[time-nuts] What can you do with 100 drones flying in formation?

[Mark Sims]

Oops, that last message went to the wrong list...
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[time-nuts] What can you do with 100 drones flying in formation?

[Mark Sims]

http://www.theregister.co.uk/2016/09/03/intel_drone_show_thx_faa/
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Re: [time-nuts] Diophantine frequency synthesis articles

[Mike Feher]

Wow, the last time I heard of this word was in the late 60's in a graduate 
course on number theory. I still remember the story of the monkey and the 
coconuts :). Admittedly I did not look at any of the posted links, but, have no 
 idea how Diophantine equations can help frequency counters. Regards - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell


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Re: [time-nuts] GPSDO design articles

[Charles Steinmetz]

I am pleased to report that Didier has moved these document to the 
general population on ko4bb.com. They can be accessed by going to the 
"Manuals" page  and 
searching for "PTF", or by following the document-specific download links:






Best regards,

Charles



Finally for today, I posted two white papers from PTF, Inc. that discuss
the basics of GPSDO design.  These are the best accessible discussions
of "how it's done" at the professional level that I'm aware of, and
(IMO) should be required reading for anyone attempting a DIY GPSDO design.

Note that some of the ADEV graphs show the use of local oscillators that
are less stable at short tau than most time-nuts would use, so the
corresponding crossover frequencies are lower (PLL bandwidths are
higher) than would be appropriate for a time-nuts grade GPSDO by a
factor of ~10.

The file names are:

  Basics_of_GPS_discipline_PTF_AN_APP-29
  Optimizing_stability_in_GPSDO_design_PTF

(Didier's system will convert the underscore characters to spaces for
indexing.)

Once again, these are still in quarantine, but will be searchable when
Didier moves them into the general population (which could take several
weeks).

When that happens, "PTF" will be a good search term.

Best regards,

Charles




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Re: [time-nuts] Diophantine frequency synthesis articles

[Charles Steinmetz]

I am pleased to report that Didier has moved these document to the 
general population on ko4bb.com. They can be accessed by going to the 
"Manuals" page  and 
searching for "diophantine", or by following the document-specific 
download links:















Best regards,

Charles



I also posted six files pertaining to Diophantine frequency synthesis on
Didier's site.  Four are papers dating to 2006-2007 by Sotiriadis, one
is a paper of the same era by Stork, and one is a patent granted to
Wilke in 1993.

These are also still in quarantine, but will be searchable when Didier
moves them into the general population (which could take several weeks).
  "Diophantine" will be a good search term.

Best regards,

Charles



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Re: [time-nuts] Short-term frequency stability symposium 1964

[Charles Steinmetz]

I am pleased to report that Didier has moved this document to the 
general population on ko4bb.com.  It can be accessed by going to the 
"Manuals" page  and 
searching by file name ("Short-Term Frequency Stability IEEE-NASA 
symposium NASA SP-80 1965"), or by following the document-specific 
download link:




Best regards,

Charles




I was looking through my files and found a 1965 NASA publication that
contains the papers presented at a 1964 IEEE-NASA symposium on the
short-term stability of oscillators.  It's a wonderful collection of
seminal papers by most of the usual suspects of the era (see attached
table of contents).

I posted it to Didier's site.  It's still in quarantine, but will be
searchable when Didier moves it into the general population (which could
take several weeks).  The file name is:

"Short-Term Frequency Stability IEEE-NASA symposium NASA SP-80 1965"

Best regards,

Charles



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Re: [time-nuts] What's the best Windows 10 ntp client?

[David J Taylor]

Well then the ntpd program written into MY Windows CONTROLLED by the
program represented in the attached image

It says it is a Monitor, but it ALSO controls how NTP works on MY machine...

It keeps my computer as accurate as can be expected considering I'm
using remote server sources and wireless connection to the internet...

I'll worry about compiling my own ntpd, et al. once I decide to run my
own stratum 1 server...

I'm pretty consistently within +/- 4 milliseconds at any given time...
usually < +/- 2 ms.

__
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389
==

Clay,

One suggestion: you may be better off using the "pool" directive and 
allowing NTP to select its own choice of servers rather than using 
potentially overloaded stratum-1 servers.  Perhaps for Windows it won't make 
too much difference.  You'll enjoy making your own NTP stratum-1 server 
whether it be on Windows or on e.g. a Raspberry Pi card.


Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv 


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