[time-nuts] PTTI 2012, part 3/3
paulswedb at gmail.com
Sat Dec 8 00:50:12 UTC 2012
They did respond back and I am limited to 1. Wanted 2 but such is life. :-)
Will order most likely Monday.
On Fri, Dec 7, 2012 at 11:45 AM, paul swed <paulswedb at gmail.com> wrote:
> Thanks I will try this out. Pretty darn interesting indeed and at $35.
> Great. Thats my kind O price.
> On Fri, Dec 7, 2012 at 8:39 AM, W2GPS <w2gps at cnssys.com> wrote:
>> Regarding SSR-Pricing, Synergy said they will make the new SSR-6Tr timing
>> available at $35 FOB San Diego (about half the $69.85 commercial price)
>> educational pursuits which include Ham radio, educational institutions,
>> experimenters, etc. (limit one part per customer). For comparison, the
>> LEA-6T module alone sells for more than $100 each in low quantities.
>> The best way to ask Synergy about this is by using the form at
>> -----Original Message-----
>> From: paul swed [mailto:paulswedb at gmail.com]
>> Sent: Thursday, December 06, 2012 12:02 PM
>> To: Tom Van Baak; Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] PTTI 2012, part 3/3
>> Great comments and a good read. OK so what does the drop in replacement
>> Thanks lots to read here.
>> On Thu, Dec 6, 2012 at 10:24 AM, Tom Van Baak <tvb at leapsecond.com> wrote:
>> > > Still, there are always a number of talks of more general interest to
>> > time nuts.
>> > > In the next few postings I'll give more details on a couple of topics:
>> > And here's the third part of my PTTI report...
>> > - Vendor presentations/Symmetricom/Miles
>> > Besides 3 days of presentations, PTTI also hosts a vendor/exhibit area.
>> > This includes the usual T&F suspects like FEI, Symmetricom, TRAK,
>> > Spectracom, SpectraDynamics, TimeTech, etc. Most of this gear is outside
>> > the budget of a regular time-nut but it's always nice to see and touch
>> > what's on display, knowing in ten years it will show up on eBay.
>> > Yes, that was John Miles in the Symmetricom booth showing off his, I
>> > their new TimePod and wearing a Symmetricom shirt. We've had a number of
>> > time nut "graduates" over the years: Rick Hambly went on to start CNS
>> > Systems, Said Jackson started Jackson Labs, John Miles became Miles LLC
>> > both have ties with Symmetricom. You'll see press releases like this
>> > <
>> > >
>> > If you have more questions, I'm sure John will be happy to answer then
>> > or off- the list.
>> > - M12/uBlox GPS board
>> > It was very nice to see Tom Clark ("grandfather" of time-nuts) at PTTI;
>> > was from his work at NASA with VLBI, masers, and Motorola Oncore GPS
>> > receivers that a number of us caught the precise time bug in the early
>> > Many of you know him as the author of the often recommended paper
>> > "Critical Evaluation of the Motorola M12+ GPS Timing Receiver vs. the
>> > Master Clock at the United States Naval Observatory, Washington DC"
>> > is available here:
>> > <http://www.gpstime.com/files/PTTI/PTTI_2002_CNS_Testbed.pdf>
>> > <http://www.gpstime.com/files/PTTI/PTTI_2002_CNS_Testbed_VG.ppt>
>> > Anyway, this year Tom Clark presented performance results of a new GPS
>> > board. It is h/w and s/w compatible with the Motorola M12 receiver used
>> > many existing T&F products, but it's based on a uBlox-6T chip instead of
>> > the Motorola or iLotus M12 chip. The trick is that Rick Hambly added a
>> > on the board to make it talk exactly like an M12. The reason for this
>> is to
>> > allow drop-in replacement of the original Motorola M12 or still-current
>> > iLotus M12+ with this new one. It's called the Synergy SSR-6T.
>> > That means that any instrument (e.g., GPSDO) that uses an M12 can be
>> > upgraded to the uBlox-6T. Tom's presentation contains charts showing the
>> > performance improvement:
>> > <
>> > >
>> > <http://www.cnssys.com/publications.php>
>> > I have one to play with and hope to duplicate his results. I didn't get
>> > pricing/availability info but it is supposed to be "really cheap". (Tom
>> > Clark -- can you provide this info when you get it?)
>> > - Quartz in space
>> > With all the focus on fiber and optical and atomic clocks, it's
>> > to hear now and then about good old quartz. This was a fascinating talk
>> > about real-world (or real out-of-this-world) performance of quartz
>> > oscillators in space. What they did was mine recorded telemetry from
>> > space missions looking to directly/indirectly measure the frequency of
>> > quartz oscillator over years in space.
>> > Just like we use LH to monitor the EFC of a GPSDO, they monitor the EFC
>> > the quartz LO in the GPS sats. In addition to normal drift there are
>> > effects of radiation dose and solar flares. I'll post the URL of the
>> > when it's out. Meanwhile I saw a bunch of fine papers/presentations at
>> > FEI site:
>> > http://www.freqelec.com/tech_lit.html
>> > - ION/PTTI 2013 in Bellevue, WA (!)
>> > After 44 years, PTTI is changing "management". Instead of being
>> > by the US government (USNO, NASA, JPL, and DoD) it will now be run by
>> > (Institute of Navigation). This keeps the government out of the
>> > and conference business.
>> > The next ION/PTTI will be held in Bellevue, WA. If you haven't
>> > attending an ION or PTTI conference before, this might be a good one to
>> > try. Also, since that's my hometown, I plan to have an "open house"
>> > the conference. That means I have a year to clean up the lab so more
>> > one person can walk in it...
>> > A number of people continued to comment on the relativity experiment I
>> > a few years ago. I have now posted the original (190 page) power-point
>> > presentation I gave at PTTI that year:
>> > http://www.leapsecond.com/ptti2006/
>> > - The state of Time-Nuts
>> > Lastly, I wanted to make a note about time-nuts. I was pleasantly
>> > surprised how many professionals already know about the time-nuts list
>> > lurk here. This group has really done well. Perhaps propelled by
>> > in the telecom/optical world or neutrino experiments, there's a whole
>> > crop of scientists in the precise time field. Formal technical journal
>> > articles by PhD's tend not to deal with the mundane details of precise
>> > measurement and lab equipment so people turn to google, and find us
>> > As the list grows we face some issues about posting bandwidth, focus,
>> > repetition. The list is mostly unmoderated, so it's completely up to
>> you to
>> > keep the list relevant and interesting. Please resist too off-topic
>> > or low-content postings. For now at least, the archived list is rich
>> > that it acts like a wiki or faq.
>> > As usual, if you have suggestions on how to make the list better please
>> > send them to me (tvb at LeapSecond.com) and John (jra at febo.com).
>> > Thanks,
>> > /tvb
>> > _______________________________________________
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