); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Sorry, I forgot three of these : ;-)......Don C.
----- Original Message ----- From: "Don Collie" <[EMAIL PROTECTED]> To: "Tom Van Baak" <[EMAIL PROTECTED]>; "Discussion of precise time and frequency measurement" <[email protected]> Sent: Saturday, July 28, 2007 1:00 PM Subject: Re: [time-nuts] Homebrew primary standard? > ); 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. > > > -- > 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.
