[time-nuts] Re: What about the frequency discrimination method? (offshoot from DIY PN analyzer)

How can you measure something, any type of measure, not only PN, without a reference? Voltmeters need voltage references, "timemeters" (and frequency meters) need time references. On Sun, Jul 10, 2022 at 1:47 AM ed breya via time-nuts wrote: > > I've been following the thread about Erik's DIY PN

[time-nuts] Re: looking for MITREX modem manual/documentation

>From the paper "PRESENT STATE OF LONG DISTANCE TIME TRANSFER VIA SATELLITES WITH APPLICATION OF THE MITREX - MODEM", Hartl specifies that "The PN-code is a truncated maximum length sequence of period 10.000, instead of the 16.383 chips". In the Xilinx application note XAPP052, we can find that

[time-nuts] Re: Picotest U6200A problem with measuring PPS period very second.

Without a reference? If the same PPS acts as start and as stop then one (I suppose) rising edge is start and the next rising edge is stop, so a measurement every second is not possible. Maybe a dedicated hardware with two channels where one edge is the start for a channel and stop for the other is

[time-nuts] Re: Testing a GPS mag mount antenna

I used to test cheap GPS antennas with the network analyzer, using a bias-tee to feed 5V power to the antenna and to avoid damaging the VNA RF input (even if the RF input is 50V tolerant). On Sat, Aug 21, 2021 at 6:14 PM Dana Whitlow wrote: > > I love Dan's idea, with one caveat. The

[time-nuts] Measuring the Thermodynamic Cost of Timekeeping

the full article is available related:

[time-nuts] Re: Long term ADEV of 5071

Maybe HP5071s will get their ADEV when optical clocks will officially rule... On Fri, Mar 26, 2021 at 9:40 AM Magnus Danielson wrote: > > Hi, > > On 2021-03-25 19:21, Poul-Henning Kamp wrote: > > > > Attila Kinali writes: > > > >> Does someone of those who own a 5071 have long-term ADEV

Re: [time-nuts] Old Crystal.

This (see jpeg picture) crystal from Morion seems to have a Q of 1147576, as measured on a Saunders 150B. Youtube video of the 150B in action: Parameters from the 150B: Holder, Cs (pF), Ct (pF), Fs (MHz), Fp (MHz), Rm, C0 (pF),Cm (pF), Lm (uH), Qu Glass,

Re: [time-nuts] 20th year of time nuts mailing list

Thank you all and happy new year. I joined this list in 2010, my first GPSDO was completed in 2001 when working on DVB transmission equipment here in Italy, at that time among the very first digital video modulators produced. Precise timing was entering the digital video broadcast industry. On

Re: [time-nuts] OSA Oscilloquartz model 8612 #OCXO

See this old discussion (8 years ago) about how to set a counter to measure the stability of a high quality OCXO (the OSA8612 could be a custom version of the Oscilloquartz BVA OSA8602). On Thu, Nov 19, 2020 at

Re: [time-nuts] PM6681 PROMs v109

The 3V cell is a BR2032 190mAh 20x3.2 [mm] (page 7-8 of the service manual). On Sat, Nov 14, 2020 at 12:11 AM ew via time-nuts wrote: > > Having contacted several time nuts off list to cut down traffic but no > response will some one tell me the battery number covered and number of > cells

Re: [time-nuts] Frequency Counter Choice

and relatively easy to do. > >> > >> Would you loose this calibration, through a little GPIB commands one can > >> write a fake value in. This will however not produce the best resu. The > >> calibration routine actually runs an off beat frequency and then te

Re: [time-nuts] "When you google word ..."

Was the blueshift only ever tested by using atomic clocks? OK, OCXOs alone are not stable enough to try and we can't go that far from our planet with the necessary equipment. On Fri, Oct 30, 2020 at 2:27 PM Bob kb8tq wrote: > > Hi > > So there might be a reason (other than NIST) to believe that

Re: [time-nuts] Frequency Counter Choice

For those who have the PM6681 (aka CNT81): check the 3V memory backup cell and replace it before the dreaded calibration lost (CAL LOST) will appear on the LCD. Replace the coin cell with great care (with the counter powered up), see the service manual for the procedure.

Re: [time-nuts] FE-5680A Comm question!

The Hyperterminal cannot send the 00, even if you can send the 2D using alt-45 and so on, the 00 is the problem. You can try the "terminal" by Bray that can send the 00, it can receive in HEX and other things. Another RS232 utility is the Hercules 3.2.8

Re: [time-nuts] Power glitch - Sat morning

It helps to have a digitizer on the line, a 'scope to sample the line, say, 20 seconds before and 20 second after a glitch. This way you can surely tell what happened without any speculation. There are a number of ready made digitizers (red-pitaya, digilent analog discovery, ...) if you don't want

Re: [time-nuts] Mains frequency data for Europe

The entsoe.eu site is full of 404... the only site I can find with frequency data is this (for the Belgian grid): What happened to the grid frequency in Europe in Jan 2019 and Apr 2019:

Re: [time-nuts] Is 5061A by itself a primary reference? Was: Modern Rb atomic reference vs classic Cs

The paper "Compact High-Performance Continuous-Wave Double-Resonance Rubidium Standard With 1.4 × 10−13 τ −1/2 Stability" can be found here: On Thu, Mar 19, 2020 at 11:26 AM Attila

[time-nuts] Scientific American: Time has no meaning at the north pole

A little side trip: ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com

Re: [time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

Reference on high quality crystal oscillators: On Fri, Feb 28, 2020 at 11:35 AM Attila Kinali wrote: > > On Thu, 27 Feb 2020 08:45:16 -0800 > "Richard (Rick) Karlquist" wrote: > > > OTOH, you could build a simple Colpitts > >

Re: [time-nuts] 5.115 MHz / 10.23 MHz wanted

krystaly.cz hosts also a collection of crystal oscillators' and oven controllers' schematics: On Wed, Feb 26, 2020 at 10:37 AM Clint Jay via time-nuts wrote: > > I have seen 10.23 parts somewhere but can't remember the

Re: [time-nuts] Frequency standards for different tau in Allen Dev measurement

This is exactly why we have disciplined oscillators: the short term stability of an OCXO steered with the long term stable accuracy of GNSS, Cs beam/fountain or H maser. On Thu, Feb 20, 2020 at 7:41 PM Taka Kamiya via time-nuts wrote: > > I have a question concerning frequency standard and their

Re: [time-nuts] Microstepper

Something like this? (see image) On Wed, Dec 25, 2019 at 1:02 AM Magnus Danielson wrote: > > Hi, > > I realize that I lack a microstepper. Consider that I have a stable and > low-noise 5 or 10 MHz but I want to resynthesize to correct frequency > and do phase-steps, and doing so without too much

Re: [time-nuts] Trimble Tbolt temperature

'The temperature chip is there to “learn” the TC of the unit while it is in lock.' I think this is news for the group: as of my knowledge, we don't know if the 1620 has an active role in the TBolt other than measuring temperature for the TSIP output. On Wed, Dec 4, 2019 at 4:04 PM Bob kb8tq

Re: [time-nuts] 100 MHz decade Divider II

In my opinion, those PLLs should be made unusually fast to have a fast response from input to output. There is also the EFC low pass response of the OCXOs. On Sun, Dec 1, 2019 at 7:01 AM Perry Sandeen via time-nuts wrote: > > Yo Bubba Dudes!, > Thanks to all who replied. > Gerhard, besides

Re: [time-nuts] John Fluke test equipment tutorial

r. > Some of the devices are obvious in function others are not so clear. But > still a good read. > Regards > Paul > > On Tue, Nov 26, 2019 at 3:30 AM Azelio Boriani > wrote: > > > It is available here: > > <https://archive.org/details/Calibration-Philosoph

Re: [time-nuts] John Fluke test equipment tutorial

It is available here: This is the first edition (1980) and is almost completely out of date regarding current metrology techniques. The time and frequency chapter (17) is only 5 pages long and dedicated to the time transfer using the

Re: [time-nuts] Two types of GPDSO / Rubidium

Maybe that "GPS tamed" is literally translated from chinese for "GPS disciplined". It is indeed the disciplining that gives personality to the GPSDO. You can PLLize the OCXO's 10MHz or the PPS derived from the OCXO's 10MHz and see different results on the 10MHz's stability and accuracy. It seems

Re: [time-nuts] Galleleo status ??

The status is now usable: On Mon, Jul 22, 2019 at 3:01 PM David Slipper wrote: > > > Is the Galileo system still out of service ?? > > It's been down (for me at least) for some time. > > Regards, > > Dave > > >

Re: [time-nuts] Sawtooth correction

>From the block diagram of the TM3-02 I can say that it is like the TBolt, it has the disciplined oscillator in the receive chain so no need to correct for the sawtooth. On Thu, Jul 11, 2019 at 7:14 AM Jerry via time-nuts wrote: > > Recent postings on 'sawtooth' hardware correction; several

Re: [time-nuts] Used Hydrogen Maser

Tom Van Baak said on Aug 29, 2013: >The pursuit of precision tends to be exponential rather than linear. ... >As a rough example in the ADEV world: >- for 1e-11, you can buy almost any XO, TCXO, or risky OCXO for $10. >- for 1e-12, you can find a reputable OCXO on eBay for under $100. >- for

Re: [time-nuts] Truetime XLi sat signal levels (dBW to dBc/SNR conversion question)

According to this reference the minimum received power on Earth should be -158.50dBW. According to this XLi manual the expected antenna gain should be between 20 to 36dB, so the reported received signal should

[time-nuts] WWV's 100-year Anniversary

The NIST WWV will be celebrating its 100-year anniversary in October 2019. The oldest continuously operating radio station in the world. There will be also a special event amateur radio station (WW0WWV)

Re: [time-nuts] Do GPS augmentation services improve 1pps?

When the PPS is generated by the internal free running oscillator, there is nothing to do: the sawtooth correction must be considered. The augmentation service will provide a better sawtooth estimate and a better position estimate as well. On Mon, Apr 15, 2019 at 4:00 AM Skip Withrow wrote: > >

Re: [time-nuts] Correcting measured PPS values with receiver sawtooth correction values

Why "virtually" and not exactly identical? Maybe the answer is in the details... On Sat, Feb 16, 2019 at 12:01 AM Mark Sims wrote: > > I am adding the ability to Lady Heather to apply receiver sawtooth correction > values to measured PPS values... this requires having a receiver that outputs >

Re: [time-nuts] Phase noise comparison between mini GPS clock and Chinese BG7TBL GPSDO

Sorry, the phase noise comes from the Si5328 in the GPSDO, not from the TCXO. On Mon, Dec 24, 2018 at 12:26 AM Azelio Boriani wrote: > > A very good TCXO, it is better than the OCXO in the BG7TBL and the > HP3048 is better than the E4406 at measuring phase noise: > <http://www.leo

Re: [time-nuts] Phase noise comparison between mini GPS clock and Chinese BG7TBL GPSDO

A very good TCXO, it is better than the OCXO in the BG7TBL and the HP3048 is better than the E4406 at measuring phase noise: The HP3048/Wenzel seems a little better than the TImepod 5330:

Re: [time-nuts] Need recommendation for GPS antenna for Oncore GPS module

This antenna is manufactured by Huber, you can find the complete manual here (find it in the pictures of the item): On Mon, Nov 5, 2018 at 6:33 PM Gregory Beat via time-nuts wrote: > > About 18 months

Re: [time-nuts] Frequency over fiber (was WWV and legal issues)

Why should there be a variation in the fiber's delay across an active fault line? The fiber could only break at the fault line, lay down more fiber than needed, to compensate the movement, and the delay doesn't change. On Sun, Sep 2, 2018 at 4:51 PM Bob kb8tq wrote: > > Hi > > Tidal effects can

Re: [time-nuts] NIST

Maybe this one is equivalent? On Fri, Aug 31, 2018 at 4:55 PM Attila Kinali wrote: > > On Thu, 30 Aug 2018 18:54:17 -0700 > Brooke Clarke wrote: > > > I wonder if anyone has tried using a small parabolic dish, like used for > > Free To

Re: [time-nuts] 1PPS for the beginner

Direct link to the TOW time 2017: On Fri, Aug 17, 2018 at 12:41 PM ew via time-nuts wrote: > > Tom > go back many times to the two editions I have. Very informative. Tried the > link no luck. Are there updated editions? > Thanks again > Bert

Re: [time-nuts] 1PPS for the beginner

For a definition of hanging bridge in the GPS receiver's context see: On Tue, Aug 14, 2018 at 2:58 PM jimlux wrote: > > On 8/14/18 12:29 AM, Mike Cook wrote: > > >> Le 14 août 2018 à 04:29, Chris Caudle a écrit : > >> > >> On Mon, August 13,

Re: [time-nuts] 1PPS for the beginner

Hanging bridges out of a GPSDO's PPS? Interesting... time to try to setup a measurement and see the relation between the GPS's PPS hanging bridges and the corresponding DO's ones. On Tue, Aug 14, 2018 at 9:55 AM Mike Cook wrote: > > > > Le 14 août 2018 à 09:29, Mike Cook a écrit : > > > > Sorry

Re: [time-nuts] Setting Time on WSPR Radio Transmitter

Is time.is not accurate or your desktop's clock? Try https://uhr.ptb.de On Fri, Jun 22, 2018 at 6:58 PM Brooke Clarke wrote: > > Hi: > > I'm experimenting with a WSPR beacon transmitter and part of how it works > depends on pushing the start button at exactly > 2 seconds past the minute. >