Near the bottom of this is a bit on the UC lab school.
Engineering is the art of making what you want from what you can get at a profit. >________________________________ > From: "[email protected]" <[email protected]> >To: [email protected] >Sent: Tuesday, April 16, 2013 12:13 AM >Subject: time-nuts Digest, Vol 105, Issue 47 > > >Send time-nuts mailing list submissions to > [email protected] > >To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >or, via email, send a message with subject or body 'help' to > [email protected] > >You can reach the person managing the list at > [email protected] > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of time-nuts digest..." > > >Today's Topics: > > 1. Re: Signal Hound (Dr. David Kirkby) > 2. Re: Common-View GPS Network (Bob Camp) > 3. Re: Common-View GPS Network (Mark Spencer) > 4. Re: Brooks Shera ASM release (Alan Melia) > 5. Re: Brooks Shera ASM release (Alan Melia) > 6. Re: Brooks Shera thanks options (Chris Howard) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Mon, 15 Apr 2013 21:48:45 +0100 >From: "Dr. David Kirkby" <[email protected]> >To: Discussion of precise time and frequency measurement > <[email protected]> >Subject: Re: [time-nuts] Signal Hound >Message-ID: <[email protected]> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >On 04/15/13 04:39 AM, Jim Lux wrote: >> Inexpensive USB spectrum analyzer.. http://www.signalhound.com/ > >It's not that inexpensive. I assembled a 22 GHz spectrum analyzer based on the >HP 70000 modular measurement system for about the same money. The 22 Ghz >tracking generator module is very expensive, but I don't have that. Since I >have >a 20 GHz VNA, owning a tracking generator on a spectrum analyzer is not that >important. The 2.9 GHz tracking generator for the HP 70000 series is not that >expensive. > > >The used HP or similar kit has done most of its depreciating. > >Of course, I can see advantages in small, compact units with a warranty, but >I'd >certainly want to consider buying used professional equipment. > > >-- >Dr. David Kirkby Ph.D C.Eng MIET > > >------------------------------ > >Message: 2 >Date: Mon, 15 Apr 2013 17:40:20 -0400 >From: Bob Camp <[email protected]> >To: Discussion of precise time and frequency measurement > <[email protected]> >Subject: Re: [time-nuts] Common-View GPS Network >Message-ID: <[email protected]> >Content-Type: text/plain; charset=us-ascii > >Hi > >One common requirement is a receiver that will give you "per satellite" >information that you can turn into time. About the only way around that is to >pre-determine a set of sats and flag the rest as "do not use". With the second >approach, various geometric issues can get a bit exciting. Either way good >antenna locations and local clocks are needed. > >Do you have a specific receiver in mind? > >Bob > >On Apr 15, 2013, at 8:55 AM, Lachlan Gunn <[email protected]> wrote: > >> Hello all. >> >> >> >> Having spent some time working over the last year on GPS time stability >> measurement, I'm keen to move onwards and upwards and have a go at >> common-view time transfer. While my receivers are in the post, I have >> thinking about my next direction. One thought that I have had is to try to >> write some software that can be used for real-time common-view (public if >> there is interest, but I am getting ahead of myself I think). >> >> My question to those in the know is whether they have found common-view to >> be useful over medium timescales (say, an hour or four). My understanding >> is that after a day or so the GPS signal itself becomes usable as a >> standard, so building a network is probably not tremendously useful over >> these sorts of time periods, but looking at such as figure 6 of [1], >> common-view should still be useful between a few minutes and hours. Has >> anyone here tried using such a method to produce their own short-term time >> scale, or is one better off just taking the simple route and tracking GPS >> time directly? >> >> >> >> Thanks, >> >> Lachlan >> >> >> >> >> >> [1] http://www.pttimeeting.org/archivemeetings/2008papers/paper45.pdf >> >> _______________________________________________ >> 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. > > > >------------------------------ > >Message: 3 >Date: Mon, 15 Apr 2013 15:45:47 -0700 (PDT) >From: Mark Spencer <[email protected]> >To: [email protected] >Subject: Re: [time-nuts] Common-View GPS Network >Message-ID: > <[email protected]> >Content-Type: text/plain; charset=iso-8859-1 > > > >I'd be interested in understanding what it would take to participate in this >type of experiment.?? I'm unlikely to have any free time for this over the >next several months but if for example there was a particular GPS receiver >that was well suited for this type of work that would be useful info for me.?? >(Recently at work I've started to become involved with precision GPS location >systems and the claimed 3D accuracies that can be achieved using post >processing seem very impressive.) >Thanks in advance for any comments. >? >? >Regards >Mark Spencer >------------------------------ > >Message: 6 >Date: Mon, 15 Apr 2013 22:49:38 +0200 >From: Magnus Danielson <[email protected]> >To: [email protected] >Subject: Re: [time-nuts] Common-View GPS Network >Message-ID: <[email protected]> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >Lachlan, > >This would be fun to try with a few sites involved. It requires a fairly >decent GPS and antenna at each location, and loging and then >post-processing. Would be fun to see how well it can be made to perform. > >Cheers, >Magnus > >On 04/15/2013 02:55 PM, Lachlan Gunn wrote: >> Hello all. >> >> >> >> Having spent some time working over the last year on GPS time stability >> measurement, I'm keen to move onwards and upwards and have a go at >> common-view time transfer.? While my receivers are in the post, I have >> thinking about my next direction.? One thought that I have had is to try to >> write some software that can be used for real-time common-view (public if >> there is interest, but I am getting ahead of myself I think). >> >> My question to those in the know is whether they have found common-view to >> be useful over medium timescales (say, an hour or four).? My understanding >> is that after a day or so the GPS signal itself becomes usable as a >> standard, so building a network is probably not tremendously useful over >> these sorts of time periods, but looking at such as figure 6 of [1], >> common-view should still be useful between a few minutes and hours.? Has >> anyone here tried using such a method to produce their own short-term time >> scale, or is one better off just taking the simple route and tracking GPS >> time directly? >> >> >> >> Thanks, >> >> Lachlan >> >> >> >> >> >> [1] http://www.pttimeeting.org/archivemeetings/2008papers/paper45.pdf >> >> _______________________________________________ >> 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] >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >End of time-nuts Digest, Vol 105, Issue 46 >****************************************** > > >------------------------------ > >Message: 4 >Date: Tue, 16 Apr 2013 00:29:52 +0100 >From: "Alan Melia" <[email protected]> >To: "Discussion of precise time and frequency measurement" > <[email protected]> >Subject: Re: [time-nuts] Brooks Shera ASM release >Message-ID: <88B1C5222B254F7A9D33F7DDC1D1C967@gnat> >Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > >Ok Bert I will stick my head above the parapet and repeat that >query.Sometimes it is frustarting the get no response, but later get >personal appreciation as you meet individuals. I didn't know the guy. I was >trying with a friend to contact him long after the original article. We were >disapointed but not unhappy. I certainly appreciate the help and expertise >the Group provides......and it is nice to be able to say so, and salute the >work Brooks did. > >Thanks and Best Wishes >Alan Melia >(G3NYK) >----- Original Message ----- >From: <[email protected]> >To: <[email protected]> >Sent: Monday, April 15, 2013 8:17 PM >Subject: Re: [time-nuts] Brooks Shera ASM release > > >> Alan >> You may suggest something to time nuts, looking at the response I doubt it >> and ask my self why did three of us spend three weeks to fully check it >> out >> and fix some of the code. Will reflect future projects. >> Bert Kehren >> >> >> In a message dated 4/12/2013 8:39:40 P.M. Eastern Daylight Time, >> [email protected] writes: >> >> Bert is there any way we can add our names to some expression of thanks >> to >> his widow Karen and her helpers for their work and maybe leave a >> remembrance >> of his worldwide friends for his family? >> >> Thanks for your efforts >> Best wishes >> Alan Melia (G3NYK) >> UK >> >> >> ----- Original Message ----- >> From: <[email protected]> >> To: <[email protected]> >> Sent: Friday, April 12, 2013 8:52 PM >> Subject: [time-nuts] Brooks Shera ASM release >> >> >>> The time-nuts server takes out all spaces so allow me to resend the >>> acknowledgements Bert Kehren >>> ____________________ >>> ____________________ >>> >>> >>> At this time I like to thank Brooks for all the work he did, his wife >>> Karen Stoll for deciding to release HEX and ASM and Bob Leichner who >>> implemented the software commands. Brooks did not have the chance to >> put >>> final >>> touches in and complete his work, so Richard McCorkle stepped in and >> made >>> the >>> final changes. For almost a decade Brooks and Richard collaborated on >> the >>> GPSDO, which benefits all of us. Also major recognition has to go to >>> Juerg >>> Koegel an other time nut that put our other projects on hold to check >>> every >>> iteration. Attached is part of a test that clearly shows the >> performance >>> of >>> the Alpha filter. Limited by attachment size contact me off list for >> more >>> data. >>> _______________________________________________ >>> 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. > > > >------------------------------ > >Message: 5 >Date: Tue, 16 Apr 2013 00:40:07 +0100 >From: "Alan Melia" <[email protected]> >To: "time-nuts measurement" <[email protected]> >Subject: Re: [time-nuts] Brooks Shera ASM release >Message-ID: <7FB54BB7857448C9A0E1348C5EAFF930@gnat> >Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > >Bert I am grateful for the work you and friends have done. > >Is there any way we can add our names to some expression of thanks from >members of the Group to his widow Karen and her helpers for their work in >making the checked source code for the GPSDO available to us and maybe leave >a token of remembrance of his worldwide friends, for his family? > >Even if it is just a "me too" replying to this message. > >Alan Melia (G3NYK) Ipswich, UK > > > >------------------------------ > >Message: 6 >Date: Mon, 15 Apr 2013 19:13:53 -0500 >From: Chris Howard <[email protected]> >To: Discussion of precise time and frequency measurement > <[email protected]> >Subject: Re: [time-nuts] Brooks Shera thanks options >Message-ID: <[email protected]> >Content-Type: text/plain; charset=windows-1252 > > > > >The online obit at >http://www.santafefuneraloption.com/sitemaker/sites/santaf0/obit.cgi?user=949646Shera >says, > >"Memorials may be made to the University of Chicago Laboratory Schools, >the Sierra Club, or any organization of the Donor?s choice." > > >University of Chicago Laboratory Schools >http://www.ucls.uchicago.edu/ (look under 'Support Lab' for contribution >links) > >Sierra Club >http://www.sierraclub.org/ (big orange "DONATE" button) > > >I don't see a PayPal option on either one. > > > >Chris >W0EP > > > > > >On 4/15/2013 6:29 PM, Alan Melia wrote: >> Ok Bert I will stick my head above the parapet and repeat that >> query.Sometimes it is frustarting the get no response, but later get >> personal appreciation as you meet individuals. I didn't know the guy. I was >> trying with a friend to contact him long after the original article. We were >> disapointed but not unhappy. I certainly appreciate the help and expertise >> the Group provides......and it is nice to be able to say so, and salute the >> work Brooks did. >> >> Thanks and Best Wishes >> Alan Melia >> (G3NYK) >> ----- Original Message ----- From: <[email protected]> >> To: <[email protected]> >> Sent: Monday, April 15, 2013 8:17 PM >> Subject: Re: [time-nuts] Brooks Shera ASM release >> >> >>> Alan >>> You may suggest something to time nuts, looking at the response I doubt it >>> and ask my self why did three of us spend three weeks to fully check it out >>> and fix some of the code. Will reflect future projects. >>> Bert Kehren >>> >>> >>> In a message dated 4/12/2013 8:39:40 P.M. Eastern Daylight Time, >>> [email protected] writes: >>> >>> Bert is there any way we can add our names to some expression of thanks to >>> his widow Karen and her helpers for their work and maybe leave a >>> remembrance >>> of his worldwide friends for his family? >>> >>> Thanks for your efforts >>> Best wishes >>> Alan Melia (G3NYK) >>> UK >>> >>> >>> ----- Original Message ----- From: <[email protected]> >>> To: <[email protected]> >>> Sent: Friday, April 12, 2013 8:52 PM >>> Subject: [time-nuts] Brooks Shera ASM release >>> >>> >>>> The time-nuts server takes out all spaces so allow me to resend the >>>> acknowledgements Bert Kehren >>>> ____________________ >>>> ____________________ >>>> >>>> >>>> At this time I like to thank Brooks for all the work he did, his wife >>>> Karen Stoll for deciding to release HEX and ASM and Bob Leichner who >>>> implemented the software commands. Brooks did not have the chance to >>> put >>>> final >>>> touches in and complete his work, so Richard McCorkle stepped in and >>> made >>>> the >>>> final changes. For almost a decade Brooks and Richard collaborated on >>> the >>>> GPSDO, which benefits all of us. Also major recognition has to go to >>>> Juerg >>>> Koegel an other time nut that put our other projects on hold to check >>>> every >>>> iteration. Attached is part of a test that clearly shows the >>> performance >>>> of >>>> the Alpha filter. Limited by attachment size contact me off list for >>> more >>>> data. >>>> _______________________________________________ >>>> 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. >> >> _______________________________________________ >> 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] >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >End of time-nuts Digest, Vol 105, Issue 47 >****************************************** > > > _______________________________________________ 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.
