Jack Hudler wrote: > Sheeesh! > Actually I use the 5501B for its intended purpose... I'm a bit of a precision > nut. Never seen an Allan variance plot of one. > > I prefer 473.6057788309637 THz :) > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of Robert Atkinson > Sent: Tuesday, November 07, 2006 2:55 AM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] HP 10811A/B OCXO OP/SRV manual is > onlineathparchive.com > AND HP 5501B manual. > > Hi Jack, > > Great scan! > > I was also most interested to see you had scanned the manual for another > HP reference that I have - the 5501B. With an accuracy of 1x10-7 and > stability of 2x10-8 it's not that great but the frequency is 473612.23 > GHz! For those who have not caught on yet, the 5501B is a stabilised > laser with about 1mW of 632.991372nm (red) output. > > > > Many thanks, > > Robert G8RPI. > > > > > > ________________________________ > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Jack Hudler > Sent: 06 November 2006 19:31 > To: 'Discussion of precise time and frequency measurement' > Subject: [time-nuts] HP 10811A/B OCXO OP/SRV manual is online > athparchive.com > > > > I just finished and posted the 10811A/B OP/SRV to hparchives.com. > > > > http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf > > > > Enjoy, > > Jack > > -------------------------------------------------------- > Any opinions expressed in this email are those of the individual and not > necessarily Genetix Ltd (Genetix) or any company associated with it. This > email > and any files transmitted with it are confidential and solely for the use of > the > intended recipient. If you are not the intended recipient or the person > responsible for delivering to the intended recipient, be advised that you have > received this email in error and that any use is strictly prohibited. If you > have received this email in error please notify Genetix by telephone on +44 > (0)1425 624600. > > > The unauthorised use, disclosure, copying or alteration of this message is > strictly forbidden. This mail and any attachments have been scanned for > viruses > prior to leaving Genetix network. Genetix will not be liable for direct, > special, indirect or consequential damages as a result of any virus being > passed > on, or arising from alteration of the contents of this message by a third > party. > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > To measure the Allan variance you need at least 2 (preferably more) stabilised lasers and a mixer (photodiode) plus a suitable amplifier to produce a beat signal for analysis. The beat frequency may be as high as 100 MHz with a pair of 5501s (frequency/wavelength accuracy of 0.1ppm) so the photodiode and associated amplifier will need adequate bandwidth.
Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
