[time-nuts] time-nuts Digest, Vol 105, Issue 47

M. Simon msimon6808 at yahoo.com
Tue Apr 16 01:09:37 UTC 2013


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: "time-nuts-request at febo.com" <time-nuts-request at febo.com>
>To: time-nuts at febo.com 
>Sent: Tuesday, April 16, 2013 12:13 AM
>Subject: time-nuts Digest, Vol 105, Issue 47
> 
>
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>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" <david.kirkby at onetel.net>
>To: Discussion of precise time and frequency measurement
>    <time-nuts at febo.com>
>Subject: Re: [time-nuts] Signal Hound
>Message-ID: <516C67AD.4040203 at onetel.net>
>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 <lists at rtty.us>
>To: Discussion of precise time and frequency measurement
>    <time-nuts at febo.com>
>Subject: Re: [time-nuts] Common-View GPS Network
>Message-ID: <E03601AF-B51D-4041-A4F7-093F847A302B at rtty.us>
>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 <lachlan at twopif.net> 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 -- time-nuts at febo.com
>> 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 <mspencer12345 at yahoo.ca>
>To: time-nuts at febo.com
>Subject: Re: [time-nuts] Common-View GPS Network
>Message-ID:
>    <1366065947.80876.YahooMailClassic at web121006.mail.ne1.yahoo.com>
>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 <magnus at rubidium.dyndns.org>
>To: time-nuts at febo.com
>Subject: Re: [time-nuts] Common-View GPS Network
>Message-ID: <516C67E2.80501 at rubidium.dyndns.org>
>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 -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>
>
>
>------------------------------
>
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>End of time-nuts Digest, Vol 105, Issue 46
>******************************************
>
>
>------------------------------
>
>Message: 4
>Date: Tue, 16 Apr 2013 00:29:52 +0100
>From: "Alan Melia" <alan.melia at btinternet.com>
>To: "Discussion of precise time and frequency measurement"
>    <time-nuts at febo.com>
>Subject: Re: [time-nuts] Brooks Shera ASM release
>Message-ID: <88B1C5222B254F7A9D33F7DDC1D1C967 at 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: <EWKehren at aol.com>
>To: <time-nuts at febo.com>
>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,
>> alan.melia at btinternet.com 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: <EWKehren at aol.com>
>> To:  <time-nuts at febo.com>
>> 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  -- time-nuts at 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 at 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 at febo.com
>> 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" <alan.melia at btinternet.com>
>To: "time-nuts measurement" <time-nuts at febo.com>
>Subject: Re: [time-nuts] Brooks Shera ASM release
>Message-ID: <7FB54BB7857448C9A0E1348C5EAFF930 at 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 <chris at elfpen.com>
>To: Discussion of precise time and frequency measurement
>    <time-nuts at febo.com>
>Subject: Re: [time-nuts] Brooks Shera thanks options
>Message-ID: <516C97C1.1080002 at elfpen.com>
>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: <EWKehren at aol.com>
>> To: <time-nuts at febo.com>
>> 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,
>>> alan.melia at btinternet.com 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: <EWKehren at aol.com>
>>> To:  <time-nuts at febo.com>
>>> 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  -- time-nuts at 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 at 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 at 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 at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>> 
>> 
>
>
>
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>
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>time-nuts mailing list
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>End of time-nuts Digest, Vol 105, Issue 47
>******************************************
>
>
>


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