cell was made from waveguide and did not hold a 
charge due to leaks or the ammonia reacting with the gold plated waveguide. 
I believe the best ammonia based standard was only good to 10 ^ -8 in 
frequency stability.

John WA4WDL

----- Original Message ----- 
From: "Luis Cupido" <cupido at mail.ua.pt>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Sunday, June 29, 2008 11:40 AM
Subject: [time-nuts] Home built Ammonia cell std !! / Home built 
cesiumclocks???


> We dont get much info/comments about this
> But what would an ammonia cell standard be able to do.
> I mean frequency/time wise.
>
> Maybe easier and simpler ?
> comments ?
>
> Luis Cupido.
> ct1dmk.
>
> (I understand the frequencies are much higher
> but that is not a problem, at least for me).
>
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