); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] It is possible to build a standard, of very good long term stability, by amplifying the radiation produced by a simple incandesent light bulb. The frequency produced is well within the capabilities of present technology......................................Don C.
----- Original Message ----- From: "Tom Van Baak" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Saturday, July 28, 2007 5:59 AM Subject: Re: [time-nuts] Homebrew primary standard? > ); SAEximRunCond expanded to false > Errors-To: > [EMAIL PROTECTED] > >> Has there been any attempts (or successes) at someone outside of a >> national laboratory, and commercial R&D groups to build a primary >> frequency/time standard? > > Two attempts to build hydrogen masers that I know of; little > or no progress. > >> I am not sure if there is anything that would prevent an individual >> from building a cesium standard of the quality seen in early models >> from NPL and NIST, or an industrial style (compact Ramsey cavity) >> standard. >> >> -Michael > > Yes, it would be possible. I know that several of us have > considered it, for a few minutes at least. > > It would require some expertise in physics, electronics, > glass and metal fabrication, vacuum systems, magnet > design, electron multipliers, and who knows that else. > You'd go through many prototypes. To see if it's working > you might want another one in-house. > > You'd learn a great deal. It would be an amazing story. > In the end, you'd end up with a standard accurate to one > part in ten to the 10th or 11th that would work for hours > or even days at a time. > > The reason no one has tried it, I believe, is that you can > get the same or better accuracy with a simple $75 GPS > receiver today. It would seem motivation for the project > would be the biggest problem. > > /tvb > > > _______________________________________________ > 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. > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.476 / Virus Database: 269.10.22/923 - Release Date: 7/27/2007 > 6:01 PM > > _______________________________________________ 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.
