Re: [time-nuts] thunderbolt "no UTC offset"

In my opinion nothing has to be changed. It is working OK this way. To improve performance it is worth to use linear regulators for the power supply +12V and -12V that are related to the OCXO supply and EFC. On Wed, May 2, 2012 at 9:24 AM, francesco messineo < francesco.messi...@gmail.com> wrote:

Re: [time-nuts] Sw for pm6680B

With the 350pS single shot resolution the PM6680 can't replace the 20pS of the 5370. Keep the 5370 as well. The PM6681 is 50pS. The SR620 is 25pS. On Wed, May 2, 2012 at 5:13 AM, "Pierre-François (f5bqp_pfm)" < pfmo...@wanadoo.fr> wrote: > Hi Nigel, Magnus, Bjorn & the Gang, > > Thanks for all yo

Re: [time-nuts] Ashtech 3DF GPS

According to this: cedb.asce.org/cgi/WWWdisplay.cgi?80010 it seems that this GPS uses carrier phase tracking... it seems interesting. On Tue, May 1, 2012 at 3:08 PM, Stan wrote: > On more or less of a whim, I found and bought an Ashtech 3DF GPS. The > interesting thing about this particular GPS

Re: [time-nuts] Trimble recommends RG-59 Antenna Cable.

Yes, I use the regular satellite TV cable: low loss, easy to find and cheap. On Mon, Apr 30, 2012 at 8:22 PM, Don Latham wrote: > My TrueTime gps rcvr uses rg-59 as well. > Don > Robert Atkinson > > Hi Ken, > > This is correct. Some other documents explain the rationale. Basically > > for long r

Re: [time-nuts] HP 10811D question

By checking the 10811A/B manual and the 10811D/E specifications they are perfectly equal. Pinout is the same as can be seen here http://www.qsl.net/d/dk7nt/cro/download/5091-1639E.pdf compared with www.hparchive.com/Manuals/HP-10811AB-Manual.pdf On Sat, Apr 28, 2012 at 11:19 AM, Christopher Bro

Re: [time-nuts] PICTIC II ready-made?

>>configuration is loaded from EEPROM to RAM on power up<< For every kind of logic? Even for the simplest XC3000 series (and the Altera equivalent EPM3000 series) small EEPROM CPLD? On Sat, Apr 28, 2012 at 9:04 AM, cfo wrote: > On Fri, 27 Apr 2012 12:03:20 -0700, Jerry Mulchin wrote: > > > You m

Re: [time-nuts] PICTIC II ready-made?

FPGA with internal flash memory to boot from, yes, but I think that small CPLD haven't to boot anything: they should have the interconnection array associated with the EEPROM cell array. On Fri, Apr 27, 2012 at 11:52 PM, David wrote: > On Fri, 27 Apr 2012 22:13:55 +0200, Azelio Boriani

Re: [time-nuts] PICTIC II ready-made?

By "preload" I think you mean the configuration step of the logic. It seems that the Xilinx one stops the clock after the configuration is done. Anyway using small EEPROM based CPLDs you have no clock at all: there is no configuration to load. On Fri, Apr 27, 2012 at 10:01 PM, Bruce Griffiths < br

Re: [time-nuts] Sub mm measurements with gps timing antennas?

Was this the paper you are referring to? tycho.usno.navy.mil/ptti/ptti99/PTTI_1999_405.PDF On Fri, Apr 27, 2012 at 4:14 PM, Attila Kinali wrote: > Moin, > > On Wed, 25 Apr 2012 20:45:54 -0400 (EDT) > saidj...@aol.com wrote: > > > > But.. is the CSAC not on the ITAR list? I would expect it to

Re: [time-nuts] PICTIC II ready-made?

Yes, better have someone who can help but nothing should prevent you from learning something. On Wed, Apr 25, 2012 at 4:44 PM, Attila Kinali wrote: > On Wed, 25 Apr 2012 15:24:50 +0200 > Azelio Boriani wrote: > > > I agree, nevertheless let me add: because it is a hobby proje

Re: [time-nuts] PICTIC II ready-made?

I agree, nevertheless let me add: because it is a hobby project it is good also starting to learn how to use the soldering iron. On Wed, Apr 25, 2012 at 2:59 PM, Attila Kinali wrote: > On Wed, 25 Apr 2012 02:01:36 + (UTC) > Andrew Rodland wrote: > > > Would anyone be willing to sell (or loa

Re: [time-nuts] Thunderbolt Question

There is a leap second waiting for June/July this year. On Mon, Apr 23, 2012 at 6:16 PM, Chris Albertson wrote: > Maybe it's the antenna, or a short in the cable (water in the coax) or a > nearby transmitters that is jamming the GPS signal. The simplest way to > diagnose the problem is by swapp

Re: [time-nuts] PRS-10 input and output calibrations

That is very interesting in my opinion and, for those who have access to more than one PRS10, further investigation should be done. I had a new PRS10 and, just out-of-the-box, it locked (not instantly, of course) to the HP53508 PPS. On Sun, Apr 22, 2012 at 10:47 PM, wrote: > With factory default

Re: [time-nuts] PRS-10 input and output calibrations

Björn, what do you mean with "We never got one to track the other in a reliable way"? Thai is, how can it be that a PRS10 cannot track another PRS10? What do you get when trying to track one with the other? On Sun, Apr 22, 2012 at 8:44 PM, Poul-Henning Kamp wrote: > In message <4f93f032.2040...

Re: [time-nuts] Question about precise frequency / phase measurement

Of course, there are PICTIC II, DMTD, DDMTD, SR620, HP5370B, Wavecrest, PM6681, HP53132. The simplest is using a scope and... wait. On Thu, Apr 19, 2012 at 9:53 PM, Bruce Griffiths wrote: > Use a dual mixer system with an offset LO. > > Bruce > > Azelio Boriani wrote: >

Re: [time-nuts] Question about precise frequency / phase measurement

Yes, and, as you can see, you have to wait 1 hour. On Thu, Apr 19, 2012 at 9:49 PM, wrote: > Hi Wolfgang, > > one of the easiest and very accurate ways to do this is simply to measure > the drift of the two 10MHz signals on an oscilloscope. Adjust the OCXO so > that this drift between the two tr

Re: [time-nuts] Question about precise frequency / phase measurement

And, if you are measuring, by analog mixing, two very slightly different frequencies, what do you expect to obtain if not a signal that is slow, very slow. How can you measure milliHertz or microHertz without waiting? On Thu, Apr 19, 2012 at 9:31 PM, Magnus Danielson < mag...@rubidium.dyndns.org>

Re: [time-nuts] Temex LPFRS-01

er holidays I opened one up, and now I'm trying > to grasp the inner workings... time allowing. > > > On 4/12/2012 7:50 PM, Azelio Boriani wrote: > >> Interesting... have to check my LPFRS now: only tested for the lock >> indicator when received and then put asid

Re: [time-nuts] Chinese Scopes

Right. I'll try to do the same: locating a 54717 to rent. On Tue, Apr 17, 2012 at 8:52 PM, wrote: > Haven't run into that battery problem.. but rented the 51717 from an Ebay > offerer for low $$ in the past. > > I simply sent him an email saying, "I see you are selling that unit in your > ebay

Re: [time-nuts] Opamp Phase noise: OPA653 additional measurements

OK, I'll follow the Enrico Rubiola/TSC5120 literature. On Tue, Apr 17, 2012 at 1:39 PM, Bob Camp wrote: > Hi > > My *guess* is that your 1Hz data may be as much from ambient changes as > from the op amps themselves. No data to back that up on these specific > parts, just a guess. > > Bob > > On

Re: [time-nuts] Chinese Scopes

Good, the HP54720. We have one but, unfortunately, lost the calibration (backup battery dead). Now it need the HP51717 to complete the calibration. So be warned not to let the backup battery go flat: replace it trying to supply, with a diode, the NVRAM. On Tue, Apr 17, 2012 at 7:01 AM, wrote: >

Re: [time-nuts] Opamp Phase noise: OPA653 additional measurements

Very good. I'm fascinated by the figures... how can such phase noise levels be measured and, in general, being able to "sense" the most faint signal. On Tue, Apr 17, 2012 at 11:25 AM, Bruce Griffiths < bruce.griffi...@xtra.co.nz> wrote: > Subsequent measurements using an improved technique has al

Re: [time-nuts] Lucent 40 dB Antenna

Exactly: I have used the network analyzer to test GPS antennae but a fixed mechanical mounting is needed to ensure the measurement consistency. On Sat, Apr 14, 2012 at 1:44 AM, paul swed wrote: > Yes indeed I think its quite challenge to really know whats up. > Though if you have sig gen and spe

Re: [time-nuts] GPS Splitter

I have one, it is OK. On Fri, Apr 13, 2012 at 12:19 AM, iov...@inwind.it wrote: > Just found on the auction site: > Item number: 220957196441 > Specs available at the manufacturer's website. > I have no idea if it is worth the price. > Might be of interest. > Antonio I8IOV > Note: I'm not affili

Re: [time-nuts] Re-radiating a GPS signal...??

test. >>>> >>>> David N1HAC >>>> >>>> On 4/12/12 10:17 AM, MailLists wrote: >>>> >>>>> GPS being extremely time-dependent, any delay introduced will affect >>>>> positioning precision. Also, the signal is too

Re: [time-nuts] Temex LPFRS-01

riend to keep a pile of rust (if >> water damage really is the problem) advertised as an used working item. >> >> Regards, >> bbg >> >> >> On 3/17/2012 4:10 PM, Azelio Boriani wrote: >> >>> LPFRS from fluke.l? OK, then open it up and clean it

Re: [time-nuts] Thoughts on lightning protection measures....

I have 2 TBolts but now I'm thinking to buy others to save them from the sacrifice... On Thu, Apr 12, 2012 at 3:58 PM, Jim Lux wrote: > On 4/12/12 6:22 AM, Michael Baker wrote: > >> Time-nutters-- >> >> Around here (N. Central Flori-DUH) it is not uncommon for >> near-by lightning strikes to dam

Re: [time-nuts] Re-radiating a GPS signal...??

Passive UHF TV repeaters were in use in Italy too. Nowadays, for the DVB-T TV, active gap-fillers are used instead. Active gap-fillers are same-channel repeaters with the necessary, sophisticated echo suppression technique. We have developed our echo suppression signal processor on a Xilinx Virtex5

Re: [time-nuts] WWVB phase modulation test April 15-16

I have a couple of BNC-to-scope_probe adapters... On Thu, Apr 12, 2012 at 9:56 AM, Hal Murray wrote: > > > Just the T and a DC block. 1/4 wave at 60 kHz is far, far longer than any > > cable you have. > > This is time-nuts. Somebody is likely to do something most of us would > consider, well, n

Re: [time-nuts] 5V GPS antenna on 3.3V device?

Yes, you need a bias T but first simply try if your antenna can workl with 3.3V too. On Tue, Apr 10, 2012 at 8:33 AM, Brooke Clarke wrote: > Hi N0UU: > > Just try it. I found that many of my old GPS antennas worked on the 3.3V > DAGR. > http://www.prc68.com/I/DAGR.**shtml#Ant

Re: [time-nuts] Road-trip and rubidium fiddles

OK, thanks for the clarifications. On Mon, Apr 9, 2012 at 9:08 PM, Magnus Danielson wrote: > On 04/09/2012 06:40 PM, Azelio Boriani wrote: > >> Interesting, now two questions: >> >> >> It is clear that the short term is limited by the instrument trigger >>

Re: [time-nuts] Road-trip and rubidium fiddles

Interesting, now two questions: >It is clear that the short term is limited by the instrument trigger jitter. A mixer pre->scaling is clearly needed. that is, a mixing to take down the 10MHz to a lower frequency? Mixing with a higher stability source? And, >I also gave a quick tour of just how m

Re: [time-nuts] 1PPS correction

Maybe they don't want to put in danger their position... On Sun, Apr 8, 2012 at 5:23 AM, Rich and Marcia Putz wrote: > Two thoughts; First Thought,the clock in a Jupiter-T is 40Mhz, that's 4 > times 10 Mhz last time I checked. Could not one of the Simple GPSDOs use > the OCXO multiplied by 4 to

Re: [time-nuts] Austron 2201, Tbolt, HP 3801 comparison question

Basically, with the Kalman method, you end up in tuning your mathematical model coefficients to follow exactly the OCXO; then you can do whatever you want: drive it to have a fast lock-in, drive it for extremely low drift, apply a forward correction to extend the holdover... On Sun, Apr 8, 2012 at

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

OK, taken a look: it seems that the smallest Spartan3 usable is the 400Kgates. I don't need the ZPU now but good to know. On Sat, Apr 7, 2012 at 3:35 PM, cfo wrote: > On Sat, 07 Apr 2012 13:19:14 +0200, Azelio Boriani wrote: > > > The Xilinx and Altera have their embedded CPU

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

The Cray-1 implementation is here http://chrisfenton.com/homebrew-cray-1a/ On Sat, Apr 7, 2012 at 1:47 PM, Javier Herrero wrote: > El 07/04/2012 13:19, Azelio Boriani escribió: > >> The Xilinx and Altera have their embedded CPUs (Microblaze and Nios) IP. >> I'm not famil

Re: [time-nuts] Austron 2201, Tbolt, HP 3801 comparison question

No need to discover how the HP SmartClock works: there is the Kalman filtering to help in better driving a clock disciplining. Indeed the SmartClock approach may be based on the Kalman method. The fundamental starting point is to have a good clock mathematical model. The "smart" part is the trimmin

Re: [time-nuts] FPGA GPSDO (Was: Re: NTP jitter with Linux)

The Xilinx and Altera have their embedded CPUs (Microblaze and Nios) IP. I'm not familiar with them and don't know how much they cost. Until now I have developed on Xilinx 50Kgates FPGA and 128 cells CPLD with the Xilinx's free tools. On Sat, Apr 7, 2012 at 7:53 AM, Chris Albertson wrote: > On Fr

Re: [time-nuts] Improving performance of a GPS antenna...?

How do you know it is coming from a specific direction? There is a terrestrial L-band transmitter? A radio link? Try to put a screen n*lambda+lambda/2 from the GPS antenna to create a null for the offending L-band frequency... On Thu, Apr 5, 2012 at 2:49 PM, Chuck Forsberg WA7KGX N2469R wrote: >

Re: [time-nuts] NTP jitter with Linux

>>On a side note, speaking of deterministic systems, why has no one built a GPSDO with an FPGA yet? Or an NTP server? :) Yes, I have: I have a GPSDO entirely on a 50Kgates FPGA (Spartan3 XC3S50) without microprocessor. GPS is the iLotus M12M and OCXO is a Morion MV201, the DAC is... well, not exac

Re: [time-nuts] Improving performance of a GPS antenna...?

So it can be done: try to emulate the Zephyr GPS antenna with the RF absorber. On Wed, Apr 4, 2012 at 3:56 PM, Robert Berg wrote: > You can get inexpensive conductive foam from Amazon. > > > On 4/4/2012 5:53 AM, Michael Baker wrote: > >> Hello, Time-Nutters-- >> >> I saw a rather expensive GPS a

Re: [time-nuts] Antenna for t-bolt

Yes, there was an antenna with the "sting" months ago, now that I see your PDF I remember but can't remember the price and the brand. On Tue, Apr 3, 2012 at 10:05 PM, wrote: > Typical chokerings are L1/L2 geodetic antennas. There is however "simple" > L1-only chokerings available from time to ti

Re: [time-nuts] Antenna for t-bolt

my BlackBerry Wireless thingy while I do other things... > > -Original Message- > From: Azelio Boriani > Sender: time-nuts-boun...@febo.com > Date: Tue, 3 Apr 2012 21:27:26 > To: Discussion of precise time and frequency measurement< > time-nuts@febo.com> > Reply

Re: [time-nuts] Antenna for t-bolt

Of course the elevation mask is only software and doesn't prevent the bad signal from entering the antenna but then the signal will not despread and should cause no harm to the computations. On Tue, Apr 3, 2012 at 9:19 PM, wrote: > The elevation angle filter is based on the satellite position, n

Re: [time-nuts] would an optical primary standard provide any general benefit?

Agreed. My consideration was general but, yes, money is necessary so a decision is a must to properly allocate the financial resources. On Tue, Apr 3, 2012 at 1:10 PM, Jim Lux wrote: > On 4/3/12 12:49 AM, Azelio Boriani wrote: > >> Yes, but nonetheless why not develop more stable p

Re: [time-nuts] Antenna for t-bolt

Chuck, I usually see GPS antennae flashed by lightning: have succedeed opening and repairing a couple of them but at times they are too bad to do anything. I use a network analyzer to test them after repairing here at work. On Tue, Apr 3, 2012 at 8:24 AM, gary wrote: > Going back to software fil

Re: [time-nuts] would an optical primary standard provide any general benefit?

Yes, but nonetheless why not develop more stable primary clock sources? We can always take care of the dissemination in the meantime and try to develop a more precise time transfer method. On Tue, Apr 3, 2012 at 2:39 AM, beale wrote: > Having read this NIST review paper by Thomas E. Parker, "The

Re: [time-nuts] Antenna for t-bolt

Yes, every antenna will do but the best is a dedicated timing antenna such as the Motorola Timing2000 and others. The low angle satellites can be masked out with the appropriate parameter. For the ultimate precision a geodetic/surveillance antenna (i.e. the Trimble Zephyr) is... well... really too

Re: [time-nuts] Antenna for t-bolt

Every antenna will work with the TBolt. It is of greater importance the positioning: must clearly see the sky all around, unless you are at a high latitude (>50 degrees) so that the north is less important as the latitude increases. I (but it is only my opinion) recommend the quadrifilar helix type

Re: [time-nuts] LEA6-T Group Buy

I see that the board has the serial port and the USB, so you have the complete I/O suite available. On Mon, Apr 2, 2012 at 10:11 PM, wrote: > > > > Note that there should soon be a LEA6T eval board available from sysmocom > > > > > http://laforge.gnumonks.org/weblog/2012/03/16/#20120316-osmo_lea

Re: [time-nuts] 1 pps correction

ine from Didier. > See the following link: > http://www.ko4bb.com/manuals/**index.php?dir=05%29_GPS_**Timing/SRS<http://www.ko4bb.com/manuals/index.php?dir=05%29_GPS_Timing/SRS> > > Sincerely, > > Stijn > > Op 02-04-12 09:48, Azelio Boriani schreef: > >> OK, tha

Re: [time-nuts] 1 pps correction

fast analog charge hardware, and an analog comparator that can > trigger a counter capture event, and some software for calibration and > control... > > bye, > Said > > Sent from my iPad > > On Apr 1, 2012, at 4:07, Azelio Boriani wrote: > > > Said, > &g

Re: [time-nuts] 1 pps correction

Agreed. The TBolt is the best. On Sun, Apr 1, 2012 at 9:10 PM, wrote: > The need for sawtooth correction comes from the fact that standalone GPS > receivers use a standard clock oscillator that is basically fixed frequency > (save for temperature and other fluctuations) and their only option is

Re: [time-nuts] CW12-TIM vs M12M and the world

, 30. Marz 2012 22:19 > An: > > Time-Nuts > Betreff: Re: [time-nuts] CW12-TIM vs M12M and > > the world > > > > > > > > > > Has anyone compared the M12M to the M12+? > > > Thanks for all the input, it is really appreciated. > >

Re: [time-nuts] Coax Connectors (was Re: Opera coordinator has resigned)

Yes we use it for the GPS antenna internal connection then on the panel we use the N connector. Anyway the MMCX seems so sloppy... not robust and steady as a MCX. On Sun, Apr 1, 2012 at 1:24 PM, Magnus Danielson wrote: > On 04/01/2012 01:01 PM, Azelio Boriani wrote: > >> Yes, I rec

Re: [time-nuts] 1 pps correction

Said, how complex is your 20pS time interval counter? Is it analog, FPGA, something else (if you can disclose some info, of course)? On Sat, Mar 31, 2012 at 11:44 PM, Hal Murray wrote: > > mar...@ptsyst.com said: > > I’ve seen that the peak to peak jitter is reduced from something like 27 > ns >

Re: [time-nuts] Coax Connectors (was Re: Opera coordinator has resigned)

Yes, I recommend using MCX/SMB. We use MCX, SMB and MMCX but the MMCX in my opinion is to avoid. On Sun, Apr 1, 2012 at 12:13 AM, Magnus Danielson < mag...@rubidium.dyndns.org> wrote: > On 03/31/2012 10:08 PM, Javier Serrano wrote: > >> On Sat, Mar 31, 2012 at 9:24 PM, Achim Vollhardt >> wrote:

Re: [time-nuts] 1 pps correction

zeropoint/pdf/m12m/M12M%20-%20User%20Guide%20(Ver%201.0.0).pdf > datasheets.maxim-ic.com/en/ds/DS1023.pdf On Sat, Mar 31, 2012 at 3:48 PM, Azelio Boriani wrote: > You can use a digital delay line to correct in hardware the PPS. The > method is illustrated in the usual .

Re: [time-nuts] 1 pps correction

You can use a digital delay line to correct in hardware the PPS. The method is illustrated in the usual .PDF I always recommend: www.gpstime.com/files/tow-time2001.pdf On Sat, Mar 31, 2012 at 3:26 PM, Martyn Smith wrote: > Hello, > > I’m a bit new to GPS receivers. I’m reading all about sawtoo

Re: [time-nuts] CW12-TIM vs M12M and the world

t; > > of +/-25ns is not its standard deviation, it's max/min. > > Compare that > > > number to your 30ns max/min measurement on the 5372a. > > > > > > Standard deviation of the m12+ is around 2ns with > correction. That > > > needs to be compared

Re: [time-nuts] CW12-TIM vs M12M and the world

> > > number to your 30ns max/min measurement on the 5372a. > > > > > > Standard deviation of the m12+ is around 2ns with correction. That > > > needs to be compared to the 5ns you measure on the 5372a as that is > > > the best performance you will ge

Re: [time-nuts] CW12-TIM vs M12M and the world

Actually I don't have a good reference (Z3815A): I'm still preparing my first disciplined Rb and have 2 Fluke PM6681s. I'm waiting for my SR620, it should be on its way to Italy right now. I have 2 TBolts but not yet turned on. What kind of reference have you used? On Fri, Mar 30, 2012 at 8:10 PM,

Re: [time-nuts] CW12-TIM vs M12M and the world

Yes, it is: the CW12 has the PPS derived from the 100MHz clock and that's why you have that PPS granularity with no need for a sawtooth correction. On Thu, Mar 29, 2012 at 7:18 PM, paul swed wrote: > OK been only slightly paying attention. > But I see in the US several sellers for a operational

Re: [time-nuts] CW12-TIM vs M12M and the world

We (that is my company) use the CW12-TIM (NMEA version) and its PPS wonders as usual, nothing different from a uBlox LEA-5T or the M12M. On Thu, Mar 29, 2012 at 9:32 AM, Hal Murray wrote: > > >> The sawtooth error on the Motorola M12+ is about +/- 25ns, while the > >> CW12-TIM has a sawtooth err

Re: [time-nuts] Best reason

Yes, and moreover: what kind of test can be done on that DC source if no DMM is able to show that accuracy? On Thu, Mar 29, 2012 at 9:53 AM, David C. Partridge < david.partri...@perdrix.co.uk> wrote: > >I'm currently have to convince management that our 6-1/2 DMM (0.01% > uncertainty) can't be us

Re: [time-nuts] Best reason

Usually (and unfortunately) governments tend to gather more money from tax rather than giving up something (Italy docet). On Wed, Mar 28, 2012 at 11:39 AM, Attila Kinali wrote: > On Wed, 28 Mar 2012 19:28:20 +1100 > Jim Palfreyman wrote: > > > Why do we need really accurate clocks? > > Accurate

Re: [time-nuts] LEA-6T Group buy

Yes, there is a 150EUR minimum value for the custom duties but nevertheless we have to pay the 21% VAT here in Italy. On Tue, Mar 27, 2012 at 9:26 AM, Attila Kinali wrote: > On Mon, 26 Mar 2012 22:30:40 +0200 > Azelio Boriani wrote: > > > 120CHF + the custom duties. Even if in

Re: [time-nuts] LEA-6T Group buy

Sorry, I meant "even if the recipient is in the EU". Interesting the proposed use of the LEA-6T time stamping... On Mon, Mar 26, 2012 at 11:10 PM, Dennis Ferguson < dennis.c.fergu...@gmail.com> wrote: > > On 26 Mar, 2012, at 12:56 , Chris Albertson wrote: > > On Mon, Mar 26, 2012 at 12:50 PM, Att

Re: [time-nuts] Basic question re adev measurements

A frequency offset is allowed but must stay the same for the entire measurement. On Mon, Mar 26, 2012 at 11:07 PM, Mark Spencer wrote: > Greetings, I was reviewing some older adev plots of mine and noticed that > there may be a correlation between lower adev numbers and lower frequency > off set

Re: [time-nuts] LEA-6T Group buy

120CHF + the custom duties. Even if in the EU. On Mon, Mar 26, 2012 at 10:08 PM, Bill Riches wrote: > > http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_DataSheet_%28GPS.G > 6-HW-09004%29.pdf > > Regards, > > Bill Riches, WA2DVU > Cape May, NJ > > - > > I have not been able to locate

Re: [time-nuts] TBolt-PRS10

Upgrade to a TBolt from what? If you have a M12+ disciplined PRS10 what else can be better? Great short time stability given by the Rb (and what a Rb, a Stanford Research PRS10), great long term accuracy given by the M12+... On Sat, Mar 24, 2012 at 8:22 PM, Jürg Kögel wrote: > Having a M12+Timin

Re: [time-nuts] Anyone familiar with SR-620 repair?

In my opinion, if you are hunting for a short, there is a little to do with the current: it is always the same, better use a voltmeter/millivoltmeter and hunt for the least voltage across capacitors or the greatest voltage drop on traces... On Fri, Mar 23, 2012 at 11:36 PM, Geoff Blake wrote: >

Re: [time-nuts] CW12-TIM

TIme ago there was a notice on the CW12 with the binary protocol firmware, the one that emulates the M12. On Fri, Mar 23, 2012 at 10:16 PM, Tom Knox wrote: > > Hi Group; > Has anyone played with the CW12-TIM? I am hoping it is a plug and play > replacement for the M12+ in my Commsync II with bet

Re: [time-nuts] Frequency Counter Errors

Yes, first try the Rb with their internal timebases. Got the PRS10? Nice Rb reference: I had one (brand new) last month for only one week... On Thu, Mar 22, 2012 at 1:11 AM, jmfranke wrote: > First, try counting the Rd reference frequency output. If one reads right > you are halfway to solving t

Re: [time-nuts] broadband MPX signal stereo

12 +0100 > schrieb Azelio Boriani : > > > Yes, there is people who have what in the past was expensive test > > equipment and now can be bought by 1/10 of the original price. The > > problem is that you need someone who can record 2 seconds of a signal > > that is slightly

Re: [time-nuts] Temex LPFRS-01

nk and > worked fine from day one. > > I've been contemplating building a system to periodically adjust the > frequency and I want a second working unit before I put any time and effort > into sorting out a pic tic micro controller solution. > > Please excuse typos and top

Re: [time-nuts] Temex LPFRS-01

it at 80C with good air flow for > 24 hours. It still may rust, but > most of the guck from the water will be gone. > > I once spent a lot of quality time with many truck loads of flood damaged > gear > > Bob > > > > On Mar 17, 2012, at 10:10 AM, Azelio Boriani

Re: [time-nuts] Neutrinos not faster than light

OK, thank you for the information. On Sat, Mar 17, 2012 at 2:21 PM, Javier Serrano < javier.serrano.par...@gmail.com> wrote: > On Fri, Mar 16, 2012 at 11:44 PM, Javier Herrero > wrote: > > Hello, > > Javier Serrano can confirm it for sure, but I think that the article with > > the OPERA results

Re: [time-nuts] FE5680A

Wow, no limits on the reverse engineering capabilities of this group... amazing, now where is Elio? He must be interested in this. [I have no FE5680A but followed the heavy posting about it, I prefer the LPFRS Rb] On Sat, Mar 17, 2012 at 2:12 PM, J. L. Trantham wrote: > Rich, > > I would love to

Re: [time-nuts] Temex LPFRS-01

LPFRS from fluke.l? OK, then open it up and clean it, the LPFRS from fluke.l suffers from high humidity/water immersion and usually are very rusty inside. I have received one that was very bad but after cleaning with tetrachloroethylene (translated with google) it is working properly, maybe it will

Re: [time-nuts] Neutrinos not faster than light

> > > Javier > > > > > > El 16/03/2012 21:50, Javier Herrero escribió: > > > > > > I think that this is the article: http://arxiv.org/pdf/1110.3763.pdf > > >> > > >> It is not strange that the results are available now. These > expe

Re: [time-nuts] Neutrinos not faster than light

g months, and generates a large quantity of data. >> >> Best regards, >> >> Javier >> >> El 16/03/2012 21:19, Azelio Boriani escribió: >> >>> OK, that is, are they telling us that for an experiment concluded in >>> 9/2011 >>> the re

Re: [time-nuts] Neutrinos not faster than light

OK, that is, are they telling us that for an experiment concluded in 9/2011 the results are available today? On Fri, Mar 16, 2012 at 8:30 PM, Hal Murray wrote: > Announcement from CERN: > > ICARUS experiment at Gran Sasso laboratory reports new measurement of > neutrino time of flight consistent

Re: [time-nuts] broadband MPX signal stereo

Interesting the ESI sound card, I'll check where to buy one. Useful to sample VLF time and frequency signals directly. On Fri, Mar 16, 2012 at 7:26 AM, Dave Brown wrote: > EMU 0202 or 2020? I know what an 0202 is but what is a 2020? > DaveB,NZ > > - Original Message - From: "Demian Marti

Re: [time-nuts] WWVB BPSK Receiver Project?

PHK, I'm interested in your circular averaging buffer: suppose 1K long, the 1st sample goes into position 0, the 2nd into 1 ... the 1000th into 999 or, the 1st gets scaled and then summed with that already present in position 0 then the result back in position 0? And so on, of course, for position

Re: [time-nuts] broadband MPX signal stereo

3GHz with the full options fitted and the companion recorder/player for 200K euros, the file produced are not PC compatible, of course. On Thu, Mar 15, 2012 at 8:31 PM, Chris Albertson wrote: > On Thu, Mar 15, 2012 at 3:56 AM, Azelio Boriani > wrote: > > Are you sure that a .WAV file

Re: [time-nuts] broadband MPX signal stereo

Are you sure that a .WAV file can support the full MPX stereo and RDS signal? I suspect that you need raw samples that a sound card can't handle. The output of a FM stereo and RDS radio discriminator are beyond the usual audio bandwidth. The output of the discriminator full bandwidth is first used

Re: [time-nuts] WWVB BPSK Receiver Project?

The first move will be to familiarize with this new modulation format. Of course I can't receive the WWVB but the DCF77 maybe a good test for me. On Wed, Mar 14, 2012 at 11:08 PM, Brooke Clarke wrote: > Hi: > > I sure would like a WWVB BPSK receiver for the new modulation. The > processing gain

Re: [time-nuts] typical phase nosie and ADEV plot of an OCXO

And don't forget the usual PDF http://gpstime.com/files/tow-time2011.pdfwhere you can find the comparison of typical Allan Deviations from various clocks on page 7. On Wed, Mar 14, 2012 at 1:52 PM, John Ackermann N8UR wrote: > On 3/14/2012 6:22 AM, Attila Kinali wrote: > >> Hi, >> >> I'm current

Re: [time-nuts] New to the list

Hi George, welcome aboard. If you are a beginner about time and frequency don't forget to get and read what was pointed out to be our introduction to the subject http://gpstime.com/files/tow-time2011.pdf written by Tom Clark and Rick Hambly. On Wed, Mar 14, 2012 at 5:27 AM, Bill Hawkins wrote: >

Re: [time-nuts] Possible replacement for FE5680A

On 3/12/12 2:20 AM, Azelio Boriani wrote: > >> Yes, build three and compare them but your comparator has to have a very >> low noise floor. I think that in addition to building new higher precision >> clocks you need to build new lower noise TI counters. >> >> &g

Re: [time-nuts] Possible replacement for FE5680A

Yes, build three and compare them but your comparator has to have a very low noise floor. I think that in addition to building new higher precision clocks you need to build new lower noise TI counters. On Sun, Mar 11, 2012 at 1:10 AM, Jim Lux wrote: > On 3/10/12 2:42 PM, Azelio Boriani wr

Re: [time-nuts] Possible replacement for FE5680A

Amazing, 10 at -19... will it ever be measurable? On Sat, Mar 10, 2012 at 10:02 PM, Attila Kinali wrote: > On Fri, 9 Mar 2012 15:29:39 +0800 > Roger Costello wrote: > > > I noticed this which could potentially be a very good thing. > > > > > https://newsroom.unsw.edu.au/news/science/nuclear-clo

Re: [time-nuts] DIY GPS-DO

0, 2012 at 4:17 PM, Attila Kinali wrote: > Ciao! > > On Sat, 10 Mar 2012 16:11:05 +0100 > Azelio Boriani wrote: > > > Interesting, as usual, the references by Attila: I'm searching for the > book > > by Roland E. Best. > > What do you mean by searching

Re: [time-nuts] DIY GPS-DO

Ah, yes, now I see: you suggest to keep track of the FOM and DOP from message #21 and move the oscillator to minimize them. Interesting and doable. Interesting, as usual, the references by Attila: I'm searching for the book by Roland E. Best. On Sat, Mar 10, 2012 at 3:59 PM, Attila Kinali wrote:

Re: [time-nuts] Agilent 53230A Counter

gt; > Total > $9044.55 > > Sounds very nice but out of my range. I guess I'll stick with my 'vintage' > HP and EIP stuff. > > Joe > > > -Original Message- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf O

Re: [time-nuts] Agilent 53230A Counter

Fantastic, and where can we find a non-overpriced Agilent 53230A? On Sat, Mar 10, 2012 at 3:12 PM, Adrian wrote: > Hello, > > just wondering if anyone has tried the new Agilent 53230A counter? > > 20 ps single shot TI resolution and the graphical display makes it look > like a much better deal t

Re: [time-nuts] DIY GPS-DO

Sure it is message ID #21 to be looked for? On Sat, Mar 10, 2012 at 2:54 PM, Magnus Danielson < mag...@rubidium.dyndns.org> wrote: > On 03/10/2012 02:38 PM, Filip Ozimek wrote: > >> >> It's an old novatel SUPERSTAR II. >> > > It's not hard to hook up a more stable 10 MHz oscillator to the Novatel

Re: [time-nuts] DIY GPS-DO

Yes, the use of the PPS as a disciplining reference was discussed weeks ago. It was debated whether an analog filtering/interpolation would do or a digital one is mandatory. The question is, in my opinion, still open and, in my opinion again, it can be done in the analog domain if a high precision/

Re: [time-nuts] MicroLogic ML200 Loran-C

Found very little googling for this ML200, found only a line in the 1977 Radionavigation Journal... On Thu, Mar 8, 2012 at 12:36 AM, Poul-Henning Kamp wrote: > > I picked up a MicroLogic ML200 Loran-C a long time ago, and after playing > a bit with it, shelved it, as not really usable for time-nu

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