[time-nuts] PTTI 2012, part 3/3
paulswedb at gmail.com
Fri Dec 7 16:45:57 UTC 2012
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) for
> 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 one:
> > <
> > >
> > 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" which
> > 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
> > 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 many
> > 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 organized
> > by the US government (USNO, NASA, JPL, and DoD) it will now be run by ION
> > (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 considered
> > 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 than
> > 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 or
> > lurk here. This group has really done well. Perhaps propelled by advances
> > in the telecom/optical world or neutrino experiments, there's a whole new
> > 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 here.
> > As the list grows we face some issues about posting bandwidth, focus, and
> > repetition. The list is mostly unmoderated, so it's completely up to you
> > keep the list relevant and interesting. Please resist too off-topic posts
> > 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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