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: [email protected] [mailto:[email protected]] 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" <[email protected]> To: <[email protected]>; "Discussion of precise time and frequency measurement" <[email protected]> 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 > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
