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

I also see terms like GPS tamed or PLL-GPS.  https://www.ebay.com/itm/1pcs-PLL-GPSDO-10M-GPS-tamed-clocks/263392170249?hash=item3d53659109:g:1p0AAOSwH3haNo7c https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR12.TRC2.A0.H0.Xgps-pll.TRS0&_nkw=gps-pll&_sacat=0 It is not at all c

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

Hi The first gotcah is that the distinction is not very clear. A TBolt varies the frequency of the OCXO in the GPSDO. GPSDO’s that use Rb’s can and often do vary the frequency. Indeed some devices use a DDS to generate an output rather than varying something else. I suspect that is what you

Re: [time-nuts] Am I doing something wrong?

Hi The steering on the TBolt comes from code phase measurements on the incoming GPS signals. The pps is derived directly from the 10 MHz by division. Since the OCXO is phase locked to the GPS, the PPS follows along. Indeed they have the usual “reset the counter” stuff when things are big time o

Re: [time-nuts] Am I doing something wrong?

Roger, Bob's idea is a good one. Your last Oct screen shot shows DAC=+0.475V. Try setting DAC=+0.5V. Don't even need a counter since L H shows osc error. Hope that DAC does not hit a rail. If this does achieve a steering lock then be sure to set the DAC initial value using & >> I. This wi

[time-nuts] Two types of GPDSO / Rubidium

This is a cross post from EEVBLOG.  I'm hoping there is someone who's familiar with this subject would help me out here. I am hoping someone can help me understand this.  I've seen similar discussions take place both for GPSDO with Crystal Oscillators and Rubidium modules.  It appears there are

[time-nuts] Fwd: [New post] 100 Year Old Atomic Clock

fyi, Don Original Message SUBJECT: [New post] 100 Year Old Atomic Clock DATE: 2019-09-25 11:03 FROM: Hackaday TO: d...@montana.com Gregory L

Re: [time-nuts] Precision Time Protocol – Windows 10 implementation

On Wed, Sep 25, 2019 at 8:01 PM David J Taylor via time-nuts < time-nuts@lists.febo.com> wrote: > From: Adam Kumiszcza > > Hi again! > > My raspi is now in a new location. The GPS signal is fine, the window is > not south-facing, but the antenna is outside the window attached to a metal > windowsi

Re: [time-nuts] Am I doing something wrong?

I am not sure, but I belive that DAC steering may be derived from GPS PPS compared to osc derived PPS signal. There may be a component failure blocking the PPS signal(s). Is there a pulse on the PPS output port? There is no documentation of the hardware available On Wed, 25 Sep 2019 12:20:

Re: [time-nuts] Am I doing something wrong?

Hi Best guess is that the OCXO is too far off frequency for the GPSDO to even try to lock. Quick check would be to run the DAC manually while watching the output with a counter. It should tune +/- 10 Hz or so either side of 10 MHz. As far as anybody knows, there are no official TBolt schemati

Re: [time-nuts] NTP apps on Windows question

On Tue, Sep 24, 2019 at 6:01 PM Chris Burford wrote: > > Yes, > > You want to disable Windows Time service (w32time) if running the client > from Meinberg. If you scroll down about 1/3 from the top of this > document you will see where it > makes mention to

[time-nuts] Am I doing something wrong?

Something certainly seems a bit odd here. The LH plot shows the device reporting itself as a Nortel NTGS/NTBW, even though also indicating a Tbolt log file,  so if it really is a Thunderbolt are you forcing it at start up to run as a Nortel unit? It's also showing zero DAC voltage and that's not

Re: [time-nuts] Am I doing something wrong?

Thanks to Bill and Mike for the very helpful info! Unfortunately, doing warm reset, cold reset, factory reset, multiple self surveys did not solve the problem. Forcing Disciplining to Enabled did not help. Tuning the oscillator did not help. I can manually control the DAC voltage using appropri

Re: [time-nuts] Precision Time Protocol – Windows 10 implementation

From: Adam Kumiszcza Hi again! My raspi is now in a new location. The GPS signal is fine, the window is not south-facing, but the antenna is outside the window attached to a metal windowsill, and there are no buildings nearby. I'm coming back to the idea of distributing PPS signal. Do you think

Re: [time-nuts] NTP apps on Windows question

From: Chris Wilson I have used Meinberg NTP and also Thinking Man's Dimension 4 as NTP applications on Windows 7 64 bit OS's on 3 PC's. I use them to sync the PC time for WSJT-X WSPR (a low power digital amateur radio mode) which requires an accurate time on the PC's for successful decoding and t

[time-nuts] Fwd: Z3816A repair or purchase

HP Z3801A / Z3861A Resource & Documentation Page (K8CU) https://www.realhamradio.com/GPS_Frequency_Standard.htm Bill Jones, K8CU has a deducated web page for the HP 3861A Receiver. https://www.realhamradio.com/GPS_Z3816A_Receiver.htm What LEDs are Lighted on the Z3861A Front Panel? Power, Alarm,

Re: [time-nuts] Precision Time Protocol – Windows 10 implementation

On Thu, Aug 8, 2019 at 7:00 PM David J Taylor via time-nuts < time-nuts@lists.febo.com> wrote: > Hi everybody! My first post here, I hope the subject is adequate for this > mailing list. > > I'm using a tiny layer 1 NTP server consisting of Raspberry Pi 3B+ with > Ublox MAX-M8Q expansion board pro

Re: [time-nuts] NTP apps on Windows question

Chris Wilson wrote: > I have used Meinberg NTP ... It's important to keep in mind that the NTP software for Windows has not been written by Meinberg. It's just the reference implementation of the NTP protocol provided by the NTP project at http://www.ntp.org Releases are normally available as sou

Re: [time-nuts] NTP apps on Windows question

Paul Theodoropoulos via time-nuts wrote: > Only tangentially related, but for keeping a Windows PC synced, I'm > rather partial to NetTime. It's a tiny tray app, quite flexible, and > otherwise unobtrusive.  It's a freeware app, though donations are > accepted > > http://www.timesynctool.com/

Re: [time-nuts] Z3816A repair or purchase

Here is some info I found on a personal website, thought it might help. http://telechron.com/hp_gps/hp.html Don Resor Sent from someone's iPhone > On Sep 25, 2019, at 12:15 AM, Robert Melville wrote: > > Z3816A ___ time-nuts mailing list -- time-n