[time-nuts] homebrew maser

[Bob Camp]

Hi

Both seem to require a *lot* more work than a maser, not to mention a steady
flow of liquid nitrogen. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Heathkid
Sent: Tuesday, August 31, 2010 10:11 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] homebrew maser

How about a "Laser-Cooled Mercury Ion Frequency Standard"?
http://tf.nist.gov/general/pdf/1225.pdf

Here's another approach:

"A diode-laser optical frequency standard based on laser-cooled Ca 
atoms:Sub-kilohertz spectroscopy by optical shelving detection"
http://www.nist.gov/customcf/get_pdf.cfm?pub_id=105042


----- Original Message ----- 
From: "John Miles" <jmiles at pop.net>
To: <jfor at quik.com>; "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Tuesday, August 31, 2010 8:02 PM
Subject: Re: [time-nuts] homebrew maser


>
>>
>> Microwave test gear and plumbing is very significantly harder to get at
>> 24
>> GHz than at 1.4 GHz.
>>
>> At a guess I've seen easily 100 times more stuff available at 1.4 GHz.
>
> That is so far down the list of "101 Things That Are Hard About Building a
> Hydrogen Maser" I'm not even sure it makes the top 101. :)
>
> There is a ton of prior art in the Amateur Radio microwave community on 24
> GHz microwave activity and construction.  At 1.420 GHz, not so much.
>
> -- john, KE5FX
>
>
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