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

2017-10-05 Thread Lars Walenius
I guess it could be zero usable satellites every day at about 8am for several days. Lars Från: Skip Withrow<mailto:skip.with...@gmail.com> Skickat: den 4 oktober 2017 03:17 Till: time-nuts<mailto:time-nuts@febo.com> Ämne: [time-nuts] Weird GPSDO behavior - update Hello Time-Nu

[time-nuts] Weird GPSDO behavior - update

2017-10-04 Thread Mark Sims
There is apparently a way to update the Tbolt firmware. Several years ago a Chinese seller of Tbolts was selling units that he upgraded the firmware from v2.xx to v3.xx He may have pulled a new firmware chip and dumped the image and re-programmed the older ones externally or used JTAG,

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

2017-10-04 Thread Tim Shoppa
Is there a way you can force your currently disciplined oscillator to free-run, and log the phase difference between oscillator and GPS over a couple of days? Tim N3QE On Tue, Oct 3, 2017 at 2:15 PM, Skip Withrow wrote: > Hello Time-Nuts, > > Well, I think I know a

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

2017-10-04 Thread Azelio Boriani
19:15 (GMT+00:00) To: time-nuts <time-nuts@febo.com> > Subject: [time-nuts] Weird GPSDO behavior - update > Hello Time-Nuts, > > Well, I think I know a little more about my GPSDO problem, but > probably have more questions now than before. Thanks for all the > replies to

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

2017-10-04 Thread robkimberley
time-nuts@febo.com> Subject: [time-nuts] Weird GPSDO behavior - update Hello Time-Nuts, Well, I think I know a little more about my GPSDO problem, but probably have more questions now than before.  Thanks for all the replies to the first post with thoughts and suggestions. I first tried res

[time-nuts] Weird GPSDO behavior - update

2017-10-03 Thread Skip Withrow
Hello Time-Nuts, Well, I think I know a little more about my GPSDO problem, but probably have more questions now than before. Thanks for all the replies to the first post with thoughts and suggestions. I first tried restarting Lady Heather and doing a cold boot on the NTGS50AA (then entering

Re: [time-nuts] Weird GPSDO behavior

2017-10-01 Thread Lars Walenius
den 28 september 2017 22:25 To: time-nuts<mailto:time-nuts@febo.com> Subject: [time-nuts] Weird GPSDO behavior Hello Time-Nuts, I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt) with the OCXO removed and a SRS PRS-10 rubidium oscillator in its place. I have been running

[time-nuts] Weird GPSDO behavior

2017-09-30 Thread Mark Sims
A couple of things to try... Turn on the OSC plot (G O) and see what that looks like... usually like a lot of noise. Try with the display filter turned on (like F D 60). The "&" menu lets you set the disciplining parameters. It will also bring up a display of all the parameters. You can

Re: [time-nuts] Weird GPSDO behavior

2017-09-30 Thread Lars Walenius
den 28 september 2017 22:25 Till: time-nuts<mailto:time-nuts@febo.com> Ämne: [time-nuts] Weird GPSDO behavior Hello Time-Nuts, I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt) with the OCXO removed and a SRS PRS-10 rubidium oscillator in its place. I have been running

Re: [time-nuts] Weird GPSDO behavior

2017-09-30 Thread Charles Steinmetz
Skip wrote: I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt) with the OCXO removed and a SRS PRS-10 rubidium oscillator in its place. Once per day (about 8am) something disturbs the system. So, the GPSDO spends much of its time recovering and never gives me anywhere near

Re: [time-nuts] Weird GPSDO behavior

2017-09-30 Thread John Hawkinson
I would have thought the easy test is to run the GPSDO on battery power (perhaps with a UPS). Maybe that's not so easy? --jh...@mit.edu John Hawkinson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Weird GPSDO behavior

2017-09-29 Thread Mark Sims
It's not anything causing a GPS / tracking outage... the sat count plot does not drop to 0. ___ 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

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Bob kb8tq
Hi If a simple GPS outage makes the GPSDO go bonkers, there is something else involved. Noise jamming or flying saucers over the antenna should just shut down the receiver. When it locks back up again, the disciplining should resume. If it goes into a death spiral that pretty strongly suggests

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread jimlux
On 9/29/17 6:13 AM, Rob Kimberley wrote: I'd go with a power surge as it's so regular at 8AM. Rob Delivery truck with Jammer, as suggested by Graham also. There could be a RFI burst from something like a streetlight or storefront display turning on/off. Have you analyzed the timing of

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Didier Juges
erley" <robkimber...@btinternet.com> wrote: > I'd go with a power surge as it's so regular at 8AM. > Rob > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Skip > Withrow > Sent: 28 September 2017 21:18 > To: time-nuts >

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Bob Bownes
wer surge as it's so regular at 8AM. > Rob > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Skip > Withrow > Sent: 28 September 2017 21:18 > To: time-nuts > Subject: [time-nuts] Weird GPSDO behavior > > Hello Time-Nuts, &g

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Didier Juges
It makes me feel better (not good, just better) to know it's not just me... On Sep 29, 2017 7:19 AM, "Bob kb8tq" wrote: > Hi > > > > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > > > I suspect that it is either temperature related (the funkiness starts >

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Rob Kimberley
I'd go with a power surge as it's so regular at 8AM. Rob -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Skip Withrow Sent: 28 September 2017 21:18 To: time-nuts Subject: [time-nuts] Weird GPSDO behavior Hello Time-Nuts, I have a NTGS50AA GPSDO (close

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Graham / KE9H
Could be a delivery truck with a GPS jammer on it, that passes your location every morning at the same time. --- Graham == On Fri, Sep 29, 2017 at 7:18 AM, Bob kb8tq wrote: > Hi > > > > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > > > I suspect that it

Re: [time-nuts] Weird GPSDO behavior

2017-09-29 Thread Bob kb8tq
Hi > On Sep 28, 2017, at 6:59 PM, Mark Sims wrote: > > I suspect that it is either temperature related (the funkiness starts around > when the temperature reaches a minimum) or related to the way the > disciplining parameters are hacked to get the extended time constant.

[time-nuts] Weird GPSDO behavior

2017-09-29 Thread Mark Sims
I suspect that it is either temperature related (the funkiness starts around when the temperature reaches a minimum) or related to the way the disciplining parameters are hacked to get the extended time constant. Try setting up for say a 10,000 second time constant and see how things change.

[time-nuts] Weird GPSDO behavior

2017-09-28 Thread Skip Withrow
Hello Time-Nuts, I have a NTGS50AA GPSDO (close cousin to the NTBW50AA and Thunderbolt) with the OCXO removed and a SRS PRS-10 rubidium oscillator in its place. I have been running Lady Heather 5.0 and have changed the damping, gain, and time constant to give me a 20,000 second time constant