Re: [time-nuts] Tektronix FCA3103 ADEV measurement tau setting problem

2018-05-28 Thread Azelio Boriani
The now freely available Stable32 has Hadamard, overlap Hadamard, Hadamard total. On Mon, May 28, 2018 at 9:17 PM, Richard (Rick) Karlquist wrote: > I have a Tek FCA3103 300 MHz counter that measures ADEV > as a built in function. When I bring up the settings > menu for the measurement, it has

Re: [time-nuts] Antenna cable delay compensation

2018-05-22 Thread Azelio Boriani
In the uBlox protocol specifications there is an antCableDelay, an rfGroupDelay, a userConfigDelay, all are 2's complement quantities, no bounds given in the manual. On Tue, May 22, 2018 at 4:55 AM, Mark Sims wrote: > A related question is: Do you use positive or negative

Re: [time-nuts] Improving ocxo temp control

2018-05-21 Thread Azelio Boriani
First, be sure not to measure your HP52132A stability with the OCXO. What is your reference source? On Mon, May 21, 2018 at 7:12 PM, Bob kb8tq wrote: > Hi > > There are a lot of reasons an OCXO drifts. Temperature control is rarely the > issue. > More likely you are looking at

Re: [time-nuts] lecture on PLL and phase noise and verilog

2018-05-15 Thread Azelio Boriani
Maybe that such a technique can be applied to the simulation of counters and interpolators, an actual topic on this list. On Mon, May 14, 2018 at 2:47 PM, jimlux wrote: > If you're in California southern Central Coast area (Ventura, Santa Barbara, > Thousand Oaks, etc.) the

Re: [time-nuts] GPS Timing Antenna Failure - Long

2018-05-13 Thread Azelio Boriani
Usually GPS antennas are patch antennas. The PROCOM GPS4 (I have 2 of them) should be a real QFH (I haven't opened it to verify), the Vaisala radiosonde RS92 has a real QFH. The Sarantel SL series seem is a double helix not a classic QFH with the two different-size loops. They name their series

Re: [time-nuts] Question about frequency counter testing

2018-04-27 Thread Azelio Boriani
27, 2018 at 4:32 PM, Azelio Boriani <azelio.bori...@gmail.com> wrote: > Yes, this is the problem when trying to enhance the resolution from a > low one-shot resolution. Averaging 2.5ns resolution samples can give > data only if clocks move one with respect to the other and "

Re: [time-nuts] Question about frequency counter testing

2018-04-27 Thread Azelio Boriani
Yes, this is the problem when trying to enhance the resolution from a low one-shot resolution. Averaging 2.5ns resolution samples can give data only if clocks move one with respect to the other and "cross the boundary" of the 2.5ns sampling interval. You can measure your clocks down to the ps

Re: [time-nuts] Question about frequency counter testing

2018-04-26 Thread Azelio Boriani
.. > > Bob > >> On Apr 26, 2018, at 3:06 AM, Azelio Boriani <azelio.bori...@gmail.com> wrote: >> >> Very fast time-stamping like a stable 5GHz counter? The resolution of >> a 200ps (one shot) interpolator can be replaced by a 5GHz >> time-stamping counte

Re: [time-nuts] Question about frequency counter testing

2018-04-26 Thread Azelio Boriani
Very fast time-stamping like a stable 5GHz counter? The resolution of a 200ps (one shot) interpolator can be replaced by a 5GHz time-stamping counter. On Thu, Apr 26, 2018 at 12:28 AM, Bob kb8tq wrote: > Hi > > Unfortunately there is no “quick and dirty” way to come up with an

Re: [time-nuts] GPS coordinate differences between APRS.FI and Google Maps

2018-04-20 Thread Azelio Boriani
aprs.fi uses google maps... have you taken a look to your raw packets? On Sat, Apr 21, 2018 at 12:34 AM, Scott McGrath wrote: > DATUM perhaps? > > Content by Scott > Typos by Siri > > On Apr 20, 2018, at 5:20 PM, Russ Ramirez wrote: > > This has

Re: [time-nuts] Weird Stuff Warehouse shutting down

2018-04-08 Thread Azelio Boriani
For those of us (like me) that can travel to the US less than once in a lifetime, there is an EEVblog #124 - A Tour of Apex Electronics: On Sun, Apr 8, 2018 at 2:25 AM, Alexander Pummer wrote: > other surplus: >

Re: [time-nuts] Meinberg (Rode & Schwartz), ED170MP GPS Receiver

2018-04-08 Thread Azelio Boriani
I think you can use the GPSMON32 with the ED170 I have an ED167MP, it works only with its downconverter antenna and the rear panel has 2 serial ports and a network connection (a Lantronix serial_port/telnet adapter, a

Re: [time-nuts] TS2100: List of root commands?

2018-04-05 Thread Azelio Boriani
Try this: On Thu, Apr 5, 2018 at 2:29 AM, Bruce Lane wrote: > Fellow time-tickers, > > I just finished conversion of one of my TS2100's to OCXO, and I'm now > in the process of tweaking the

Re: [time-nuts] GPS ANTENNA

2018-04-01 Thread Azelio Boriani
An unusual attenuator with a DC pass. On Sun, Apr 1, 2018 at 10:21 PM, David C. Partridge wrote: > Or use a choke ring survey antenna and an attenuator :) > > Dave > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob

Re: [time-nuts] WWVB Antenna revisited/Spectracom 8182

2018-03-23 Thread Azelio Boriani
The AM modulation stuff is not affected also by the new WWVB signal. The WWVB problem affecting timing and frequency receivers is the 180deg phase modulation where the DFC77 is only 13deg and is randomized so that the mean phase is zero. On Fri, Mar 23, 2018 at 10:35 AM, Martin Burnicki

Re: [time-nuts] Replacement A9 boards for the HP 5065A

2018-02-25 Thread Azelio Boriani
The part number BFC234421475, on seems to be a Philips product, 2500 available, for 49.28 UAH (Ukrainian Hryvnia, that is 1.77 USD). A mysterious capacitor... On Sun, Feb 25, 2018 at 12:35 PM, Charles Steinmetz wrote: > Interesting.

Re: [time-nuts] Furuno GT-8031 breakout board

2018-02-15 Thread Azelio Boriani
I see that Buerklin has also complete GPSDOs from Furuno, the GF-8701 seems the entry level model for 291 eur. On Thu, Feb 15, 2018 at 7:55 PM, Bob Darlington wrote: > I bought some of the Furuno GT-8736 boards for $35 a pop, qty 1 (or 2 as > was the case). And was quoted

Re: [time-nuts] Does a frequency counter locked to GPS need to "warm up"?

2018-02-08 Thread Azelio Boriani
No warmup needed if the counter switches to the external reference. If the counter uses the external reference to lock the internal one then it is better to wait until the internal one is stable, maybe the counter has a standby mode where it appears powered off but the internal reference is active

Re: [time-nuts] GPS Jamming

2018-01-29 Thread Azelio Boriani
Wasn't the selective availability an accuracy degradation system? On Mon, Jan 29, 2018 at 10:55 AM, Adrian Godwin wrote: > What a pity nobody thought to include an accuracy degradation system into > GPS itself, for use when you don't want the enemy to benefit from it. > >

Re: [time-nuts] PBS, Tue evening, The Secret of Tuxedo Park

2018-01-16 Thread Azelio Boriani
>>...he would wear it on the outside of his wrist instead of the inside, so >>that gravity changed the rate of the tuning fork... Sort of manual turbillon... On Tue, Jan 16, 2018 at 4:04 PM, Tom Van Baak wrote: > I can't stress enough how important Loomis was to the history

Re: [time-nuts] Oscilloquartz OSA-4350 GPSDO

2017-12-31 Thread Azelio Boriani
The GPS receiver featured in the picture at is a Motorola UT+. My OSA4351 has a Motorola GPS receiver. On Sun, Dec 31, 2017 at 7:43 PM, Gregory Beat wrote: > Oscilloquartz OSA-4530 GPSDO : 2-page product brochure >

Re: [time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

2017-12-10 Thread Azelio Boriani
Is that a Trimble Thunderbolt? Is there a way to compute the uncertainties? On Sun, Dec 10, 2017 at 2:42 AM, Tom Holmes wrote: > Mark... > You're place really moved a foot in 48 hours? Impressive and scary! > > From Tom Holmes, N8ZM > >> On Dec 9, 2017, at 8:19 PM, Mark Sims

Re: [time-nuts] Next upgrade

2017-11-26 Thread Azelio Boriani
1024 of the total range before > you must tune the coarse dac. Even with a good set of parts, you *will* be > doing coarse tuning. > > Bob > >> On Nov 26, 2017, at 12:13 PM, Azelio Boriani <azelio.bori...@gmail.com> >> wrote: >> >> Is summing a &quo

Re: [time-nuts] Next upgrade

2017-11-26 Thread Azelio Boriani
Is summing a "fine tune" 16bit DAC and a "coarse tune" 16bit (or less) DAC with an op-amp not good enough? On Sun, Nov 26, 2017 at 5:53 PM, Bob kb8tq wrote: > Hi > > Each time I’ve tried the method in the app note, there has been a tone in the > output > spectrum at the sample

Re: [time-nuts] Time and frequency practical exercise 2018 late quarter; precision measure of 432mhz band Sat in Lunar Orbit

2017-11-17 Thread Azelio Boriani
With 197dB of path attenuation and, say, 1W or 2W of transmitter power, I think that a modest antenna is insufficient. The usual yagi array for this distance is made by 8 27-element antennas like this: On Sat, Nov 18, 2017 at 12:54 AM, Bob kb8tq

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

2017-11-16 Thread Azelio Boriani
ng at GPSDO’s or GPS modules is to use the >>> “cable delay” setting. It will allow you to move the pps of one unit >>> relative to the pps of the other one. You then can be sure of which pps >>> happens first. That makes the A to B measurement much easier to analyze. >

Re: [time-nuts] Interpreting and Understanding Allen Deviation Results

2017-11-16 Thread Azelio Boriani
As already stated here, the best measurement mode is the time-interval mode. The 5335A is a 2ns single-shot resolution counter. Use the PPS output from the GPSDO, route it to the A (start) input and to a coaxial cable used as a delay line (10m, 50ns, should be enough). The other end of the cable

Re: [time-nuts] OCXO Vectron 218Y44442

2017-10-17 Thread Azelio Boriani
The crystal is socketed: the problem might be the socket. On Tue, Oct 17, 2017 at 1:56 AM, Bob kb8tq wrote: > Hi > > Welcome to the 1990’s … that’s an *old* design. Since Vectron kept building > same / same > (if you ordered it that way) who knows when it was built. > > Bob > >>

Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time

2017-10-11 Thread Azelio Boriani
For those who are in Europe there is the PTB (Physikalisch-Technische Bundesanstalt, the German Federal institute of Physics and Technology) service to check the PC's time: On Wed, Oct 11, 2017 at 5:25 PM, Mike Cook wrote: > I have Win7-64 and my LH and

Re: [time-nuts] Weird GPSDO behavior - update

2017-10-04 Thread Azelio Boriani
Very interesting: can you flash the firmware? I'm aware (until now) that there is no firmware around and no firmware flashing tool for these GPSes. Maybe the flashing tool(s) is(are) suitable for the Thunderbolt too. On Wed, Oct 4, 2017 at 10:58 AM, robkimberley

Re: [time-nuts] Fw: Skytraq / GPS Almanac

2017-09-27 Thread Azelio Boriani
Maybe this can be useful: On Wed, Sep 27, 2017 at 5:58 AM, Scott Newell wrote: > At 05:20 PM 9/26/2017, Tom Van Baak wrote: >> >> An interesting note from Said, below... >> I've sent a couple of

Re: [time-nuts] DAC performance [WAS: Papers on timing for lunar laser ranging]

2017-07-17 Thread Azelio Boriani
This implies that in a Rb or Cs there is not a voltage reference source? On Mon, Jul 17, 2017 at 3:49 AM, Bob kb8tq wrote: > HI > > This is a limitation on an OCXO based GPSDO. That’s really the bottom line > here. > It’s a limitation in an OCXO based part, but not in one based

Re: [time-nuts] WWVB & Eclipse

2017-07-13 Thread Azelio Boriani
Also DGPS stations logging: On Thu, Jul 13, 2017 at 10:35 PM, Brooke Clarke wrote: > Hi: > > There's a massive experiment relating to the strength of WWVB and a > transmitter in Dixon California. > >

Re: [time-nuts] Fluke PM6681 'fault' or 'characteristic'?

2017-05-30 Thread Azelio Boriani
The assumption is that you are using the time interval measurement or phase measurement. The PM6681 datasheet says that the time interval range is from 0ns and the phase range from -180 to 360 deg, usually it is best to avoid the zero degrees zone. Say that your test is another evidence that

Re: [time-nuts] Network Time Foundation

2017-05-13 Thread Azelio Boriani
Is the Network Time foundation the only one to have the NTP source code? Is the Meinberg code (for example) a different one? On Sat, May 13, 2017 at 1:02 PM, Magnus Danielson wrote: > Fellow time-nuts, > > As I came back home from my NYC trip, I found a nice little

Re: [time-nuts] E1938 info regarding LEDs, push button switch and EFC voltage notation

2017-05-11 Thread Azelio Boriani
You can find schematics and various info here: On Thu, May 11, 2017 at 3:47 PM, James Robbins wrote: > 1. I have just acquired an E1938 and

Re: [time-nuts] Frequency counter questions

2017-04-23 Thread Azelio Boriani
Up to the point that, to get 1milliHz resolution, you have to wait 1000 seconds (without the prescaler)? If you have a prescaler then it will be N*1000 seconds... On Sun, Apr 23, 2017 at 9:14 AM, Jerry Hancock wrote: > Hello, I would like to find a person that would be able to

Re: [time-nuts] phase/frequency data of real atomic clocks

2017-03-02 Thread Azelio Boriani
These data fles? ftp://ftp2.bipm.org/pub/tai/data/2017/clocks/ every 5 days... On Thu, Mar 2, 2017 at 12:18 AM, Magnus Danielson wrote: > Hi, > > Have you considered the BIPM logs? > While not very high sampling rate, it has lots of clocks over long time. > > Time to

Re: [time-nuts] advice

2017-02-22 Thread Azelio Boriani
Does gravity work differently under the surface? Maybe the redshift is different going below the surface. On Wed, Feb 22, 2017 at 3:22 AM, Bill Hawkins wrote: > In the confusion, I forgot that we are concerned with gravitational time >

Re: [time-nuts] Vintage Frequency Measurement

2017-02-15 Thread Azelio Boriani
1960's frequency counters using a counting tube E1T different from the usual dekatron On Wed, Feb 15, 2017 at

Re: [time-nuts] Lost Calibration on CNT-81/PM-6681

2017-02-01 Thread Azelio Boriani
It seems that "normal mode" is not a mode: from the operator's manual: SINGLE When on, the result from each measurement is displayed. When off, the counter averages all data captured during the set measurement time. No normal mode but single mode on or off. The measurments look better when

Re: [time-nuts] Allan Variance with an HP53132a counter

2017-01-22 Thread Azelio Boriani
You don't need the OCXO option for the 53132... you need a stable and accurate source like a GPSDO that will be your reference. Consider buying the HP53132 but also a GPSDO. Is the 162kHz transmitter the Allouis one (TDF/Syrte)? On Sun, Jan 22, 2017 at 3:52 PM, Gilles Clement

Re: [time-nuts] Thermal effects on cables --> ADEV

2017-01-14 Thread Azelio Boriani
May I suggest to turn the 24 hours reset period into a parameter? On Fri, Jan 13, 2017 at 8:45 PM, Tom Van Baak wrote: > Mark, Ole, > > Yes, averaging can both enhance precision but also destroy information. In > many cases too much data is a bad thing. The solution is to

Re: [time-nuts] MTI 240 OCXO, anyone?

2017-01-02 Thread Azelio Boriani
An Oscilloquartz 8660 is its equivalent... OK, slightly worse. On Mon, Jan 2, 2017 at 12:05 AM, Bruce Lane wrote: > Happy New Year, fellow time-tickers! > > Would anyone happen to have a spare MTI 240 series OCXO, 10MHz output? > I'm looking to upgrade my

Re: [time-nuts] A Leap Second is coming

2016-12-30 Thread Azelio Boriani
The leap second warning is present in the PTB clock too (Europe): On Fri, Dec 30, 2016 at 8:49 PM, Nick Sayer via time-nuts wrote: > I'm going to definitely observe my GPS clock to check its behavior. It > *should* repeat second zero (in my case of 4PM

Re: [time-nuts] SR620 Failure Code.

2016-12-22 Thread Azelio Boriani
Here you can find all about the SR620: search for SR620. On Thu, Dec 22, 2016 at 5:53 PM, W2GPS wrote: > Time-nuts, > > > > My SR620 has started reporting "test error 34" on power-up and will do > nothing after that. Does

Re: [time-nuts] Lady Heather Version 5 is now available

2016-12-12 Thread Azelio Boriani
Maybe that the "Start In" field in the Properties Panel must be set if windows is not in US language mode. When windows is italian, for example, the Program Files folder becomes Programmi. On Mon, Dec 12, 2016 at 9:53 AM, David J Taylor wrote: > Hello Mark, > >

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

2016-11-21 Thread Azelio Boriani
A comparison between AT and SC cuts' temperature stability can be found here: On Mon, Nov 21, 2016 at 4:21 AM, Bob Camp wrote: > Hi > > If the frequency drops as the oven warms up, you have an AT cut crystal. If > the frequency

Re: [time-nuts] Thermal impact on OCXO

2016-11-19 Thread Azelio Boriani
Are Oscilloquartz's Star-4 commands described somewhere? I can't find them in the wild... On Sat, Nov 19, 2016 at 4:34 AM, Mark Sims wrote: > Several years ago I replaced the OCXOs in some Tektronix DC5010 counters with > surplus Oscilloquartz 8663 DOCXOs. The darn things

Re: [time-nuts] Thermal impact on OCXO

2016-11-18 Thread Azelio Boriani
One starting point to figure out the 10 years aging can be the datasheet of an OCXO: MTI240: per year, 3.0E-7, in 10 years must be less than 30.0E-7 MTI220: per year, 1.0E-6, in 10 years < 10.0E-6 Bliley NV26R: 17 years, 5.0E-6 OSA8663: per year, 3.0E-8, in 10 years < 30.0E-8 On Fri, Nov 18, 2016

Re: [time-nuts] Time nut soon to be in Shenzhen

2016-11-06 Thread Azelio Boriani
Maybe I have a clue: on the usual auction site there is a new seller (since April 2015) from ShenZhen (Guangdong provice) that has a lot of OCXOs on sale. Not so far (~140km) there is another OCXOs seller (since 2005) in Guangzhou, the capital of Guangdong province. On Sun, Nov 6, 2016 at 4:43

Re: [time-nuts] Thermal impact on OCXO

2016-11-05 Thread Azelio Boriani
...with a 20bit DAC, a suitable voltage reference for that DAC and an HP3458... On Sun, Nov 6, 2016 at 12:39 AM, Bob Stewart wrote: > Hi Hal, > > With a 20 bit DAC, even a small aging rate is going to show up. I'll let the > one GPSDO cook for a month or so and see what it

Re: [time-nuts] TimeLab

2016-10-09 Thread Azelio Boriani
In the real world of TICs is not possible to implement a stop pulse that occurs before its start pulse. When a regular start-stop (stop pulse after start, positive delay) is followed by a negative delay (stop pulse before the start) the sample is lost because the start has not yet occurred. The

Re: [time-nuts] Normal operating specs of a Morion MV89?

2016-09-28 Thread Azelio Boriani
Take care that the 'scope is not a 50 ohm load: the TDS2024B has not the 50ohm/1Mohm input selection. So far I wasn't able to get from the 'scope FFT the same measurements that I get from a spectrum analyzer. On Wed, Sep 28, 2016 at 7:38 AM, Tim Lister wrote: > On Tue, Sep

Re: [time-nuts] Lucent RFTFm-II-XO

2016-09-22 Thread Azelio Boriani
This is your link: anyway, the J8 connector pinout: KS-24361 J8 - Diagnostic serial port with SCPI 9600,N,8,1 RXD+ 4 RXD- 8 TXD+ 5 TXD- 9 GND 3, 7 J6 RS422/PPS RXD+ 4 RXD- 8 no information on this RX line TXD+ 5 TXD- 9

Re: [time-nuts] Holdover

2016-08-17 Thread Azelio Boriani
...the Z3801A requires the device to be in holdover... with the GPS PPS already acquired: I think that the "jam sync" must be done against some reference... On Wed, Aug 17, 2016 at 4:49 AM, Mark Sims wrote: > The Trimble GPSDOs and most of the SCPI ones (like the Z3801A) have

Re: [time-nuts] Q/noise of Earth as an oscillator

2016-07-29 Thread Azelio Boriani
What about an ADEV/TDEV plot of the pulsar J0437-4715? On Fri, Jul 29, 2016 at 12:39 AM, Jim Palfreyman wrote: > Hi All, > > Tom gave me a nudge to look here - I hadn't been following this thread. > > For those that don't know, I study pulsars and so the way we measure what >

Re: [time-nuts] Q/noise of Earth as an oscillator

2016-07-27 Thread Azelio Boriani
Exciting the Earth with a new frequency (and an adeguate amount of energy) sets a new rotational speed: you cannot retune a (for example) quartz crystal in the same way... On Wed, Jul 27, 2016 at 3:42 PM, Tom Van Baak wrote: > Hi Michael, > > I sympathize with both your and

Re: [time-nuts] over-determined clock solution

2016-06-25 Thread Azelio Boriani
In this receiver mode all the satellites are used to compute the timing solution. See page 80 of the 2012 Thunderbolt-E manual: This mode is available when the position of the antenna is known and is stationary. Timing receivers usually

Re: [time-nuts] How to get unknown frequency quartz crystals oscillating

2016-06-05 Thread Azelio Boriani
In the July/August 2008 QEX magazine there is an article by VE5FP "Some Thoughts On Crystal Parameter Measurement" that may be of interest. On Sat, Jun 4, 2016 at 11:01 PM, Bob Camp wrote: > Hi > > There are two things you may be talking about: > > 1) The pressure springs on

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

2016-05-07 Thread Azelio Boriani
256 steps at a time and > observing that THAT is 50ish times larger than expected. I'm extrapolating > that single-stepping would move 50 times more than expected, but I have no > way of testing that. > > Sent from my iPhone > >> On May 7, 2016, at 4:26 AM, Azelio Boriani

Re: [time-nuts] FE-5680A tuning step and pre-lock stability?

2016-05-07 Thread Azelio Boriani
How can anyone of us tell wheater a tuning step is or not at the level of 10 at -15? Maybe only TVB can... Are you sure that the 50 times greater than is not related to your measure instead of the real capability of the 5680A? On Sat, May 7, 2016 at 6:51 AM, Nick Sayer via time-nuts

Re: [time-nuts] What is "accuracy"? (newbie timenut, hi folks!)

2016-05-06 Thread Azelio Boriani
For a visual feeling of what are accuracy and stability see page 6 of this PDF: On Fri, May 6, 2016 at 6:22 AM, wb6bnq wrote: > Hello Belinda, > > First off there is no such thing as

Re: [time-nuts] synchronization for telescopes

2016-05-04 Thread Azelio Boriani
AM radio in Italy (what is left) is from 525KHz to 1715KHz and the TV broadcast is now all digital, using QPSK or QAM COFDM modulation: not so easy to use as a synchronization signal. On Wed, May 4, 2016 at 7:42 PM, Chris Albertson wrote: > How to increase the SNR.

Re: [time-nuts] Optical transfer of time and frequency

2016-04-29 Thread Azelio Boriani
Yes, but I see that the allan deviation figures they cite aren't achievable with common time-nuts gear now. Considering a VLBI project: first premium stability then superb time transfer. On Fri, Apr 29, 2016 at 5:18 AM, Bruce Griffiths wrote: > Quoting Michael

Re: [time-nuts] SE880 GPSDO

2016-04-28 Thread Azelio Boriani
Here in Italy the DVB-T practice is to use GPSDOs to lock the transmitters' carriers. This is needed to exploit the Single Frequency Network (SFN) system. The frequency and time stability are stated in the ETSI TR 101 190, 8.3.1 and 8.3.2 on page 41, in short they say 1us is enough for the time

Re: [time-nuts] Oncore battery

2016-04-25 Thread Azelio Boriani
Panasonic ML621 or equivalent. Alternatively you can use the battery pin (pin 6): remove the onboard battery and use en external primary cell (CR2032 or equivalent). See pages 15 to 21 of the M12M user manual.

Re: [time-nuts] Agilent Data logger3 info request

2016-04-23 Thread Azelio Boriani
Are GNUPlot, Grace and others not suitable? You can plot a CSV data collection with virtually anything, R included. On Sat, Apr 23, 2016 at 4:15 PM, wrote: > > I have an Agilent 34970A data logger. It use the "Bencklink Data Logger3" as > software. > > I would like to capture

Re: [time-nuts] Lea-6T Math error?

2016-04-15 Thread Azelio Boriani
Did you use the CFG-TMODE svinVarLimit to set 350 and the svinMinDur to set 32400? The CFG-TMODE svinVarLimit is a variance in squared mm, not a standard deviation... On Fri, Apr 15, 2016 at 6:27 AM, Bob Stewart wrote: > I hope I haven't posted about this before, but it's

Re: [time-nuts] Lea-6T Math error?

2016-04-15 Thread Azelio Boriani
Yes, I see: the fixedPosAcc should be 18mm not 122. On Fri, Apr 15, 2016 at 12:15 PM, Azelio Boriani <azelio.bori...@gmail.com> wrote: > Did you use the CFG-TMODE svinVarLimit to set 350 and the svinMinDur > to set 32400? > The CFG-TMODE svinVarLimit is a variance in squared mm,

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Azelio Boriani
Yes, very interesting, good to have. I see differences: the most notable is the plot of page 12 on the original italian version that is missing on the ITU paper, that goes with the figure 4 on page 7 (of the ITU one). On Tue, Apr 5, 2016 at 12:57 AM, Magnus Danielson

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Azelio Boriani
The only english text I'm able to find is: Analysis of the GPS frequency reference stability Laboratory analysis of the dynamic behaviour of some GPS receivers has allowed to identify a criticality in their use as ‘clocks’ to synchronize DVB-T SFN networks. To fix this criticality, the Research

Re: [time-nuts] Holdover recovery

2016-04-04 Thread Azelio Boriani
In italian: Can't find it in english... On Mon, Apr 4, 2016 at 9:28 PM, Magnus Danielson wrote: > Hi Hal, > > On 04/04/2016 05:39 AM, Hal Murray wrote: >> >> >> Has anybody studied what happens when a GPSDO comes out of

Re: [time-nuts] Cheap GPSDO's

2016-02-11 Thread Azelio Boriani
The last you mention is a FEI PicoSync with the even second (PP2S) output. Usually, for time-nuts purposes (and if it will be your first GPSDO), it is better to have a pulse-per-second (PPS) output, On Thu, Feb 11, 2016 at 8:13 AM, Joseph Gray wrote: > I searched the list

Re: [time-nuts] Not so cheap GPSDO's

2016-02-11 Thread Azelio Boriani
The Z3815A has the famous hockey puck OCXO designed by Rick Karlquist. I have one Z3815A from the seller you mention: it works but, inside, there was heavy rust on the Furuno GPS receiver case. The old Furuno receiver in the Z3815A has the GPS week rollover bug as all the surplus Z-series HP

Re: [time-nuts] New Member / Z3801

2016-01-17 Thread Azelio Boriani
Welcome, you hit the usual GPS week rollover issue, see these: No impact on the 10MHz/PPS accuracy. No command can correct the rollover, I seem to remember that if you set the date

Re: [time-nuts] NTBW50AA Problem

2016-01-09 Thread Azelio Boriani
If there is a problem in the RF front-end, no software can report this... actually the only way to test the radio section of a GPS receiver is to just connect it to an antenna (unless there is a GPS simulator available). On Sat, Jan 9, 2016 at 2:49 AM, Michael Bauer wrote: >

Re: [time-nuts] Problems with WinOncore12 2.1X3 and an M12+T

2016-01-03 Thread Azelio Boriani
Try this On Sun, Jan 3, 2016 at 5:19 PM, Philip Pemberton wrote: > Hi, > > I'm currently testing a Motorola M12+T receiver for possible use in a > GPS-disciplined 10MHz oscillator. At the moment, I'm using

Re: [time-nuts] Problems with WinOncore12 2.1X3 and an M12+T

2016-01-03 Thread Azelio Boriani
Or this <http://www.stratfordradiosociety.freeserve.co.uk/WinOncore12_1_2.zip> Interesting to see that there is a 2.1 version... On Sun, Jan 3, 2016 at 6:34 PM, Azelio Boriani <azelio.bori...@gmail.com> wrote: > Try this <http://www.synergy-gps.com/images/stories/Softwa

Re: [time-nuts] Mechanical clock sound pickup circuit

2015-12-13 Thread Azelio Boriani
Maybe this can be useful to make the pick-up: http://www.meas-spec.com/downloads/LDT_Series.pdf they can be found also on the usual auction site. On Sat, Dec 12, 2015 at 10:28 PM, Alexander Pummer wrote: > > Once upon the time there was a "Vibrograph", see nice pictures here:

Re: [time-nuts] GPSDO and oscillator steering - EFC vs DDS schemes?

2015-12-08 Thread Azelio Boriani
Something like good_100MHz_OCXO+DDS => same as a BVA? On Tue, Dec 8, 2015 at 5:32 PM, Attila Kinali wrote: > Moin, > > I've been digging through some stuff and stumbled (again) over Rick's > paper on high resolution, low noise DDS generation[1] and got confused. > The scheme is

Re: [time-nuts] GPSDO and oscillator steering - EFC vs DDS schemes?

2015-12-08 Thread Azelio Boriani
unstable oscillator? Or, how much unstable can be the 100MHz starting oscillator so that I can obtain after the DDS+suitable_driving_function the same final stability as an ordinary 10MHz OCXO? On Tue, Dec 8, 2015 at 6:44 PM, Azelio Boriani <azelio.bori...@gmail.com> wrote: > Somet

Re: [time-nuts] Hydrogen maser frequency jumps

2015-12-05 Thread Azelio Boriani
How are related the three locations' jumps? Do they occur at the same time? One more than the others? On Sat, Dec 5, 2015 at 11:45 AM, Poul-Henning Kamp wrote: > > In message >

Re: [time-nuts] PM6681 and Timelab (was: PM6680 or 53131A for TimePod)

2015-11-17 Thread Azelio Boriani
Not necessarily, if you follow the service manual's procedure, you can replace the backup 3V cell safely, keeping the calibration data: the problem is checking periodically the backup cell or replacing it regularly (say, every 5 years). On Tue, Nov 17, 2015 at 12:33 PM, davidh

Re: [time-nuts] PM6681 and Timelab (was: PM6680 or 53131A for TimePod)

2015-11-17 Thread Azelio Boriani
Not necessarily, if you follow the service manual's procedure, you can replace the backup 3V cell safely, keeping the calibration data: the problem is checking periodically the backup cell or replacing it regularly (say, every 5 years). On Tue, Nov 17, 2015 at 12:33 PM, davidh

Re: [time-nuts] The Pendulum Paradigm by Martin Beech, 2014

2015-10-29 Thread Azelio Boriani
Yes, but first you need a very stable pendulum clock as pointed out by TVB, a stability better than 0.05ppm for a mechanical clock is a real challenge. On Thu, Oct 29, 2015 at 12:56 PM, Jim Lux wrote: > On 10/28/15

Re: [time-nuts] GPS Crystal Frequencies

2015-10-27 Thread Azelio Boriani
Usually GPS receivers have CPU clock frequencies that are not an integer multiple of the chipping rate: that's why there is the sawtooth correction in the timing units. The LO frequency for the receiver front-end is not a problem due to the fractional-N PLL. The Motorola M12 seems to use a 40MHz

Re: [time-nuts] Rohde & Schwarz GPSDO

2015-10-08 Thread Azelio Boriani
Forgot to mention: the GPSMON32 is free <https://www.meinbergglobal.com/english/sw/#gpsmon> On Thu, Oct 8, 2015 at 3:29 PM, Azelio Boriani <azelio.bori...@gmail.com> wrote: > Here are 2 pictures of the 1U unit and the card. > > On Thu, Oct 8, 2015 at 1:05 PM, Bob Camp

Re: [time-nuts] Rohde & Schwarz GPSDO

2015-10-08 Thread Azelio Boriani
Here are 2 pictures of the 1U unit and the card. On Thu, Oct 8, 2015 at 1:05 PM, Bob Camp wrote: > Hi > > One thing you can expect - some sort of issue with the GPS rollover issue. > Can it be fixed on this or that unit? That’s going to be highly variable > model to > model. Not

Re: [time-nuts] Rohde & Schwarz GPSDO

2015-10-07 Thread Azelio Boriani
Without the necessary antenna/downconverter. On Wed, Oct 7, 2015 at 4:06 AM, Bob Benward wrote: > > > If anyone is interested, a Rohde & Schwarz GPSDO: > > > > > > Rohde & Schwarz GPS RECEIVER ED170MP MEINBERG 2105.5504.00 > > > >

Re: [time-nuts] Easy-to-use TDC to compare PPS

2015-09-15 Thread Azelio Boriani
What about the PICTIC? On Tue, Sep 15, 2015 at 4:30 PM, Xavier Bestel wrote: > Hi, > > I'd like to do some PPS comparisons on an SBC (like a Beaglebone or RPi) > using a TDC. So far the ones I've seen

Re: [time-nuts] Trimble Resolution [T, SMT, SMT GG] - spontaneous GPS loss of signal events, multiple locations

2015-09-14 Thread Azelio Boriani
Why there are distribution amps? If there are other non-Resolution receivers (co-located and driven by the same antenna/distribution amp), what are they experiencing when there is the outage reported by the Resolution boards? Less-than-usual satellite count? Poor C/N? Can you log data? On Mon,

Re: [time-nuts] HP 5730 data polling technique?

2015-09-03 Thread Azelio Boriani
The manual reports that the 5370 is SRQ capable but no example is given. Anyway, the operation is the serial_poll and read_status_byte sequence, when the status byte reports the error 0, then a measurement is complete and the result can be read. How to implement the SRQ management depends on your

Re: [time-nuts] HP 5730 data polling technique?

2015-09-02 Thread Azelio Boriani
Usually it is possible to trigger an SRQ after a measurement is completed. I'll have to read the manual for the details on how to implement this procedure. On Wed, Sep 2, 2015 at 10:31 PM, Hal Murray wrote: > > paul.alfi...@gmail.com said: >> While I can see single

Re: [time-nuts] FLL errors

2015-08-28 Thread Azelio Boriani
OK: the XOR gate with an RC is a defective PLL and a defective FLL. It is a simple way to have an idea of what an xLL should be but of no serious use. On Fri, Aug 28, 2015 at 5:03 AM, Charles Steinmetz csteinm...@yandex.com wrote: Azelio wrote: Since I have not found a strong definition for

Re: [time-nuts] FLL errors

2015-08-28 Thread Azelio Boriani
If FLL: something that links frequencies, PLL: something that links phases, frequency detector: output proportional to frequency error, phase detector: output proportional to phase error (XOR), and the original question (about FLL) was how to implement a simple FLL, can an FLL be made by a

Re: [time-nuts] Chinese GPSDO 10 MHz error

2015-08-27 Thread Azelio Boriani
The simplest form of a frequency locked loop is the XOR gate, when the driving signals are 50% square waves. To achieve lock, the phase difference will be proportional to the voltage needed to the VCO to generate the desired frequency. Start with a 5V digital gate, suppose your VCO needs 2.5V to

Re: [time-nuts] Chinese GPSDO 10 MHz error

2015-08-27 Thread Azelio Boriani
17:19:34 +0200 Azelio Boriani azelio.bori...@gmail.com wrote: The simplest form of a frequency locked loop is the XOR gate, when the driving signals are 50% square waves. To achieve lock, the phase difference will be proportional to the voltage needed to the VCO to generate the desired

Re: [time-nuts] Serial Ballpoint issue again

2015-08-11 Thread Azelio Boriani
Here you can find a solution: http://ww1.jeppesen.com/documents/support/marine/documentation/VVOS/VVOS_CrazyMouse.pdf On Tue, Aug 11, 2015 at 2:20 PM, David C. Partridge david.partri...@perdrix.co.uk wrote: I just installed Windows 10 (yes I know how rash), and now my Thunderbolt is being

Re: [time-nuts] NPR story on coupled pendulums

2015-07-30 Thread Azelio Boriani
Anti-injection locking? Christiaan Huygens first noticed the injection locking effect for pendulums hung from a common beam, maybe they anti-injection locks when on a common surface... On Wed, Jul 29, 2015 at 5:54 AM, Hal Murray hmur...@megapathdsl.net wrote: University Of Lisbon Scientists

  1   2   3   4   5   6   7   8   9   10   >