Either of those are a lot harder than a H MASER. -John
============= > 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" <jmi...@pop.net> > To: <j...@quik.com>; "Discussion of precise time and frequency > measurement" > <time-nuts@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 >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.