Re: [time-nuts] TU30 jump second

Hi Bob & Bo, This was discussed a long time ago on      http://www.gpskit.nl/forum/ which is defunced since many years. To measure the delay I suggest setting it up as a NMEA refclock to ntpd. But fudge it so that it is only collecting data to watch and log the offsets. IIRC delays for the

Re: [time-nuts] TU30 jump second

Hi, On 04/04/2017 05:47 PM, Bob kb8tq wrote: Hi On Apr 4, 2017, at 10:01 AM, Bo Hansen wrote: Hi all The data can be a bit hard to read in an email. So I will give it another try. PC-time | Diff. | GPS-time | Diff. ... 011606.005 | 0.992 | 011604 |1 011607.013 |

Re: [time-nuts] TAPR TICC boxed (input protection)

Low current measurements take a lot of time on the automatic test equipment and time in this case is measured in seconds. The same applies to low frequency noise. For an example, take a look at the National (now TI) LMC6001 and LMC6081: https://goo.gl/LCY2vR Unlike National, TI does not care

[time-nuts] Cesium oven and filament PIX

Attached is a PIX showing (CW from top left) the: >ionizer filament >Oven filaments (STD oven) >standard oven assy >high perm oven assy The HiPerf oven filament is the sealed spiral wound tube on the face of the oven. The posts on the top edge of the ovens is the connection to burn a hole in

[time-nuts] TICC resolution...

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Re: [time-nuts] HP-59309A Clock counts only seconds

Also, you might install a high quality machined pin socket. Save the non-replaceable PC board. - Original Message - From: "David C. Partridge" To: "'Discussion of precise time and frequency measurement'" Sent: Monday, April 03,

Re: [time-nuts] GPS first LO need to be locked?

Dave, I was able to find [2] here: http://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Akos_IONGPS_2003_3FreqRX.pdf [3] was harder, and I don't have a link but a google search for the title in quotes got me a link on semanticscholar that let me download the PDF. Interesting stuff! Hope

[time-nuts] Sinlge ADC multi-band receiver (was: GPS first LO need to be locked?)

On Tue, 4 Apr 2017 06:55:24 -0700 jimlux wrote: > So those folks were trying to use 1 ADC for all three bands, so they had > to choose a sampling rate that lets them separate the signals later in > software. > > But that ADC is a MAX104 - a 1GSPS, 8 bit converter -

Re: [time-nuts] The ultraAtomic clock for home

On 4/4/2017 3:19 PM, Bob kb8tq wrote: Hi Based on their web site, the model you saw is the one and only version that does the new modulation. One very useful feature is the ability to set it to any time zone world wide. I guess I missed the note on the WWVB coverage area expanding to cover

Re: [time-nuts] Sinlge ADC multi-band receiver

On 4/4/17 4:21 PM, Attila Kinali wrote: On Tue, 4 Apr 2017 06:55:24 -0700 jimlux wrote: So those folks were trying to use 1 ADC for all three bands, so they had to choose a sampling rate that lets them separate the signals later in software. But that ADC is a MAX104 -

[time-nuts] Fwd: HP5061B Peak to Valley Ratios

https://www.febo.com/pipermail/time-nuts/2017-April/104600.html Here is the plot on the Zeeman frequency data that we gathered this morning. It is close to Figure 4-43 (page 4-31) in the service manual for the HP5061B. Thanks to Jonathon for plotting this.

Re: [time-nuts] TAPR TICC boxed (input protection)

A protection diode needs to also have a fast turn on with little or no overshoot of the forward voltage. Reverse recovery time can be an issue if one is relying on the clamp for protection against a periodic overload such as when an input is overdriven by a sinewave input and one wishes to

Re: [time-nuts] TICC resolution...

Hi Wojciech, Thanks for sharing your TICC plot. Yes, the periodic peaks show the ~55 ps quantization, which is the limiting factor of the TICC's single-shot resolution. The TICC is based on the TDC7200 Time-to-Digital Converter (TDC) chip, which uses a digital ring oscillator, which a mobius

[time-nuts] The ultraAtomic clock for home

I was in a walmart the other day and noticed that there were numbers of atomic clocks. Thought the fad had died off due to lots of reasons. I was curious did those magical supa-dupa atomic clocks that screwed the old phase tracking receivers ever arrive? Son of a gun they did. I must have missed

Re: [time-nuts] The ultraAtomic clock for home

Hi Based on their web site, the model you saw is the one and only version that does the new modulation. One very useful feature is the ability to set it to any time zone world wide. I guess I missed the note on the WWVB coverage area expanding to cover the entire planet …..:) Bob > On Apr 4,

Re: [time-nuts] The ultraAtomic clock for home

In message , paul swed writes: >I suspect if there is one of these some other vendors and even perhaps La >Crosse may have other models at a lower cost. Will not comment on the >technical quality of these products.

Re: [time-nuts] The ultraAtomic clock for home

I have been happy with the Casio Waveceptor watches. They can display UTC. They seem to reliably set themselves between midnight and 3AM each morning when I'm wearing them here in Maryland, more reliably than the (non-PSK) WWVB wall clocks. The Casio WV58A-1AVCR is a plastic LCD watch for $28

[time-nuts] TU30 jump second

Lady Heather can work with the Jupiter receivers in either NMEA or Zodiac (binary) mode. Heather checks time stamps for consistency and flags any that are out of sequence. I usually run it in binary mode. It's been a while since I ran mine, but I don't remember ever seeing any skips. The

Re: [time-nuts] HP-59309A Clock counts only seconds

Thanks, everyone, for your inputs. I've ordered some NOS 4011s (made by National Semi, mildly ironic since I used to work there) and some supposedly round pin sockets (the reviews were mixed—some folks got good stuff, some got junk). I'll update the thread once I have everything here and

Re: [time-nuts] TAPR TICC boxed (input protection)

On Wed, 5 Apr 2017 09:13:34 +1200 (NZST), you wrote: >A protection diode needs to also have a fast turn on with little or no >overshoot of the forward voltage. That would be ideal but forward turn on time is rarely specified and usually assumed to be fast and some fast diodes have appallingly

Re: [time-nuts] TICC resolution...

Tom, Thanks for your comments - the plot was really a quick example only. Yes, I am aware of the TDC7200 method of operation, all I meant to say was that the 55 ps clusters can be clearly seen, and I was expecting the jitter to blur the lines somewhat more. It was a combination of a histogram

Re: [time-nuts] The ultraAtomic clock for home

I have had a Stauer Titanium Atomic wristwatch for 6 years. Never had a problem. Never have had to set it. Still on the original battery. Automatic DST. Analog dial for hours and minutes... digital display for seconds and month/date. It is always in step with WWV... ;-) 73 Don W4WJ

Re: [time-nuts] The ultraAtomic clock for home

Paul, et al, 1) The La Crosse 1235UA does indeed receive the new WWVB PSK format. It was first brought to our attention by Brooke Clarke some months ago: https://www.febo.com/pipermail/time-nuts/2016-November/101885.html Prices vary from affordable to lets-see-how-much-we-can-charge, depending

Re: [time-nuts] Line Frequeny Stablity

Thanks for the info. So that tells me how data is recorded - but not how the frequency is kept stable ? Is the line frequency now directly tied to GPS clock - with no drift ? Thomas D. Erb t...@electrictime.com / Electric Time Company, Inc. Office: 508-359-4396 x

[time-nuts] HP5061B Peak to Valley Ratios

https://www.febo.com/pipermail/time-nuts/2017-April/104600.html We did our first Zeeman frequency test on our good cesium 05061-6077 Tube with a 1 Meg scope probe and a 11 Meg Digital Voltmeter in parallel. KB7APQ used his digital generator for the variable frequency. See paragraph 3-16 on page

[time-nuts] HP-59309A Clock counts only seconds

I have dozens of thingies with 4000 series CMOS in them. Yes, chips can fail regardless of the logic family type. I have not noticed anything particularly bad about 4000 series. In fact, I have seldom needed to replace any. ___ time-nuts mailing

Re: [time-nuts] TAPR TICC boxed

http://www.spacetechexpo.eu/assets/files/2015/Recent-Developments-in-Phase-Stable-Cables.pdf is a more readily accessible source of data on coax cable delay tempco et. Bruce > > On 04 April 2017 at 00:13 Bruce Griffiths > wrote: > > Copper jacketed low

[time-nuts] TU30 jump second

Hi List Like many of you I also use a Navman Jupiter TU30 in a GPSDO. Besides the 10 kHz used for the PLL I also have a display showing time. But since a couple of years, Jan 15?, the time sometimes jumps -1 s and and then later returns by jumping +1 s Please see an example of the latter

[time-nuts] oscillator data wanted

Unit in question is a CTS Knights 970-4302-1 on 10 MHz. (Has an HP part no. as well, 1813- 0835-1). Any data out there? Only draws ~ 15mA from a 12 volt supply so it's not an OCXO? DaveB, NZ ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] TU30 jump second

Hi The odd behavior is seen in NMEA mode. I have not tried in binary mode. Bo ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] TU30 jump second

Hi Welcome to the ever growing list of people with buggy GPS modules. One thing that makes this stuff tough to track down is the firmware. A lot of these parts went out with various revs of the standard firmware. Some of them went out with specific customized versions of the firmware. Since

Re: [time-nuts] TU30 jump second

Hi Bo, Are you getting data in binary format [1] or NMEA? The NMEA mode for some Jupiter receivers are known to behave badly in NMEA-mode. The delay would go from 1:ish to 2:ish seconds depending on signal processing load. -- Björn [1] Navman/Jupiter/Conexant/Zodiac/Rockwell binary...

Re: [time-nuts] GPS first LO need to be locked?

On 4/3/17 9:32 PM, Logan Cummings wrote: Dave, I was able to find [2] here: http://web.stanford.edu/group/scpnt/gpslab/pubs/papers/Akos_IONGPS_2003_3FreqRX.pdf So those folks were trying to use 1 ADC for all three bands, so they had to choose a sampling rate that lets them separate the

Re: [time-nuts] Conversion of Stanford PRS10 to RS-232 Communication

Many thanks for the steer. I was getting hung up on the reference to jumpers. I'll order the 240R and 3K9 SMD resistors (per the Rev H parts list) and see how it goes. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Line Frequeny Stablity

I was wondering if anyone knew how the US power grids control their line frequency with respect to time ? There seems to be four separate grids - Eastern, Texas, Western and Quebec - but I have no idea how they get their time. Thomas D. Erb

Re: [time-nuts] TU30 jump second

Hi all The data can be a bit hard to read in an email. So I will give it another try. PC-time | Diff. | GPS-time | Diff. ... 011606.005 | 0.992 | 011604 |1 011607.013 | 1.008 | 011605 |1 011608.005 | 0.992 | 011607 |2 <--- The issue 011609.013 | 1.008 | 011608 |1 011610.004 | 0.991 | 011609 |1

Re: [time-nuts] GPS first LO need to be locked?

Perhaps someone could start a new thread with a different title since this has evolved to something else then my request. By the way the response to my question was answered by the group and its true the first LO does not need to be locked for at least code tracking. I really didn't prove its

Re: [time-nuts] Line Frequeny Stablity

Hi, It's based on UTC, as derived from GPS. I think you will find the following NASPI report of interest: https://www.naspi.org/node/608 You will find maps over the regions too! While NASPI is PMU/synchro-phasor focused, older equipment use GPS too for phase capture. Cheers, Magnus On

Re: [time-nuts] TU30 jump second

Hi > On Apr 4, 2017, at 10:01 AM, Bo Hansen wrote: > > Hi all > > The data can be a bit hard to read in an email. So I will give it another try. > > PC-time | Diff. | GPS-time | Diff. > ... > 011606.005 | 0.992 | 011604 |1 > 011607.013 | 1.008 | 011605 |1 > 011608.005 |

Re: [time-nuts] The ultraAtomic clock for home

Really can't say that its c-max or not. Since if you try to download anything from the sight the links are dead. But I do believe its the true wwvb bpsk decoder. If it is the cme 8000 that chip works impressively well even in New England. But this is the first time I have stumbled across anything